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. Locate the closest Taxpayer Assistance Center to you. You get an overpayment credit when your tax payments exceed what you owe. You'll automatically receive a refund of the credit. Customer service representatives are available to assist you Monday through Friday during normal business hours. Explore options for getting your federal tax refund, how to check your refund status, how to adjust next year's refund and how to resolve refund problems. Get your refund status. Repay your Social Security Overpayment.