Domestic R&D is fully deductible again

For three years the tax code made you capitalize research costs and pay tax on money you had already spent. The One Big Beautiful Bill Act ended that. New IRC §174A restores immediate, full expensing of domestic R&E - with a catch-up deduction for the balance you capitalized in 2022-2024, and a coordination rule with the §41 credit that you have to get right in the same return.

Get your §174A position scoped The R&D credit

§174A in four lines

Domestic R&E: deducted in full, in the year incurred, for tax years beginning after Dec 31, 2024.
Foreign R&E: still capitalized and amortized over 15 years. No change.
The 2022-2024 balance: caught up in one year, or spread across two.
Claiming the credit too: §280C(c) decides whether you shrink the deduction or the credit.

First, the distinction

§174A is a deduction. §41 is a credit. They are not alternatives.

Nearly every §174A question that goes wrong starts here - someone treats the deduction and the credit as two names for the same benefit, or assumes claiming one forecloses the other.

§174A - when you deduct

A timing provision. It governs when research and experimental costs reduce taxable income: now, in full, for domestic spend. Its value is the time value of money and the cash you keep this year - significant, and different in kind from a credit.

Its reach is also broader than the credit’s. Costs that never make it into a qualified research expense can still be R&E expenditures deductible under §174A.

§41 - how much tax you owe

A permanent benefit. The credit reduces tax dollar for dollar, and for a qualified small business it can be applied against employer payroll taxes instead of income tax. But it reaches a narrower set of costs: only expenses that clear the four-part test and survive the §41(d)(4) exclusions.

A useful rule of thumb: a §41 qualified research expense generally has to be a §174/§174A expenditure first - the reverse does not hold.

The problem (2022-2024)

Under the TCJA, for tax years beginning after December 31, 2021, businesses had to capitalize and amortize research and experimental costs instead of deducting them - domestic over 5 years, foreign over 15. Companies that spent every dollar they raised on engineering reported taxable income they did not have, and paid tax on it.

The change (§174A)

The One Big Beautiful Bill Act (P.L. 119-21), signed July 4, 2025, created new IRC §174A, restoring immediate, full expensing of domestic R&E for tax years beginning after December 31, 2024. Software development is included.

What the first year looks like

Immediate expensing does not change the total deduction you eventually take - it changes when you take it, and under the prior rules the first year was the cruellest slice.

Illustrative. First-year federal deduction on $1,000,000 of domestic R&E paid or incurred in 2025 - about $100,000 under prior 5-year amortization vs. the full $1,000,000 under §174A. Actual results depend on your facts; this is not a projection of your benefit.

View data

First-year deduction on $1,000,000 domestic R&E (illustrative)
Treatment	First-year deduction
Prior TCJA §174 (5-yr amortization)	$100,000
New §174A (immediate)	$1,000,000

The catch-up choice

If you capitalized domestic R&E in 2022-2024, the unamortized balance does not evaporate. You deduct it either all at once in the first tax year beginning after December 31, 2024, or ratably across that year and the following one.

Illustrative catch-up timing on $1,000,000 of remaining unamortized domestic R&E
Election	First year	Next year
All at once	$1,000,000	-
Ratably over two	$500,000	$500,000

Illustrative - $1,000,000 of remaining unamortized domestic balance, shown to make the two shapes visible. Which one is better is a modeling question: marginal rate, loss position, other limitations, and what the deduction does to your ability to use credits in the same year. Taking the whole thing into a year with no income can waste it.

What §174A actually says

Foreign R&E unchanged

Research performed outside the U.S. must still be capitalized and amortized over 15 years under §174. Where the work physically happens is now a tax fact worth tracking.

Optional elections

Prefer to spread it? You may elect to capitalize and amortize domestic R&E over no less than 60 months, or use the separate 10-year write-off election under §59(e).

Catch-up for 2022-2024

Deduct the remaining unamortized domestic balance fully in the first tax year beginning after Dec 31, 2024, or ratably across that year and the next.

