CP268 tells you we made changes to your return because we believe there is a miscalculation on your return. Locate the closest Taxpayer Assistance Center to you.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. We offer a number of online services to fit your busy lifestyle. The Where's my refund? Tool has the most up to date information available about a taxpayer's refund status. Step 1: Complete the taxpayer information section.