Biggest changeIn addition, we had an increase of $127.0 million in accounts receivables due to increased product and service billings. These cash outflows were largely offset by a $278.5 million increase in deferred revenue reflecting ongoing growth in PCS contracts and increased product deferred revenue related to contracts with acceptance terms.
Biggest changeThese cash outflows were largely offset by a $465.0 million increase in deferred revenue driven by a growth in PCS contracts and increased product deferred revenue related to customer contracts with acceptance terms, a $322.3 million increase in accounts payable and other liabilities related to significant business volume, timing of payments, and increased supplier and contract manufacturer liability reserves and a $20.2 million increase in income taxes, net, due to timing of payments.
For further information regarding income taxes and the impact on our results of operations and financial position, refer to Note 8. Income Taxes of the Notes to Consolidated Financial Statements included in Part II, Item 8, of this Annual Report on Form 10-K.
For further information regarding income taxes and the impact on our results of operations and financial position, refer to Note 8. Income Taxes of the Notes to Consolidated Financial Statements included in Part II, Item 8, of this Annual Report on Form 10-K.
Our future capital requirements will depend on many factors, including our growth rate, the timing and extent of our spending to support research and development activities, the timing and cost of establishing additional sales and marketing capabilities, the introduction of new and enhanced product and service offerings, our costs associated with supply chain activities, including access to outsourced manufacturing, our costs related to investing in or acquiring complementary or strategic businesses and technologies, the continued market acceptance of our products, and stock repurchases.
Our future capital requirements will depend on many factors, including our growth rate, the timing and extent of our spending to support research and development activities, the timing and cost of establishing additional sales and marketing capabilities, the introduction of new and enhanced product and service offerings, our costs associated with supply chain activities, including access to outsourced manufacturing, our costs related to investing in or acquiring complementary or strategic businesses and technologies, the continued market acceptance of our products, capital expenditures and stock repurchases.
We record a liability and a corresponding charge for non-cancellable, non-returnable purchase commitments with our contract manufacturers or suppliers for quantities in excess of our demand forecasts or that are considered obsolete due to manufacturing and engineering change orders resulting from design changes. We use significant judgment in establishing our forecasts of future demand and obsolete material exposures.
We record a liability and a corresponding charge for non-cancellable, non-returnable purchase commitments with our contract manufacturers or suppliers for quantities in excess of our demand forecasts or that are considered obsolete due to manufacturing and engineering change orders resulting from design changes. 64 We use significant judgment in establishing our forecasts of future demand and obsolete material exposures.
Our future success is dependent upon our ability to continue to evolve and adapt to our rapidly changing environment. We must also continue to develop market-leading products and features that address the needs of our existing and new customers, and increase sales in the enterprise data center switching, and campus workspace markets.
Our future success is dependent upon our ability to continue to evolve and adapt to our rapidly changing environment. We must also continue to develop 54 market-leading products and features that address the needs of our existing and new customers, and increase sales in the enterprise data center switching, and campus workspace markets.
The decrease was primarily driven by an increased proportion of our sales to larger end customers who generally receive larger discounts, increased material and logistics costs, and increased excess/obsolete finished goods and component inventory charges, partly offset by the leverage of fixed overhead costs on a higher revenue base.
The decrease was primarily driven by an increased proportion of our sales to larger customers who generally receive larger discounts, increased material and logistics costs, and increased excess/obsolete finished goods and component inventory charges, partly offset by the leverage of fixed overhead costs on a higher revenue base.
We generate revenue primarily from sales of our switching and routing platforms, which incorporate our EOS software, and related network applications. We also generate revenue from post-contract support ("PCS"), which end customers typically purchase in conjunction with our products, and renewals of PCS. We sell our products through both our direct sales force and our channel partners.
We generate revenue primarily from sales of our switching and routing platforms, which incorporate our EOS software, and related network applications. We also generate revenue from post-contract support ("PCS"), which customers typically purchase in conjunction with our products, and renewals of PCS. We sell our products through both our direct sales force and our channel partners.
Operating Expenses (in thousands, except percentages) Our operating expenses consist of research and development, sales and marketing, and general and administrative expenses. The largest component of our operating expenses is personnel costs. Personnel costs consist of wages, benefits, bonuses and, with respect to sales and marketing expenses, sales commissions. Personnel costs also include stock-based compensation and travel expenses.
Operating Expenses (in thousands, except percentages) Our operating expenses consist of research and development, sales and marketing, and general and administrative expenses. The largest component of our operating expenses is personnel costs. Personnel costs consist of wages, benefits, bonuses and, with respect to sales and marketing expenses, sales commissions. Personnel costs also include stock-based compensation and travel-related expenses.
We intend to continue expanding our sales force and marketing activities in key geographies, as well as our relationships with channel, technology and system-level partners in order to reach new end customers more effectively, increase sales to existing customers, and provide services and support.
We intend to continue expanding our sales force and marketing activities in key geographies, as well as our relationships with channel, technology and system-level partners in order to reach new customers more effectively, increase sales to existing customers, and provide services and support.
