Section 174A R&D Expensing Restored: A Small-Business Guide to Amending 2022-2024 Returns

If you run a software company, biotech startup, or any business that pays engineers or scientists to build new things, the four-year-long Section 174 nightmare is finally over. For tax years beginning after December 31, 2024, you can once again deduct your domestic research and development costs the year you incur them — no more spreading a developer's salary over five years just because they wrote code that survived to the next sprint.

Better still, if your business made under roughly $31 million in average gross receipts, you can reach back into 2022, 2023, and 2024, undo the capitalization, and ask the IRS for a refund — but only until July 6, 2026.

That window is short, the math is tricky, and the choice you make this year will shape your effective tax rate for the next five. Here is what changed, who qualifies for the small-business catch-up, and the specific decisions you need to lock in before the next filing deadline.

A Quick Recap of How We Got Here

When the Tax Cuts and Jobs Act passed in 2017, Congress quietly inserted a delayed-fuse provision: starting in 2022, taxpayers could no longer immediately deduct research or experimental (R&E) expenditures under Section 174. Instead, domestic R&E had to be capitalized and amortized over five years, while foreign R&E faced a 15-year recovery period.

The provision was written as a budget gimmick. Because the deduction was merely deferred, not eliminated, it scored as a revenue raiser inside a 10-year window. Lawmakers expected to repeal it before it ever took effect.

That repeal never came. From 2022 through 2024, businesses had to capitalize software development, prototype engineering, lab work, and a long list of other costs that had been immediately deductible since 1954. The result was a phantom tax: a profitable company that paid $1 million in salaries to its engineering team could deduct only $100,000 in year one (the half-year convention applied to the first year), even though every dollar walked out the door as cash.

Thousands of cash-strapped startups discovered they owed unexpected federal income tax on accounting profits that did not match their bank balances.

What the One Big Beautiful Bill Act Changed

The One Big Beautiful Bill Act (OBBBA), enacted in 2025, created a new code section — Section 174A — that restores immediate expensing for domestic R&E starting in tax years beginning after December 31, 2024. The original Section 174 stays on the books for foreign research, which still has to be amortized over 15 years.

The headline provisions:

• Immediate expensing: Domestic R&E paid or incurred in 2025 and later can be deducted in the year you incur it.
• Optional 60-month amortization: If you prefer to spread the deduction (for instance, to preserve net operating losses or smooth income), you can elect to capitalize and amortize over at least 60 months, beginning the month you first realize a benefit.
• Section 59(e) 10-year alternative: A separate election under Section 59(e) lets you spread the deduction over 10 years if you want even slower recovery.
• Foreign research stays capitalized: R&E performed outside the United States must still be amortized over 15 years.
• Small-business retroactive election: Eligible smaller taxpayers can apply Section 174A all the way back to 2022 and recover taxes already paid.

Because the rules differ for prior-year unamortized balances and for small versus large taxpayers, the decisions are not one-size-fits-all.

The Small-Business Catch-Up Rule

This is the provision most worth your attention if your company is in the right size band.

Who Qualifies

You are eligible if your average annual gross receipts for the three tax years immediately preceding 2025 do not exceed roughly $31 million (the threshold tracks the inflation-adjusted Section 448(c) limit). Aggregation rules apply, so commonly controlled groups must combine their receipts.

You also need to have been classified as performing R&E activity under Section 174 — typically writing software, designing products, formulating compounds, or otherwise improving a function, performance, reliability, or quality. Not every product expense counts; routine quality control, market research, advertising, and post-commercial-production tweaks generally do not.

Two Pathways Back

Eligible small businesses can choose either:

1. Amend each affected return (2022, 2023, 2024). You file Form 1040-X (sole proprietors), 1120-X (C corps), or 1065 with an amended return box checked, recompute taxable income with the new immediate deduction, and request a refund.

2. Make a Section 481(a) catch-up adjustment by filing a Form 3115 change of accounting method on a timely 2024 or 2025 return. The cumulative deduction for prior-year unamortized R&E flows through as a single adjustment.

