Skip to content
ChatProjectCodes

Title›Note:

Undelivered Letter 4281C

Internal Revenue Manual Part 10. Security, Privacy, Assurance and Artificial Intelligence · 2026-10-03 edition · updated 2026-10-04 · United States

Undeliverable procedures must be followed. See IRM 21.3.3.4.11, Undelivered Mail (Accounts Management), for research procedures for undeliverable mail.

If a new address is found, address an envelope with the new address and mail the undeliverable Letter 4281C to the new address.

If a new address is not found, treat Letter 4281C as classified waste.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Export this section
▸Contents — Internal Revenue Manual Part 10. Security, Privacy, Assurance and Artificial Intelligence
Internal Revenue Manual Part 10. Security, Privacy, Assurance and Artificial Intelligence

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.