One verification process, several identifiers
This guide covers Letter 5071C, CP5071, and CP5071F. The IRS needs to confirm your identity and whether you filed the return. Letter 6331C is a pilot identifier handled under the Letter 5071C procedures.
Follow your notice's verification route
If your notice offers online verification, start at IRS.gov/verifyreturn. Otherwise use the instructions on your document. Have the notice, the return it identifies, a prior return if available, and supporting tax records ready.
If you did not file that return
Tell the IRS during verification; do not confirm an unfamiliar return as your own. IRS guidance says Form 14039 is not needed when you verify the return unless the IRS tells you to complete it.
Keep your records secure
Do not send identification documents to this website. Navigate to IRS.gov yourself and avoid unsolicited links. Keep confirmation of completed steps. Identity verification is not a promise that every other return-processing issue has been resolved.