What will be the impact of Section 174 in 2026?

Key takeaways:

• • • Immediate R&D deductions — The One Big Beautiful Bill Act introduces Section 174A, which restores immediate deduction of domestic research and experimental expenditures starting in tax years beginning after December 31, 2024, reversing the controversial five-year amortization requirement that took effect in 2022.

    • Retroactive tax changes — Small business taxpayers with average annual gross receipts of $31 million or less (for tax years beginning in 2025) will generally be permitted to apply this change retroactively to taxable years beginning after December 31, 2021, offering significant opportunities for amended returns and potential refunds.

    • Planning considerations needed — The legislation modified Section 280C, which now requires that domestic R&E expenditures be reduced by the amount of research credit, creating new planning considerations for businesses claiming R&D tax credits alongside Section 174 deductions.

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The Tax Cut and Jobs Act (TCJA), enacted in December 2017, brought significant changes to Section 174, impacting how businesses account for research and development (R&D) expenditures. With the passage of the One Big Beautiful Bill Act earlier this year, the landscape has shifted dramatically once again, requiring tax departments to engage in strategic planning and proactive tax management.

Section 174: From immediate expense to amortization

First enacted in 1954, Section 174 allowed for the deduction of expenditures related to R&D in the year the expense occurred. The TCJA eliminated the ability to deduct R&D costs as an expense in the year incurred, requiring costs to be amortized over five years for domestic research and 15 years for research outside of the United States.

Over the years, the IRS released guidance several times on how best to approach Section 174’s R&D capitalization. The most recent substantive guidance came in Notice 2023-63 (in September 2023), which provided interim guidance on the capitalization and amortization of specified research or experimental expenditures; and Notice 2024-12 (December 2023), which clarified the earlier guidance. Additionally, Revenue Procedure 2025-8 (December 17, 2024) provided updated procedural guidance for taxpayers filing automatic accounting method changes related to Section 174 expenditures.

Since the changes to Section 174 took effect in 2022, businesses have struggled to track R&D costs, including what should be excluded or included. This shift created cash flow challenges for innovation-driven industries, leading to widespread calls for reform.

The One Big Beautiful Bill Act: A game-changer for R&D expensing

The One Big Beautiful Bill Act (OB3) that was signed into law by President Trump on July 4th, brought sweeping changes to the tax treatment of domestic R&D expenditures. Under a new addendum, Section 174A, capitalization is no longer required for qualified domestic research activity for tax years beginning after December 31, 2024.

This represents a major victory for businesses that have been lobbying for relief from burdensome amortization requirements. For many businesses, this change will simplify tax compliance, improve cash flow, and reduce overall tax liability.

Importantly, amounts paid or incurred in connection with software development are treated as R&E expenditures eligible for immediate expensing, which can provide particular relief to technology companies and startups. However, research or experimental expenditures attributable to research conducted outside the United States must continue to be capitalized and amortized over 15 years, creating a bifurcated system that requires careful tracking of domestic R&D activities, compared to foreign activities.

The OB3 legislation also includes particularly generous provisions for small businesses. Small taxpayers — those defined by a gross receipts threshold established in Section 448(c) — can amend tax returns as far back as 2022 to reverse the capitalization of R&E expenses. The Section 448(c) threshold is adjusted annually for inflation; and currently, for tax years beginning in 2025, the threshold is $31 million in average annual gross receipts over the prior three tax years.

For all taxpayers that made domestic research or experimental expenditures after December 31, 2021, and before January 1, 2025, will be permitted to elect to accelerate the remaining deductions for such expenditures over a one-year or two-year period, providing flexibility in managing taxable income.

Planning for the new landscape

While the OB3 provides welcome relief, corporate tax professionals must remain vigilant and proactive. The legislation introduces new complexities, particularly around Section 280C interactions. The change mirrors the Section 280C rules that were in place prior to the enactment of TCJA in 2017, although taxpayers still have the option to make an election under Section 280C that would reduce their research credit by the maximum corporate tax rate (21%) in lieu of reducing their domestic R&E expenditures.

Here are other key considerations for corporate tax department leaders navigating the new Section 174A landscape:

Understanding qualified research — Tax departments must understand what is considered qualified research and development under the new rules. This involves staying current on all guidelines issued by tax authorities and working closely with the company’s R&D team. Critically, teams must now distinguish between domestic and foreign R&D activities, as the tax treatment differs significantly. This information should be communicated to upper management when considering product expansion or enhancements.

Documentation & recordkeeping — Concise documentation of any expense activity remains essential. Tax departments should capture now and decide later — because it’s better to have the data than not. For any R&D activity that takes place outside of the US, all data should be captured separately from domestic activities. Corporate tax departments should systemize documentation, collection, and storage of R&D expense-related information.

Amended return opportunities — Small businesses should immediately evaluate whether they qualify for retroactive relief and assess the potential benefits of amending their returns for the years 2022 through 2024. Even larger taxpayers should analyze whether electing to accelerate remaining unamortized amounts into 2025 or splitting them between 2025 and 2026 provides optimal tax outcomes.

Section 280C planning — Departments must carefully model the interaction between R&D tax credits and Section 174A deductions. The restored reduction requirement means businesses must evaluate whether making the Section 280C election to reduce the credit rather than taking the deduction would provide better overall tax results.

Scenario planning — Departments should develop multiple financial models based on different elections and timing strategies. This will help the company understand the range of impacts these changes will have on cash flow, net operating losses, and overall tax liability.

The OB3 represents a major course correction for R&D tax policy, but it requires tax professionals to adopt a proactive approach to maximize benefits. Corporate tax departments can navigate these changes effectively by staying informed about legislative developments, engaging in continuous learning, and leveraging advanced tax planning strategies. Also, collaboration with internal teams and external advisors will be crucial in identifying opportunities and mitigating risks.

Ultimately, establishing a proactive and nimble mindset will enable corporate tax professionals to optimize their positions and drive business success in this evolving regulatory landscape.

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You can find more about how the One Big Beautiful Bill Act has impacted tax issues here