IRC 174A Research and Experimental Expenditures: Immediate Domestic R&D Expensing Under OBBBA, Rev. Proc. 2025-28, and Section 41 Credit Coordination

OBBBA (signed July 4, 2025) enacted IRC 174A to provide immediate 100% deductibility for domestic specified research or experimental expenditures, ending the three-year run of mandatory amortization that the Tax Cuts and Jobs Act of 2017 imposed through its amendments to IRC 174. For the enrolled agent, CPA, or tax attorney advising an R&D-intensive client, IRC 174A introduces a new deduction, a new accounting method change procedure, a rebuilt Section 41 credit interaction, and a fragmented state tax landscape where several major states have declined to conform.

This guide works through each layer in practitioner sequence: what IRC 174A does and why it differs from prior law; the Rev. Proc. 2025-28 method change procedure (including the now-closed retroactive catch-up window); what costs qualify as specified research or experimental expenditures; the Section 41 credit and Section 280C(c)(3) election analysis; the state conformity landscape; and common planning considerations. All specifics are hedged to IRC 174A, IRC 174 as amended by the TCJA, Rev. Proc. 2025-28, the applicable Section 41 and 280C(c) provisions, current Form 6765 instructions, and current IRS.gov guidance. Confirm each item before reliance in any client matter.

Section 1: What IRC 174A Does and Why It Matters

The TCJA Shock: Mandatory Capitalization from 2022 Through 2024

Before the Tax Cuts and Jobs Act of 2017 (TCJA), IRC 174 allowed taxpayers to deduct research and experimental (R&E) expenditures in the year paid or incurred, or to elect capitalization and amortization over a period of not less than 60 months. Most R&D-intensive companies took the immediate deduction. The TCJA amended IRC 174 to eliminate that choice for taxable years beginning after December 31, 2021: starting in 2022, all domestic R&E expenditures had to be capitalized and amortized over 5 years (mid-year convention), and all foreign R&E expenditures over 15 years. There was no election out.

The practical effect for technology companies, life sciences firms, specialty manufacturers, and engineering businesses was a significant increase in cash taxes starting in 2022. A company that previously deducted $10 million in annual R&E expenses immediately could now deduct only $1 million in the first year under the mid-year convention (one-tenth of a 5-year schedule), with the remaining $9 million spreading across years 2 through 6. Multiplied over three years (2022, 2023, and 2024) of mandatory capitalization, companies built up large pools of unamortized R&E basis. Industry pressure to reverse the TCJA's IRC 174 changes was sustained and ultimately produced OBBBA.

OBBBA Response: IRC 174A Immediate Domestic Deduction

OBBBA, signed July 4, 2025, enacted IRC 174A as a new code section. IRC 174A provides an immediate 100% deduction for domestic specified research or experimental expenditures paid or incurred in taxable years beginning after December 31, 2024. The structure of the change is important for practitioners: OBBBA created IRC 174A as a new provision; it did not repeal the TCJA amendments to IRC 174. Both sections exist in the code for their respective periods. For taxable years beginning after December 31, 2024, IRC 174A governs domestic R&E. IRC 174 as amended by the TCJA continues to govern prior-period years and foreign R&E. Hedge all specifics to IRC 174A as enacted by OBBBA and IRS.gov; confirm how the two provisions interact at the regulation level with current IRS.gov guidance.

Who Benefits Most from IRC 174A

IRC 174A is most impactful for domestic R&D-intensive businesses: technology and software companies with substantial employee compensation tied to product development; pharmaceutical and life sciences companies with clinical research and laboratory expenses; specialty manufacturers investing in new product lines, materials, and process improvements; and engineering firms developing proprietary techniques or designs. For these clients, IRC 174A converts what was a multi-year deduction stream under TCJA's IRC 174 into a current-year deduction, improving both current-year taxable income reduction and cash flow. Foreign-research-heavy companies benefit less because their foreign R&E remains on the 15-year amortization schedule.

Section 2: Prior Law Under IRC 174 (TCJA)

Mandatory Capitalization: 2022 Through 2024

IRC 174 as amended by the TCJA required taxpayers to capitalize and amortize specified research or experimental expenditures paid or incurred in taxable years beginning after December 31, 2021. The amortization periods are:

• Domestic R&E (within the United States): 5-year amortization, beginning with the midpoint of the taxable year in which the expenditure is paid or incurred (the mid-year convention).
• Foreign R&E (outside the United States): 15-year amortization, also with the mid-year convention.