Small-business retroactivity - closed

Eligible small businesses under the §448(c) gross-receipts test could amend 2022-2024 to apply §174A retroactively. That window ran to July 6, 2026 and has passed; the catch-up deduction is the remaining path for everyone.

Rev. Proc. 2025-28

IRS mechanics (Aug 28, 2025): automatic-consent method changes - Form 3115 or, in some cases, a simplified statement - and the available elections. Its retroactive window has passed; current-year choices remain.

Coordinated with the §41 credit

The credit still applies and ties to your domestic §174A amounts. The §280C(c) reduced-deduction versus reduced-credit choice is made in the same return - see below.

No double benefit

Where §174A and §41 meet: the §280C(c) choice

You can take the deduction and the credit. What you cannot do is take both at full strength on the same dollars - and the way you resolve that is an election with real money attached.

§280C(c) offers two doors. Behind the first, you claim the full §41 credit and reduce your research deduction (or the amount you capitalize) by the credit amount. Behind the second, you make the §280C(c)(2) election, take a reduced credit, and keep the deduction intact.

Which door is better is arithmetic, and the arithmetic is taxpayer-specific: it turns on your marginal rate, on whether you can actually use a larger deduction this year, on your loss and credit-carryforward position, and on whether the states you file in conform. A C corporation and a pass-through owner facing the same gross credit can reach opposite conclusions.

Timing trap. The reduced-credit election is generally made on a timely filed original return, extensions included. It is not something you can add on an amended return after the fact - which is why the modeling belongs in the study, before the return goes out, not in a post-filing cleanup.

Every Ricerca study runs both positions and reports the after-tax result of each, so the election is a decision your preparer makes with numbers rather than a default someone inherited. The mechanics of the credit side - Regular versus ASC, fixed-base percentage, the election itself - are covered in calculation methods.

Who this actually changes the math for

§174A is not equally interesting to everyone. Four situations account for most of the real movement.

Profitable software companies

The clearest winners. Capitalization inflated taxable income for three years on spend that was almost entirely domestic engineering payroll; expensing reverses that in the year it is incurred, and the catch-up releases what was stranded. See SaaS and software.

Companies with offshore engineering

The uncomfortable case. Foreign R&E is still a 15-year write-off and still outside the credit, so the gap between a domestic and an offshore engineering dollar just widened considerably. Knowing which is which now requires the same location data the state computation needs.

Pre-revenue and early-stage

A larger deduction in a loss year mostly grows the NOL. The cash usually comes from somewhere else: the §41(h) payroll-tax offset, which reaches employer payroll taxes rather than income tax.

Manufacturers and hardware developers

Process development, tooling trials, and prototype iterations are R&E - and the deduction reaches costs the credit never counts. Getting both right means separating them cleanly in the same records. See manufacturing and technology and hardware.

How we got here

Dec 2017

TCJA enacted

The Tax Cuts and Jobs Act set the stage for required capitalization of research costs.
TY 2022

Capitalization begins

For tax years beginning after Dec 31, 2021, R&E had to be capitalized and amortized - domestic over 5 years, foreign over 15.
Jul 4, 2025

OBBBA signed (P.L. 119-21)

The One Big Beautiful Bill Act created new IRC §174A restoring immediate domestic R&E expensing.
TY 2025

§174A takes effect

Immediate, full expensing of domestic R&E for tax years beginning after Dec 31, 2024.
Aug 28, 2025

Rev. Proc. 2025-28

IRS procedural guidance: automatic method changes, the available elections, and the small-business retroactive relief.
Jul 6, 2026

Small-business amend window closed

The general deadline for eligible small businesses to amend 2022-2024 returns passed. The catch-up deduction - fully in the first year beginning after Dec 31, 2024, or ratably across that year and the next - remains available to all taxpayers.

The bottom line

The deduction gives you the year back. The credit gives you the money.

§174A accelerates when your research spend reduces income; §41 reduces the tax itself. Captured together, on one substantiated base, with the §280C choice modeled rather than defaulted, the combination is worth materially more than either alone - and it holds up when someone asks how you got there.

