MFT-CD 13 has to be calendar year with Reference Number 628.
Note:
Internal Revenue Manual Part 3. Submission Processing · 2026-10-03 edition · updated 2026-10-04 · United States
If more than an occasional Form 3552 is received without this information, refer this matter to the Error Correction supervisor who will contact his/her counterpart in the Account Transfer Function, Accounting Branch, to ensure the correct preparation of Form 3552 in the future.
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