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In the IRS’s own words · not reviewed by VALID

CP21B notice explained, in the IRS’s own words

We sent you this notice because we made the changes you requested to your tax return for the tax year specified on your notice. You should receive your refund within 2-3 weeks of your notice.

Read the full CP21B page on irs.gov ↗

Quoted from www.irs.gov/individuals/understanding-your-cp21b-notice, read October 15, 2026 · fingerprint ee5a70a4a2fb · 3 lines left out here (see irs.gov)

What this notice is about

We sent you this notice because we made the changes you requested to your tax return for the tax year specified on your notice. You should receive your refund within 2-3 weeks of your notice.

What you need to do

  • If you disagree with the changes we made, contact us at the number shown in the “What you need to know” section of your notice.
  • Correct the copy of your tax return that you kept for your records.
  • Be sure to report any interest we paid you on your tax return for this year. For more information on reporting interest income, see About Form 1099-INT, Interest Income.

What if I don't receive my refund in 2-3 weeks?

If you don't owe other taxes or debts we're required to collect, such as child support, and 3 weeks have lapsed, call us at number shown in the “What you need to know” section of your notice.

I don't remember sending a request to IRS to change my return. How can I find out what IRS received to initiate this change?

Call us at the number shown in the “What you need to know” section of your notice.

What if I need to make another correction to my account?

You'll need to file Form 1040-X, Amended U.S. Individual Income Tax Return.

What if I haven't gotten answers after contacting IRS several times?

Call the Taxpayer Advocate at 877-777-4778 ​ or for TTY/TDD 800-829-4059​.

What if I think I'm a victim of identity theft?

Call us at the number shown in the “What you need to know” section of your notice. Refer to Identity Theft Central for more information.

Tips for next year

Consider filing your taxes electronically. Filing online can help you avoid mistakes and find credits and deductions that you may qualify for. In many cases you can file for free.

What to do next

  • Write down the date on the letter today.
  • Look the number up on irs.gov yourself. Don’t trust a link or phone number from anyone else.
  • If it says you owe money or proposes changes to your return, take it to a licensed CPA, EA or tax attorney before that date.

Not advice. Not a filing. Verify with a licensed professional. Rules change by year and facts.

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