Gross margin, or gross profit as a percentage of revenue, has been and will continue to be affected by a variety of factors, including pricing pressure on our products and services due to competition, the mix of sales to large end customers who generally receive lower pricing, the mix of products sold, manufacturing-related costs, including costs associated with supply chain sourcing activities, merchant silicon costs, and excess/obsolete inventory charges, including charges for excess/obsolete component inventory with our contract manufacturers and suppliers.
Gross margin, or gross profit as a percentage of revenue, has been and will continue to be affected by a variety of factors, including pricing pressure on our products and services due to competition, the mix of sales to large customers who generally receive lower pricing, the mix of products sold, manufacturing-related costs, including costs associated with supply chain sourcing activities, merchant silicon costs, and excess/obsolete inventory charges, including charges for excess/obsolete component inventory held by our contract manufacturers and suppliers.
Service revenue is primarily derived from sales of PCS contracts, which is typically purchased in conjunction with our products, and subsequent renewals of those contracts. We expect our revenue may vary from period to period based on, among other things, the timing, size, and complexity of orders, especially with respect to our large end customers.
Service revenue is primarily derived from sales of PCS contracts, which are typically purchased in conjunction with our products, and subsequent renewals of those contracts. We expect our revenue may vary from period to period based on, among other things, the timing, size, and complexity of orders, especially with respect to our large customers.
Off-balance sheet arrangements As of December 31, 2022, we did not have any relationships with any unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, that would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.
Off-balance sheet arrangements As of December 31, 2023, we did not have any relationships with any unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, that would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.
As a result of cost inflation in our supply chain, we implemented targeted price increases during the year, which began to benefit our revenue in late 2022. As supply chain costs improve, w e expect to return to a more competitive pricing environment for our products and services.
As a result of cost inflation in our supply chain, we implemented targeted price increases during the year, which began to benefit our revenue in late 2022. As supply chain costs improve, w e expected to return to a more competitive pricing environment for our products and services.
Historically, large purchases by a relatively limited number of end customers have accounted for a significant portion of our revenue.
Historically, large purchases by a relatively limited number of customers have accounted for a significant portion of our revenue.
Net non-cash adjustments primarily consisted of $230.9 million of stock-based compensation expenses and $62.7 million of depreciation, amortization and other expenses, which were largely offset by an increase in deferred income taxes of $244.4 million primarily resulting from increased deferred tax assets associated with the 57 Table of Contents capitalization of research and development costs under IRC Section 174.
Net non-cash adjustments primarily consisted of $230.9 million of stock-based compensation expenses and $62.7 million of depreciation, amortization and other expenses, which were largely offset by an increase in deferred income taxes of $244.4 million primarily resulting from increased deferred tax assets associated with the capitalization of research and development costs under IRC Section 174.
These estimates depend on our assessment of current and expected orders from our customers, product development plans and current sales levels. In addition, industry-wide supply chain shortages have resulted in extended lead times for components and have required us to extend the time horizon of our demand forecasts.
These estimates depend on our assessment of current and expected orders from our customers, product development plans and current sales levels. In addition, industry-wide supply chain shortages have resulted in extended lead times for components, and we were required to extend the time horizon of our demand forecasts.
If we do not have an observable SSP, such as when we do not sell a product or service separately, then SSP is estimated using judgment and considering all reasonably available information, such as market conditions and information about the size and/or purchase volume of the customer.
If we do not have an observable SSP, such as when we do not sell a product or service separately, then SSP is estimated using judgment and considering all reasonably available information, such as gross margin objectives, market conditions and information about the size and/or purchase volume of the customer.
We record a provision when inventory is determined to be in excess of anticipated demand, or obsolete, to adjust inventory to its estimated realizable value. 60 Table of Contents Our contract manufacturers procure components and assemble products on our behalf based on our forecasts.
We record a provision when inventory is determined to be in excess of anticipated demand, or obsolete, to adjust inventory to its estimated realizable value. Our contract manufacturers procure components and assemble products on our behalf based on our forecasts.
Recent Accounting Pronouncements Refer to the subheading titled “ Recently Adopted Accounting Pronouncements” in Note 1. Organization and Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements included in Part II, Item 8, of this Annual Report on Form 10-K. 61 Table of Contents
Recent Accounting Pronouncements Refer to the subheading titled “ Recently Adopted Accounting Pronouncements” in Note 1. Organization and Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements included in Part II, Item 8, of this Annual Report on Form 10-K. 65
During the year ended December 31, 2022, cash provided by investing activities was $216.3 million, consisting of proceeds of $1.6 billion from maturities of marketable securities, proceeds from the sale of marketable securities of $193.8 million, partially offset by purchases of available-for-sale securities of $1.4 billion, $145.1 million for business acquisitions, purchases of property, equipment and intangible assets of $44.6 million, and investments and notes receivable in private companies of $12.7 million.
