Summary: For taxpayers who invested in R&D between 2022 and 2024, a one-time retroactive window closes on July 6, 2026. Qualifying small businesses can amend prior year returns to recover taxes paid under the TCJA’s five-year amortization rule. There are no extensions. Learn who qualifies, how to file, and what to do right now.
Businesses that invested in research and development (R&D) between 2022 and 2024 have a narrow window to benefit from the opportunity to amend prior year tax returns. The one-time opportunity closes on July 6, 2026, and missing the window could mean permanently missing out on a significant cash refund.
This isn’t a soft deadline; there are no extensions. Once July 6 passes, qualifying businesses lose their right to retroactively fully deduct the R&D costs from those years forever.
Here is what you need to know, and what you can do right now.
What Changed and Why It Matters
For tax years beginning after December 31, 2021, the Tax Cuts and Jobs Act (TCJA) required businesses to amortize domestic R&D expenditures over five years rather than deducting them in full in the year incurred. The foreign R&D amortization period was stretched even further: businesses were required to spread the related deductions over 15 years. For many innovative companies, this change significantly increased taxable income for three consecutive years.
The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, reversed the amortization requirement for domestic R&D. Domestic R&D expenses are now immediately deductible again beginning with tax year 2025. However, the new law went further: it also created a retroactive pathway for qualifying small businesses to go back and amend 2022, 2023, and 2024, and recover taxes that were artificially inflated due to the capitalization requirement.
That retroactive window closes on July 6, 2026.
What’s at Stake?
For clients who spent meaningful dollars on qualifying R&D during 2022–2024, the benefit can be substantial. Consider a business that expensed $500,000 per year in qualifying domestic R&D costs over those three years but was required to amortize them over five years. Instead of deducting $500,000 in the year incurred ($1.5M in aggregate over the three year period), they deducted far less in each applicable year and paid taxes on income that an amended return could eliminate.
At a 21% federal corporate tax rate under IRC § 11(b), every additional $100,000 of deduction in those years is worth roughly $21,000 in federal cash tax savings, before considering any impact on state taxes or the research credit.
Who Qualifies?
The retroactive relief is available to qualified small businesses, defined as those with average annual gross receipts of $31 million or less for the 2022–2024 period, as determined under Section 448(c).
A few important nuances:
- The threshold is measured at the controlled group level, not the individual legal entity. If the taxpayer is part of a broader corporate structure or affiliated service group, gross receipts from all related entities must be aggregated.
- Consistency is required. If the taxpayer elects retroactive treatment, it must be applied across all three years (i.e., 2022, 2023, 2024). Cherry-picking individual years is not permitted.
- Foreign R&D is excluded. The retroactive relief applies only to domestic R&D costs. Foreign expenditure remains subject to 15-year amortization under the original TCJA rules and OBBBA.
Filing Mechanics
Qualifying businesses must file amended federal tax returns (or administrative adjustment requests for BBA partnerships) for each applicable year by the earlier of July 6, 2026, or the statute of limitations under Section 6511 for that specific tax year.
The second part matters and is frequently overlooked.
For a calendar-year filer who filed their 2022 return on March 15, 2023, the three-year statute may have closed as early as March 15, 2026. If that deadline has already passed, the retroactive opportunity for that year is gone, regardless of the July 6 date. Businesses that extended their 2022 returns have more runway, but every client situation needs to be evaluated individually.
Additional mechanics to keep in mind:
- The Section 280C interaction must be addressed. Businesses electing retroactive expensing must also retroactively apply the conforming amendments to Section 280C(c), which affects how the R&D credit interacts with the deduction. A late Section 280C(c)(2) election or revocation can also be made on amended returns for eligible small businesses by the July 6 deadline.
- Documentation requirements are elevated for refund claims. If the amended return produces an increased tax refund as a result of claiming an R&D credit that was not included on the original return, the IRS expects business component-level substantiation under its five-item framework. A 45-day perfection window is available through January 10, 2027, but arriving well-documented is always the stronger position.
What To Do Right Now
Taxpayers who invested in research, software development, engineering, process improvement, product design, or technical problem-solving between 2022 and 2024 should start with these steps:
- Communicate immediately with your CPA and R&D advisory services. Act quickly to allow sufficient time for the amended filings and a meaningful multi-year R&D study, if necessary. Early coordination between R&D advisory services and your tax provider can be the difference between a successful refund or a missed deadline.
- Work with your R&D and tax teams to confirm the gross receipts threshold. Run the controlled group analysis under Section 448(c) before making any elections.
- Check the statute of limitations for each applicable year. The July 6 date is the outer limit. A taxpayer’s actual window may be earlier.
- Evaluate the economics. Model the retroactive deduction benefit against permissible alternatives such as accelerating remaining unamortized costs in 2025 or ratably between 2025 and 2026 to determine which approach delivers the better outcome.
- Assess the Section 280C interaction. Determine whether making or revoking the reduced credit election on amended returns improves the overall position.
- Prepare documentation. Begin gathering business component-level documentation now if a credit refund claim will accompany the amended returns.
Final Thoughts
Aprio’s R&D Tax Credit Services team has deep experience helping businesses navigate the complexities of Section 174, Section 41, and the retroactive elections now available under the OBBBA. Whether your business is software, manufacturing, engineering, or innovation in virtually any industry, we can help evaluate eligibility, model the options, and prepare amended filings with the documentation to support them.
