Code 177: abatement of estimated tax penalty.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Credit. Used on individual (IMF) accounts.
Abatement of Estimated Tax Penalty
The full Document 6209 entry, as printed
Credit (NPJ) I/B Abatement of Estimated Tax Penalty Generated Transaction Abates a previously assessed TC 176. Issues Adjustment Notice.
After code 177
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Questions people ask
What does code 177 mean on my IRS transcript?
Document 6209 calls it "Abatement of Estimated Tax Penalty".
Sources
Checked against these sources on October 30, 2026.