OBBBA created new IRC §174A permanently restoring immediate domestic research and experimental (R&E) expensing for tax years beginning after December 31, 2024 - reversing TCJA's controversial requirement that businesses capitalize and amortize all R&D over 5 years (15 years for foreign). The fix is partial: foreign R&E expenditures must STILL be capitalized and amortized over 15 years under preserved §174. For domestic R&E, three options now exist: (a) immediate full deduction under §174A(a); (b) elective capitalization with ratable amortization over not less than 60 months under §174A(c); or (c) elective 10-year amortization under §59(e). Beyond the prospective fix, OBBBA provides TRANSITION RELIEF for previously-capitalized R&D from 2022-2024: ALL taxpayers (any size) may elect to deduct the remaining unamortized balance entirely in 2025 OR ratably over 2025 and 2026. Additionally, SMALL BUSINESS taxpayers meeting the §448(c) $31 million gross receipts test for their first tax year beginning after 12/31/2024 may make a "small business OBBBA election" to apply §174A RETROACTIVELY to 2022-2024 by amending those returns. Rev. Proc. 2025-28 (issued August 28, 2025) provides the procedural framework: for the 2025 method change to §174A, a statement in lieu of Form 3115 is permitted - simplifying compliance. The first-year method change and the unamortized-amount election are made on a cut-off basis with no §481(a) adjustment (OBBBA §70302(c)(1)(C), (f)(2)(B)(iii)). Small business retroactive elections had to be made by the earlier of July 6, 2026 OR the §6511 statute of limitations (that window has closed). BBA partnerships subject to centralized audit must file Administrative Adjustment Requests (AAR) rather than amended returns. §280C(c) conforming amendments require taxpayers to either reduce the §174A deduction by the §41 research credit OR elect a reduced research credit. State conformity varies: California (fixed 2015 conformity) already allowed expensing; rolling conformity states will follow federal; some decoupled states require separate analysis.
Track 1 - Going forward (all taxpayers): New §174A allows immediate domestic R&E deduction for tax years beginning after 12/31/2024. Statement in lieu of Form 3115 with 2025 return.
Track 2 - Acceleration of TCJA-era unamortized R&D (all taxpayers): Elect to deduct remaining unamortized 2022-2024 capitalized R&D entirely in 2025 OR ratably 2025-2026. Method change on a cut-off basis; no §481(a) adjustment.
Track 3 - Small business retroactive (≤$31M gross receipts): Amend 2022-2024 returns (or use the §7.02(3)(c) method change) to apply §174A retroactively. Deadline was the earlier of 7/6/2026 OR §6511 SOL (closed July 6, 2026).
Track 4 - Foreign R&D: STILL must capitalize over 15 years under §174 (no change).
§280C(c) coordination: Mandatory - reduce §174A deduction by §41 research credit OR elect reduced credit.
| Period | R&E Treatment |
|---|---|
| Pre-TCJA (2017 and prior) | Taxpayers could choose to deduct or capitalize R&E. §174 election; vast majority deducted immediately. |
| TCJA (tax years beginning after 12/31/2021) | FORCED capitalization: domestic R&E amortized over 5 years; foreign R&E over 15 years. Created cash flow crisis for R&D-heavy startups. |
| Effective period of TCJA rule | 2022, 2023, 2024 tax years (3 years of forced capitalization) |
| OBBBA effective date | Tax years beginning after 12/31/2024 (immediate expensing returns prospectively); retroactive option for small businesses |
| §174 retained | OBBBA amended §174 to continue requiring 15-year amortization for FOREIGN R&E only |
| Option | Authority | Mechanics |
|---|---|---|
| Immediate full deduction | §174A(a) | Deduct all domestic R&E in year paid or incurred. Default option absent election. |
| Elective 60-month minimum capitalization | §174A(c) | Capitalize and amortize ratably over a period not less than 60 months, beginning in month taxpayer first realizes benefit. Permanent election unless IRS consent for change. |
| Elective 10-year amortization | §59(e) | Capitalize and amortize ratably over 10 years starting year expenditure made. Annual election - more flexible. |
| Software development costs | §174A(d)(3) per OBBBA | Explicitly treated as qualifying R&E expenditures (clarifies post-Rev. Proc. 2000-50 uncertainty) |
All taxpayers - not just small businesses - may elect to ACCELERATE the deduction of unamortized domestic R&D capitalized during 2022-2024 under TCJA §174.
