Note:
Internal Revenue Manual Part 25. Special Topics · 2026-10-03 edition · updated 2026-10-04 · United States
The list below is not all inclusive.
Case Type
Category Code
Program Code
Amended Return
XRET
40051
Duplicate Return
DUPF
40050
Erroneous use of TIN (i.e., inadvertent TP/tax preparer error, or processing error)
MXEN
40054
Scrambled
SCRM
40052
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