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MFT-CD 13 has to be calendar year with Reference Number 628.›Reminder:

Field 01-K---TIN Type

Internal Revenue Manual Part 3. Submission Processing · 2026-10-03 edition · updated 2026-10-04 · United States

This field must contain a "0" (Zero) when the MFT (Field 01-C) contains an SSN (Social Security Number) or remain blank when it contains an EIN (Employer Identification Number).

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▸Contents — Internal Revenue Manual Part 3. Submission Processing
Internal Revenue Manual Part 3. Submission Processing

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