Low Risk
Understanding IRS Notice CP21B:
Data Processing Adjustment — Refund Due
and How to Respond
Last Verified:
The Raw Code: What CP21B Actually Says
The IRS made changes to your tax return as requested by you (amended return or phone request). A refund is now due to you.
The Detangler™ — Plain English
You asked the IRS to fix something and they actually did it. Now you're getting money back. This is the rare W in IRS correspondence. Just make sure the refund amount matches what you expected.
What You Must Do Now
Verify the refund amount is correct. If not, respond within 60 days.
Get Free EA AssessmentFrequently Asked Questions
What is IRS Notice CP21B?
The IRS made changes to your tax return as requested by you (amended return or phone request). A refund is now due to you.
What should I do when I receive CP21B?
Verify the refund amount is correct. If not, respond within 60 days.
How serious is IRS Notice CP21B?
Low Risk. Review and respond promptly to avoid escalation.