Cite IRC 174 as amended by the TCJA for these amortization periods. The mid-year convention means that in the first tax year, only one-tenth of the annual domestic deduction (one year's worth divided by two for the mid-year convention on a 5-year life) is deductible: effectively 10% of the capitalized domestic R&E in year one for a calendar-year taxpayer.

Impact on 2022-2024 Returns

For taxpayers that had historically deducted R&E expenses immediately under pre-TCJA IRC 174, transitioning to capitalization for 2022 required reversing prior-method deductions and adding back previously deducted amounts under the prior-year IRC 174 method. Returns for 2022, 2023, and 2024 were filed (or should have been filed) reflecting the capitalized R&E base, with amortization deductions under the TCJA schedule. Companies that failed to apply TCJA's IRC 174 amortization rules to their 2022 through 2024 returns may have tax exposure or understatement issues to address. Hedge all computation specifics and any correction procedures to current IRS.gov guidance and applicable statute of limitations considerations.

Why Prior Law Matters for the IRC 174A Transition

The significance of the 2022-2024 mandatory capitalization period does not end with OBBBA's enactment of IRC 174A. Taxpayers who capitalized R&E expenditures under IRC 174 during those three years accumulated unamortized basis, and a portion of each year's R&E pool remains unamortized as the taxpayer transitions to IRC 174A for 2025. Rev. Proc. 2025-28 addressed how to handle that accumulated unamortized basis, including a catch-up adjustment mechanism whose retroactive window has now closed (see Section 3). The larger the 2022-2024 R&E capitalization base, the more significant the Rev. Proc. 2025-28 planning question was for that taxpayer.

Section 3: Rev. Proc. 2025-28 -- Accounting Method Change

Rev. Proc. 2025-28 provides the procedures for taxpayers to change their accounting method from IRC 174 amortization (prior law) to IRC 174A immediate expensing (current law). Practitioners advising clients on the transition to IRC 174A must work through Rev. Proc. 2025-28 for the method change. For detailed Form 3115 mechanics and procedure, see the Form 3115 OBBBA Accounting Method Change Practitioner Guide.

Automatic Consent Method Change: Form 3115

Rev. Proc. 2025-28 establishes an automatic consent procedure -- meaning no advance IRS permission is required -- for taxpayers to change from the IRC 174 amortization method to the IRC 174A immediate expensing method. The change is effectuated by filing Form 3115 (Application for Change in Accounting Method) with the taxpayer's timely filed return (including extensions) for the first taxable year beginning after December 31, 2024. Hedge all Form 3115 filing requirements (including attachment requirements, designation of change number, and the required information in Part I and Part II) to the full text of Rev. Proc. 2025-28 and current Form 3115 instructions available at IRS.gov.

The IRC 481(a) Catch-Up Adjustment

When a taxpayer changes an accounting method under IRC 481(a), an adjustment is required to prevent amounts from being omitted or duplicated as a result of the change. Rev. Proc. 2025-28 permitted a favorable IRC 481(a) adjustment: for taxpayers who capitalized R&E expenditures under TCJA's IRC 174 in taxable years beginning in 2022, 2023, or 2024, the unamortized balance of those prior capitalizations could be deducted as a one-time catch-up deduction in the first taxable year beginning after December 31, 2024 (the year of change). This represented a potentially large deduction for companies that had accumulated three years of partially-amortized R&E basis.

Hedge all computation mechanics for the 481(a) adjustment to the full text of Rev. Proc. 2025-28 and IRS.gov. The Rev. Proc. specifies how to identify and calculate the unamortized balance, how to present the adjustment on Form 3115, and any limitations on the adjustment. Do not compute or state a specific dollar methodology without confirming against the full Rev. Proc. text.

Prospective Method Change for 2025 and Later Taxable Years

For taxpayers transitioning to IRC 174A for the first taxable year beginning after December 31, 2024, Rev. Proc. 2025-28's automatic consent procedure for the prospective method change remains operative. The IRC 481(a) adjustment for the prospective change reflects only the difference between what was deducted under the old method (TCJA amortization) and what would have been deducted under the new method (IRC 174A immediate expensing) in prior years, computed under the standard IRC 481(a) methodology. Hedge the specific computation approach and any spread period for the adjustment to Rev. Proc. 2025-28 and IRS.gov.

