Note:

The Individual Retirement Account File (as a separate Master File) was retired in 2004. All references to "MFT 29" are what were previously referred to as IRAF.

If the date is blank and the Transaction Code (TC) is a penalty or additional tax, use the date from Field 01-F (23-C Date of Assessment or "Transaction Date" ).

IMPORTANT: A Transaction Code (TC) 150 (i.e., "Tax Assessment Return" OR"Entity Created by a TC 150" ) and a TC 300 ("Examination Tax Assessment" ) must never be on the same assessment. If an assessment (on the paper Error Register) includes BOTH a TC 150 and a TC 300, do as follows:

Reject the document, using Action Code 3.

Attach Form 4227, notating, "includes a TC 150 and a TC 300" , and attach it to the document.

Route the document (with the Form 4227) to Accounting for correction.