What does TC 971 mean?
TC 971 is an account-action marker, and the action code beside it identifies the type of action recorded. The IRS uses TC 971 for different purposes, so “971” by itself is not a complete explanation. Some entries relate to a notice or letter, while others identify another account action.
Read the action code, transaction date, description, and any miscellaneous field shown on the transcript. Review nearby entries and match a notice-related entry to the actual IRS letter. The letter tells you what the IRS wants you to do, if anything, and when.