For most small businesses, the amended return route generates an immediate cash refund, while the 3115 catch-up applies the deduction against current and future income. Your cash position, current-year profitability, and any net operating loss carrybacks should drive the choice.

The Hard Deadline

Whichever path you choose, the small-business retroactive election must be filed no later than July 6, 2026, or the normal Section 6511 statute of limitations on refund claims, whichever is earlier. For a 2022 calendar-year return, the statute of limitations typically closes three years after the original due date — so April 15, 2026 for a return filed on time without an extension.

That earlier date governs. Sit on this past spring 2026 and your 2022 refund opportunity disappears.

What If You Are Above the $31 Million Threshold?

Larger taxpayers do not get the retroactive election, but you still have meaningful choices for handling pre-2025 capitalized R&E balances.

You can:

• Continue amortizing existing capitalized amounts over the original five-year schedule (the default).
• Accelerate the remaining unamortized balance entirely into your first tax year beginning after December 31, 2024.
• Spread the remaining balance ratably over 2025 and 2026.

Accelerating the deduction can produce a large one-time loss that may offset other income, generate a net operating loss, or reduce GILTI inclusions. But it can also waste deductions if you are already in a loss position. Run the numbers under multiple scenarios before locking in the choice.

Coordinating With the Section 41 R&D Tax Credit

The R&D credit under Section 41 has always interacted awkwardly with Section 174, and OBBBA preserves that complexity. Under Section 280C(c), you must reduce your Section 174A deduction by the amount of any research credit you claim — unless you elect to take a reduced credit (currently 79% of the gross credit) and keep the full deduction.

The math here matters. For a profitable C corp at the 21% federal rate, electing the reduced credit usually leaves more value on the table than the deduction haircut would. For a startup using the payroll tax offset election, the calculus shifts. Model both before checking either box.

If you retroactively apply Section 174A to 2022, 2023, or 2024, the conforming Section 280C(c) amendments must be applied retroactively too. That means revisiting any reduced-credit elections you originally made — and possibly recovering some of the credit benefit you gave up.

State Conformity Is Going to Be a Mess

Federal Section 174A automatically means immediate domestic R&E expensing for federal taxable income. Whether your state follows depends on whether it conforms to the Internal Revenue Code on a rolling basis (most do), on a static date (a handful), or with selective decoupling (California, New Jersey, and others).

Some states never conformed to TCJA's Section 174 capitalization in the first place, so their rules are unchanged. Others conformed and will likely conform to OBBBA, but only after their legislatures act — leaving 2025 returns potentially subject to mismatched federal and state treatment.

If you operate in multiple states, this is the single most likely place to make a costly error. Track conformity legislation through year-end 2026.

Other Provisions Worth Modeling

A few collateral effects often get overlooked when companies plan around the new R&E rules:

• Section 163(j) interest limitation: Larger immediate deductions reduce adjusted taxable income, which can shrink the amount of business interest you can deduct. Model both provisions together.
• Partnership deduction utilization: At-risk and basis limitations can prevent partners from using the immediate deduction even when the partnership generates one. K-1 recipients should look at outside basis before assuming the deduction lands on their personal return.
• AMT for individuals: Pass-through R&E deductions can push individual recipients into AMT territory in unusual fact patterns.
• QBI deduction interaction: For pass-through owners eligible for the Section 199A deduction, a larger R&E expense reduces qualified business income — and therefore the 20% deduction — by a corresponding amount. The net benefit is still positive, but smaller than the gross deduction suggests.
• Foreign branch shift: With domestic research immediately deductible and foreign R&E stuck on a 15-year clock, multinationals will face renewed pressure to onshore research activity.

Procedural Mechanics: Rev. Proc. 2025-28

The IRS issued Revenue Procedure 2025-28 in 2025 to provide automatic-consent procedures for the relevant accounting method changes. The procedures cover four discrete changes:

1. Adopting the Section 174A immediate deduction for post-2024 expenditures.
2. Adopting the Section 174A 60-month amortization for post-2024 expenditures.
3. Retroactively applying Section 174A under the small-business election for TCJA years.
4. Accelerating remaining unamortized balances over one or two years.

