# IRS notice CP21B: the IRS made the change you asked for and you are due a refund Source: https://taxrefunddesk.com/amended-returns/irs-cp21b-notice Publisher: Tax Refund Desk (taxrefunddesk.com), independent editorial site Topic: Amended Returns Last updated: 2026-10-20 > An IRS notice CP21B means the IRS made the changes you asked for, usually on an amended return (Form 1040-X), and the adjustment left you with a refund. The IRS says the refund should arrive within 2 to 3 weeks of the notice, unless you owe other taxes or debts it must collect. If you agree with the changes, you do not need to reply; if you disagree, call the number on the notice. ## Key facts - What CP21B means: The IRS made the changes you requested and a refund is due - Refund timing: Within 2 to 3 weeks of the notice (IRS) - If you agree: No reply needed; correct your copy of the return - If you disagree: Call the number in the What you need to know section - Interest: Taxable; Form 1099-INT if $10 or more, by January 31 ## What does an IRS notice CP21B mean? CP21B is the notice the IRS mails after it changes your return at your request and the result is money back to you. The request is usually an amended return filed on Form 1040-X, Amended U.S. Individual Income Tax Return. The notice lists the changes the IRS made and the refund it is sending. A CP21B is not a bill and not an audit. The CP21 family has several versions that look alike, so check the notice number in the corner of the first page against this table before you act. | Notice | Why the IRS changed the return | Result | | --- | --- | --- | | CP21A | You requested the changes | You owe a balance; pay by the date on the notice | | CP21B | You requested the changes | You are due a refund | | CP21C | You requested the changes | Your balance is zero; no refund and nothing owed | | CP12 | The IRS corrected errors while processing your return | Your refund changed; expect it in 4 to 6 weeks if you agree | CP21 notices and the CP12 compared (IRS notice pages) If your notice is a CP12, the IRS found the mistakes itself rather than acting on a request. Our page on the [IRS CP12 notice](https://taxrefunddesk.com/reduced-refunds/irs-cp12-notice) covers that case and its deadline for disagreeing. ## How long after a CP21B notice will I get my refund? The IRS says to expect the refund within 2 to 3 weeks of the notice. That window holds only if you do not owe other federal taxes or debts the government must collect, such as past-due child support; those can be taken from the refund first through an offset. How the money arrives depends on how you amended. The IRS pays an amended refund by direct deposit only when the Form 1040-X was e-filed with bank details for tax year 2021 or later; a paper 1040-X is refunded by check, as our page on [amended return refund direct deposit](https://taxrefunddesk.com/amended-returns/amended-return-refund-direct-deposit) explains. If 3 weeks have passed since the notice date, you owe no other taxes or debts and nothing has arrived, the IRS says to call the number on your notice. For a check that was issued but never reached you, the trace steps on our [tax refund not received](https://taxrefunddesk.com/missing-refunds) page apply. ## What should you do after getting a CP21B? 1. Compare each change listed on the notice with the Form 1040-X you filed. 2. If they match, you do not need to contact the IRS. Correct the copy of the return you keep, so next year's figures start from the right numbers. 3. Watch for the refund within 2 to 3 weeks of the notice date and check the amount against the notice. 4. Keep the notice with your records for that tax year, because it shows any interest included in the refund. 5. Report any interest the IRS paid you on the return for the year you receive it. If you were tracking the amendment in Where's My Amended Return, the notice usually lines up with the tool moving to Completed. Our guide to [Where's My Amended Return](https://taxrefunddesk.com/amended-returns/wheres-my-amended-return) explains each status. ## What if you disagree with a CP21B or did not ask for the change? If you disagree with the changes, call the IRS at the number printed in the What you need to know section of the notice. If you do not remember asking for a change, call the same number to find out what the IRS received. If you think someone else filed a return or an amended return in your name, the IRS says to call the number on the notice and use its Identity Theft Central pages. Our guide to [IRS refund identity verification](https://taxrefunddesk.com/identity-verification) covers the letters that can follow. If you find a different mistake, one the IRS did not fix, the IRS says to file another Form 1040-X. Let the first adjustment finish before you send it, so Column A of the new form can start from the figures the IRS allowed; our [Form 1040-X guide](https://taxrefunddesk.com/amended-returns/form-1040-x-how-to) shows how. > **Use the phone number on the notice:** A real CP21B tells you a refund is coming and does not ask you to pay anything to release it. Call only the number printed on your own notice, not one from a search result, a text or an email. ## Is the interest on a CP21B refund taxable? Yes. An amended refund often arrives long after the original due date, so the IRS may include overpayment interest. The IRS says any interest it pays must be reported on your return, and it sends Form 1099-INT by January 31 of the next year when the interest is $10 or more. Our page on [whether IRS refund interest is taxable](https://taxrefunddesk.com/refund-options/refund-interest-taxable) shows where it goes on Form 1040. On your tax account transcript for the year you amended, the adjustment appears as TC 290 or TC 291, any interest as TC 776 and the refund as TC 846, after the TC 977 that records the amended return. Our [amended return transcript](https://taxrefunddesk.com/amended-returns/amended-return-transcript) page walks through a worked example. ## Common questions ### How long does it take to get a refund after a CP21B? The IRS says within 2 to 3 weeks of the notice, as long as you do not owe other federal taxes or debts it is required to collect. ### Do I need to respond to a CP21B notice? Only if you disagree with the changes or did not request them. If the changes match what you asked for, no reply is needed; just correct your own copy of the return. ### Is a CP21B the same as a CP12? No. A CP21B follows changes you asked for, usually on an amended return. A CP12 follows corrections the IRS made on its own while processing your original return. ### Why is my CP21B refund different from my amended return? The refund can include overpayment interest, or part of it can go to a debt through an offset. The notice lists the changes the IRS made; if they do not match your Form 1040-X, call the number on the notice. ### What if I got a CP21B but no refund after 3 weeks? If you owe no other taxes or debts, the IRS says to call the number on your notice once 3 weeks have passed. If part of the refund went to a non-tax debt, the Bureau of the Fiscal Service sends a separate offset notice. ## Sources - [Understanding your CP21B notice](https://www.irs.gov/individuals/understanding-your-cp21b-notice) - [Understanding your CP21A notice](https://www.irs.gov/individuals/understanding-your-cp21a-notice) - [Understanding your CP21C notice](https://www.irs.gov/individuals/understanding-your-cp21c-notice) - [Where's My Amended Return?](https://www.irs.gov/filing/wheres-my-amended-return)