Section 174 R&D Capitalization in 2026: What Software Founders Owe and Why

What is section 174 capitalization?

Section 174 capitalization is the federal income-tax rule, in effect since tax years beginning after December 31, 2021, that requires every US taxpayer to capitalize research and experimental expenditures rather than deducting them in the year paid[1]. The amendment was tucked into the Tax Cuts and Jobs Act of 2017 with a five-year deferred effective date, on the theory that Congress would later replace it with a permanent immediate-expensing regime. That follow-on legislation has not arrived as of May 2026[2].

The mechanical effect: an expense that would have been deducted at $1 in year one under pre-2022 law is now spread over 5 years (domestic) or 15 years (foreign) under a mid-year convention. Year one's deduction is 10 percent of the domestic spend (half of one-fifth under the mid-year convention) or roughly 3.33 percent of foreign spend (half of one-fifteenth). The remaining basis amortizes evenly over the remaining years. The full benefit eventually flows through, but the year-one cash-flow impact for a previously-expensing taxpayer is large.

Why does section 174 hit software founders hardest?

The asymmetric impact on software companies comes from two sources. First, §174's definition of "research and experimental expenditures" explicitly includes software development; pre-TCJA Rev Proc 2000-50 had given software companies a choice between current expensing under §174(a) and capitalization under §174(b), and most chose current expensing[3]. The TCJA amendment removed the choice. Every software company that had been current-expensing developer salaries was now required to capitalize.

Second, developer compensation is the dominant cost line for most software businesses. A SaaS company with $2M of revenue and a five-person engineering team paying out $1.5M in salaries has $1.5M of newly-capitalized R&E expenditures. Under the mid-year convention, only $150,000 is deductible in year one (10 percent). The remaining $1.35M sits as a basis to be amortized over the next 4.5 years.

The taxable income shock is approximately $1.35M; at the 21 percent C-corp rate the tax bill is roughly $283,500 higher than it would have been under pre-2022 law. Bootstrapped companies that were running near cash-break-even found themselves owing taxes that exceeded their actual cash on hand.

Section 174 legislative timeline 2017 to 2026

1. Dec 2017
   TCJA enacted with deferred §174 capitalization
   TCJA §13206 amends IRC §174 to require capitalization, but defers the effective date to tax years beginning after Dec 31, 2021, on the assumption Congress would replace the rule before it took effect.
2. Jan 2022
   §174 capitalization takes effect
   No replacement legislation has passed. The capitalization regime activates for tax years beginning after Dec 31, 2021. Software companies file their first §174-affected returns in 2023.
3. Sep 2023
   IRS Notice 2023-63 provides implementation guidance
   The IRS issues comprehensive guidance on §174 implementation, including clarification that software development is in scope, definitions of "qualified" R&E activities, and treatment of contract research[4].
4. Jan 2024
   House passes Tax Relief for American Families and Workers Act
   HR 7024 passes the House 357-70 with a provision restoring immediate expensing for domestic R&E retroactively to 2022 and through 2025. Bill goes to Senate[5].
5. 2024-2025
   Senate fails to advance HR 7024
   HR 7024 stalls in the Senate without floor action. Subsequent attempts to attach the §174 fix to year-end legislative vehicles also fail.
6. 2025-2026
   Successor bills continue to circulate
   New bills with §174 immediate-expensing provisions, often paired with other TCJA extenders, continue to be introduced. None has reached the President's desk as of May 2026. Verify against congress.gov before relying on a fix.

How does the amortization mechanically work?

The §174 capitalization formula is mechanical but precise. Identify total R&E expenditures for the year, split domestic vs foreign, apply the appropriate amortization period (5 years domestic, 15 years foreign) under a mid-year convention, and compute the deductible amount.

Domestic R&E example. A company spends $1,000,000 on US-based developer salaries and engineering contractors in tax year 2026. Domestic amortization is straight-line over 5 years (60 months). The mid-year convention treats all 2026 expenditures as occurring mid-year, so 2026 gets half a year of amortization. Year 2026 deduction: $1,000,000 / 5 years × 0.5 = $100,000. Years 2027-2030 each get a full $200,000 deduction. Year 2031 gets the final $100,000 to close out the asset.

Foreign R&E example. Same company also spends $500,000 on Romania-based contractors. Foreign amortization is straight-line over 15 years (180 months) with the mid-year convention. Year 2026 deduction: $500,000 / 15 × 0.5 = approximately $16,667. Years 2027-2040 each get $33,333. Year 2041 closes out.

The mid-year convention is per-expenditure, not per-year. Expenditures incurred in a later year start their own amortization clock, also under the mid-year convention. The result is that a company with ongoing R&E develops a "layered" amortization schedule that compounds over time. By year 5 of consistent annual R&E spending, the steady-state deductible amount catches up to roughly 100 percent of the annual spend for domestic R&E; for foreign R&E the catch-up takes 15 years.