Practical Steps for the Rev. Proc. 2025-28 Transition

• Pull each year's R&E capitalization schedules for 2022, 2023, and 2024 and identify domestic versus foreign R&E (only domestic is eligible for IRC 174A).
• Determine the unamortized balance of domestic R&E for each prior year; this is the starting point for the IRC 481(a) analysis under Rev. Proc. 2025-28 (for the prospective change going forward).
• Confirm the filing deadline for the Form 3115 (attached to the timely-filed return, including extensions, for the first taxable year beginning after December 31, 2024). Hedge to Rev. Proc. 2025-28 and IRS.gov for the precise deadline and any filing instructions.
• Prepare Form 3115, including the description of the method change, the IRC 481(a) adjustment amount, and the year and amount of prior capitalizations. Review current Form 3115 instructions and Rev. Proc. 2025-28 for required attachments and designated change number.
• Note separately the impact of the IRC 174A deduction on the Section 41 credit computation (see Section 5) and state tax addback requirements (see Section 6).

Section 4: What Qualifies as Specified Research or Experimental Expenditures

The Experimental or Laboratory Sense Standard

IRC 174A applies to expenditures paid or incurred in connection with the taxpayer's trade or business that represent research and development costs in the experimental or laboratory sense. The core test is whether the expenditure is intended to discover information useful in developing a new or improved product, formula, invention, or technique, and whether there is an element of uncertainty in the development process that the expenditure is intended to resolve. This standard tracks the longstanding definition that applied to IRC 174 before the TCJA and that has been developed through decades of Treasury regulations, revenue rulings, and Tax Court decisions. Hedge the precise statutory definition under IRC 174A, including any modifications the OBBBA text may have made to the prior definition, to IRC 174A and current IRS.gov guidance.

Expenditures That Generally Qualify

Based on the longstanding experimental-or-laboratory-sense standard (hedge the specific application under IRC 174A to IRS.gov and applicable guidance), expenditures that have historically qualified for treatment as R&E costs include:

• Wages and salaries paid to employees engaged in qualifying research activities.
• Costs of supplies used or consumed in the research process.
• Amounts paid to third-party contractors for research performed on behalf of the taxpayer (contracted research expenses, subject to the Section 41 funded research rules if claiming the credit).
• Clinical trial costs and testing costs where the purpose is to develop or improve a product or process (hedge pharmaceutical clinical costs to current IRS guidance under IRC 174A).
• Costs of pilot models and prototypes where the purpose is to resolve uncertainty in product development (hedge to IRC 174A and IRS.gov; the treatment of pilot models has been subject to specific guidance).

Expenditures That Generally Do Not Qualify

Costs that have historically been excluded from R&E treatment and that generally would not qualify as specified research or experimental expenditures under IRC 174A include:

• Market research, consumer surveys, and advertising research.
• Quality control testing and routine product inspection (not intended to discover new information).
• Social science research, literary research, and artistic research.
• Research after the product or process is commercially used or commercially viable (post-commercialization costs).
• Efficiency studies and time-and-motion studies not directly tied to developing a new or improved product or process.
• Ordinary and routine product modifications and cosmetic changes without an experimental element.

Software Development Costs: Confirm at IRS.gov

The treatment of software development costs under IRC 174A requires specific confirmation at IRS.gov and by reviewing any applicable IRS guidance issued under or after OBBBA. Before the TCJA, Rev. Proc. 2000-50 provided a separate regime for software development costs that allowed immediate deduction or 36-month amortization. The TCJA's IRC 174 amendments effectively pulled many software development costs into the capitalization regime. The question under IRC 174A is whether software development costs constitute specified research or experimental expenditures in the experimental-or-laboratory sense. The IRS may have issued or may issue guidance clarifying which software development costs qualify under IRC 174A. Do not advise clients on the software development cost classification under IRC 174A without confirming the current position at IRS.gov; the treatment of software development costs has been subject to evolving guidance and may differ from the pre-TCJA position.

