2021 Document 6209 is a reference guide which contains ADP and IDRS data relative to various components of the IRS. It is updated annually.
Table of Contents PDF
Section 1, Glossary PDF
Section 2, Tax Returns and Forms PDF
Section 3, Tax Return Information PDF
Section 4, Document Locator Number PDF
Section 5, Debtor Master File PDF
Section 6, Initiating and Monitoring Refund Check Tracing Action PDF
Section 7, Automated Non-Master File PDF
Section 8A, Master File Codes - Transaction, MF and IDRS Collection Status, Freeze and IDRS Status 48, Restrictive and Filing Requirements PDF
Section 8B, Master File Codes - Unpostable and Resequence PDF
Section 8C, Master File Codes - Source, Reason, Hold, Priority, Item Adjustment & Credit Reference, NMF Abstract, Underreporter, Process, No Merge Reason, EP PDF
Section 9, Notices and Notice Codes PDF
Section 10, Penalty and Interest Provisions PDF
Section 11, Collection PDF
Section 12, Examination PDF
Section 13, Appeals and TE/GE PDF
Section 14, Integrated Data Retrieval System (IDRS) PDF
Section 15, Other Systems CADE, CADE 2, SCRIPTS, CFOL and FTD PDF
Section 16, Julian Date, Cycle and Notice Calendars PDF
Appendix PDF