Reference

IRS transaction codes for tax resolution

What each common TC code means for a resolution case — CSED, levy, lien, CNC, OIC — with the implication, not just the definition. For enrolled agents, CPAs, and resolution firms.

Why codes, not a dump

A transaction code on an Account transcript is a posting event. Resolution work is what that event does to collection, statute, and the next conversation with the client. Each page below is a DefinedTerm-style note plus the case implication.

All codes

TC-150 · TC-290 · TC-420 · TC-424 · TC-520 · TC-530 · TC-582 · TC-668 · TC-670 · TC-694 · TC-780 · TC-971

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