How does the R&D tax credit interact with §174?

The R&D tax credit at IRC § 41 is the partial counter-weight to §174 capitalization, and it remains in force. Where §174 forces capitalization of R&E, § 41 provides a credit equal to roughly 6 to 14 percent of qualified research expenses in excess of a base amount, depending on the credit method chosen[6].

The interaction between §174 and § 41 is governed by IRC § 280C(c). The default rule reduces the §174-capitalized basis by the amount of the § 41 credit claimed. The alternative is a § 280C(c) election to take a reduced credit (currently 79 percent of the gross credit) and avoid the basis reduction. For most companies, the reduced-credit election preserves more long-term value because the un-reduced basis amortizes over multiple years while the credit is immediate.

The credit also has a payroll-tax offset available for qualified small businesses (broadly: less than 5 years of gross receipts and current-year gross receipts under $5M), which can offset up to $500,000 per year of employer-side payroll tax. For pre-revenue startups with no income-tax liability, the payroll-tax offset is the main path to monetizing the credit and a meaningful cash-flow lever[7].

What founders are actually doing in 2026

The four-year-and-counting absence of a legislative fix has pushed operators to a small set of pragmatic moves. None of them eliminates the §174 hit; they manage cash-flow around it.

Filing accounting-method-change requests. Companies that filed 2022 returns without §174 capitalization, or that want to clean up methodology in light of Notice 2023-63, file Form 3115 under Rev Proc 2023-11 (or its successors) to formally adopt the §174 method. The procedure is automatic-consent and does not require IRS pre-approval[8].

Aggressive R&D credit studies. The §41 credit is the dominant offset. Companies that previously skipped credit studies because the deduction was "good enough" are now hiring credit specialists to maximize the credit, recovering 20 to 35 percent of the §174 cash hit depending on activity mix.

Onshoring development. Companies with mixed domestic-and-foreign development have begun shifting work to US-based developers where the 5-year amortization is materially better than the 15-year foreign rule. The decision is real-cost driven (US developer rates vs. foreign), not pure tax optimization, but the §174 multiplier has changed the math.

Quarterly cash management. Operators who were running with thin cash reserves have built up tax reserves dedicated specifically to the §174-amplified estimated payments, treating §174 like an extra payroll-tax layer rather than a true income tax. The discipline matters most for bootstrapped operators whose accountant did not flag §174 until the late-Q1 tax-planning meeting.

Common §174 failure modes

Bottom line

Section 174 capitalization is the largest unfixed tax pothole for US software founders in 2026, and the legislative fix that everyone expected to land in early 2024 has not materialized. The mechanical impact is straightforward: 5-year domestic amortization, 15-year foreign amortization, mid-year convention, software development explicitly in scope. The financial impact for a bootstrapped, profitable software company can exceed actual cash profit in year one of the rule's application.

The practical moves are also clear: file accounting-method-change requests under Rev Proc 2023-11 to clean up methodology, run an aggressive §41 R&D credit study to offset what §174 takes, elect §280C(c) reduced credit to preserve §174 basis, calendar the credit and election dates with the return, and build tax reserves that anticipate §174 as a recurring cash-flow line. If a retroactive fix passes, amend back to recover; until then, plan and pay as if the rule is here to stay.

For pre-revenue startups, the § 41 credit's payroll-tax offset election (up to $500,000 per year for qualified small businesses) is the only meaningful monetization path and should be claimed even when there is no income-tax liability to offset.

1. Internal Revenue Code, 26 U.S.C. § 174 (current text, as amended by TCJA §13206). law.cornell.edu/uscode/text/26/174. return
2. Joint Committee on Taxation, General Explanation of Public Law 115-97 (TCJA Bluebook), JCS-1-18, Dec 2018, pp. 209-212 (R&E capitalization). jct.gov/publications/2018/jcs-1-18. return
3. Internal Revenue Service, Rev Proc 2000-50 (now superseded for software-development treatment). return
4. Internal Revenue Service, Notice 2023-63, Application of Section 174 Capitalization Rules to Specified Research or Experimental Expenditures, Sep 8, 2023. irs.gov/pub/irs-drop/n-23-63. return
5. U.S. House of Representatives, HR 7024 (Tax Relief for American Families and Workers Act of 2024), passed House Jan 31, 2024. congress.gov/bill/118th-congress/house-bill/7024. return
6. Internal Revenue Code, 26 U.S.C. § 41 (research credit). law.cornell.edu/uscode/text/26/41. return
7. Internal Revenue Code, 26 U.S.C. § 41(h) (payroll-tax offset for qualified small businesses). return
8. Internal Revenue Service, Rev Proc 2023-11 (and subsequent updates), automatic consent for §174 accounting-method changes. return