Biggest changeThe decrease in free cash flow for the year ended December 31, 2022 compared to 2021 was primarily as a result of an increase in our investment in research and development activities. 63 Results of Operations The following table sets forth our results of operations for the periods presented: Year Ended December 31, Change 2023 versus 2022 2023 2022 2021 $ % (in thousands) Revenue $ 614,490 $ 497,001 $ 395,524 $ 117,489 23.6 % Cost of revenue (1) 432,148 347,323 274,144 84,825 24.4 % Gross profit 182,342 149,678 121,380 32,664 21.8 % Gross margin 29.7 % 30.1 % 30.7 % Operating expenses Research and development (1) 44,248 41,220 34,122 3,028 7.3 % Sales and marketing (1) 83,996 73,295 43,917 10,701 14.6 % General and administrative (1) 36,005 38,139 32,968 (2,134 ) -5.6 % Total operating expenses 164,249 152,654 111,007 11,595 7.6 % Income (loss) from operations 18,093 (2,976 ) 10,373 21,069 n/m Other income (expense) Interest income, net 7,019 1,663 (6 ) 5,356 322.1 % Foreign exchange (loss) gain 12 5 (1 ) 7 n/m Income (loss) before income taxes 25,124 (1,308 ) 10,366 26,432 n/m Benefit from (provision for) income taxes (2,802 ) 795 (1,066 ) (3,597 ) -452.5 % Net income (loss) $ 22,322 $ (513 ) $ 9,300 $ 22,835 n/m (1) Stock-based compensation expense was allocated in cost of revenue and operating expenses as follows: Year Ended December 31, 2023 2022 2021 (in thousands) Cost of revenue $ 156 $ — $ — Research and development 1,990 1,647 517 Sales and marketing 2,808 1,736 280 General and administrative 4,436 3,353 2,339 Total stock-based compensation $ 9,390 $ 6,736 $ 3,136 The following table presents the components of our consolidated statements of operations for the periods presented as a percentage of revenue: Year Ended December 31, 2023 2022 2021 Revenue 100.0 % 100.0 % 100.0 % Cost of revenue 70.3 % 69.9 % 69.3 % Gross profit 29.7 % 30.1 % 30.7 % Operating expenses Research and development 7.2 % 8.3 % 8.6 % Sales and marketing 13.7 % 14.7 % 11.1 % General and administrative 5.9 % 7.7 % 8.4 % Total operating expenses 26.8 % 30.7 % 28.1 % Income (loss) from operations 2.9 % -0.6 % 2.6 % Other income (expense) Interest income, net 1.1 % 0.3 % 0.0 % Foreign exchange (loss) gain 0.0 % 0.0 % 0.0 % Income (loss) before income taxes 4.0 % -0.3 % 2.6 % Benefit from (provision for) income taxes -0.5 % 0.2 % -0.3 % Net income (loss) 3.5 % -0.1 % 2.3 % 64 Comparison of the Years Ended December 31, 2023 and 2022 Revenue The increase in revenue was primarily driven by an increase in the number of transactions processed, which was driven by the implementation of new billers and increased transactions from our existing billers.
Biggest changeThe increase in free cash flow for the year ended December 31, 2023 compared to 2022 was primarily as a result of an increase in cash generated from operations. 63 Results of Operations The following table sets forth our results of operations for the periods presented: Year Ended December 31, Change 2024 versus 2023 2024 2023 2022 $ % (in thousands) Revenue $ 871,745 $ 614,490 $ 497,001 $ 257,255 41.9 % Cost of revenue (1) 633,575 432,148 347,323 201,427 46.6 % Gross profit 238,170 182,342 149,678 55,828 30.6 % Gross margin 27.3 % 29.7 % 30.1 % Operating expenses Research and development (1) 51,334 44,248 41,220 7,086 16.0 % Sales and marketing (1) 105,052 83,996 73,295 21,056 25.1 % General and administrative (1) 36,927 36,005 38,139 922 2.6 % Total operating expenses 193,313 164,249 152,654 29,064 17.7 % Income (loss) from operations 44,857 18,093 (2,976 ) 26,764 147.9 % Interest income, net 8,742 7,019 1,663 1,723 24.5 % Other income 345 12 5 333 n/m Income (loss) before income taxes 53,944 25,124 (1,308 ) 28,820 114.7 % (Provision for) benefit from income taxes (9,775 ) (2,802 ) 795 (6,973 ) 248.9 % Net income (loss) $ 44,169 $ 22,322 $ (513 ) $ 21,847 97.9 % (1) Stock-based compensation expense was allocated in cost of revenue and operating expenses as follows: Year Ended December 31, 2024 2023 2022 (in thousands) Cost of revenue $ 251 $ 156 $ — Research and development 3,100 1,990 1,647 Sales and marketing 5,639 2,808 1,736 General and administrative 3,865 4,436 3,353 Total stock-based compensation $ 12,855 $ 9,390 $ 6,736 The following table presents the components of our consolidated statements of operations for the periods presented as a percentage of revenue: Year Ended December 31, 2024 2023 2022 Revenue 100.0 % 100.0 % 100.0 % Cost of revenue 72.7 % 70.3 % 69.9 % Gross profit 27.3 % 29.7 % 30.1 % Operating expenses Research and development 5.9 % 7.2 % 8.3 % Sales and marketing 12.1 % 13.7 % 14.7 % General and administrative 4.2 % 5.9 % 7.7 % Total operating expenses 22.2 % 26.8 % 30.7 % Income (loss) from operations 5.1 % 2.9 % (0.6 )% Interest income, net 1.0 % 1.1 % 0.3 % Other income 0.0 % 0.0 % 0.0 % Income (loss) before income taxes 6.1 % 4.0 % (0.3 )% (Provision for) benefit from income taxes (1.1 )% (0.5 )% 0.2 % Net income (loss) 5.0 % 3.5 % (0.1 )% 64 Comparison of the Years Ended December 31, 2024 and 2023 Revenue The increase in revenue was primarily driven by an increase in the number of transactions processed, which was driven by the implementation of new billers and increased transactions from our existing billers.
