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Understanding Your CP133 Notice

We made changes to your tax return because we believe there’s a miscalculation on your return. As a result of these changes, there’s an overpayment on your account.

What you need to do

  • Read the notice carefully. It will explain the changes we made.
  • Compare the figures on the notice with your tax return.
  • If you agree with the changes we made, correct the copy of your tax return that you kept for your records.
  • If you don’t agree with the changes, contact us within 10 days from the date of your notice by calling the toll free number listed on your notice or by mailing the completed contact stub with any correspondence or documentation.
  • If you haven’t already, you should receive a refund of the overpayment within four to six weeks if you owe no other taxes or debts we’re required to collect. You don’t need to take any further action.

Answers to Common Questions

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

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

Will I receive a refund of the amount I overpaid?

Yes, provided you owe no other outstanding liabilities which we’re required to collect and the amount of your refund is $1 or more.

What if I don’t receive my refund in four to six weeks?

If you don’t owe other taxes or debts we’re required to collect and six weeks have passed, call us at the toll free number listed on your notice.

Where can I get forms and instructions?

Visit or call 1-800-TAX-FORM (1-800-829-3676).

Tips for next year

  • Refer to the instructions for your tax return for required documentation and how to complete your return. Attach all required forms and schedules to your tax return when filing.
  • Consider filing your taxes electronically. Filing online can help you avoid mistakes and find credits and deductions that you may qualify for. In many cases, you can file for free. Learn more about e-file.

Tax publications you may find useful

Page Last Reviewed or Updated: 01-Jun-2016