Code 451: reversal of tc 450 abates previously posted tc 450 in whole or in part..
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Credit. Used on individual (IMF) accounts.
Reversal of TC 450 Abates previously posted TC 450 in whole or in part.
The full Document 6209 entry, as printed
Credit (PJ) I/B Reversal of TC 450 Abates previously posted TC 450 in whole or in part. Posted as part of 370 transaction only.
After code 451
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Questions people ask
What does code 451 mean on my IRS transcript?
Document 6209 calls it "Reversal of TC 450 Abates previously posted TC 450 in whole or in part.".
Sources
Checked against these sources on October 30, 2026.