Our non-GAAP measures may 61 not be comparable to similarly titled measures of other companies; other companies, including companies in our industry, may calculate non-GAAP measures differently than we do, limiting the usefulness of those measures for comparative purposes.
Our non-GAAP measures may not be comparable to similarly titled measures of other companies; other companies, including companies in our industry, 61 may calculate non-GAAP measures differently than we do, limiting the usefulness of those measures for comparative purposes.
We consider all available evidence, both positive and negative, including historical levels of income, expectations and risks associated with estimates of future taxable income, in assessing the need for a valuation allowance. Our tax positions are subject to income tax audits by multiple tax jurisdictions such as USA, Canada and India.
We consider all available evidence, both positive and negative, including historical levels of income, expectations and risks associated with estimates of future taxable income, in assessing the need for a valuation allowance. 69 Our tax positions are subject to income tax audits by multiple tax jurisdictions such as USA, Canada and India.
Expected Term —The expected life of options granted to employees was determined by using management’s best estimation of exercise activity. 69 Risk-free Interest Rate —We use a risk-free interest rate in the option valuation model based on U.S. Treasury zero-coupon issues, with remaining terms similar to the expected term of the options.
Expected Term —The expected life of options granted to employees was determined by using management’s best estimation of exercise activity. Risk-free Interest Rate —We use a risk-free interest rate in the option valuation model based on U.S. Treasury zero-coupon issues, with remaining terms similar to the expected term of the options.
Under the acquisition method, once control is obtained of a business, the assets acquired, and liabilities assumed are recorded at fair value. We use our best estimates and assumptions to assign fair value to the tangible and intangible assets acquired and liabilities assumed at the acquisition date.
Under the acquisition method, once control is obtained of a business, the assets acquired, and liabilities assumed are recorded at fair value. We use our best estimates and assumptions to assign fair value 67 to the tangible and intangible assets acquired and liabilities assumed at the acquisition date.
Goodwill impairment is recognized when the quantitative assessment results in the carrying value of the reporting unit exceeding its fair value, in which case an impairment charge is recorded to goodwill to the extent the carrying value exceeds the fair value, limited to the amount of goodwill.
Goodwill impairment is recognized when the quantitative assessment results in the carrying value of the reporting unit exceeding its fair value, in which case an impairment charge is recorded to goodwill to the extent the carrying value exceeds 68 the fair value, limited to the amount of goodwill.
Recent Accounting Pronouncements See Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K for more information regarding recently issued accounting pronouncements. 70
Recent Accounting Pronouncements See Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K for more information regarding recently issued accounting pronouncements.
We expect our sales and marketing expenses to increase in absolute dollars, but they may fluctuate as a percentage of revenue from period to period. General and Administrative General and administrative expenses consist primarily of personnel-related expenses, including stock-based compensation expenses for finance, risk management, legal and compliance, human resources, information technology and facilities personnel.
We expect our sales and marketing expenses to increase in absolute dollars alongside revenue growth, but they may fluctuate as a percentage of revenue from period to period. General and Administrative General and administrative expenses consist primarily of personnel-related expenses, including stock-based compensation expenses for finance, risk management, legal and compliance, human resources, information technology and facilities personnel.