Get your §174A position scoped How we defend it

Primary & authoritative sources

Tax law evolves and guidance is updated; verify current rules and deadlines with a qualified professional before acting.

Section 174A - frequently asked questions

Did the R&D tax credit itself change?

No. The §41 credit did not change. What changed is how you deduct research costs - new §174A restores immediate expensing of domestic R&E. You can claim the deduction and the credit, subject to the §280C(c) coordination described above. See the R&D credit guide for the credit side.

When does §174A take effect?

For tax years beginning after December 31, 2024 - 2025 for a calendar-year taxpayer.

Is §174A a real benefit, or just timing?

Mostly timing - and timing is worth real money. Over a long enough horizon you deduct the same dollars either way; expensing pulls the deduction forward, which is cash you keep now instead of in five annual slices. The permanent benefit in an R&D program comes from the §41 credit, which reduces tax dollar for dollar. That is why the two are worth doing together rather than choosing between them.

Does §174A cover software development?

Yes. Domestic software development costs are treated as research or experimental expenditures eligible for immediate expensing under §174A. Whether those same costs are also credit-qualified is a separate test - internal-use software in particular carries a heightened standard. See qualified research expenses.

What about research performed outside the U.S.?

Unchanged, and unforgiving: foreign R&E must still be capitalized and amortized over 15 years under §174. The credit side already excluded research conducted outside the United States (with a narrow allowance for Puerto Rico and U.S. possessions) under §41(d)(4)(F). The two tests are not identical, but the practical effect is that an offshore engineering dollar is the worst-treated dollar in an R&D budget - no credit, and a 15-year deduction.

Can we recover tax on R&D we capitalized in 2022-2024?

Through the catch-up deduction, yes. All taxpayers can deduct the remaining unamortized domestic balance either fully in the first tax year beginning after Dec 31, 2024, or ratably across that year and the following one. The separate small-business option to amend 2022-2024 returns and claim refunds generally closed July 6, 2026; only narrow situations tied to a still-open refund statute of limitations may remain - confirm with a qualified professional before assuming one applies.

What is Rev. Proc. 2025-28?

IRS procedural guidance issued August 28, 2025 setting out how to adopt §174A - automatic-consent accounting-method changes and the available elections - along with the small-business retroactive relief whose amend window generally closed July 6, 2026. The remaining decisions, such as catch-up timing, are made on current-year returns.

Do we have to file Form 3115?

Often, but not always. Adopting §174A is generally an accounting-method change made with automatic consent under Rev. Proc. 2025-28; depending on the year and the specific change, that is made on Form 3115 or, in some cases, under a simplified statement procedure. Which applies depends on your facts and the year you are filing - settle it with your preparer before the return goes out.

How does §280C affect the credit?

It prevents a double benefit on the same dollars. If you claim the full §41 credit, you reduce your research deduction by the credit amount - or you elect the reduced credit under §280C(c)(2) and keep the full deduction. Which is better is arithmetic, not doctrine: it turns on your marginal rate, whether you can actually use the deduction this year, and state conformity. A study models both and keeps the better after-tax result. The election is generally made on a timely filed original return, so it is not something to leave for an amendment.

We are pre-revenue and running losses. Does §174A help us?

Less than you would hope, on its own. A bigger current-year deduction in a loss year usually just enlarges a net operating loss, and an NOL is only worth something when there is income to absorb it. The provision that produces cash for a pre-revenue company is the §41(h) payroll-tax offset, which applies the credit against employer payroll taxes rather than income tax.

Do states follow §174A?

Not uniformly. Some states conform to federal treatment automatically; others sit on fixed conformity dates and can still require capitalization after the federal rules changed, which means a federal expensing position and a state one that disagrees. We check the states you file in - see state R&D credits.

Working through a catch-up election on a live return? Email [email protected] - We typically reply within one business day.

Don’t leave §174A on the table

Whether you’re filing the current year or cleaning up a catch-up election, we’ll scope your domestic expensing position, your §41 credit, and the §280C choice between them - reviewed and finalized by R&D experts, and backed by Audit Protection.

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