IRS Notice CP13: What It Means and What to Do
The IRS corrected what it sees as a mistake on your return, but after the change you owe nothing and are not due a refund. Your balance for that year is zero. You only need to act if you disagree with the change.
CP13 key facts
| Official name | We corrected one or more mistakes on your tax return. You're not due a refund nor do you owe an additional amount because of our changes. Your account balance is zero. |
|---|---|
| Who gets it | Individuals |
| Severity | 2 of 5: Low: check it and respond if asked Nothing is owed and no refund is due, but there is a deadline to dispute the correction. |
| Response window | No response is needed if you agree. If you disagree, contact the IRS at the number on the notice by the date indicated. Under IRC 6213(b)(2)(A), as described in IRM 21.5.4.3, a taxpayer has 60 days from the date of a math error notice to request abatement. |
| Deadline basis | The date printed on the notice. |
Severity is RAHA Financials' own 1 to 5 rating of how urgent the notice usually is. It is not an IRS classification.
How long do I have to respond to a CP13?
Use the date printed on your notice. It is typically 60 days from the notice date. Enter the notice date to see an approximate date.
The date printed on your notice always controls. Open CP13 in the IRS Notice Decoder.
Why did I get a CP13?
Common reasons include:
- A calculation error that the IRS corrected during processing
- A credit or refund amount claimed that the IRS reduced so the balance came out to zero
- Inconsistent or incorrectly carried entries on the return
What should I do?
- Read the notice to see what the IRS changed and how it affected your balance.
- Compare the change with your copy of the return and records.
- If you agree, you don't need to respond; update your own copy of the return.
- If you disagree, call the number on the notice before the date shown.
- If you later need to make a different correction, file Form 1040-X.
What documents do I need?
- The CP13 notice
- Your copy of the tax return
- Documents supporting the changed line, such as W-2s, 1099s or credit worksheets
What should I avoid?
- Don't assume a zero balance means the change doesn't matter; if the IRS removed a refund you expected, the deadline still applies.
- Don't send a corrected return copy to the IRS in response.
What if I disagree with a CP13?
Contact the IRS at the number on the notice by the date indicated. The IRS page says it will reverse most changes if they increased the amount you owe or reduced a refund you requested, and that missing the date means you lose formal rights to have the change reversed and to appeal to the U.S. Tax Court. The statutory window is 60 days from the notice date (IRC 6213(b)(2)(A), IRM 21.5.4.3); after that, corrections generally require Form 1040-X or another claim.
What happens if I ignore a CP13?
If you agree, nothing further is generally needed. If you disagree and let the deadline pass, the correction generally stands and you lose the formal right to have it reversed or to appeal it to the U.S. Tax Court.
What else should I know about CP13?
A CP13 is easy to set aside because the balance is zero, but a zero balance can hide a lost refund: if your return claimed a refund and the IRS correction wiped it out, this notice is how you learn that. Because it is a math error notice, the 60-day abatement window in IRC 6213(b)(2)(A) (IRM 21.5.4.3) is your formal chance to get the refund back, and the IRS page says it reverses most such changes when you contact it in time.
Want a professional to handle your CP13 response?
IRS Notice Response Plan
Fixed price, quoted before any work startsFixed fee.
- Review of your notice and account transcript
- A written plan: agree, partly agree, or dispute
- Draft response and list of supporting documents
- Deadline tracking so nothing lapses
CP13: frequently asked questions
Do I have to do anything?
Not if you agree. The IRS says you don't need to respond to the notice.
How can I find out what caused the changes?
Review the section of the notice explaining what was changed, and call the number listed if you need more detail.
What if I disagree?
Contact the IRS by the date on the notice. The IRS says it will reverse most changes that increased what you owe or affected a refund you requested, but you lose formal reversal and Tax Court rights if you miss the date.
How do I make another correction?
File Form 1040-X, Amended U.S. Individual Income Tax Return.