A discussion of changes in our results of operations from fiscal year 2021 to fiscal year 2022 and a discussion of our liquidity and capital resources for 2021 has been omitted from this Annual Report on Form 10-K but may be found under the heading "Management’s Discussion and Analysis of Financial Condition and Results of Operations—Comparison of the Years Ended December 31, 2022 and 2021" and "—Liquidity and Capital Resources—"Sources and Uses of Funds" and "—Historical Cash Flows" in our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on March 3, 2023, which is available free of charge on the SECs website at www.sec.gov and our website at https://ir.paymentus.com/home/default.aspx.
A discussion of changes in our results of operations from fiscal year 2022 to fiscal year 2023 and a discussion of our liquidity and capital resources for 2022 has been omitted from this Annual Report on Form 10-K but may be found under the heading "Management’s Discussion and Analysis of Financial Condition and Results of Operations—Comparison of the Years Ended December 31, 2023 and 2022" and "—Liquidity and Capital Resources—"Sources and Uses of Funds" and "—Historical Cash Flows" in our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on March 5, 2024, which is available free of charge on the SECs website at www.sec.gov and our website at https://ir.paymentus.com/home/default.aspx .
Overview We are a leading provider of cloud-based bill payment technology and solutions. We deliver our next-generation product suite through a modern technology stack to more than 2,200 biller business and financial institution clients.
Overview We are a leading provider of cloud-based bill payment technology and solutions. We deliver our next-generation product suite through a modern technology stack to more than 2,500 biller business and financial institution clients.
We expect that cost of revenue will increase in absolute dollars, but it may fluctuate as a percentage of revenue from period to period, as our transaction mix changes and we continue to invest in growing our business across all geographical segments, including through the acquisition of other businesses.
We expect that cost of revenue will increase in absolute dollars alongside revenue growth, but it may fluctuate as a percentage of revenue from period to period, as our transaction mix changes and we continue to invest in growing our business across all geographical segments, including through the potential acquisition of other businesses.
Adjusted EBITDA We calculate adjusted EBITDA as net income before other income (expense), which consists of interest income (expense), depreciation and amortization of acquisition-related intangible assets and capitalized software development costs, and income taxes, adjusted to exclude the effects of net foreign exchange gain (loss), stock-based compensation expense and certain nonrecurring expenses that management believes are not indicative of ongoing operations.
Adjusted EBITDA We define adjusted EBITDA as net income before interest income (expense), net, other income (expense), depreciation and amortization of acquisition-related intangible assets and capitalized software development costs, and income taxes, adjusted to exclude the effects of net foreign exchange gain (loss), stock-based compensation expense and certain nonrecurring expenses that management believes are not indicative of ongoing operations.
The increase in 2023 was primarily driven by growth in transaction count and volume driven by the addition of new billers and financial institutions and increased transactions from our existing billers and financial institutions, together with improvements resulting from disinflation in the utility sector on a year over year basis, pricing improvements from customers related to our inflation management, the implementation of certain cost improvement measures and lower general and administrative expenditures primarily driven by lower insurance premiums and acquisition related costs.
Adjusted EBITDA increased from 2022 to 2023 due to growth in transaction count and volume driven by the addition of new billers and financial institutions and increased transactions from our existing billers and financial institutions, together with improvements resulting from disinflation in the utility sector on a year over year basis, pricing improvements from customers related to our inflation management, the implementation of certain cost improvement measures and lower general and administrative expenditures primarily driven by lower insurance premiums and acquisition related costs.
Transactions Processed Year Ended December 31, 2023 2022 2021 (in millions) Transactions processed 458.2 366.8 280.5 We define transactions processed as the number of revenue generating payment transactions, such as checks, credit card and debit card transactions, automated clearing house, or ACH, items and emerging payment types, which are initiated and generally processed through our platform during a period.
Transactions Processed Year Ended December 31, 2024 2023 2022 (in millions) Transactions processed 597.0 458.2 366.8 We define transactions processed as the number of revenue generating payment transactions, such as checks, credit card and debit card transactions, automated clearing house, or ACH, items and emerging payment types, which are initiated and generally processed through our platform during a period.
General and administrative expenses also include costs incurred for external professional services, leasing of office buildings and other corporate expenses. We expect to continue to incur additional general and administrative expenses to support the growth in our business.
General and administrative expenses also include costs incurred for external professional services, leasing of office buildings and other corporate expenses. We expect to continue to incur additional general and administrative expenses to support the growth in our business and to meet regulatory compliance requirements.
The increase in 2023 was primarily driven by growth in transaction count and volume driven by the addition of new billers and financial institutions and increased transactions from our existing billers and financial institutions, together with improvements resulting from disinflation in the utility sector on a year over year basis, pricing improvements from customers related to our inflation management and the implementation of certain cost improvement measures.