During the year ended December 31, 2023, cash used in investing activities was $687.5 million, consisting of purchases of available-for-sale securities of $2.6 billion, and purchases of property, equipment and intangible assets of $34.4 million, partially offset by proceeds of $1.9 billion from maturities of marketable securities, and proceeds from the sale of marketable securities of $67.3 million, During the year ended December 31, 2022, cash provided by investing activities was $216.3 million, consisting of proceeds of $1.6 billion from maturities of marketable securities, proceeds from the sale of marketable securities of $193.8 million, partially offset by purchases of available-for-sale securities of $1.4 billion, $145.1 million for business acquisitions, purchases of property, equipment and intangible assets of $44.6 million, and investments and notes receivable in private companies of $12.7 million.
Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Other income (expense), net: Interest income $ 27,556 0.6 % $ 7,215 0.2 % $ 20,341 281.9 % Unrealized gain (loss) on equity investments 27,479 0.6 — — 27,479 100.0 Other income (expense), net (345) — (1,075) — 730 (67.9) Total other income, net $ 54,690 1.2 % $ 6,140 0.2 % $ 48,550 790.7 % The movement in other income (expense), net, during the year ended December 31, 2022 as compared to 2021 was driven by an increase in interest income due to higher interest rates.
Other Income, Net (in thousands, except percentages) Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Other income, net: Interest income $ 27,556 0.6 % $ 7,215 0.2 % $ 20,341 281.9 % Gain on investments in privately-held companies 27,479 0.6 — — 27,479 100.0 Other income (expense), net (345) — (1,075) — 730 (67.9) Total other income, net $ 54,690 1.2 % $ 6,140 0.2 % $ 48,550 790.7 % The movement in other income (expense), net, during the year ended December 31, 2022 as compared to 2021 was driven by an increase in interest income due to higher interest rates.
Results of Operations Year Ended December 31, 2022 Compared to Year Ended December 31, 2021 Revenue, Cost of Revenue and Gross Margin (in thousands, except percentages) 51 Table of Contents Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Revenue Product $ 3,716,079 84.8 % $ 2,377,727 80.7 % $ 1,338,352 56.3 % Service 665,231 15.2 570,310 19.3 94,921 16.6 Total revenue 4,381,310 100.0 2,948,037 100.0 1,433,273 48.6 Cost of revenue Product 1,573,629 35.9 958,363 32.5 615,266 64.2 Service 131,985 3.0 108,895 3.7 23,090 21.2 Total cost of revenue 1,705,614 38.9 1,067,258 36.2 638,356 59.8 Gross profit $ 2,675,696 61.1 % $ 1,880,779 63.8 % $ 794,917 42.3 % Gross margin 61.1 % 63.8 % Revenue by Geography (in thousands, except percentages) Year Ended December 31, 2022 % of Total 2021 % of Total Americas $ 3,462,621 79.0 % $ 2,156,183 73.2 % Europe, Middle East and Africa 529,800 12.1 486,836 16.5 Asia-Pacific 388,889 8.9 305,018 10.3 Total revenue $ 4,381,310 100.0 % $ 2,948,037 100.0 % Revenue Product revenue primarily consists of sales of our switching and routing products, and related network applications.
Year Ended December 31, 2022 Compared to Year Ended December 31, 2021 Revenue, Cost of Revenue and Gross Margin (in thousands, except percentages) Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Revenue Product $ 3,716,079 84.8 % $ 2,377,727 80.7 % $ 1,338,352 56.3 % Service 665,231 15.2 570,310 19.3 94,921 16.6 Total revenue 4,381,310 100.0 2,948,037 100.0 1,433,273 48.6 Cost of revenue Product 1,573,629 35.9 958,363 32.5 615,266 64.2 Service 131,985 3.0 108,895 3.7 23,090 21.2 Total cost of revenue 1,705,614 38.9 1,067,258 36.2 638,356 59.8 Gross profit $ 2,675,696 61.1 % $ 1,880,779 63.8 % $ 794,917 42.3 % Gross margin 61.1 % 63.8 % Revenue by Geography (in thousands, except percentages) Year Ended December 31, 2022 % of Total 2021 % of Total Americas $ 3,462,621 79.0 % $ 2,156,183 73.2 % Europe, Middle East and Africa 529,800 12.1 486,836 16.5 Asia-Pacific 388,889 8.9 305,018 10.3 Total revenue $ 4,381,310 100.0 % $ 2,948,037 100.0 % Revenue Product revenue increased by $1.3 billion, or 56.3%, in the year ended December 31, 2022 compared to 2021.
Liquidity and Capital Resources Our principal sources of liquidity are cash, cash equivalents, marketable securities, and cash generated from operations. As of December 31, 2022, our total balance of cash, cash equivalents and marketable securities was $3.0 billion, of which approximately $446.9 million was held outside the U.S. in our foreign subsidiaries.
Liquidity and Capital Resources Our principal sources of liquidity are cash, cash equivalents, marketable securities, and cash generated from operations. As of December 31, 2023, our total balance of cash, cash equivalents and marketable securities was $5.0 billion, of which approximately $770.3 million was held outside the U.S. in our foreign subsidiaries.
Accrued Income Taxes As of December 31, 2022, we have recorded long-term tax liabilities of $83.5 million related to uncertain tax positions; however, we are unable to make a reasonably reliable estimate of the timing of settlement, if any, of these future payments.
