Decode any IRS account transcript transaction code (TC 150, TC 290, TC 570, TC 766, TC 846, TC 922, TC 971…) in plain English. Built for tax preparers reading client account transcripts and trying to understand what the IRS is actually doing.
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IRS Account Transcripts list transactions chronologically with a Transaction Code (TC), date, and amount. To get a transcript: IRS.gov → "Get Transcript Online" or "Get Transcript by Mail", or for tax pros: e-Services TDS. Read transactions in cycle order (cycle date is the YYYYWWDD format). This decoder explains what each code means but does NOT replace reading the full transcript in context — combinations of codes tell the real story (e.g., TC 570 + TC 971 + TC 922 usually means underreporter case opened; TC 290 + TC 196 means additional assessment with interest). When in doubt, pull a full account + return transcript together.