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. A letter from the IRS will require some kind of response, perhaps even a payment or a payment arrangement. And you can't just sit on such letters. You can find the CP or LTR number on the right corner of the letter. You must complete IRS Form 8379 to get your share of the refund. The Where's my refund? Tool has the most up to date information available about a taxpayer's refund status.