The increase in 2023 was primarily driven by the addition of new billers and increased transactions from our existing billers, together with improvements resulting from disinflation in the utility sector on a year over year basis, pricing improvements from customers related to our inflation management and the implementation of certain cost improvement measures.
The number of transactions also includes account-to-account and person-to-person transfers. The number of transactions processed during the year ended December 31, 2023 increased approximately 24.9% as compared to 2022. The number of transactions processed during the year ended December 31, 2022 increased approximately 30.8% as compared to 2021.
The number of transactions also includes account-to-account and person-to-person transfers. The number of transactions processed during the year ended December 31, 2024 increased approximately 30.3% as compared to 2023. The number of transactions processed during the year ended December 31, 2023 increased approximately 24.9% as compared to 2022.
Net cash provided by operating activities mainly consists of our net income (loss) adjusted for certain non-cash items, including depreciation and amortization, stock-based compensation, other non-cash income and expense items, and net changes in operating assets and liabilities. Net cash provided by operating activities for the year ended December 31, 2023 was $68.8 million.
Net cash provided by operating activities mainly consists of our net income (loss) adjusted for certain non-cash items, including depreciation and amortization, stock-based compensation, other non-cash income and expense items, and net changes in operating assets and liabilities. Net cash provided by operating activities for the year ended December 31, 2024 was $63.6 million.
We had more than 2,200 billers and financial institution clients as of December 31, 2023, including billers of all sizes and across numerous vertical markets and financial institutions of all sizes.
We had more than 2,500 billers and financial institution clients as of December 31, 2024, including billers of all sizes and across numerous vertical markets and financial institutions of all sizes.
We acquire new billers through direct sales channels, software and strategic partnerships and our Instant Payment Network, or IPN, which together promote rapid adoption of our platform through partnerships with leading business networks. Through these channels, our platform reaches millions of consumers, driving transaction growth. Our revenue is highly visible.
We acquire new billers through direct sales channels, software and strategic partnerships and our Instant Payment Network, or IPN, which together promote rapid adoption of our platform through partnerships with leading business networks. Through these channels, our platform reaches millions of consumers, driving transaction growth. Our revenue is predictable to a certain degree.
There are external factors that impact interchange fees, such as the average transaction amount in a particular month or quarter. For example, hot summers and cold winters tend to increase utility bills, and property taxes result in two larger payments per year, each of which increases our interchange cost. Gross profit is equal to our revenue less cost of revenue.
There are external factors that impact interchange fees, such as the average transaction amount in a particular month or quarter. For example, hot summers and cold winters tend to increase utility bills, and property taxes result in two larger payments per year, each of which increases our interchange cost in line with the seasonal nature of our business.
Adjusted gross profit is driven primarily by the same factors that impact gross profit with the exception of excluding the amortization in cost of revenue, as well as stock based compensation. The 2023 increase in amortization was driven by the additional capitalization of software costs.
Adjusted gross profit is driven primarily by the same factors that impact gross profit with the exception of excluding the amortization in cost of revenue, as well as stock-based compensation.
Components of Results of Operations Revenue We generate substantially all of our revenue from payment transaction fees. Transaction fees are fees collected for each transaction processed through our platform, on either a fixed basis or variable basis based on the transaction value, with the actual fees dependent on type of transaction, payment or transaction channel and industry vertical.
Transaction fees are fees collected for each transaction processed through our platform, on either a fixed basis or variable basis based on the transaction value, with the actual fees dependent on type of transaction, payment or transaction channel and industry vertical.
Contribution Profit Year Ended December 31, 2023 2022 2021 (in thousands) Gross profit $ 182,342 $ 149,678 $ 121,380 Plus: other cost of revenue 58,606 51,622 37,098 Contribution profit $ 240,948 $ 201,300 $ 158,478 In general, contribution profit is driven by the number of transactions we process offset by network fees associated with processing those transactions.
Contribution Profit Year Ended December 31, 2024 2023 2022 (in thousands) Gross profit $ 238,170 $ 182,342 $ 149,678 Plus: other cost of revenue 73,898 58,606 51,622 Contribution profit $ 312,068 $ 240,948 $ 201,300 In general, contribution profit is driven by the number of transactions we process offset by network fees associated with processing those transactions.
Contribution profit for the year ended December 31, 2023 increased approximately 19.7% as compared to 2022 and increased approximately 27.0% for the year ended December 31, 2022 as compared to 2021.
Contribution profit for the year ended December 31, 2024 increased approximately 29.5% as compared to 2023 and increased approximately 19.7% for the year ended December 31, 2023 as compared to 2022.
(1) Consists of operating lease liabilities for office space and data centers. (2) Consists of purchase obligations which were not recognized on the balance sheet as of December 31, 2023, related primarily to infrastructure services and IT software and maintenance service costs. (3) Consists of Acquisition holdback payments due to the former owners of Finovera and PROFIT.
