Definition
Transaction Code 150. Indicates that the original return was filed and the tax was assessed. The TC-150 date is the starting point for CSED calculation.
What it means for a resolution case
Every collection-statute clock starts here. If TC-150 is missing, the year may be unfiled or SFR — do not quote a program until assessment posture is clear.
Related codes
Where RESO uses it
Core Discovery reads these postings from Account transcripts and surfaces them as findings — not as a raw code list. The ledger stays Tier IRS. Client memory does not overwrite it.
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