IRS Notice Guide
CP11
CP11 — Adjusted Refund Notice
Act Within Deadline — Respond within 60 days
What This Notice Means
The IRS changed your tax return and reduced your refund (or created a balance due). They found a math error or an issue with a credit you claimed.
⏰ Response Deadline: 60 days
Respond by this deadline to resolve the issue and avoid additional penalties.
What to Do
- 1
Review the changes the IRS made to your return
- 2
If you agree, no action is needed (your refund will be reduced or you owe)
- 3
If you disagree, call or write the IRS with documentation supporting your original figures
- 4
File Form 1040-X if you need to formally amend your return
Guides That Can Help
IRS Notice Response Bundle (CP2000, CP90, CP2501)
Decode and respond to the IRS's most threatening notices.
$1
IRS Audit Response Letter Templates
Respond to an IRS audit confidently — without hiring a CPA.
$1
Need Immediate Help?
Book a free consultation now — an attorney will review your notice.
Book Your Free Consultation
Pick a time below — a licensed Brightside tax attorney will review your IRS notice at no charge.