Recommended Free Tools
Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
IRS refund interest is generally due when the agency takes longer than the applicable 45-day period to issue an overpayment refund. If the IRS paid you too little interest, you can ask it to review the calculation with an informal written claim or Form 843; the request must reach the IRS within six years of the scheduled overpayment date. A late refund by itself does not mean you should automatically file Form 843: first check the refund history, the interest already paid, and whether the underlying tax return needs correction.
When does the IRS owe interest on a refund?
The IRS generally pays interest when it does not issue an overpayment refund within the applicable 45-day administrative period. If it issues the refund within that period, interest generally is not paid. The relevant period depends on whether the return was timely filed or late, and on when the IRS received a processible return or a payment that created the overpayment.
As an Amazon Associate I earn from qualifying purchases.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The IRS describes the start date for overpayment interest as the later of the applicable return due date, the date a late return was received, the date a processible return was received, or the date the payment was made. In general, the 45-day window allows the IRS to process and issue a refund without interest. Publication 17 explains that a refund issued within 45 days after the return due date—or within 45 days after a late return is filed—does not earn interest; if the refund takes longer, interest generally runs from the applicable later due date or filing date. See the IRS’s overpayment-interest guidance and Publication 17.
This means “late” in everyday terms is not enough to establish that interest is due. The date you expected the money, the time it took to process a return, and the IRS’s applicable start date may not be the same thing. Check the IRS record and compare the interest shown with the dates that apply to your situation.
Popular on Amazon
- Ideal for Gifting
- Ideal for a bookworm
- Compact for travelling
Interest rates are adjusted quarterly. A calculation covering several quarters must use the rate applicable to each period; using only the current rate for the whole delay can produce the wrong result. The IRS Interest page is the source to consult for its current guidance and rates.
How do I check the refund before claiming interest?
Check the refund’s processing history first. The IRS provides refund status through IRS.gov/Refunds, the IRS2Go app, and 800-829-1954. The IRS says status is generally available 24 hours after an electronically filed current-year return, or four weeks after a paper return is filed.
Free tools Windows power users keep installed
One-click scans. No signup required.
- Check the status tool or call. Confirm whether the refund is still processing, has been issued, or was applied to an outstanding liability.
- Gather the IRS notice or refund details. If the IRS sent a notice with instructions, read and follow those directions. The Form 843 instructions warn that a notice may tell you what to do without requiring Form 843.
- Compare the refund and interest amounts. If an interest amount appears on the refund or a notice, preserve that information for your calculation. A delay alone is not proof that the IRS omitted interest.
Interest stops when the IRS refunds the overpayment and interest or offsets the overpayment against an outstanding liability. As the IRS puts it, “We stop paying interest on overpayments on the date we refund your overpayment.” An offset is therefore important when you are reconstructing the dates and amount at issue, even if you did not receive the full overpayment as a direct deposit or check.
How do I claim additional IRS refund interest?
If your records indicate the IRS paid less interest than was due, request a review. The IRS says you may send an informal claim or Form 843, and that the request should include your own computation and the reason for the request on line 7 of Form 843. The IRS Interest page gives a six-year deadline: the request must be received within six years of the scheduled overpayment date.
Also popular on Amazon
- Identify the overpayment and relevant dates. Determine what payment or return created the overpayment, when the return was due or received, when the return became processible if relevant, when any payment was made, and when the IRS issued a refund or applied an offset. Use the later applicable start date under the IRS’s rules rather than assuming interest began on the date you expected a refund.
- Reconcile the IRS’s calculation. Compare the interest shown on the refund or notice against your dates and the quarterly rate applicable to each part of the period. Do not apply one present-day rate to the entire period if it crosses rate changes.
- Choose an informal written claim or Form 843. The IRS allows either route for an additional-interest request. If using Form 843, follow the current instructions and explain the reason for the claim and your computation on line 7.
- Attach or retain supporting records. Include information that lets the IRS follow the dates and calculation, such as a copy of the return, refund notice, proof of payment, amended-return documents if applicable, and prior IRS interest computations. Keep the originals and a complete copy of what you submit. The IRS notes that records such as canceled checks and amended returns can be useful when seeking help.
- Send it early enough to be received on time. The six-year period is a receipt deadline, not simply a date to put the request in the mail. Keep proof of delivery and a copy of the submitted materials.
Form 843 is available with its IRS instructions. The IRS’s instructions and interest page control if a particular notice gives a different procedure or the facts of your case require a different approach.
What should the interest calculation include?
A useful claim makes it possible to see both why interest is due and how you arrived at the amount you believe is missing. It should separate the date question from the rate question: first establish when the IRS’s interest period began and ended, then apply the rates for the quarters within that period.
| Calculation issue | What to establish | Common mistake to avoid |
|---|---|---|
| Start date | The applicable due date, filing or receipt date, processible-return date, or payment date under the IRS’s later-date rule. | Assuming interest always starts on the day the return was filed or on the expected refund date. |
| End date | The date the IRS refunded the overpayment and interest, or offset it against an outstanding liability. | Counting interest through the day money reached your bank if the IRS’s refund date was earlier. |
| Quarterly rates | The IRS rate applicable to each quarter in the interest period. | Applying one rate—especially the current rate—to the entire delay. |
| Amount already paid | Interest shown on the refund or IRS notice, so the request identifies a shortfall rather than repeating the whole refund claim. | Requesting interest without accounting for interest the IRS has already paid. |
The available data does not supply a rate history or a calculator, so a claim should not rely on an invented flat rate or a guessed total. State the dates and rate sources used in the personal computation, and explain any difference from the IRS amount. If the date sequence is complicated—for example, because a return was amended, a payment was made later, or an offset occurred—organize the documents chronologically so the IRS can see which event each date represents.
