If your federal tax refund is late, the IRS is paying you 8% annual interest on every day it keeps your money past a 45-day grace period. That rate, compounded daily, applies starting July 1, 2026, according to the agency’s posted quarterly update in Rev. Rul. 2026-10. It is unchanged from the prior quarter and marks the eleventh consecutive quarter the overpayment rate has been announced at 8%, a level not seen before the Federal Reserve’s tightening cycle began in 2022.
The interest is automatic. Taxpayers do not need to file a claim or call the agency. But the amounts add up quickly, and with total individual refunds exceeding $300 billion in recent fiscal years, even modest processing delays carry a real cost for the Treasury.
How the 45-day clock works
Under Section 6611 of the Internal Revenue Code, the IRS has 45 calendar days to issue a refund without owing interest. The clock starts on whichever date is later: the return’s original due date (ignoring extensions) or the date the taxpayer actually filed.
If the agency beats that deadline, no interest is added. If it misses it, interest accrues from that starting date all the way through the date the refund check is issued or the direct deposit lands. The IRS explains this on its interest payments page.
A few examples of how the starting date works in practice:
- You filed on time by April 15. The 45-day window started April 15. If your refund arrived June 15, that is 61 days, meaning 16 days of interest.
- You filed late on August 1 without an extension. The window started August 1. A refund issued November 1 means 92 days, with 47 of those accruing interest.
Where the 8% rate comes from
The rate is not discretionary. Sections 6621 and 6622 of the Internal Revenue Code tie it to a formula: take the federal short-term rate from the first month of the preceding quarter, round to the nearest whole percentage point, and add three points for individual overpayments. For Q3 2026, that formula produced 8%, the same result every quarter since Q4 2023, when rising Treasury yields pushed the short-term rate high enough to lock in that level.
Daily compounding, required by Section 6622, nudges the effective annual yield above the stated rate. At 8% compounded daily, the effective rate is about 8.33% over a full year. That gap matters most for refunds stuck in processing for many months, where the difference between simple and compound interest becomes noticeable.
For perspective, the IRS overpayment rate was just 3% in Q1 2022. The jump to 8% more than doubled the daily cost of every delayed refund.
What the interest looks like in dollars
Here is what the 8% rate means for common refund amounts delayed beyond the 45-day grace period:
- $1,500 refund, 60 days late: roughly $20 in interest.
- $3,000 refund, 90 days late: roughly $59.
- $5,000 refund, 90 days late: roughly $99.
- $3,000 refund, 180 days late: roughly $119.
- $7,500 refund, 180 days late: roughly $298.
These figures are calculated automatically by the IRS and included in the refund payment. The interest portion will appear on a 1099-INT the following January and must be reported as taxable income on your next federal return.
How much this costs the Treasury
The IRS Data Book, published by the agency’s Statistics of Income division, shows that total individual income tax refunds regularly exceed $300 billion per fiscal year. At 8% compounded daily, every $1 billion in refunds delayed by an average of 90 days past the grace period generates roughly $19.7 million in interest.
The Data Book does not break out the interest component from principal refund amounts, so there is no single public figure showing the government’s total interest bill triggered by the 45-day rule. The headline reference to “billions” reflects the mathematical scale implied by hundreds of billions in annual refunds and recurring processing backlogs, not a specific disclosed total. During filing seasons marked by staffing shortages, technology transitions, or surges in amended returns, processing backlogs can push thousands of refunds well past the threshold. Both the Government Accountability Office and the Taxpayer Advocate Service have flagged processing delays in recent annual reports, with the Taxpayer Advocate calling refund timeliness a persistent concern.
What to do if you are still waiting
For taxpayers whose 2025 returns (filed during the spring 2026 season) are still being processed as of June 2026, the 8% rate is working in your favor. Here is what you should know:
- Interest is automatic. The IRS calculates and adds it to your refund. You do not need to request it or file a separate form.
- It is taxable. Refund interest counts as income. You will receive a 1099-INT if the interest portion is $10 or more.
- Amended returns take longer. Form 1040-X filings typically take 16 to 20 weeks to process, which frequently pushes them past the 45-day threshold. The same interest rules apply.
- Check your status. The IRS Where’s My Refund tool and the IRS2Go app provide updated processing timelines. If your e-filed return has been pending for more than 21 days, or a paper return for more than six weeks, the tool will flag whether additional review is underway.
- Verify the interest amount. When your refund arrives, the IRS notice (typically Notice CP12 or the direct deposit detail) should show the interest separately. If you believe the amount is wrong, you can call the number on the notice or contact the Taxpayer Advocate Service.
Why the rate has stayed at 8% for so long
The overpayment rate has held at 8% since October 2023 because the Federal Reserve has kept its benchmark rate elevated through 2024, 2025, and into 2026. Since the IRS formula is pegged to the federal short-term rate, the overpayment rate will not drop until Treasury yields fall far enough to pull the rounded short-term rate below 5%. As of June 2026, bond markets have not priced in cuts steep enough to trigger that shift before the Q4 2026 rate-setting window.
That persistence has drawn attention from budget analysts and congressional oversight committees. Congress controls the IRS budget, and appropriations decisions determine how many employees are available to process returns. Whether the growing interest bill is factoring into those funding debates is a question that remains open. The Taxpayer Advocate’s next annual report to Congress, expected later in 2026, may address aggregate interest costs directly for the first time.
One rule that catches people off guard
A common question: does your state owe interest on a late state refund the same way the IRS does? The answer varies. Some states, including California and New York, have their own statutory interest provisions for delayed refunds, but the rates and grace periods differ from the federal rules. Other states pay no interest at all. If your state refund is also delayed, check your state tax agency’s website for its specific policy. The federal 8% rate applies only to federal overpayments processed by the IRS.
