R&D Expensing: What the July 4, 2026 Deadline Actually Requires Before You File

The One Big Beautiful Bill Act permanently restored immediate domestic R&D expensing under new IRC Section 174A for tax years beginning after December 31, 2024. For manufacturers with average annual gross receipts of $31 million or less, measured across 2022 through 2024, there is a retroactive window to amend returns back to tax year 2022. Most major tax practitioners are treating that window as expiring around July 4, 2026. Miss it and retroactive cost recovery is gone permanently.

The complication your tax team needs to model before filing: if your company claimed R&D credits during the years when costs were capitalized under the old Section 174 rules, the Section 280C interaction requires you to reduce deductible R&D expenses by the credit amount on any amended return. The net benefit is not automatic. Get your tax counsel running those numbers this week.