Section 174A: Domestic R&D Expensing Is Back for Tax Years After 2024

Domestic research is deductible again in the year it is paid. The IRS depreciation guidance dates the change: tax reform legislation was enacted in "P.L. 119-21, commonly known as the One Big Beautiful Bill Act", on July 4, 2025.^[1] Section 70302 of that law added section 174A, and the rule the IRS states is short: for taxable years beginning after Dec. 31, 2024, a taxpayer may deduct domestic research or experimental expenditures paid or incurred during the taxable year.^[2]

That reverses the capitalization regime a product company had been living under, where domestic research had to be written off across later years while the cash went out immediately. Section 174A moves the domestic half of research spend back to a current deduction and leaves the foreign half where it was, on a long amortization schedule.^[5] Domestic versus foreign is now the pivotal distinction in the rule, and it is the reason a research-heavy business benefits from tax planning before the year closes rather than a scramble at filing.

The trigger is the first day of the taxable year, not the date the bill was signed. The IRS ties the deduction to taxable years beginning after Dec. 31, 2024.^[2] A calendar-year business therefore applies section 174A for the first time on its 2025 return. A fiscal-year business measures from the start of its own year, so a year that began in late 2024 and closed during 2025 is still under the prior treatment for that year.

That one date decides more than it looks. It determines whether a research dollar is deducted at once or parked in an amortization pool, and it determines which return an election has to ride on. It also means the first full filing season under section 174A is the one covering 2025 tax years, so the method and election mechanics carry real weight on a business tax return preparation engagement rather than being a footnote.

Section 174A reaches what the IRS calls "domestic research or experimental expenditures", measured as amounts paid or incurred during the taxable year.^[2] Two tests do most of the sorting. The first is the character of the spend, meaning whether the activity is research or experimental in nature. The second is where the work is performed, because only the domestic side gets the current deduction. Neither test turns on what a company names the department or the cost center.

A second carve-out applies no matter where the work happens. Amounts spent to acquire or improve land, or to acquire or improve depreciable or depletable property, are not eligible under the provision.^[4] Those costs stay inside the depreciation rules and recover on their own schedule. The boundary between a research cost and a capital asset is where most examination disputes begin, so the classification decision belongs in contemporaneous workpapers rather than in a year-end reconstruction.

Immediate expensing is the default and amortization is an election, not the other way around. The IRS sets out the alternative: a taxpayer may elect to capitalize domestic research or experimental expenditures and take an amortization deduction over a period of "no less than 60 months", beginning in the month the taxpayer first realizes benefits from those expenditures.^[3]

Two features of that clock are easy to miss. The period is a floor rather than a fixed term, so a longer write-off is permitted. And the start month is pegged to when benefits are first realized, not to when the invoice was paid, which on a long research program can push the first deduction past the year of the spend. The election tends to suit a business with too little taxable income to absorb a large current deduction, a partnership or S corporation whose owners would otherwise carry suspended losses, or a company that wants deductions to land in the same years as the revenue the research produces. That is a modeling exercise, and it belongs in an advisory solutions conversation before the return is drafted.

Only the domestic side got the new deduction. Foreign research or experimental expenditures cannot be deducted in the year paid; they are capitalized and amortized ratably over a 15-year period that begins with "the midpoint of the taxable year" in which the amounts are paid or incurred.^[5]

The gap that opens up is not small. A dollar of qualifying research performed by a United States team can reduce taxable income in the same year it is spent, while the identical dollar routed to an offshore contractor or a foreign subsidiary comes back over fifteen years, and the midpoint convention costs another half year at the front end. For a company deciding where to seat engineering headcount, that is a cash-tax decision rather than an accounting footnote. It also raises the documentation stakes, because a business running mixed teams needs records made at the time that show where each piece of work was performed. For technology and SaaS startups, this lands first, since payroll is usually the largest research line on the books.

Balances built up under the prior regime were not stranded, and this is where the recoverable money usually sits. The IRS states that "Transition rules and selection procedures" for domestic research or experimental expenditures are set out in Revenue Procedure 2025-28, and the same page identifies the two code sections in play: section 174A for domestic research, and section 174 for the amortization regime that still governs the foreign side.^[6]

The practical consequence is that moving onto section 174A is an election and accounting-method exercise with its own filing mechanics and its own cut-off dates, not a line a business simply starts deducting. Elections attached to the wrong return, or attached after the window closes, are the expensive kind of error here, and parts of the relief are time limited. A business that capitalized domestic research under the old rules and has not revisited it since should put that review on the calendar with an Enrolled Agent well ahead of the filing deadline, alongside the business tax return preparation work itself.

Section 174A is one of three deduction resets that a product-heavy or equipment-heavy business should model together rather than one at a time. The same law delivered a "permanent 100-percent additional first year depreciation deduction" for qualified property acquired after January 19, 2025.^[7] It also raised the amount a taxpayer can elect to expense under section 179 from $1,000,000 to $2,500,000 for property placed in service in tax years beginning after December 31, 2024, reduced that ceiling once section 179 property placed in service passes $4,000,000 in the year, and indexed both figures for inflation for taxable years beginning after 2025.^[8] Indexing has already moved them: for tax years beginning in 2026 the maximum section 179 deduction is $2,560,000 and the reduction threshold is $4,090,000.^[9]

Claiming all three at full stretch in the same year is frequently the wrong call. A business that expenses everything at once can drive taxable income to zero, waste credits that then carry forward without value, and give up deductions it could have used against a higher rate later. State conformity cuts the same way, since not every state follows the federal treatment. The depreciation half of the package is covered in the bonus depreciation and section 179 guide, and the research credit that sits next to the deduction is covered in the Form 6765 research credit guide.