VALID › Notice Library › CP125 notice

In the IRS’s own words · not reviewed by VALID

CP125 notice explained, in the IRS’s own words

We made changes to your tax return because we found a miscalculation.

Read the full CP125 page on irs.gov ↗

Quoted from www.irs.gov/individuals/understanding-your-cp125-notice, read October 15, 2026 · fingerprint 9747a29d9fde · 2 lines left out here (see irs.gov)

What this notice is about

We made changes to your tax return because we found a miscalculation.

What you need to do

  • Read the notice carefully.
  • Compare the figures on the notice with your tax return.
  • Contact us within 30 days of the date of your notice if you disagree with the changes we made.
  • Correct the copy of your tax return you kept for your records if you agree with our changes.

You may want to

  • Download copies of the following materials (if they weren’t included with your notice).
  • Publication 1, Your Rights as a Taxpayer PDF
  • Notice 746, Information About Your Notice, Penalty and Interest PDF
  • Instructions for Form 2290 PDF, for a Form 2290 filing
  • Instructions for Form 706 PDF, for a Form 706 filing
  • Instructions for Form 709 PDF, for a Form 709 filing
  • Form 730, Monthly Tax Return for Wagers PDF, for general information on your Form 730 filing
  • Form 11-C, Occupational Tax and Registration Return for Wagering PDF, for general information on your Form 11-C filing
  • Visit us at Forms, instructions & publications to download other tax forms and publications you need.
  • Call 800-TAX-FORM (800-829-3676) to request forms and publications by mail.

How can I find out what caused my tax return to change?

Call us at the toll-free number on your notice for specific information about your tax return.

What should I do if I disagree with the changes you made?

If you disagree, call us at the toll-free number on your notice or write to us at the address on the contact stub within 30 days of the date of the notice. We can reverse the change to your account if your response provides additional information that justifies a reversal. If you agree with the change, you don’t need to do anything; however, you should update your records.

Tips for next year

  • Consider filing your taxes electronically. Filing online can help you avoid mistakes.
  • Review your return for accuracy before mailing it to us.

What to do next

  • Write down the date on the letter today.
  • Look the number up on irs.gov yourself. Don’t trust a link or phone number from anyone else.
  • If it says you owe money or proposes changes to your return, take it to a licensed CPA, EA or tax attorney before that date.

Not advice. Not a filing. Verify with a licensed professional. Rules change by year and facts.

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