| Acceleration Option | Detail |
|---|---|
| One-year acceleration | Deduct ENTIRE remaining unamortized balance in the first tax year beginning after 12/31/2024 (typically 2025 for calendar-year taxpayers) |
| Two-year ratable acceleration | Deduct half in 2025 and half in 2026 - may help reduce estimated tax payments and balance multi-year tax position |
| Default (no election) | Continue amortizing remaining balance over original recovery period (5 years from year capitalized) |
| Method change required | Acceleration is an accounting method change made on a cut-off basis; no §481(a) adjustment (OBBBA §70302(f)(2)(B)(iii)) |
| Form 3115 waived | Statement in lieu of Form 3115 per Rev. Proc. 2025-28 §7.02(5)(a)(ii) |
| Election deadline | Due date of return (with extensions) for the tax year of method change |
| Coordinated with §174A method change | May file single statement covering BOTH the prospective change to §174A AND the acceleration of TCJA-era capitalized amounts |
| §163(j) impact | Rev. Proc. 2025-28 does not address how the unamortized-amount deduction is treated in ATI under §163(j) (it refers to §163(j)(3) only for small business taxpayer status); ATI treatment of the unamortized-amount deduction turns on the §163(j)(8)(A)(v) add-back for deductions allowable for depreciation, amortization, or depletion - confirm before relying on it |
Small business taxpayers meeting the §448(c) gross receipts test ($31M average annual gross receipts for the 3-year period ending with the tax year before the first tax year beginning after 12/31/2024) may elect to apply §174A RETROACTIVELY for tax years 2022-2024.
| Small Business Retroactive Election Requirement | Detail |
|---|---|
| §448(c) gross receipts test | ≤ $31,000,000 average annual gross receipts for the 3 prior taxable years (inflation-indexed; verify for current year) |
| Test year | First taxable year beginning after 12/31/2024 (typically 2025 for calendar-year) |
| Tax shelter exclusion | Tax shelter under §448(d)(3) NOT eligible - allocating more than 35% of losses to limited partners/passive owners may trigger tax shelter status |
| Aggregation rules | §448(c) aggregation under §52 (controlled groups) and §414(m)/(o) applies |
| Application | Applies to ALL taxable years beginning after 12/31/2021 in which taxpayer paid or incurred domestic R&E (i.e., 2022, 2023, 2024 if applicable) |
| Method 1 - Section 3.03 election | File the election statement entitled "FILED PURSUANT TO SECTION 3.03 OF REV. PROC. 2025-28" with the original return, or with the amended return or AAR, for each applicable year (Rev. Proc. 2025-28 §3.03(2)); amended returns reflect the §174A deduction. |
| Method 2 - Small business retroactive method change | For a taxable year beginning before 1/1/2025 whose original return is filed after 8/28/2025, change to the small business retroactive method under Rev. Proc. 2025-23 §7.02(3)(c), as modified by Rev. Proc. 2025-28; not available to a taxpayer that makes the §3.03 election (Rev. Proc. 2025-28 §3.04(2)). |
| Deadline | Earlier of July 6, 2026 (one year from OBBBA enactment 7/4/2025, technically 7/6/2026 per Rev. Proc. 2025-28) OR §6511 statute of limitations (window closed July 6, 2026) |
| BBA Partnership | Must file Administrative Adjustment Request (AAR) rather than amended return; tax effect flows to partners in year AAR filed |
Section 481(a) adjustment is the catch-up mechanism for accounting method changes. For taxpayers changing from TCJA §174 capitalization to §174A immediate expensing, however, the first-year change is made on a cut-off basis with no §481(a) adjustment; the remaining unamortized basis is recovered through the §70302(f)(2) election.
