IRS CP21B
Changes to Your Return — Refund Due
The IRS changed your return in your favor — a refund is coming.
Deadline
No immediate action required
Review the notice to confirm the change is correct. If you disagree with the amount, contact the IRS within 60 days.
Important — act before this escalates.
What IRS CP21B Means
CP21B is a favorable notice — the IRS made a change to your tax return that results in a refund being issued to you. This typically happens when the IRS corrects a math error in your favor, adjusts a credit calculation upward, or reverses a prior disallowance.
Common triggers include IRS correction of an EITC calculation, reversal of a withholding discrepancy, or an adjustment resulting from a taxpayer-initiated amended return (Form 1040-X) that was accepted. The notice will state the exact amount of the refund and the change that caused it.
In most cases, no action is required — your refund will be issued by check or direct deposit. However, you should review the change to ensure it is accurate. If the refund is less than expected, or if the IRS's change is incorrect, you can dispute it within 60 days.
What the IRS Can Do If You Don't Respond
- Issue the refund by check to your address on file or via direct deposit
- Apply all or part of the refund to an existing balance on your account before sending the remainder
- Offset the refund against other federal debts (student loans, child support) before issuance
What You Should Do Right Now
- 1
Review the notice to understand what change was made and confirm the refund amount is correct
- 2
Check whether the IRS has a valid mailing address and banking information on file for you
- 3
If the refund is being sent by check, allow 2–4 weeks from the notice date
- 4
If the refund amount seems incorrect or lower than expected, contact the IRS or a tax professional
- 5
If you have other tax balances, the refund may be applied — the notice will indicate this
Resolution Options Available to You
Frequently Asked Questions About IRS CP21B
Do I need to do anything after receiving CP21B?
Usually no — the refund will be issued automatically. Review the notice to confirm the amount and change are correct, then watch for your refund check or direct deposit.
Why did the IRS change my return in my favor?
Common reasons include a math correction, an EITC recalculation, an accepted amended return, or an IRS processing error that was reversed. The notice will specify the line item changed.
Will the refund be applied to an existing balance?
If you have other federal tax balances, the IRS will apply your refund to those balances first before issuing any remainder. The notice will disclose this offset.
What if the refund amount is wrong?
If you believe the IRS's calculation is incorrect, contact a tax professional and respond in writing within 60 days of the notice date with supporting documentation.
Professional References
IRC: IRC §6402 — Authority to Make Credits or Refunds; IRC §6213 — Deficiency Jurisdiction
IRM: IRM 21.5.2 — Account Resolution — Adjustments
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