(2) Consists of purchase obligations which were not recognized on the balance sheet as of December 31, 2024, related primarily to infrastructure services and IT software and maintenance service costs. (3) Consists of Acquisition holdback payments due to the former owners of PROFIT.
We also typically contract directly with our billers and have complete pricing latitude on the processing fees charged to our billers. As such, we bear the credit risk for network fees and transactions charged back to the biller.
We have concluded that we are typically the principal in our payment processing arrangements as we control the service on our platform. We also typically contract directly with our billers and have complete pricing latitude on the processing fees charged to our billers. As such, we bear the credit risk for network fees and transactions charged back to the biller.
Adjusted Gross Profit Year Ended December 31, 2023 2022 2021 (in thousands) Gross profit $ 182,342 $ 149,678 $ 121,380 Stock-based compensation 156 — — Amortization of capitalized software development costs 13,341 8,761 4,900 Amortization of acquisition-related intangibles 3,314 3,316 1,105 Adjusted gross profit $ 199,153 $ 161,755 $ 127,385 Adjusted gross profit for the year ended December 31, 2023 increased 23.1% as compared to 2022 and increased 27.0% for the year ended December 31, 2022 as compared to 2021.
Adjusted Gross Profit Year Ended December 31, 2024 2023 2022 (in thousands) Gross profit $ 238,170 $ 182,342 $ 149,678 Stock-based compensation 251 156 — Amortization of capitalized software development costs 17,911 13,341 8,761 Amortization of acquisition-related intangibles 3,313 3,314 3,316 Adjusted gross profit $ 259,645 $ 199,153 $ 161,755 Adjusted gross profit for the year ended December 31, 2024 increased 30.4% as compared to 2023 and increased 23.1% for the year ended December 31, 2023 as compared to 2022.
Free Cash Flow Year Ended December 31, 2023 2022 2021 (in thousands) Net cash (used in) provided by operating activities $ 68,828 $ 19,867 $ 19,493 Purchases of property and equipment and software (600 ) (1,257 ) (979 ) Other intangible assets acquired — (280 ) (130 ) Capitalized software development costs (33,699 ) (29,763 ) (19,300 ) Free cash flow $ 34,529 $ (11,433 ) $ (916 ) Net (cash used in) provided by investing activities $ (34,299 ) $ (34,560 ) $ (77,809 ) Net cash (used in) provided by financing activities $ (1,195 ) $ (37,283 ) $ 213,487 The increase in free cash flow for the year ended December 31, 2023 compared to 2022 was primarily as a result of increases in cash generated from operations.
Free Cash Flow Year Ended December 31, 2024 2023 2022 (in thousands) Net cash provided by operating activities $ 63,634 $ 68,828 $ 19,867 Purchases of property and equipment (457 ) (600 ) (1,257 ) Other intangible assets acquired — — (280 ) Capitalized internal-use software development costs (36,119 ) (33,699 ) (29,763 ) Free cash flow $ 27,058 $ 34,529 $ (11,433 ) Net cash used in investing activities $ (36,761 ) $ (34,299 ) $ (34,560 ) Net cash used in financing activities $ (207 ) $ (1,195 ) $ (37,283 ) The decrease in free cash flow for the year ended December 31, 2024 compared to 2023 was primarily as a result of a decrease in cash generated from operations, together with increases in capitalized software development costs.
Net income was $22.3 million, adjusted for non-cash charges of $45.3 million consisting primarily of depreciation and amortization, stock-based compensation, amortization of contract assets and non-cash lease expense, which contributed positively to operating activities. This was decreased by net cash outflows of $1.2 million used in changes in our operating assets and liabilities.
Net income was $44.2 million, adjusted for non-cash charges of $55.4 million consisting primarily of depreciation and amortization, stock-based compensation, amortization of capitalized contract acquisition costs and warrants cost, and non-cash lease expense, which contributed positively to operating activities. This was decreased by net cash outflows of $36.0 million for changes in our operating assets and liabilities.
For example, if we received information that indicated the useful life of all internally developed software was one year rather than three to five, our capitalized software balance would materially decrease and our expense would materially increase. 68 We determine the amount of internal-use software development costs to be capitalized based on the amount of time spent by our developers on projects.
For example, if we received information that indicated the useful life of all internally developed software was one year rather than three to five, our capitalized software balance would materially decrease and our expense would materially increase.
We expect this trend to continue, providing us with a greater opportunity to provide next-generation bill and digital payment technology and power more transactions, further fueling our growth.
We have observed that consumers demand a frictionless electronic bill payment experience and increasingly prefer more flexible and innovative digital payment options. We expect this trend to continue, providing us with a greater opportunity to provide next-generation bill and digital payment technology and power more transactions, further fueling our growth.
