CP268 tells you we made changes to your return because we believe there is a miscalculation on your return. You can get in-person help at your local IRS Taxpayer Assistance Center.Call for an appointment after you find a Taxpayer Assistance Center near you. You get an overpayment credit when your tax payments exceed what you owe. You'll automatically receive a refund of the credit. Locate the closest Taxpayer Assistance Center to you. Please allow 3 to 4 months of processing time. For details about the debt, taxpayers must call the agency listed on the intercept notice we sent. First things first, taxpayers will need to call 8445455640 to schedule an appointment. The overpayment on your tax return is not enough to cover all contributions you requested.