Foreign R&E: Excluded from IRC 174A

Foreign research or experimental expenditures are explicitly excluded from the immediate deduction under IRC 174A. Domestic R&E qualifies for the 100% IRC 174A deduction; foreign R&E continues to be amortized over 15 years under the TCJA's amendments to IRC 174. Practitioners must properly allocate R&E expenditures between domestic and foreign research. The allocation methodology (including how to treat costs incurred partly in the United States and partly abroad) should be confirmed with reference to IRC 174A, IRC 174 as amended by the TCJA, and applicable IRS.gov guidance. Misclassifying foreign R&E as domestic to claim the IRC 174A immediate deduction would be an improper tax position.

Section 5: Section 41 Credit and Section 280C(c) Election

The Interaction: IRC 174A Deduction Meets the Section 41 Credit

A taxpayer who both deducts R&E expenditures under IRC 174A and claims the Section 41 research tax credit faces a mandatory coordination rule under Section 280C(c). Under the general rule of Section 280C(c)(1), the amount otherwise deductible under IRC 174A is reduced (dollar-for-dollar) by the amount of the Section 41 credit claimed for the year. This prevents a taxpayer from getting the full deduction benefit and the full credit benefit on the same dollar of qualifying R&E expenditures.

Under the prior TCJA regime (IRC 174 amortization), the interaction was more complex because the amortization of R&E produced timing differences in the deduction stream, and the 280C(c) reduction applied to the amortizable basis rather than a current deduction. Under IRC 174A immediate expensing, the interaction is more straightforward: the full deduction and the full credit cannot both apply to the same expenditure in the same year unless one or the other is reduced. The taxpayer must choose a path.

The Section 280C(c)(3) Reduced-Credit Election

Section 280C(c)(3) provides an alternative to the dollar-for-dollar deduction reduction: the taxpayer may elect to take a reduced credit. Under the reduced-credit election, the credit amount is reduced by a percentage (the applicable credit rate multiplied by the tentative credit amount), but the taxpayer preserves the full IRC 174A deduction without any reduction for the credit. The election is made annually on Form 6765.

Hedge the specific credit reduction percentage and the applicable credit rate to Section 280C(c)(3) and IRS.gov. The percentage depends on the applicable corporate tax rate, which could change with future legislation. The computation must be performed for each taxpayer's specific facts for each tax year; do not apply a general percentage without confirming the current statutory rate at IRS.gov.

Alternative Simplified Credit (ASC): Section 41(c)(5)

Section 41 provides a regular research credit (based on a comparison to a fixed base percentage of gross receipts) and an alternative simplified credit (ASC) under Section 41(c)(5). The ASC is an elective method that may simplify the qualified research expense (QRE) computation for taxpayers who find the regular credit's base period calculation burdensome or impractical. Under Section 41(c)(5), the ASC is computed as a specified percentage of the excess of current-year QREs over 50% of the average QREs for the three preceding taxable years; if there are no QREs in any of the three preceding years, a different rate applies to current-year QREs. Hedge both specified rates to Section 41(c)(5) and IRS.gov; OBBBA may have modified these rates. The ASC is made on Form 6765 and, once made for a taxable year, is generally binding for that year. Confirm current election mechanics with current Form 6765 instructions.

Form 6765 Enhanced Disclosure Requirements

The IRS revised Form 6765 effective for research credits claimed on returns filed after January 10, 2024, to require substantially more information for credits above a specified dollar threshold. This includes detailed business component information, employee details, and QRE allocation by activity. The IRS intended the enhanced disclosure requirements to improve audit selection and compliance in the R&D credit space. Confirm the current applicable threshold and the specific additional disclosure requirements with current Form 6765 instructions at IRS.gov; requirements for 2025 and 2026 returns may differ from the 2024 version. Practitioners advising clients claiming the Section 41 credit under the IRC 174A regime should review the Form 6765 requirements before filing.

Section 6: State Conformity -- The Critical Issue for Multi-State Taxpayers

For multi-state R&D companies, state conformity is not a secondary question -- it is often the most consequential planning issue of the IRC 174A transition. Several major states have decoupled from IRC 174A, meaning taxpayers in those states must amortize R&E expenditures for state income tax purposes while deducting them immediately for federal purposes. This creates a federal/state timing or permanent difference that requires separate state addback schedules and affects estimated tax payments, cash flow planning, and apportionment computations. All state positions below are hedged to applicable state law and current state agency guidance; state conformity positions can change as states enact additional legislation, and practitioners must confirm each position before filing.

