Code 350: negligence penalty i/b:.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Debit. Used on individual (IMF) accounts.
Negligence Penalty I/B:
The full Document 6209 entry, as printed
Debit (NPJ) I/B Negligence Penalty I/B: 11, 12, 21, 22 All: 47, 54 Assesses all types of negligence penalties. This penalty should only be used for returns due before 1/1/1990.
After code 350
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Questions people ask
What does code 350 mean on my IRS transcript?
Document 6209 calls it "Negligence Penalty I/B:".
Sources
Checked against these sources on October 30, 2026.