Note:
Internal Revenue Manual Part 25. Special Topics · 2026-10-03 edition · updated 2026-10-04 · United States
If the TC 971 AC 501 is not input prior to cycle 47 of the processing year, an IP PIN/CP01A may be delayed for the upcoming filing season. Between cycle 47 and January 1 of the following year, IP PIN information must be provided in a closing letter. Barring any unforeseen circumstances, this additional information will not be required in closing letters issued between January 1 and cycle 47. SERP Alerts should be monitored for information related to IP PINs that may impact this timeframe. Use the special paragraphs in Exhibit 25.23.4-25, Closing Letter Paragraph Selections, in addition to the paragraphs selected for your closing Letter 4674C.
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