In addition, our modern platform architecture allows us to provide integration, implementation, maintenance and upgrades at no additional cost to billers. Impact of Economic and Inflationary Trends In 2022 and 2023, the United States economy experienced inflationary conditions, increased interest rates and consecutive quarters of decreased gross domestic product.
In addition, our modern platform architecture allows us to provide integration, implementation, maintenance and upgrades at no additional cost to billers. Impact of Economic and Inflationary Trends The United States economy experienced inflationary conditions in 2022 and 2023, with some moderation throughout 2024. Interest rates remained relatively stable in 2024, and were cut near the end of the year.
Net cash used in investing activities for the year ended December 31, 2023 consisted of $33.7 million of capitalized internal-use software development costs, and $0.6 million of purchases of property and equipment and intangible assets. 66 Net cash used in investing activities for the year ended December 31, 2022 consisted of $29.8 million of capitalized internal-use software development costs, $3.3 million of cash paid for acquisitions, net of cash acquired and $1.3 million of purchases of property and equipment and intangible assets.
Net cash used in investing activities for the year ended December 31, 2023 consisted of $33.7 million of capitalized internal-use software development costs and $0.6 million of purchases of property and equipment. Net Cash Used in Financing Activities Cash used in financing activities consists primarily of option exercises and payments related to holdback liabilities related to acquisitions.
Gross profit as a percentage of our revenue is referred to as gross margin. Our gross margin has been and will continue to be affected by a number of factors, including average transaction value, payment type and payments and transactions through our IPN.
Our gross margin has been and will continue to be affected by a number of factors, including addition of large, high-volume enterprise billers with lower margins in our biller mix, average transaction value, payment type and payments and transactions through our IPN.
The increase in 2022 was primarily driven by the addition of new billers and increased transactions from our existing billers. For 2022 and 2023, contribution profit increased at a slower rate than transactions processed due to a continued mix shift to larger, high volume clients.
For 2023 and 2024, contribution profit increased at a slower rate than transactions processed due to a continued mix shift to larger, high volume clients.
Complex arrangements with nonstandard terms and conditions may require significant contract interpretation to determine the appropriate accounting. Specifically, the determination of whether we are a principal to a transaction or an agent can require considerable judgment. We have concluded that we are typically the principal in our payment processing arrangements as we control the service on our platform.
Revenue Recognition Application of the accounting principles in GAAP related to the measurement and recognition of revenue requires us to make judgments and estimates. Complex arrangements with nonstandard terms and conditions may require significant contract interpretation to determine the appropriate accounting. Specifically, the determination of whether we are a principal to a transaction or an agent can require considerable judgment.
Net cash provided by operating activities for the year ended December 31, 2022 was $19.9 million, primarily consisting of our net loss of $0.5 million, adjusted for non-cash charges of $32.3 million consisting primarily of depreciation and amortization, non-cash lease expense related to our operating right-of-use assets, amortization of contract asset and stock-based compensation, which contributed positively to operating activities.
Net cash provided by operating activities for the year ended December 31, 2023 was $68.8 million. Net income was $22.3 million, adjusted for non-cash charges of $46.1 million consisting primarily of depreciation and amortization, stock-based compensation, amortization of capitalized contract acquisition costs and warrants cost, and non-cash lease expense, which contributed positively to operating activities.
Net Cash Used in Investing Activities Cash used in our investing activities consists primarily of cash paid for acquisitions, capitalized internal-use software development costs, purchases of property and equipment and intangible assets.
This was increased by net cash inflows of $0.4 million for changes in our operating assets and liabilities. Net Cash Used in Investing Activities Cash used in our investing activities consists primarily of cash paid for capitalized internal-use software development costs and purchases of property and equipment and change in interest-bearing deposits.
We expect that our general and administrative expenses will increase in absolute dollars, but they may fluctuate as a percentage of revenue from period to period. Over the longer 59 term, we expect general and administrative expenses to decrease as a percentage of revenue as we leverage the scale of our business.
This includes the transition from an emerging growth company to a large accelerated filer for SEC compliance. We expect that 59 our general and administrative expenses will increase in absolute dollars, but they may fluctuate as a percentage of revenue from period to period.
The critical accounting policies and estimates that we believe have the most significant impact on our consolidated financial statements are described below.
The critical accounting policies and estimates that we believe have the most significant impact on our consolidated financial statements are described below. See Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K for additional information.
Year Ended December 31, 2023 2022 2021 (in thousands) Net cash provided by (used in) Operating activities $ 68,828 $ 19,867 $ 19,493 Investing activities (34,299 ) (34,560 ) (77,809 ) Financing activities (1,195 ) (37,283 ) 213,487 Effects of foreign exchange on cash 176 (168 ) (8 ) Net increase in cash, cash equivalents and restricted cash $ 33,510 $ (52,144 ) $ 155,163 Net Cash Provided by Operating Activities Our primary source of operating cash is revenue from payment transaction fees.