Accrued Income Taxes As of December 31, 2023, we have recorded long-term tax liabilities of $95.8 million related to uncertain tax positions; however, we are unable to make a reasonably reliable estimate of the timing of settlement, if any, of these future payments.
Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Operating expenses: Research and development $ 728,394 16.6 % $ 586,752 19.9 % $ 141,642 24.1 % Sales and marketing 326,955 7.5 286,171 9.7 40,784 14.3 General and administrative 93,241 2.1 83,117 2.8 10,124 12.2 Total operating expenses $ 1,148,590 26.2 % $ 956,040 32.4 % $ 192,550 20.1 % Research and development.
Operating Expenses (in thousands, except percentages) Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Operating expenses: Research and development $ 728,394 16.6 % $ 586,752 19.9 % $ 141,642 24.1 % Sales and marketing 326,955 7.5 286,171 9.7 40,784 14.3 General and administrative 93,241 2.1 83,117 2.8 10,124 12.2 Total operating expenses $ 1,148,590 26.2 % $ 956,040 32.4 % $ 192,550 20.1 % Research and development Research and development expenses increased by $141.6 million, or 24.1%, for the year ended December 31, 2022 compared to 2021.
We continue to work closely with our contract manufacturers and supply chain partners to ramp production following a period of delayed component sourcing and workforce disruptions.
We have worked closely with our contract manufacturers and supply chain partners to ramp production following a period of delayed component sourcing and workforce disruptions.
In connection with the Tax Cuts and Jobs Act of 2017 ("TCJA"), effective from January 1st, 2022, the TCJA eliminates the option to deduct research and development expenditures currently and requires taxpayers to capitalize and amortize them over five or fifteen years pursuant to IRC Section 174.
In connection with the TCJA, effective from January 1st, 2022, the TCJA eliminates the option to deduct research and development expenditures currently and requires taxpayers to capitalize and amortize them over five or fifteen years pursuant to IRC Section 174.
Research and development expenses increased by $141.6 million, or 24.1%, for the year ended December 31, 2022 compared to 2021. The increase was primarily due to a $68.6 million increase in personnel costs driven by an increase in headcount, and a $57.5 million increase in new product introduction costs, including third-party engineering and other product development costs. Sales and marketing.
The increase was primarily due to a $68.6 million increase in personnel costs driven by an increase in headcount, and a $57.5 million increase in new product introduction costs, including third-party engineering and other product development costs. Sales and marketing Sales and marketing expenses increased by $40.8 million, or 14.3%, for the year ended December 31, 2022 compared to 2021.
Other Income, Net (in thousands, except percentages) Other income (expense), net consists primarily of interest income from our cash, cash equivalents and marketable securities, gains and losses on our equity investments in privately-held companies and marketable securities, and foreign currency transaction gains and losses.
Other Income, Net (in thousands, except percentages) Other income (expense), net consists primarily of interest income from our cash, cash equivalents and marketable securities, gains and losses on our marketable securities and strategic investments, and foreign currency transaction gains and losses.
Furthermore, we typically provide pricing discounts to large end customers, which may result in lower margins for the period in which such sales occur. We believe that cloud computing represents a fundamental shift from traditional legacy network architectures.
Furthermore, we typically provide pricing discounts to large customers, which reduces gross margins for the period in which such sales occur. We believe that cloud computing represents a fundamental shift from traditional legacy network architectures.
As organizations of all sizes have moved workloads to the cloud, spending on cloud and next-generation data centers has increased rapidly, while traditional legacy IT spending has grown more slowly.
As organizations of all sizes have moved workloads to the cloud, spending on cloud and next-generation data centers has increased rapidly, while traditional legacy IT spending has grown at a slower rate.
Purchase Obligations Purchase obligations represent an estimate of all non-cancellable open purchase orders and contractual obligations, made either directly by Arista or by our contract manufacturers on our behalf, in the ordinary course of business for which we have not received the goods or services.
Our material cash requirements include the following contractual and other obligations: Purchase Obligations Purchase obligations not recorded on our balance sheet represent an estimate of all non-cancellable open purchase orders and contractual obligations, made either directly by Arista or by our contract manufacturers on our behalf, in the ordinary course of business for which we have not received the goods or services.
Earnings from our non-U.S. activities are subject to local country income tax and may also be subject to U.S. income tax. Generally, our U.S. tax obligations are reduced by a credit for foreign income taxes paid on these foreign earnings, which avoids double taxation. Our tax expense to date consists of federal, state and foreign current and deferred income taxes.
Generally, our U.S. tax obligations are reduced by a credit for foreign income taxes paid on these foreign earnings, which avoids double taxation. Our tax expense to date consists of federal, state and foreign current and deferred income taxes.
We expect our gross margin to fluctuate over time, depending on the factors described above. Gross margin decreased from 63.8% for the year ended December 31, 2021 to 61.1% for the year ended December 31, 2022.
We expect our gross margin to fluctuate over time, depending on the factors described above. Gross margin increased from 61.1% for the year ended December 31, 2022 to 61.9% for the year ended December 31, 2023.
