MFT-CD 13 has to be calendar year with Reference Number 628.
Reminder:
Internal Revenue Manual Part 3. Submission Processing · 2026-10-03 edition · updated 2026-10-04 · United States
Use the procedures in Paragraph (7) below to identify the originator (to whom the Form 4227 (and document) should be sent for research and correction).
If the date is correct as transcribed and Field 01-F is in error, determine the correct date or tax period. Enter the information on the register with Action Code 6.
If the correct data can't be determined, reject the register with Action Code 3. Attach Form 4227 and notate "invalid or missing Assessment date" .
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