Any future indebtedness we incur may result in terms that could be unfavorable to equity investors. 65 Historical Cash Flows The following table summarizes our consolidated cash flows: Year Ended December 31, 2024 2023 2022 (in thousands) Net cash provided by (used in) Operating activities $ 63,634 $ 68,828 $ 19,867 Investing activities (36,761 ) (34,299 ) (34,560 ) Financing activities (207 ) (1,195 ) (37,283 ) Effects of foreign exchange on cash (450 ) 176 (168 ) Net increase (decrease) in cash, cash equivalents and restricted cash $ 26,216 $ 33,510 $ (52,144 ) Net Cash Provided by Operating Activities Our primary source of operating cash is revenue from payment transaction fees.
A significant change in the time spent on each project could have a material impact on the amount capitalized and related amortization expense in subsequent periods. Valuation of Goodwill and Intangibles The valuation of assets acquired in a business combination and asset impairment reviews require the use of significant estimates and assumptions.
Valuation of Goodwill and Intangibles The valuation of assets acquired in a business combination and asset impairment reviews require the use of significant estimates and assumptions.
Net cash used in financing activities for the year ended December 31, 2022 consisted of a decrease in financial institution funds in-transit of $33.4 million, $5.3 million of payments on finance leases and other financing obligations, offset by proceeds of $1.5 million from the exercise of stock options.
Net cash used in financing activities for the year ended December 31, 2024 consisted of $0.5 million of payments related to holdback liabilities settlement offset by $0.3 million proceeds from the exercise of stock options.
See Note 4 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K for additional information regarding these acquisitions. 62 Adjusted EBITDA Year Ended December 31, 2023 2022 2021 (in thousands) Net income (loss) — GAAP $ 22,322 $ (513 ) $ 9,300 Interest income, net (7,019 ) (1,663 ) 6 Provision for (benefit from) income taxes 2,802 (795 ) 1,066 Amortization of capitalized software development costs 21,349 14,621 9,376 Amortization of acquisition-related intangibles 8,380 8,176 2,812 Depreciation 871 1,266 1,107 EBITDA 48,705 21,092 23,667 Adjustments Foreign exchange loss (gain) (12 ) (5 ) 1 Stock-based compensation 9,390 6,736 3,136 Other nonrecurring expense (1) — 769 2,711 Adjusted EBITDA $ 58,083 $ 28,592 $ 29,515 (1) Other nonrecurring expenses consists of indirect costs incurred associated with completion of our IPO in 2021 and an estimated liability booked in 2022 related to the cost of terminating a commercial contract.
The increase in amortization for 2024 and 2023 was driven by the additional capitalization of software costs. 62 Adjusted EBITDA Year Ended December 31, 2024 2023 2022 (in thousands) Net income (loss) — GAAP $ 44,169 $ 22,322 $ (513 ) Interest income, net (8,742 ) (7,019 ) (1,663 ) Other income (1) (213 ) — — Provision for (benefit from) income taxes 9,775 2,802 (795 ) Amortization of capitalized software development costs 27,586 21,349 14,621 Amortization of acquisition-related intangibles 8,081 8,380 8,176 Depreciation 817 871 1,266 EBITDA $ 81,473 $ 48,705 $ 21,092 Adjustments Foreign exchange gain (132 ) (12 ) (5 ) Stock-based compensation 12,855 9,390 6,736 Other nonrecurring expenses (2) — — 769 Adjusted EBITDA $ 94,196 $ 58,083 $ 28,592 (1) Other income consists of a remeasurement adjustment relating to the purchase price of a prior acquisition.
Costs associated with building or significantly enhancing our platforms are capitalized, while costs associated with planning new developments and maintaining our platform are expensed as incurred. There is judgment involved in estimating the stage of development as well as estimating time allocated to a particular project.
We determine the amount of internal-use software development costs to be capitalized based on the amount of time spent by our developers on projects. Costs associated with building or significantly enhancing our platforms are capitalized, while costs associated with planning new developments and maintaining our platform are expensed as incurred.
Factors Affecting Our Performance Increased Adoption of Electronic Bill Payment Solutions As the number of financial transactions online continues to increase, electronic bill payment is becoming a greater share of the bill payment market. We have observed that consumers demand a frictionless electronic bill payment experience and increasingly prefer more flexible and innovative digital payment options.
Over the longer term, we expect general and administrative expenses to decrease as a percentage of revenue as we leverage the scale of our business. Factors Affecting Our Performance Increased Adoption of Electronic Bill Payment Solutions As the number of financial transactions online continues to increase, electronic bill payment is becoming a greater share of the bill payment market.
