Finance term
Section 174 R&D Capitalization
Also known as: Section 174, IRC Section 174, R&D capitalization, research and experimental expenditures, R&E amortization, TCJA R&D
Definition
Section 174 of the Internal Revenue Code governs the tax treatment of research and experimental (R&E) expenditures. A TCJA 2017 change required domestic R&E to be capitalized and amortized over 5 years (15 years for foreign R&E) for 2022-2024 — but the One Big Beautiful Bill Act (Pub. L. 119-21) restored immediate expensing for domestic R&E under new IRC Section 174A starting with tax years beginning after December 31, 2024. Foreign R&E is unaffected and still amortizes over 15 years.
Detailed explanation
Section 174 (IRC § 174, full text at irs.gov/pub/irs-drop/rp-23-08.pdf and govinfo.gov) has governed the tax treatment of research and experimental (R&E) expenditures since 1954. For nearly 70 years, companies could immediately deduct (expense) all R&E costs in the year incurred — a significant cash-flow benefit for R&D-intensive businesses. The Tax Cuts and Jobs Act of 2017 (TCJA, Pub. L. 115-97) amended IRC § 174 to require capitalization and amortization of R&E costs beginning January 1, 2022.
The TCJA change (2022-2024 tax years): domestic R&E expenditures were capitalized and amortized over 5 years using the midpoint convention (effectively 6 years for the first deduction year: 10% in Year 1, 20% in Years 2-5, 10% in Year 6); foreign R&E expenditures were capitalized and amortized over 15 years using the midpoint convention; software development costs were explicitly included in Section 174 by the TCJA and subject to the same amortization schedule.
The One Big Beautiful Bill Act (OBBBA, Pub. L. 119-21, signed 2025-07-04) reversed the domestic capitalization requirement: new IRC § 174A permanently restores the option to fully deduct domestic R&E costs in the year incurred, for tax years beginning after December 31, 2024 (taxpayers may instead elect to capitalize and amortize domestic R&E ratably over a period of their choosing, but not less than 60 months). Foreign R&E expenditures are unaffected by OBBBA and must still be capitalized and amortized over 15 years. Small business taxpayers (average annual gross receipts of $31 million or less) may elect to apply full expensing retroactively to tax years beginning after December 31, 2021 — effectively unwinding the 2022-2024 TCJA capitalization for those years. Larger taxpayers cannot elect retroactive treatment for 2022-2024 but have a one-time election to accelerate the remaining unamortized 2022-2024 domestic R&E balance, deducting it entirely in 2025 or split evenly between 2025 and 2026 (IRS Revenue Procedure 2025-28).
What counts as a Section 174 expenditure: the IRS defines R&E expenditures as amounts paid or incurred in connection with a trade or business for activities intended to discover information that is technological in nature and is useful in the development of a new or improved business component (proposed regulations at irs.gov/pub/irs-drop/reg-132569-17.pdf). This includes wages for R&D employees, contractor costs, overhead allocable to R&D activities, and certain supply costs — but NOT marketing research, social sciences research, or routine data collection.
Cash flow impact of the 2022-2024 rule: for a company spending $1M/year on domestic R&D that previously deducted 100% ($1M deduction), the TCJA-era rule meant only $100K was deductible in Year 1 — a $900K deferred deduction and potentially a $207,000+ current-year tax increase (assuming 23% effective rate). That cash-flow crunch, particularly acute for startups and small manufacturers, is the gap OBBBA's §174A closed for domestic R&E going forward. The IRS FAQs on the OBBBA transition are at irs.gov/newsroom/section-174-frequently-asked-questions.
◈ Worked example
- 2022-2024 domestic R&E (TCJA era): A software company incurred $500K in domestic R&D wages and contractor costs in 2023; under the TCJA capitalization rule, it deducted $100K in 2023 (20%, mid-schedule year), with the balance spread through 2029 — vs. a $500K immediate deduction pre-TCJA.
- 2025 and later (OBBBA/§174A): The same company spends $500K on domestic R&D in 2025 and can now deduct the full $500K immediately in 2025 under new IRC § 174A, rather than amortizing it.
- Small-business retroactive election: A manufacturer with $18M in average annual gross receipts (under the $31M threshold) elects to apply full expensing retroactively to 2022-2024, amending prior returns to deduct domestic R&E costs that had been capitalized under the TCJA rule.
- Foreign R&E is unaffected: A company with $200K in R&D performed at an overseas engineering office still capitalizes and amortizes that $200K over 15 years under Section 174, both before and after OBBBA — only domestic R&E gets the restored immediate deduction.
Common questions
The most-asked questions about Section 174 R&D Capitalization — answered straightforwardly.
Is Section 174 R&D capitalization still mandatory? +
Not for domestic R&E anymore. The TCJA's mandatory 5-year amortization applied to domestic R&E incurred in tax years 2022-2024. The One Big Beautiful Bill Act (signed 2025-07-04) created new IRC § 174A, which restores the option to fully deduct domestic R&E costs in the year incurred, for tax years beginning after December 31, 2024 — a taxpayer can still elect to capitalize and amortize instead (over a self-selected period of at least 60 months), but it's no longer required. Foreign R&E is not affected and must still be capitalized and amortized over 15 years.
Can I go back and recover the 2022-2024 amortized deductions? +
It depends on your size. Small business taxpayers — average annual gross receipts of $31 million or less — can elect to apply full expensing retroactively to tax years beginning after December 31, 2021, generally by amending returns or filing an accounting-method change. Larger taxpayers can't elect full retroactivity, but do get a one-time election to accelerate whatever domestic R&E balance is still unamortized from 2022-2024, deducting all of it in 2025 or splitting it evenly across 2025 and 2026 (Rev. Proc. 2025-28). Consult a qualified tax professional — the mechanics (amended return vs. Form 3115 accounting-method change) depend on your facts.
How does the Section 174/174A change affect a small business's ability to get financing? +
For 2022-2024 tax years, the TCJA capitalization rule could significantly reduce reported taxable income relief and squeeze cash flow for R&D-intensive small businesses even though cash spending didn't change — lenders using tax returns to underwrite (a common practice for SBA loans and bank term loans) sometimes saw higher tax liabilities on those returns. For 2025 forward, immediate domestic R&E expensing under §174A removes that mismatch going forward, though a business still catching up on a 2022-2024 amortization election may want to walk a lender through the transition with a bridge analysis. The SBA's operating income underwriting guidelines are at sba.gov/document/sop-50-10-sba-lender-and-development-company-loan-programs.
Further reading
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