IRS Notice CP12 – Changes to Your Form 1040

The IRS sends CP12 when it changes your original return due to an error, resulting in a refund or a refund amount different than you expected.

View notice image

Type of Notice: Return accuracy

Most common tax problem area: IRS return and account problems

Other tax problem areas: N/A

Why you received IRS Notice CP12

  1. You filed a tax return with the IRS.
  2. When processing your return, the IRS discovered a miscalculation.
  3. The IRS corrected the error and made an adjustment to your return.
  4. CP12 was sent to notify you that the adjustment resulted in a refund or a different refund amount. The IRS will issue the refund in four to six weeks.

Your options to address IRS Notice CP12

No response required

Notice deadline: 60 days

If you miss the deadline: If you do not dispute the changes on a CP12 within 60 days, the IRS will not reverse the adjustment without substantiation and you will lose your right to appeal the IRS decision.

Want more help?

See your local tax pro for a free consultation.

Related Topics

Related Resources

IRS Letter 566D – Initial Contact Letter

Learn more about letter 566D, why you received it, and how to handle an IRS audit with help from the tax experts at H&R Block.

Tax Dictionary – Delinquent Business Returns

Does your business have delinquent (unfiled) returns? Read the IRS definition and get more insight from the experts at H&R Block.

Tax Dictionary – Garnish

Get the facts from H&R Block about wage garnishments, which require your employer to withhold some of your wages and send the funds to the IRS.

Tax Dictionary – Affordable Care Act Penalty

Learn about the Shared Responsibility Payment, sometimes called the Affordable Care Act Penalty. Get the facts from the experts at H&R Block.