After you file

Per the IRS :  https://www.irs.gov/individuals/understanding-your-cp12-notice

Why did I receive this notice?

We issue Notice CP12 when we correct one or more mistakes on your tax return, and:

  • The overpayment is different from the one you expected, or
  • You have an overpayment when you thought you owed money or had an even balance.

How can I find out what caused my tax return to change?
Read your notice carefully. For additional clarification, call us at the number shown on your notice.