CP11: We Changed Your Return and Now You Owe More

Why you might get this

• The IRS found and corrected one or more errors on your tax return.
• Because of those corrections, the amount you owe changed and there is now a balance due.
• Common triggers include math errors or mismatched numbers on the return you filed.

The deadline

This notice gives you a limited window to respond. Contact the IRS by the date printed on your notice if you disagree. If you miss that date, you lose your formal right to have the change reversed automatically and your right to take the dispute to the U.S. Tax Court. You can still send supporting documents after that date, and the IRS may reverse the change if they agree with you. To avoid extra interest and penalties, pay the amount owed by the due date shown on your notice.

This notice doesn't carry a fixed response deadline, but it still deserves attention — see what to do below.

What to do

1. Read your notice carefully and find the section that explains what was changed and how it affected what you owe.
2. If you agree, pay the amount owed by the date on your notice to avoid more penalties and interest.
3. If you can't pay in full, set up a payment plan (installment agreement) so you can pay over time.
4. Correct the copy of your tax return you kept for your records, but do not send that copy to the IRS.
5. If you disagree, call the number on your notice by the date shown; the phone is often the fastest way to fix return errors.
6. If the IRS asks for a missing or corrected form, you can fax it while on the phone with them.
7. If you can't pay because of circumstances beyond your control, ask about penalty relief when you call.
8. Check your IRS Online Account to view your balance, make payments, and see your tax records.

What happens if you ignore it

If you don't contact the IRS by the date on your notice, you lose the formal right to have the change reversed and the right to appeal to the U.S. Tax Court. If you don't pay, interest keeps building on the unpaid balance from the date the return was due, and a late payment penalty applies. If the IRS doesn't get information supporting your original return, they may forward your case for an audit.

If you can't resolve the balance or believe the change is wrong, you may qualify for free help from the Taxpayer Advocate Service (TAS) or a Low Income Taxpayer Clinic. You can also authorize someone to represent you before the IRS.

A CP11 notice means the IRS reviewed your tax return, found one or more mistakes, and corrected them. After those corrections, the numbers changed and you now owe money.

Start by reading the notice closely. Look for the section that shows exactly what the IRS changed and how it affected your balance. That tells you whether the change makes sense to you.

If you agree, pay the amount owed by the date printed on your notice to keep penalties and interest from growing. Can't pay it all at once? You can ask to pay over time with a payment plan. Just fix the copy of the return you keep for yourself — don't mail it back.

If you disagree, call the number on your notice by the date shown. Calling is often the quickest way to sort out return errors, and you can fax any missing documents while you're on the line.

If you can't pay because of something outside your control, ask about penalty relief. Free help is also available through the Taxpayer Advocate Service.

Solace can keep an eye on your IRS account so you always know where your balance and notices stand.