The extent of the impact of these factors on our operational and financial performance, including our ability to execute our business strategies and initiatives in the expected time frame, will depend on future developments, the impact on our customers, partners, employees, contract manufacturers and supply chain, all of which continue to evolve and are unpredictable; however, any continued or renewed disruption in manufacturing and supply resulting from these factors could negatively impact our business.
The extent of the impact of these factors on our operational and financial performance, including our ability to execute our business strategies and initiatives in the expected time frame, will depend on future developments, the impact on our customers, partners, employees, contract manufacturers and supply 55 chain, all of which continue to evolve and are unpredictable.
Critical Accounting Estimates We have prepared our consolidated financial statements in accordance with accounting principles generally accepted in the United States ("GAAP" or "U.S.
Critical Accounting Estimates We have prepared our consolidated financial statements in accordance with accounting principles generally accepted in the United States ("GAAP" or "U.S. GAAP") and include our accounts and the accounts of our wholly owned subsidiaries.
In addition, we intend to continue to invest in our research and development organization to enhance the functionality of our existing cloud networking platform, introduce new products and features, and build upon our technology leadership.
In addition, we intend to continue to invest in our research and development organization to enhance the functionality of our existing cloud networking platform, introduce new products and features, and build upon our technology leadership. We believe one of our greatest strengths lies in our ability to rapidly develop new features and applications.
Cost of service revenue primarily consists of personnel and other costs associated with our global customer support and services organizations. Cost of revenue increased by $638.4 million, or 59.8% for the year ended December 31, 2022 compared to 2021.
Cost of service revenue primarily consists of personnel and other costs associated with our global customer support and services organizations. Cost of revenue increased by $524.3 million, or 30.7% for the year ended December 31, 2023 compared to 2022.
GAAP") and include our accounts and the accounts of our wholly owned subsidiaries. 59 Table of Contents The preparation of these consolidated financial statements requires our management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the applicable periods.
The preparation of these consolidated financial statements requires our management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during 63 the applicable periods.
Cash Flows Year Ended December 31, 2022 2021 2020 (in thousands) Cash provided by operating activities $ 492,813 $ 1,015,856 $ 735,114 Cash provided by (used in) investing activities 216,327 (925,562) (608,802) Cash (used in) financing activities (654,601) (360,882) (346,339) Effect of exchange rate changes (3,611) (1,816) 1,966 Net increase (decrease) in cash, cash equivalents and restricted cash $ 50,928 $ (272,404) $ (218,061) Cash Flows from Operating Activities Our operating activities consist of net income, adjusted for certain non-cash items, and changes in assets and liabilities.
Cash Flows Year Ended December 31, 2023 2022 2021 (in thousands) Cash provided by operating activities $ 2,034,014 $ 492,813 $ 1,015,856 Cash provided by (used in) investing activities (687,454) 216,327 (925,562) Cash (used in) financing activities (83,749) (654,601) (360,882) Effect of exchange rate changes 675 (3,611) (1,816) Net increase (decrease) in cash, cash equivalents and restricted cash $ 1,263,486 $ 50,928 $ (272,404) Cash Flows from Operating Activities Our operating activities consist of net income, adjusted for certain non-cash items, and changes in assets and liabilities.
During the year ended December 31, 2021, cash provided by operating activities was $1.0 billion, primarily from net income of $840.9 million and net non-cash adjustments to net income of $181.9 million, partially offset by a net increase of $6.9 million in working capital requirements.
During the year ended December 31, 2023, cash provided by operating activities was $2.0 billion, primarily from net income of $2.1 billion, offset by net non-cash adjustments to net income of $37.4 million, and a net change of $15.9 million in working capital requirements.
Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Provision for income taxes $ 229,350 5.2 % $ 90,025 3.1 % $ 139,325 154.8 % Effective tax rate 14.5 % 9.7 % Our provision for income taxes and effective tax rate increased in 2022 as compared to 2021.
In addition, we had unrealized gains of $27.5 million in the year ended December 31, 2022 related to our equity investments. 60 Provision for Income Taxes (in thousands, except percentages) Year Ended December 31, 2022 2021 Change in $ % of Revenue $ % of Revenue $ % Provision for income taxes $ 229,350 5.2 % $ 90,025 3.1 % $ 139,325 154.8 % Effective tax rate 14.5 % 9.7 % Our provision for income taxes and effective tax rate increased in 2022 as compared to 2021.
For example, sales to our end customers Microsoft and Meta Platforms in fiscal 2022 represented 16% and 26% of our total revenue, respectively, whereas sales to our end customer Microsoft in fiscal 2020 and 2021 amounted to 22% and 15% of our total revenue, respectively, with our end customer Meta Platforms representing less than 10% of our total revenue in both fiscal 2020 and 2021.
For example, sales to our end customers Microsoft and Meta Platforms represented 18% and 21% of our total revenue, respectively, in fiscal 2023, 16% and 26% of our total revenue, respectively, in fiscal 2022 and, 15% and less than 10% of our total revenue, respectively in fiscal 2021.
