Note:
Internal Revenue Manual Part 25. Special Topics · 2026-10-03 edition · updated 2026-10-04 · United States
Use the most recent date as the date of correspondence if multiple correspondence are being answered for the same tax period. See IRM 21.3.3.4.2.3, Correspondence Date (Corr Date), for additional information.
If a case cannot be completed within the number of days specified in the acknowledgement letter, an interim Letter 5064C, IDTVA In-Process Letter, must be sent. Interim letters will need to be issued no earlier than 606 days (minus 5 days from 611) after the IRS received date and should inform the taxpayer when a final response can be expected. Provide a contact name and number for additional inquiries if it was not previously provided or has changed. See IRM 21.3.3.4.2.2, Interim Responses, for additional information.
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