We also serve financial institutions by providing them with a modern platform that their customers use for bill payment, account-to-account transfers and person-to-person transfers.
We serve billers of all sizes that primarily provide non-discretionary services across a variety of industry verticals, including utilities, financial services, insurance, government, telecommunications, real estate management, education, consumer finance, healthcare and small business. We also serve financial institutions by providing them with a modern platform that their customers use for bill payment, account-to-account transfers and person-to-person transfers.
Research and Development Expenses The increase in research and development expenses was primarily due to increased amortization cost of capitalized internal-use software development costs and acquired intangibles relating to our PROFIT acquisition, and an increase in employee-related costs, including benefits due to an increase in headcount as we continued to invest in developing and adding additional features and functionality to our platform.
Research and Development Expenses The increase in research and development expenses was primarily due to increased amortization of capitalized internal-use software development costs, an increase in employee-related costs, including an increase in stock-based compensation and an increase in subscription cost for operational third party services.
Net cash used in financing activities for the year ended December 31, 2023 consisted of $1.7 million of payments on other financing obligations, $0.1 million of payments on finance leases and $0.6 million proceeds from exercise of stock-based awards by employees.
Net cash used in financing activities for the year ended December 31, 2023 consisted of $1.7 million of payments on other financing obligations, $0.1 million of payments on finance leases, offset by $0.6 million proceeds from exercise of stock-based awards by employees. 66 Contractual Obligations and Other Commitments The following table summarizes our contractual obligations and commitments in cash as of December 31, 2024: Total Less than 1 Year 1 - 3 Years 3 - 5 Years More than 5 Years Operating lease liabilities (1) 9,046 2,424 3,833 1,853 936 Purchase obligations (2) 10,943 7,716 3,227 Other (3) 412 412 20,401 10,552 7,060 1,853 936 (1) Consists of operating lease liabilities for office space.
As adjusted EBITDA is a measure of profitability, it would generally be expected to move in line with revenue, contribution profit, gross profit and adjusted gross profit. Adjusted EBITDA increased 103.1% for the year ended December 31, 2023 compared to 2022 and decreased 3.1% for the year ended December 31, 2022 compared to 2021.
(2) Other nonrecurring expenses represent an estimated liability booked in 2022 related to the cost of terminating a commercial contract. As adjusted EBITDA is a measure of profitability, it is generally expected to move in line with revenue, contribution profit, gross profit and adjusted gross profit.
Income Taxes The change in benefit from (provision for) income taxes, as well as the decrease in our effective tax rate, which decreased to 11% for the year ended December 31, 2023 as compared to 60.8% for the same period in the prior year, was primarily due to the increase in pre-tax income from the prior year, which had the effect of causing rate impact items to have a lower percentage impact on the rate overall given the higher base of pre-tax income.
Income Taxes The change in provision for income taxes, as well as the increase in our effective tax rate, which increased to 18.1% for the year ended December 31, 2024 as compared to 11.2% for the same period in the prior year, was primarily due to an increase in taxable income after utilizing a significant amount of net operating losses (NOLs), which were previously subject to a full valuation allowance.
Other Income (Loss) The changes in other income (expense) were primarily due to the increase in interest income, net as a result of increases in the Federal Reserve rates which increased interest income on our cash held with the banks.
General and Administrative Expenses The marginal increase in general and administrative expenses was primarily due to increases in professional fees and legal fees, which were offset by lower cost of insurance premiums of certain business policies. Interest income, net The changes in interest income, net was a result of higher cash balances held with banks.
Our platform was used by approximately 34 million consumers and businesses in North America in December 2023 to pay their bills, make money movements and engage with our clients. We serve billers of all sizes that primarily provide non-discretionary services across a variety of industry verticals, including utilities, financial services, insurance, government, telecommunications, real estate management and healthcare.
Our platform was used by approximately 46 million consumers and businesses globally in December 2024 to pay their bills, make money movements and engage with our clients.
In addition, the lack of excess tax benefits on stock-based compensation, utilization of net operating losses and the valuation allowance recorded against the net U.S. deferred tax assets had the largest impact on the effective tax rate. 65 Liquidity and Capital Resources Sources and Uses of Funds As of December 31, 2023, we had $179.4 million of unrestricted cash and cash equivalents.
Additionally, the increase in our effective tax rate was influenced by permanent differences for disallowed stock-based compensation pursuant to IRC Section 162(m) and state taxes, which were partially offset by the release of the valuation allowance. Liquidity and Capital Resources Sources and Uses of Funds As of December 31, 2024, we had $205.9 million of unrestricted cash and cash equivalents.