Should I use Form 843 or Form 1040-X?
Use Form 843 or an informal claim to ask for additional interest that you believe was already due. Use Form 1040-X when you need to correct amounts reported on an individual income-tax return. Form 843 is not a substitute for amending the return that created the refund.
Also popular on Amazon
| Additional interest claim | Correction to an income-tax return | |
|---|---|---|
| Purpose | Ask the IRS to pay interest you believe it calculated or paid incorrectly. | Correct income, deductions, credits, or other amounts reported on a Form 1040-series return. |
| Form or route | Informal written claim or Form 843. | Form 1040-X. |
| Evidence | Interest computation, payment and filing dates, refund or offset details, and relevant IRS notices. | Corrected tax information, supporting schedules, and documents for the amounts being changed. |
| General deadline | The IRS Interest page says the request must be received within six years of the scheduled overpayment date. | A refund claim is generally subject to the later of three years after filing or two years after paying the tax. |
The Form 843 instructions state: “Do not use Form 843 to request a refund of income tax.” They also say not to use it to amend a previously filed income-tax return. If a correction to your return changes the amount or timing of the overpayment, it may also affect the interest calculation, but that does not turn Form 843 into the amendment form. Review the IRS rules for how long you can claim a credit or refund, because the usual refund-claim deadline is distinct from the six-year period stated for an additional overpayment-interest request.
Which deadline applies to my situation?
Do not confuse the deadline for claiming an income-tax refund with the period for asking for additional overpayment interest. The ordinary refund statute is generally the later of three years after filing or two years after paying the tax. The IRS Interest page separately gives six years for an additional-interest request, measured from the scheduled overpayment date.
These rules concern different claims. If you are asking the IRS to correct the underlying tax or pay a refund that has not been allowed, the ordinary refund-claim rule may matter. If the IRS has already determined and refunded an overpayment but you believe its interest calculation was short, the six-year interest-request period is the relevant guidance in the available data. The details can turn on the return, payment, and refund history, so do not assume that one deadline automatically preserves the other type of claim.
What if the IRS has not issued the refund yet?
Start by checking the processing status and any notice rather than submitting Form 843 solely because the refund is taking longer than expected. The IRS says some notices provide instructions that do not require Form 843. If the refund is still pending, the immediate question is its processing status; a request for additional interest is more appropriate when you can identify an overpayment and a possible shortfall in interest paid.
Also popular on Amazon
If the return itself contains an error, use the correction route rather than an interest form. A change to the underlying return can change the refund amount and, in turn, the interest calculation. For eligible amended returns, the IRS says electronic filing is available through tax software, but the right correction method depends on the return and its eligibility. Do not submit Form 843 as a way to amend a Form 1040-series return.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What records should I keep?
Keep a file that supports the timeline, the overpayment, and your calculation. Useful items include:
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →- The filed return and proof of filing or the date a late return was received.
- Payment records, including canceled checks or other proof of when a payment was made.
- IRS refund status details, refund notices, and any notice describing an offset.
- Amended-return materials and related supporting schedules, if an amended return is part of the history.
- The IRS interest amount already paid and your own calculation, with the quarterly rates and date ranges used.
- A full copy of any informal claim or Form 843 and proof showing when the IRS received it.
These records make it easier to distinguish a disagreement about the dates from a disagreement about rates or arithmetic. They also help if the IRS asks for clarification or if you need to establish that your request arrived within the applicable period.
What are the most common mistakes?
- Filing Form 843 just because a refund is slow. First confirm processing history and whether an interest shortfall exists; follow any instructions in an IRS notice.
- Using Form 843 to correct the return. Use Form 1040-X for a Form 1040-series correction. Form 843 is not an income-tax refund or amendment form.
- Using the wrong start date. Apply the IRS’s later-date rule to the actual return and payment history instead of counting from an assumed date.
- Using a single rate for a multi-quarter period. IRS overpayment rates change quarterly; use the rate for each relevant period.
- Missing the receipt deadline. The IRS says the additional-interest request must be received within six years of the scheduled overpayment date. Retain delivery proof.
- Ignoring an offset or prior interest payment. Both can affect the amount and the end date of the calculation.
If your dates, an amended return, or an offset make the calculation difficult to reconstruct, consider asking a tax professional for help with an IRS refund-interest claim. The records and explanation still matter: a professional should be able to identify the claimed period, the IRS amount already paid, and the basis for the requested adjustment.
Also popular on Amazon
- It can be a gift option
- Comes with secure packaging
- Helpful in various ways
Frequently Asked Questions
Can I send an informal letter instead of Form 843?
Yes. The IRS says an informal written claim is an option for requesting additional overpayment interest. It should explain why you believe the amount is short and include your calculation; if you use Form 843, the IRS directs taxpayers to put the reason and computation on line 7.
Does the IRS pay interest if it applies my refund to a tax bill?
The IRS says interest stops when it refunds the overpayment or offsets it against an outstanding liability. An offset can therefore be part of the refund history even when no check or direct deposit for the full amount arrives.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteCan I claim interest if I filed an amended return?
An amended return can change the underlying refund amount and may affect a later interest calculation. Use Form 1040-X to correct the income-tax return; Form 843 is not the form for amending it.
Where can I find the quarterly interest rates for older periods?
The IRS Interest page is the source for its overpayment-interest guidance and quarterly rates. Because rates change quarterly, identify the dates in your calculation and use the rate that applied to each period rather than extending today’s rate backward.
