Reminder:
Internal Revenue Manual Part 25. Special Topics · 2026-10-03 edition · updated 2026-10-04 · United States
Closing an account with a TC 971 AC 506 will not generate a systemic closing letter in most instances.
IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
(2) If a Letter 5064C, Letter 5073C, or CP 01S was not issued previously providing the taxpayer with an IDT Toll-free numberORWhen corresponding with an individual under age 18
IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
(3) If the taxpayer’s correspondence contains questions that will not be addressed by the CP 01/CP 01C
Answer taxpayer’s question and include IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
(4) The resolution was not what the taxpayer anticipated (i.e., NOIDT determination, disagreed with information TP provided)
IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
(5) There is an additional requirement in the corresponding functional IRM
Telephone number based on the functional guidance
(6) International taxpayers
When issuing Letter 4674C, include paragraph (r).
(7) You are closing the case as previous action
IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
(8) The case is for an individual under age 18
IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
(9) Corresponding with an unauthorized third party
IDTVA Toll-free number ≡ ≡ ≡ ≡ ≡ ≡ ≡ ≡ with employee’s name, six-digit extension and TOD
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