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

Field Validity - Interest Computation Date, Interest-to-Date and 2% Interest Date

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

Each of these fields must be all numeric and in YYYYMMDD format. Except for MFT 52, the Interest Computation Dates are invalid when the Year of the Interest to Date or Interest Computation Date is earlier than the Year of the Tax Period or later than the Year of the Process Date. (For MFT 52 Only, the Interest-to-Date and Interest-Computation-Date are invalid when Date is after the Process Date, or Date is before December 1, 1961 (12/01/1961).)

The MM must be 01 through 12. The DD must be 01 through 31. If the month is February, then numerics 30 and 31 are invalid. If the other 2% interest rate applies, the 2% "Interest Date" must be present with Field 01-Q.

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