We have experienced unpredictability in the timing of or ders from these large end customers primarily due to changes in demand patterns specific to these customers, the time it takes these end customers to evaluate, test, qualify and accept our newer products, and the overall complexity of these large orders.
We have experienced unpredictability in the timing of orders from these large customers primarily due to the time it takes these customers to evaluate, test, qualify and accept our newer products, the overall complexity of these large orders and changes in demand patterns specific to these customers, including reductions in capital expenditures by these customers and the impact of cost reduction and other efficiency efforts by these customers.
General and administrative personnel costs include those for our executive, finance, human resources and legal functions. Our professional services costs are primarily related to external legal, accounting, and tax services. General and administrative expenses increased by $10.1 million, or 12.2%, for the year ended December 31, 2022 compared to 2021.
General and administrative expenses consist primarily of personnel costs and professional services costs for our finance, human resources, legal and certain executive functions. Our professional services costs are primarily related to external legal, accounting, and tax services. General and administrative expenses increased by $25.8 million, or 27.7%, for the year ended December 31, 2023 compared to 2022.
During the year ended December 31, 2021, cash used in financing activities was $360.9 million, consisting primarily of payments for repurchases of our common stock of $411.6 million and taxes paid of $16.5 million upon vesting of restricted stock units, offset partially by proceeds from the issuance of common stock under employee equity incentive plans of $67.2 million.
During the year ended December 31, 2023, cash used in financing activities was $83.7 million, consisting primarily of common stock repurchases of $112.3 million and taxes paid of $33.6 million upon vesting of restricted stock units, offset partially by proceeds from the issuance of common stock under employee equity incentive plans of $62.1 million.
As of December 31, 2022, we had $3.7 billion of such purchase obligations, of which $2.9 billion are expected to be received within 12 months, and $0.8 billion are e xpected to be received after one year.
As of December 31, 2023, we had $1,586.7 million of such purchase obligations, of which $1,547.2 million are expected to be received within 12 months, and $39.5 million are e xpected to be received after one year.
These increases were primarily driven by a corresponding increase in product and service revenues, combined with an increase 52 Table of Contents in material and logistics costs to mitigate supply chain constraints and to meet customer demand, as well as an increase in provisions for excess/obsolete finished goods and component inventory.
These increases were primarily driven by a corresponding increase in product and service revenues, combined with an increase in material and logistics costs to mitigate supply chain constraints and to meet customer demand, as well as an increase in provisions for excess/obsolete finished goods and component inventory. 59 Gross margin decreased from 63.8% for the year ended December 31, 2021 to 61.1% for the year ended December 31, 2022.
We also believe that any extended or renewed economic disruptions or deterioration in the global economy could have a negative impact on demand from our customers in future periods. Accordingly, current results and financial condition discussed herein may not be indicative of future operating results and trends.
In addition, any prolonged economic disruptions or further deterioration in the global economy could have a negative impact on demand from our customers in future periods, particularly in the enterprise market where we are continuing to expand our penetration. Accordingly, current results and financial conditions discussed herein may not be indicative of future operating results and trends.
We believe one of our greatest strengths lies in our ability to rapidly develop new features and applications. 50 Table of Contents Our development model is focused on the development of new products based on our EOS software and enhancements to EOS. We engineer our products to be agnostic with respect to the underlying merchant silicon architecture.
Our development model is focused on the development of new products based on our EOS software and enhancements to EOS. We engineer our products to be agnostic with respect to the underlying merchant silicon architecture.
Service revenue increased by $83.6 million, or 17.2%, in the year ended December 31, 2021 compared to 2020, as a result of continued growth in initial and renewal PCS contracts as our customer installed base continued to expand.
In addition, service revenue increased by $165.4 million, or 24.9%, in the year ended December 31, 2023 compared to 2022, as a result of continued growth in initial and renewal support contracts as our customer installed base has continued to expand.
In the fourth quarter of 2021, our board of directors authorized an additional $1.0 billion stock repurchase program (the "New Repurchase Program"). This authorization allows us to repurchase shares of our common stock and will be funded from working capital. The New Repurchase Program commenced in the fourth quarter of 2021, and expires on the three-year anniversary thereof.
Stock Repurchase Programs In October 2021, our board of directors authorized a $1.0 billion stock repurchase program (the “Repurchase Program”). This authorization allows us to repurchase shares of our common stock funded from working capital and expires in the fourth quarter of 2024.
Sales and marketing expenses increased by $40.8 million, or 14.3%, for the year ended December 31, 2022 compared to 2021. The increase was primarily caused by increased personnel costs driven by headcount growth. 53 Table of Contents General and administrative. General and administrative expenses consist primarily of personnel costs and professional services costs.
The increase was primarily caused by increased personnel costs driven by headcount growth. General and administrative General and administrative expenses increased by $10.1 million, or 12.2%, for the year ended December 31, 2022 compared to 2021.
We generally use a range of amounts to estimate SSP for individual products and services based on multiple factors including, but not limited to, the sales channel (reseller, distributor or end customer), the geographies in which our products and services are sold, and the size of the end customer.