Most changes are made with a Form 3115 and require a Section 481(a) adjustment in the year of change. For the new methods adopted in your first post-2024 tax year, the change is generally on a cut-off basis (no Section 481(a) adjustment for prior years' amounts unless you elect to accelerate them).

This is the kind of return where a single missed election or wrong box on a Form 3115 can cost you the entire benefit. Coordinate with your tax preparer well before filing, and document the elections in your workpapers.

A Realistic Example

Imagine a 12-person SaaS company that paid $2 million in U.S. engineering salaries in each of 2022, 2023, and 2024. Under TCJA Section 174, the company could deduct only $200,000 in 2022 (half-year convention), $600,000 in 2023, and $1.0 million in 2024 — leaving $4.2 million in capitalized R&E on the balance sheet at the start of 2025.

Assume the company is a C corp paying a 21% federal rate, has under $31 million in gross receipts, and was profitable enough to actually pay tax in each year on the artificially inflated income.

The company can:

• Amend 2022, 2023, and 2024: Reclaim the additional deductions and recover roughly $880,000 in federal tax across the three years (rough calculation; actual depends on credits and state effects).
• File a Form 3115 with the 2025 return: Take the entire $4.2 million unamortized balance as a current-year deduction, generating a large 2025 NOL that can be carried forward indefinitely (subject to 80% utilization).
• Spread the catch-up across 2025 and 2026 to better match expected income.

Running the projection both ways — and including the Section 41 R&D credit interaction — frequently swings the answer by six figures.

Don't Forget Your Books

Whatever path you choose, the moment you make a Section 174A method change, your accounting records have to be updated to match. That means:

• Reversing capitalized R&E balances on your balance sheet.
• Re-running deferred tax calculations under ASC 740 if you produce GAAP financials.
• Reclassifying prior-period software development costs that were sitting in long-term assets.
• Keeping contemporaneous records of which expenses qualified — engineer time tracking, project descriptions, and supporting documentation that ties back to the four-part test.

The IRS has been increasing scrutiny of R&E claims since the original capitalization regime took effect. Reverting to immediate expensing does not relax the documentation requirements — if anything, it raises the stakes, because more dollars now ride on the qualification analysis.

Accurate, contemporaneous bookkeeping is the difference between a defensible refund claim and one that unravels under examination. Tag every developer's salary, every contractor invoice, and every prototype expense as research-or-not at the time you book it, with enough detail that a reviewer two years from now can reconstruct the project.

Action Items Before July 2026

If you think you might qualify for the small-business retroactive election, here is the sequence to work through this spring:

1. Confirm your gross receipts test for the 2022, 2023, and 2024 base periods. Aggregate commonly controlled entities.
2. Reconstruct your domestic R&E spend for 2022 through 2024, broken down by project. If you never tagged costs at the time, this is where the work compounds.
3. Quantify the refund opportunity versus a current-year Section 481(a) adjustment, including any Section 41 credit interaction.
4. Decide on the deduction method going forward — immediate, 60-month, or 10-year — and how each interacts with your projected taxable income.
5. Check state conformity for every jurisdiction in which you file.
6. File the elections before the earlier of July 6, 2026 or the relevant statute of limitations date.

For most eligible small businesses, the answer is to amend, take the cash, and adopt immediate expensing prospectively. But the right path depends on facts that vary company by company.

Keep Your R&D Records Audit-Ready

The Section 174A regime rewards companies that can show their work — tied directly to project ledgers, payroll detail, and contemporaneous notes. Beancount.io provides plain-text accounting that gives you complete transparency and version control over every transaction, with a full history that your CPA, your CFO, or an IRS examiner can read directly. Get started for free and build the kind of paper trail that makes a retroactive R&E claim straightforward — not a year-end scramble.