CP268 tells you we made changes to your return because we believe there is a miscalculation on your return. We corrected one or more mistakes on your tax return.As a result, you are now either due a refund or your original refund amount has changed. Locate the closest Taxpayer Assistance Center to you. There are two main ways to file a refund claim for overpayment of taxes. We're auditing your tax return and need documentation to verify the Earned. Income Credit (EIC), dependent exemption(s) and filing status you. You get an overpayment credit when your tax payments exceed what you owe. You'll automatically receive a refund of the credit. The IRS Independent Office of Appeals is here to resolve disputes, without litigation, in a way that is fair and impartial to the government and to you.