We generally use a range of amounts to estimate SSP for individual products and services based on multiple factors including, but not limited to, product category, actual and expected volume, discounting policies, and end customer vertical and size.
In addition, although our business has experienced limited disruption as a result of the Russia-Ukraine conflict, continued escalation of the conflict may negatively impact the global economy and our future operating results and financial condition. Management continues to actively monitor the impact of these macroeconomic factors on the Company's financial condition, liquidity, operations, suppliers, industry, and workforce.
In addition, although our business has experienced limited disruption as a result of the recent Russia-Ukraine conflict, continued escalation of this conflict as well as the Israeli-Hamas conflict and Houthi movement in the Red Sea may negatively impact the global economy and our future operating results and financial condition.
Product revenue increased by $1.3 billion, or 56.3%, in the year ended December 31, 2022 compared to 2021. The increase reflects strong demand for our switching and routing platforms from across our customer base, including healthy contributions from our large cloud customers.
The increase reflects strong demand for our switching and routing platforms from across our customer base, including healthy contributions from our large cloud customers.
The New Repurchase Program does not obligate us to acquire any of our common stock and may be suspended or discontinued by the company at any time without prior notice. As of December 31, 2022, the remaining authorized amount for repurchases under the New Repurchase Program was $256.8 million. Refer to Note 6.
The Repurchase Program does not obligate us to acquire any of our common stock and may be suspended or discontinued by the company at any time without prior notice. During the three months ended December 31, 62 2023, we did not repurchase any shares.
The increase was primarily driven by increased headcount and higher sales volume resulting in increased personnel costs. General and administrative General and administrative expenses increased by $16.9 million, or 25.5%, for the year ended December 31, 2021 compared to 2020.
Sales and marketing expenses increased by $72.1 million, or 22.0%, for the year ended December 31, 2023 compared to 2022. The increase was primarily caused by increased personnel costs driven by headcount growth, in addition to increased sales and marketing events and field demonstration costs. General and administrative.
There is however no guarantee that all suppliers will meet their commitments in the time frame committed or that actual customer demand will directly match our demand forecasts.
While inventory and working capital levels may remain elevated in the near term, we expect that purchase commitments will continue to decline as supplier lead times shorten. There is however no guarantee that all suppliers will meet their commitments in the time frame committed or that actual customer demand will directly match our demand forecasts.
EOS, combined with a set of network applications and ethernet switching and routing platforms using merchant silicon, provides improved price/performance and time to market, delivering a cloud networking solution with high performance scale and availability, and enabling network automation, visibility, and security.
Arista EOS, combined with a set of network applications and our Ethernet switching and routing platforms using best of breed merchant silicon, provides customers with a highly competitive and diversified portfolio of products with improved price/performance and time to market.
Cost of Revenue and Gross Margin Cost of product revenue primarily consists of amounts paid for inventory to our third-party contract manufacturers and merchant silicon vendors, overhead costs of our manufacturing operations, including freight, and other costs associated with manufacturing our products and managing our inventory and supply chain.
International revenu es as a percentage of our total revenues decreased fro m 21.0% in 2 022 to 20.6% in 2023, which was primarily driven by changes in the geographic mix of sales to our large global customers. 56 Cost of Revenue and Gross Margin Cost of product revenue primarily consists of amounts paid for inventory to our third-party contract manufacturers and merchant silicon vendors, overhead costs of our manufacturing operations, including freight, and other costs associated with manufacturing our products and managing our inventory and supply chain.
In addition, we had unrealized gains of $27.5 million in the year ended December 31, 2022 related to our equity investments. Provision for Income Taxes (in thousands, except percentages) We operate in a number of tax jurisdictions and are subject to taxes in each country or jurisdiction in which we conduct business.
Provision for Income Taxes (in thousands, except percentages) We operate in a number of tax jurisdictions and are subject to taxes in each country or jurisdiction in which we conduct business. Earnings from our non-U.S. activities are subject to local country income tax and may also be subject to U.S. income tax.
We and our fulfillment partners then perform labeling, final configuration, quality assurance testing and shipment to our customers. Macroeconomic Update Global economic and business activities continue to face widespread macroeconomic uncertainties, including supply chain constraints, inflation and monetary policy shifts, recession risks, the COVID-19 pandemic, and potential disruptions from the Russia-Ukraine conflict and U.S. trade war with China.
Macroeconomic Update Global economic and business activities continue to face widespread macroeconomic uncertainties, including inflation, monetary policy shifts, recession risks, and potential supply chain and other disruptions such as the Russia-Ukraine and Israel-Hamas conflicts, the Houthi attacks on marine vessels in the Red Sea, and the U.S. trade war with China.
We believe that we will be able to fund these obligations through cash generated from operations and from our existing balances of cash, cash equivalents and marketable securities. Our material cash requirements include the following contractual and other obligations: Leases We have operating lease arrangements for office space, data center, equipment and other corporate assets.
Material cash requirements Our material cash requirements will have an impact on our future liquidity. Our material cash requirements represent material expected or contractually committed future payment obligations. We believe that we will be able to fund these obligations through cash generated from operations and from our existing balances of cash, cash equivalents and marketable securities.
