State tax refund interest is taxable federal income, but only if you itemized deductions when you originally filed
Interest paid on a state tax refund is taxable as federal income in the year you receive it. The IRS treats refund interest the same way it treats interest from a savings account or bond—as ordinary income that must be reported on your federal return. However, there is one major exception: if you took the standard deduction instead of itemizing deductions on the original return where you overpaid state tax, the interest is not taxable to you.
The reason for this exception is the tax benefit rule. If you did not itemize deductions, you received no federal tax benefit from paying the state tax in the first place, so the interest on that refund is not taxable. If you did itemize, you deducted the state tax payment on your federal return, got a federal tax benefit, and now the interest is taxable income to offset that benefit.
Most people take the standard deduction, which means most state refund interest is not taxable. But if you itemize—usually because you own a home with a mortgage, have high medical expenses, or live in a high-tax state—you need to report the interest.
Key Takeaways
- State refund interest is taxable federal income only if you itemized deductions on the return where you overpaid state tax.
- The IRS sends you a Form 1099-INT or similar document showing the interest amount when the state pays it to you.
- You report this interest on Schedule 1 (Form 1040) as "other income" in the tax year you receive the refund.
- If you took the standard deduction, you do not report the interest as income, even though you received it.
How to know if you itemized on the original return
Pull up the federal return you filed for the year you overpaid state tax. Look at Schedule A (Form 1040), which is the itemized deductions form. If you filed Schedule A and claimed state and local tax deductions (SALT), you itemized. If you did not file Schedule A, or if Schedule A shows zero deductions, you took the standard deduction and the refund interest is not taxable.
If you filed jointly with a spouse, check whether the joint return itemized. The rule applies to the household, not the individual. If the joint return itemized, both spouses report their share of the interest.
Your tax software or preparer should have a copy of that old return. If you filed yourself, check your records or download it from the IRS website using Get Transcript (irs.gov/transcripts). The transcript shows whether you itemized.
What document the state sends and when
When a state refunds your overpaid tax plus interest, the state revenue department issues a Form 1099-INT (or sometimes Form 1099-MISC) showing the interest portion. This document goes to you and to the IRS. The state typically sends it by January 31 of the year following the refund.
Some states do not issue a 1099 for refund interest under a certain dollar amount—often $10 or $25. Check your state's rules. Even if the state does not issue a form, if you received interest, you may still owe federal tax on it if you itemized.
The 1099 will show the interest in Box 1 (interest income). The state name and the fact that it is refund interest should appear in the description. Keep this document with your tax records.
How to report the interest on your federal return
If you itemized deductions on the original return, report the interest as income on your current-year federal return. On Form 1040, this goes on Schedule 1, line 8 (other income). Write "state tax refund interest" and the amount.
If you received a 1099-INT from the state, the IRS already has a copy. Your return must match the 1099, or you may receive a notice. If the 1099 amount is wrong, contact the state revenue department and ask them to issue a corrected 1099-INT.
If you did not itemize, do not report the interest. You received no federal benefit from the state tax payment, so the interest is not taxable to you under the tax benefit rule.
The tax benefit rule explained
The tax benefit rule says you only report income that reverses a tax benefit you previously received. When you overpaid state tax and itemized deductions, you reduced your federal taxable income by claiming that state tax. The refund of that overpayment is a return of your own money, so it is not taxable. But the interest is new income the state paid you for holding your money, and it reverses the benefit you got from the deduction.
Example: You filed a 2022 return, itemized deductions, and claimed $15,000 in state tax paid. That reduced your federal taxable income by $15,000. In 2024, the state refunds $14,500 of that tax plus $300 in interest. The $14,500 refund is not taxable (you already deducted it). The $300 interest is taxable in 2024 because you got a federal benefit from the original $15,000 deduction.
If you had taken the standard deduction instead, you would have received no federal benefit from the $15,000 state tax payment. The refund and interest would both be non-taxable.
What happens if you itemized in some years but not others
If you overpaid state tax in Year A but did not file your return until Year B, the rule applies to the year you filed the return, not the year you paid the tax. Check the return you actually filed.
If you itemized in Year A but took the standard deduction in Year B, and the state refunds the overpayment in Year C, the rule looks back to Year A (when you paid the tax and itemized). You report the interest in Year C because you itemized in the year the overpayment occurred.
If you are unsure which year applies, look at the state's refund notice. It should say which tax year the overpayment was from. Match that to the federal return you filed for that year.
State refund interest versus federal refund interest
Federal tax refund interest (interest the IRS pays you on an overpayment) is always taxable, regardless of whether you itemized. The tax benefit rule applies only to state refund interest. This is because federal interest is paid by the government on a federal tax overpayment, and the IRS treats it as ordinary income.
If you received both a state refund with interest and a federal refund with interest in the same year, report the federal interest on Schedule 1 as well. The state interest is taxable only if you itemized; the federal interest is taxable no matter what.
Frequently Asked Questions
Do I have to report state refund interest if the amount is very small?
If you itemized deductions on the original return, yes—report it even if it is $5 or $10. The IRS has a copy of the 1099-INT the state issued, and your return must match. If the state did not issue a 1099 because the amount was below their threshold, you still report it if you know you received it.
What if I cannot find the original return to check if I itemized?
Contact the IRS at 800-829-1040 or use Get Transcript at irs.gov/transcripts. You can order a transcript of the return you filed for the year the overpayment occurred. It will show whether you itemized. You can also ask your tax preparer if they have a copy on file.
Can I deduct the state refund interest as a loss?
No. If you itemized, you report the interest as income. You cannot deduct it. The tax benefit rule is one-way: you report the interest to offset the federal benefit you got from the original deduction.
What if the state issued a 1099-INT but I did not itemize?
Do not report the interest on your federal return. The IRS will see the 1099, but you can explain on your return or in response to any notice that you took the standard deduction and the interest is not taxable under the tax benefit rule. Keep a copy of your original return showing the standard deduction as proof.
Does state refund interest affect my federal tax bracket or other calculations?
Yes, if you report it. State refund interest is added to your total income for the year, which can affect your tax bracket, your may be able to access for certain credits, and your Medicare premiums if you are on Social Security. Report it accurately so these calculations are correct.