To correct your return, you must give us your daughter's correct name, social security number, and date of birth. Learn how to write a letter to the IRS with our comprehensive guide and sample.Includes ChatGPT prompt. Sending an IRS audit reconsideration request? How to Write a Client Letter for a Tax Issue. 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. The primary letter we use to request information about a return is Form DTF948 or DTF948O, Request for Information (RFI). We issue Notice CP12 when we correct one or more mistakes on your tax return, and: The overpayment is different from the one you expected. You generally have 30 days to respond to an IRS notice, so there's no reason to ignore it. Always check which tax year the notice relates to.