To correct your return, you must give us your daughter's correct name, social security number, and date of birth. The most common automated adjustment notice is the CP2000 (see sample below).Look at the top right-hand corner of the first page of the notice for the code. If a letter is about a changed or corrected tax return, the taxpayer should review the information and compare it with the original return. Sending an IRS audit reconsideration request? You can find the CP or LTR number on the right corner of the letter. The primary letter we use to request information about a return is Form DTF948 or DTF948O, Request for Information (RFI). If you made a mistake in entering a social security number, a payer's identification number, omitted a form, or misspelled a name, you can correct these errors. You should list clearly and concisely the errors that you believe the IRS made in the notice of deficiency or the notice of determination that was sent to you. Use Form W2 C to correct errors on Form W2, W2AS, W2CM, W2GU, W2VI, or W2c filed with the Social Security Administration (SSA).