CP268 tells you we made changes to your return because we believe there is a miscalculation on your return. You can find the CP or LTR number on the right corner of the letter.An overpayment is caused when Texas Workforce Commission (TWC) pays unemployment benefits that you were not eligible to receive. Get free tax help from the IRS. File your taxes, get help preparing your return, help yourself with our online tools, find your local office – or call us. If you repaid part or all of an overpayment, the IRS allows you to deduct the repaid amounts on your income tax return. 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.