Domestic research costs in 2026: current deductions and old balances

Domestic research or experimental expenditures paid or incurred in tax years beginning after December 31, 2024 may be currently deductible under Section 174A. That change can matter to businesses developing software, products or processes during 2026, but an expense labeled “development” in the accounting system does not automatically qualify.

The IRS's current law guidance distinguishes domestic research from foreign research and points taxpayers to Revenue Procedure 2025-28 for transition and method procedures.

Separate three different questions

First, identify qualifying domestic research costs for the current year. Second, identify foreign research costs, which are generally still subject to 15-year amortization under Section 174. Third, reconcile any balances from prior years.

Those categories should not be combined into one journal entry. The tax treatment can differ by where research was performed, when costs were incurred and what elections or method changes were made.

A Houston software company, for example, might use both a U.S. development team and an overseas contractor. The location of its headquarters does not make all of that work domestic. Gather contracts, project descriptions and evidence about where the work occurred.

Current expensing and the research credit are different

A deduction for research expenditures is not the same as a research credit. Credit eligibility, documentation and coordination rules need a separate review. Do not promise a refund merely because the business has software-development payroll.

Prepare a project list with the business objective, personnel, locations, contractor costs and accounting categories. Have the preparer determine which costs fall within the applicable tax provisions rather than classifying an entire department by its name.

The retroactive election window is not still open

Revenue Procedure 2025-28 provided procedures for eligible small businesses to apply the domestic research change retroactively to certain earlier years. The general election deadline was July 6, 2026, and refund limitation periods could impose an earlier deadline.

As of this article's September 5, 2026 review, that general deadline has passed. An article telling every small business to amend earlier years “now” would be misleading. Review the actual filing history and any timely elections already made. Do not assume late relief exists.

Other transition choices concerning remaining balances have their own conditions. They should be reviewed independently of the expired retroactive election window.

Records to assemble

Bring the prior returns, amortization schedules, election statements, accounting-method documents, project cost detail and domestic-versus-foreign support. Reconcile opening balances to the previous return before deciding how any amount flows into 2026.

Tax N Tips can help organize the financial records for a business tax review. Book a consultation to identify the missing documents and whether a specialist research-credit analysis is needed.

Sources checked September 5, 2026.