Stockholders' Equity and Stock-Based Compensation of the Notes to Consolidated Financial Statements included in Part II, Item 8, of this Annual Report on Form 10-K for further discussion. Material cash requirements Our material cash requirements will have an impact on our future liquidity. Our material cash requirements represent material expected or contractually committed future payment obligations.
As of December 31, 2023, the remaining authorized amount for repurchases under the Repurchase Program was $144.5 million. Refer to Note 6. Stockholders' Equity and Stock-Based Compensation of the Notes to Consolidated Financial Statements included in Part II, Item 8, of this Annual Report on Form 10-K for further discussion.
As of December 31, 2022, we had lease payment obligations, net of immaterial sublease income, of $71.4 million, with $22.5 million payable within 12 months.
Leases We have operating lease arrangements for office space, data center, equipment and other corporate assets. As of December 31, 2023, we had lease payment obligations, net of immaterial sublease income, of $72.0 million, with $24.0 million payable within 12 months.
Overview Arista Networks is an industry leader in data-driven, cognitive cloud networking for next-generation data center and campus workspace environments.
Overview Arista Networks is an industry leader in data-driven, client to cloud networking for large data center, campus and routing environments. Arista's platforms deliver availability, agility, automation, analytics and security through an advanced network operating stack.
N o material change to our effective tax rate resulted from this new regulation.
There is no material change to our effective tax rate as a result of this regulation.
International revenues increased from 23.5% in 2020 to 26.8% in 2021, which was mostly driven by increased shipments to our large end customers in the EMEA region. Cost of Revenue and Gross Margin Cost of revenue increased by $231.6 million or 27.7% for the year ended December 31, 2021 compared to 2020.
Cost of Revenue and Gross Margin Cost of revenue increased by $638.4 million, or 59.8% for the year ended December 31, 2022 compared to 2021.
Our operating cash-flows have also been and may continue to be negatively impacted by increased component inventories on hand or at our contract manufacturers, awaiting supply of a limited number of scarce components necessary to build and ship the completed product.
Our operating cash-flows have also been and may continue to be negatively impacted by significant component inventories on hand or at our contract manufacturers. While we have seen improvements in our supply chain and manufacturing operations, any remaining or new supply chain and manufacturing related constraints could negatively impact our business in future periods.
The increase was primarily due to a $67.0 million increase in personnel costs driven by an increase in headcount, and a $32.3 million increase in new product introduction costs, including third-party engineering and other product development costs. Sales and marketing Sales and marketing expenses increased by $56.8 million, or 24.8%, for the year ended December 31, 2021 compared to 2020.
The increase was primarily due to a $84.1 million increase in personnel costs driven by an increase in headcount, and a $40.7 million increase in new product introduction costs, including non-recurring engineering costs and prototype expenses as we expand our product portfolio. 57 Sales and marketing.
As of December 31, 2022, we had delivered our cloud networking solutions to over 9,000 end customers worldwide. Our end customers span a range of industries and include large internet companies, service providers, financial services organizations, government agencies, media and entertainment companies, telecommunication service providers and other cloud service providers.
Our customers span a range of industries and geographies including large cloud customers or hyperscalers, other internet providers, service providers, financial services organizations, government agencies and a cross section of enterprise customers.
The increase in working capital primarily consisted of a $170.5 million increase in inventory to help mitigate the impact of COVID-19 related supply chain disruptions, a $134.8 million increase in prepaid and other current assets primarily driven by an increase in deferred cost of sales associated with higher product revenue deferrals, increased inventory deposits to our contract manufacturers, and higher prepaid taxes and other assets.
The change in working capital requirements primarily 61 consisted of a $655.5 million increase in inventory in response to a significant increase in business volume, a $101.5 million increase in accounts receivable due to the larger business volume and timing of shipments in the fourth quarter of 2023, as well as a $66.4 million increase in other assets primarily driven by increased deferred cost of sales associated with higher product revenue deferrals.
As of December 31, 2022, the incremental cash tax impact resulting from the new regulations was approximately $195.0 million for the year, of which substantially all of the liability for the full year has been paid. In addition, we may incur incremental cash taxes of up to $180.0 million in fiscal 2023.
As of December 31, 2023, the incremental cash tax impact resulting from the regulation was approximately $191.7 million for the year, of which substantially all the liability has been paid. It is anticipated that IRC Section 174 will result in cash tax outlays exceeding our income tax expense over the next three years unless the current legislation is changed.
The net non-cash adjustments primarily consist of $186.9 million of stock-based compensation expenses, $50.3 million of depreciation and amortization expenses and $26.8 million of amortization of investment premiums (discounts), all of which were offset by the deferred income tax adjustment of $99.3 million.
Net non-cash adjustments primarily consisted of an increase in deferred income taxes of $370.8 million primarily resulting from increased deferred tax assets associated with the capitalization of research and development costs under IRC Section 174, which were largely offset by $296.8 million of stock-based compensation expenses and $70.6 million of depreciation, amortization and other expenses.