State Conformity Comparison Table

Note: All state positions in this table are hedged to the cited state law and current state agency guidance. State conformity positions can change at any time through legislation, administrative guidance, or judicial decision. Confirm each state's current position at the applicable state department of revenue or treasury website before filing.

Why This Matters: The California S-Corp Example

Consider a California S corporation with $5 million in domestic R&E expenditures in the 2025 tax year. For federal purposes, IRC 174A allows an immediate $5 million deduction in 2025. For California purposes, the taxpayer must amortize those same $5 million under TCJA-era IRC 174 rules: approximately $500,000 deductible in 2025 under the mid-year convention, with the balance amortizing over the following years. The result is a $4.5 million California Schedule CA addback in 2025, increasing California taxable income by that amount. The California shareholders pay California income tax on income that was fully deducted at the federal level. This difference must be tracked year by year as the California amortization catches up.

Similar mechanics apply (with variations) in New York, Michigan, and Pennsylvania (for C corporations). For multi-state companies operating in these states, the state addback analysis is a mandatory component of the 2025 return. Failure to perform state addbacks correctly produces state income tax understatements and potential penalties. Hedge the specific addback mechanics and amounts to California FTB guidance, NYS DTF guidance, Michigan Treasury guidance, Pennsylvania DOR guidance, and the applicable state statutes.

Practical Steps for Multi-State Conformity Analysis

• Identify each state in which the taxpayer files income tax returns and has R&E activity.
• Confirm the current conformity position for each relevant state at the applicable state agency website; do not rely on prior-year conformity positions without re-confirming, as state legislation can change mid-year.
• Prepare a state-specific R&E amortization schedule for each decoupled state, tracking domestic and foreign R&E separately and by tax year of origination.
• Identify state Schedule M-1/M-3 addback requirements and confirm required line items and disclosure on each state return.
• For states with decoupling that has retroactive effect (New York), verify how prior-year R&E capitalization under TCJA IRC 174 is treated for state purposes and whether amended returns or adjustments are required.
• Factor state addbacks into estimated tax payment calculations for 2025 and 2026 to avoid underpayment penalties.

Section 7: Common Planning Considerations

Annual Identification and Documentation of Qualifying R&E Activity

IRC 174A's immediate deduction depends on accurate identification of qualifying R&E expenditures. The starting point is an annual exercise: identify which business activities involve the experimental-or-laboratory-sense standard; segregate qualifying wages, supplies, and contractor costs from non-qualifying costs; and document the nexus between each expenditure and the qualifying research activity. Documentation adequate for IRC 174A purposes also generally serves as the foundation for the Section 41 credit computation. Companies that invest in contemporaneous documentation at the activity level substantially reduce audit risk and avoid reconstructive burdens.

Evaluate the Form 3115 and IRC 481(a) Adjustment for 2025 Transition

For clients whose first taxable year beginning after December 31, 2024 has not yet been filed (or is still within the extension period), confirm whether the Rev. Proc. 2025-28 method change and Form 3115 have been addressed. The retroactive catch-up election for 2022-2024 R&E closed on July 6, 2026, but the prospective method change for the 2025 year remains available for taxpayers whose returns are not yet filed. Review the IRC 481(a) adjustment for the prospective change and confirm that the deduction is properly characterized as an IRC 481(a) adjustment on the return. Hedge all filing specifics to Rev. Proc. 2025-28 and current Form 3115 instructions at IRS.gov.

Section 280C(c)(3) Election Analysis: Run the Numbers

For every client claiming both the IRC 174A deduction and the Section 41 credit, the Section 280C(c)(3) election is a required decision, not an optional one. The election or non-election must be made on Form 6765 each year; it does not carry forward automatically. Practitioners should compute both scenarios (full deduction reduced by full credit versus reduced credit with full deduction preserved) for each client before recommending a path. The comparison must account for the taxpayer's effective tax rate for the year, the applicable credit rate, and any CAMT (corporate alternative minimum tax) exposure. For the interaction between IRC 174A deductions and CAMT adjusted financial statement income (AFSI), see the CAMT Corporate Alternative Minimum Tax Form 4626 Practitioner Guide.

Multi-State Conformity Analysis: Non-Negotiable for CA, NY, MI, and PA Filers

No IRC 174A planning is complete for a multi-state client without a state-by-state conformity analysis. The states listed in Section 6 each require separate tracking of R&E amortization for state purposes and addback adjustments. Confirm current state positions before finalizing any return; state law changes can occur between the date this guide was published and the date of filing.