| §481(a) Mechanic | Detail |
|---|---|
| Computation | None for the first-year change (cut-off basis, OBBBA §70302(c)(1)(C)). A modified §481(a) adjustment applies only in limited cases, such as a year of change later than the first taxable year beginning after 12/31/2024 (Rev. Proc. 2025-28 §7.02(5)(b)(i)) |
| Unamortized 2022-2024 balance - taxpayer-favorable | Deducted by election in the first taxable year beginning after 12/31/2024, or ratably over the 2 taxable years beginning with that year, with no §481(a) adjustment (OBBBA §70302(f)(2)) |
| Recognition timing - Election in 2025 | One year (full remaining unamortized amount in the first taxable year beginning after 12/31/2024) OR ratably over that year and the next, by election |
| §163(j) interaction | Rev. Proc. 2025-28 does not address §163(j); model the ATI effect under §163(j)(8)(A)(v) (add-back of deductions allowable for depreciation, amortization, or depletion) and confirm treatment of the unamortized-amount deduction |
| NOL interaction | Large §481(a) deductions may generate NOL; OBBBA preserves §172 80% taxable income limit for post-2017 NOLs |
| Estimated tax impact | Accelerated deduction of the unamortized amount may dramatically reduce 2025 tax liability; reduce estimated payments to avoid overpayment |
| Rev. Proc. 2025-28 Provision | Detail |
|---|---|
| Statement in lieu of Form 3115 | For method change to §174A in first tax year beginning after 12/31/2024, taxpayer may file a STATEMENT with the return rather than Form 3115 (significantly simpler) |
| No duplicate copy required | Form 3115 normally requires duplicate copy to IRS Ogden office; not required for §174A statement |
| Audit protection | Some method changes under Rev. Proc. 2025-28 receive automatic audit protection; others do not - verify per change type |
| Multiple changes single statement | Single statement may cover (a) change from TCJA §174 to §174A AND (b) acceleration of unamortized 2022-2024 amounts |
| Section 7.02(5)(a)(ii) | Specifies required information for statement (name and taxpayer identification number, DCN, cut-off declaration, and the method or recovery-of-unamortized-amount declarations) |
| Section 3.03(2) | Election statement ("FILED PURSUANT TO SECTION 3.03 OF REV. PROC. 2025-28") for the small business retroactive election, attached to the original or amended return or AAR |
| Section 7.02(3)(c) | Automatic method change procedures for small business retroactive application |
| Section 280C(c) late election | OBBBA permitted late §280C(c)(2) elections or revocations on amended returns filed during the one-year period beginning 7/4/2025 (through Monday, July 6, 2026; now closed) |
| Effective date | August 28, 2025 generally; taxpayers may rely on Rev. Proc. 2025-28 immediately |
| Superseding return relief | Taxpayers who timely filed 2024 returns before 9/15/2025 receive automatic extension to file superseding return to retroactively apply §174A |
Section 280C(c) prevents double benefit - taxpayers cannot both deduct R&D and claim full research credit for the same expenditures. OBBBA conformed §280C(c) to §174A.
| §280C(c) Option | Effect |
|---|---|
| Reduce §174A deduction by research credit | Default - taxpayer deducts R&E less research credit amount; full §41 credit claimed |
| §280C(c)(2) election - reduced credit, full deduction | Elect reduced research credit (currently ~21% reduction = 79% of full credit); preserves full §174A deduction |
| Application year-by-year | Annual election under §280C(c)(2); must be on originally-filed return historically; OBBBA permitted late election/revocation through 7/6/2026 (now closed) |
| Retroactive small business | Small business taxpayers retroactively applying §174A MUST also retroactively conform §280C(c) treatment - either reduce R&E by credit or claim reduced credit |
| State tax interaction | State R&D credits may have different §280C-style rules - federal election does not auto-conform to state |
Partnerships subject to the Bipartisan Budget Act of 2015 centralized audit regime (BBA partnerships) cannot file regular amended returns. To retroactively apply §174A, BBA partnerships must file Administrative Adjustment Requests (AAR) under §6227.