IRC 163(j) Business Interest Limitation: ATI Impact

For taxpayers subject to the IRC 163(j) business interest deduction limitation, IRC 174A immediate expensing affects adjusted taxable income (ATI) computations when ATI is calculated on an earnings-based basis. Under certain ATI definitions, a large IRC 174A deduction reduces ATI, which in turn reduces the business interest deduction limitation. This interaction can be significant for R&D-intensive companies that also carry significant debt financing. Practitioners advising such clients should coordinate the IRC 174A and IRC 163(j) analyses. For the current ATI computation and OBBBA modifications to IRC 163(j), see the IRC 163(j) Business Interest Limitation OBBBA Practitioner Guide.

Excess Business Loss Limitation: IRC 461(l) Interaction

For individual taxpayers and pass-through owners, a large IRC 174A deduction in the first year may trigger or increase excess business loss limitations under IRC 461(l). The immediate deduction of previously capitalized R&E, combined with the IRC 481(a) adjustment (for those who acted within the Rev. Proc. 2025-28 window), can produce a current-year business loss that is limited at the owner level under IRC 461(l). For the interaction between large deductions, pass-through losses, and IRC 461(l), see the IRC 461(l) Excess Business Loss Limitation OBBBA Practitioner Guide.

Cash Flow and Estimated Tax Planning

IRC 174A's immediate deduction creates a front-loaded deduction in the first year of application (2025 for calendar-year taxpayers). A client that has been making estimated tax payments based on prior-year TCJA amortization levels may be significantly overpaying federal and (where state conformity applies) state estimated taxes in 2025. Conversely, for states that decoupled (California, New York, Michigan, and Pennsylvania for C corps), the state estimated tax obligation may be higher than expected because the large federal deduction does not flow through to state income. Practitioners should revisit Q4 2025 and 2026 estimated tax payment schedules in light of IRC 174A. The IRC 174A deduction also affects current-year ATI for the IRC 163(j) computation, which may free up previously limited business interest deductions -- a further planning point to capture.

Frequently Asked Questions

1. 1. What is IRC 174A and how is it different from prior law?

   IRC 174A is a new code section enacted by the One Big Beautiful Budget Act (OBBBA) providing for an immediate 100% deduction for domestic specified research or experimental expenditures paid or incurred in taxable years beginning after December 31, 2024. Under prior law, the Tax Cuts and Jobs Act of 2017 amended IRC 174 to require 5-year domestic amortization and 15-year foreign amortization for research and experimental expenditures, effective for taxable years beginning after December 31, 2021. IRC 174A provides immediate deductibility for domestic R&E using a new code section rather than repealing the TCJA IRC 174 amendments. Foreign research or experimental expenditures continue to be amortized under IRC 174A. Hedge all specifics to IRC 174A as enacted by OBBBA and IRS.gov.

2. 2. Who can use the catch-up deduction under Rev. Proc. 2025-28 for 2022-2024 R&E costs?

   Rev. Proc. 2025-28 allowed taxpayers who capitalized domestic research or experimental expenditures under IRC 174 in taxable years beginning in 2022, 2023, or 2024 to claim a catch-up IRC 481(a) adjustment in the first taxable year beginning after December 31, 2024 -- a one-time deduction for the unamortized balance of prior capitalizations. However, the window for making the retroactive election under Rev. Proc. 2025-28 for 2022-2024 closed on July 6, 2026. Taxpayers who missed this window should consult current IRS.gov guidance and tax counsel for any available remedies. For 2025 and forward taxable years, Rev. Proc. 2025-28 provides automatic consent procedures to change from IRC 174 amortization to IRC 174A immediate expensing going forward. Hedge all Rev. Proc. 2025-28 specifics to the full text of the Rev. Proc. and IRS.gov.

3. 3. How do I handle the Section 41 R&D credit under IRC 174A?

   If a taxpayer claims the Section 41 research tax credit, the IRC 174A deduction is reduced by the credit amount under the general rule of Section 280C(c)(1). Alternatively, under Section 280C(c)(3), the taxpayer may elect to take a reduced credit (a credit reduced by a specified percentage) and preserve the full IRC 174A deduction. The election is made annually on Form 6765. The optimal choice depends on the taxpayer's effective tax rate, the credit rate, and whether the deduction or the credit produces more aggregate tax savings. Hedge all credit reduction percentages and the current credit rate to Section 280C(c)(3), the applicable Section 41 credit rate for the tax year, and IRS.gov. Practitioners should compute both scenarios for each client.