| AAR Aspect | Detail |
|---|---|
| Form | Form 8082 (Notice of Inconsistent Treatment or Administrative Adjustment Request) |
| Effective date of adjustment | Adjustment effective in reviewed year (e.g., 2022, 2023, or 2024) |
| Tax effect timing | Tax effect of adjustment flows to REVIEWED-YEAR PARTNERS based on their reviewed-year shares |
| Partner tax year | Partner reports the adjustment on their return for the year in which the AAR is FILED (typically 2025 or 2026), NOT the reviewed year |
| Push-out elections | BBA partnerships may make push-out election under §6226 - adjustments imputed at partner level |
| Strategic timing | Partnerships should coordinate AAR filing with partner tax positions; adjustments cannot be "trapped" at partnership level |
| Departed partners | Reviewed-year partners may no longer be partners - careful coordination required |
| State Conformity Pattern | R&D Treatment |
|---|---|
| California (fixed conformity to IRC 1/1/2015) | Already allows immediate R&D expensing - never required TCJA §174 capitalization. State unchanged by OBBBA. |
| Rolling conformity states | Generally conform to §174A automatically |
| Static conformity states | Depends on whether state has updated to post-OBBBA Code |
| Decoupled states | May require separate state R&D treatment regardless of federal |
| State R&D credits | Many states offer their own R&D credits with different §280C-style rules - federal election does not auto-conform to state |
| Texas franchise tax | Margin tax conforms generally to federal; R&D expensing under §174A reduces taxable margin |
OBBBA amended §41(d) to explicitly link qualified research expenditures to amounts treated as domestic R&E under new §174A. This ensures credit eligibility aligns with the new expensing framework.
| §41 Research Credit Aspect | Post-OBBBA Treatment |
|---|---|
| Qualified research expenses (QRE) | Tied to §174A domestic R&E for credit eligibility |
| Foreign research | Excluded from §41 credit (consistent with §174 15-year foreign rule) |
| Section 174A(c) elective capitalization | Still eligible for §41 credit on capitalized amounts |
| Refund claim requirements (Notice 2023-50) | R&D credit refund claims postmarked after June 18, 2024 require detailed business component identification, research activities described, and supporting docs |
| Documentation requirements | Component-level documentation, contract research substantiation, supplies and wages allocation - critical for audit defense |
| Payroll tax offset (§3111(f)) | Qualifying small businesses can use up to $500,000 of R&D credit against payroll tax |
Facts: XYZ Inc. (C-corp, calendar year). 2022-2024 average annual gross receipts = $20,000,000 (under $31M test). $2,000,000 domestic R&E paid each year 2022, 2023, 2024 (capitalized over 5 years under TCJA §174). 2025 R&E: $2,500,000.
Without retroactive election (default per TCJA):
2022: $200K deducted ($2M / 5 years × half-year convention).
2023: $600K deducted ($400K for the 2022 spend + $200K half-year amount for the 2023 spend).
2024: $1,000K deducted ($400K + $400K + $200K half-year amount for the 2024 spend). Cumulative 2022-2024: $1,800K; unamortized balance at 12/31/2024: $4,200K.
2025 (post-OBBBA): $2.5M new full deduction PLUS acceleration of unamortized 2022-2024 amounts.
With retroactive election under Rev. Proc. 2025-28:
Amend 2022, 2023, 2024 returns. Deduct full $2,000,000 of domestic R&E in EACH amended year. Generate refunds for over-paid taxes 2022-2024.
2025: Deduct full $2,500,000 immediately. No §481(a) adjustment needed (since prior years already amended).
Deadline: Earlier of 7/6/2026 OR §6511 SOL on each year. Coordinate §280C(c)(2) elections for each year.
Cash flow benefit: Roughly $4,200,000 of additional 2022-2024 deductions ($6,000,000 less $1,800,000 amortized) × 21% C-corp rate = $882,000 of refunds (plus any state benefit); this offsets deductions that would otherwise be taken in 2025 or 2025-2026 under the unamortized-amount election.
The §448(c) test is for the FIRST tax year beginning after 12/31/2024 (typically 2025). The test uses average gross receipts for the 3 prior years (2022-2024). Some practitioners apply the test for the year of retroactive amendment - that's wrong. Test once, in 2025.
Retroactive §174A application MUST be accompanied by retroactive §280C(c) coordination. Either reduce R&E by credit amount in each amended year OR make §280C(c)(2) election (OBBBA late election relief was available through 7/6/2026 and has closed).
Rev. Proc. 2025-28 permits statement in lieu of Form 3115 for the §174A method change. Filing full Form 3115 (with duplicate copy to IRS Ogden) is unnecessary and adds compliance burden.
BBA partnerships cannot amend - must use AAR (Form 8082). Filing a regular amended Form 1065 for a BBA partnership is invalid.
Small business retroactive election deadline: earlier of 7/6/2026 OR §6511 SOL. For 2022 returns, §6511 SOL generally expires 4/15/2026 (3 years from original due date) - earlier than 7/6/2026. Practitioners must use the EARLIER deadline.