4. 4. Does California conform to IRC 174A?

   No. California's income tax conformity date is January 1, 2025 (set by S.B. 711), which predates the OBBBA enactment date of July 4, 2025. As a result, California does not conform to IRC 174A. California taxpayers must continue to amortize domestic research and experimental expenditures under TCJA-era IRC 174 rules for California income tax purposes, while taking the immediate deduction for federal income tax purposes. This produces a permanent or timing difference requiring a Schedule CA addback. Hedge the current California position to the California Revenue and Taxation Code, current FTB guidance, and any subsequent California legislation at the California FTB website. State conformity positions can change; confirm the current California position before filing.

5. 5. What expenditures qualify for the immediate deduction under IRC 174A?

   IRC 174A applies to specified research or experimental expenditures paid or incurred in connection with the taxpayer's trade or business that represent research and development costs in the experimental or laboratory sense. Qualifying costs generally include wages paid to research employees, research supplies, and amounts paid to contractors for research performed on behalf of the taxpayer. Expenditures for market research, quality control testing, social science research, and literary or artistic research generally do not qualify. The treatment of software development costs under IRC 174A should be confirmed at IRS.gov and by reviewing any applicable IRS guidance; the treatment of software development costs has been subject to evolving guidance. Hedge the precise definition of qualifying expenditures and the inclusion or exclusion of specific cost categories to IRC 174A and IRS.gov.

6. 6. What do multi-state R&D companies need to do now?

   Multi-state companies with R&D activity must perform a state-by-state conformity analysis before relying on IRC 174A for planning purposes. As of this guide's publication, major states that decouple from IRC 174A include California (no conformity; TCJA amortization), New York (decoupled; 5-year amortization for state purposes, retroactive to January 1, 2025), Michigan (decoupled; TCJA amortization), and Pennsylvania (decoupled for C corporations only; pass-throughs and individuals are not affected by Pennsylvania's decoupling). Illinois conforms to IRC 174A by default under its rolling conformity. Practitioners should confirm each state's current conformity position at the applicable state's department of revenue or treasury website before filing; state conformity positions can change as states enact additional legislation.

Related Practitioner Guides

The following guides cover OBBBA provisions and related tax rules that practitioners should consider alongside the IRC 174A analysis.

• IRC 41 Research and Development Tax Credit Guide -- IRC 174A (the deduction) and IRC 41 (the credit) apply to the same research expenditures; the Section 280C(c) reduced-credit election coordinates the two, and practitioners must compute both scenarios to determine the optimal outcome for each client.
• IRC 168(k) and 168(n) Bonus Depreciation and Qualified Production Property Guide -- both IRC 174A and IRC 168(k)/168(n) are OBBBA provisions for capital-intensive and research-intensive businesses; practitioners who advise on one often need to analyze the other in the same engagement.
• IRC 163(j) Business Interest Limitation Guide -- the Section 280C(c) reduced-credit election under IRC 174A affects adjusted taxable income for IRC 163(j) purposes; research-intensive businesses need to analyze both provisions together to model the full impact on deductible business interest.
• Form 3115 Accounting Method Change Guide -- taxpayers making the catch-up 481(a) adjustment under Rev. Proc. 2025-28 for previously capitalized R&E use Form 3115 to change their accounting method; this guide covers the automatic consent procedures and required disclosures.
• IRC 263A UNICAP Uniform Capitalization Rules Practitioner Guide -- when a taxpayer performs both qualified research activities subject to IRC 174A and production activities subject to IRC 263A, the cost allocation between the two regimes requires careful documentation; costs qualifying for IRC 174A treatment are explicitly excluded from the UNICAP pool under IRC 263A and Treas. Reg. 1.263A-1(e)(3)(iii)(B); misclassifying qualifying research costs as UNICAP inventory costs can result in overpayment and examination exposure.
• IRC 481(a) Method Change Adjustment -- Taxpayers changing to or from the IRC 174A amortization method for research expenditures must compute a section 481(a) adjustment under Rev. Proc. 2025-28.