OBBBA §174A applies ONLY to domestic R&E. Foreign R&E remains subject to 15-year amortization under preserved §174. Practitioners with multinational clients must segregate domestic vs foreign and apply different rules.
OBBBA clarified that software development is qualifying R&E expenditure. Pre-OBBBA Rev. Proc. 2000-50 confusion is resolved - software development falls within §174A.
Rev. Proc. 2025-28 does not address how the acceleration of TCJA §174 amounts is treated for §163(j) ATI; see §163(j)(8)(A)(v). OBBBA made §163(j) EBITDA add-back permanent. Higher amortization deductions affect business interest deduction limit - model both.
§448(d)(3) defines tax shelter to include syndicates allocating more than 35% of losses to limited partners. Some R&D-heavy startups may inadvertently be tax shelters - disqualifying small business retroactive election. Analyze loss allocations carefully.
California (fixed conformity) already allowed expensing - no state change. But rolling conformity states automatically conform; static conformity states may not. State R&D credits have separate §280C-style rules. Federal §280C(c)(2) election does NOT auto-flow to state.
OBBBA §174A applies to DOMESTIC R&E only. Foreign R&E remains under preserved §174 with 15-year amortization. Mixed-jurisdiction R&D requires careful allocation.
AAR filed in 2025 pushes adjustments to partners' 2025 returns. AAR filed in 2026 pushes to 2026. If reviewed-year partners departed, the pushed-out adjustment still goes to those reviewed-year partners (§6227(b)(2)). Strategic timing matters.
Post-Notice 2023-50, R&D credit refund claims need detailed component-level documentation. Practitioners filing retroactive §174A elections paired with R&D credits face heightened documentation requirements.
Primary authority: IRC §174 (research or experimental expenditures - retained for foreign R&E only post-OBBBA; 15-year amortization for foreign R&E continues). §174A (NEW under OBBBA - domestic R&E expensing for tax years beginning after 12/31/2024). §174A(a) (immediate full deduction). §174A(c) (elective capitalization with not less than 60-month amortization). §174A(d)(3) (software development expressly qualifying). §59(e) (10-year amortization election - alternative). §41 (Credit for increasing research activities - research credit). §41(d) (qualified research expenses - linked to §174A domestic R&E by OBBBA). §280C(c) (denial of double benefit for research expenses). §280C(c)(2) (election to reduce credit and preserve full deduction). §481(a) (adjustments required by changes in method of accounting). §481(a)(2) (catch-up adjustment). §448 (limitation on use of cash method). §448(c) ($31 million gross receipts test - small business taxpayer definition; inflation-indexed). §448(d)(3) (tax shelter exclusion - syndicate with more than 35% of losses allocated to limited partners). §52 (controlled group aggregation for §448(c)). §414(m)/(o) (affiliated service group aggregation). §6227 (Administrative Adjustment Requests under BBA centralized partnership audit regime). §6226 (push-out elections). §6511 (statute of limitations on refund claims - generally 3 years from return filing or 2 years from tax payment). §172 (NOL - 80% taxable income limit preserved by OBBBA for post-2017 NOLs). §163(j) (business interest limitation - EBITDA ATI made permanent by OBBBA; §163(j)(8)(A)(v) adds back deductions allowable for depreciation, amortization, or depletion). §3111(f) (payroll tax offset for qualifying small business R&D credit). One Big Beautiful Bill Act, P.L. 119-21, signed July 4, 2025. OBBBA §70302 (R&D expensing under §174A; foreign R&E continued capitalization; conforming amendments to §41 and §280C(c); transition rules for 2022-2024 capitalized amounts; small business retroactive election). Revenue Procedure 2025-28 (issued August 28, 2025 - 61-page procedural guidance for implementing §174A; statement in lieu of Form 3115; automatic method change procedures; small business retroactive election under §3.03(2); acceleration of unamortized TCJA §174 amounts under §7.02(3)(d); §280C(c) coordination; superseding return relief; effective 8/28/2025). Form 3115 (Application for Change in Accounting Method). Form 8082 (Notice of Inconsistent Treatment or Administrative Adjustment Request - for BBA partnerships). Form 6765 (Credit for Increasing Research Activities). Form 4562 (Depreciation and Amortization). Notice 2023-50 (refund claim documentation requirements). Bipartisan Budget Act of 2015 (centralized partnership audit regime).