Code 336: interest assessment on additional tax or defi - ciency.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Debit. Used on individual (IMF) accounts.
Interest Assessment on Additional Tax or Defi - ciency
The full Document 6209 entry, as printed
Debit (NPJ) I/B Interest Assessment on Additional Tax or Defi - ciency Generated Transaction Assess computer-generated interest on additional tax or deficiency assessed upon posting of an Examination Adjustment (TC 300 with Doc. Code 47) and issuance of the adjustment notice.
After code 336
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Questions people ask
What does code 336 mean on my IRS transcript?
Document 6209 calls it "Interest Assessment on Additional Tax or Defi - ciency".
Sources
Checked against these sources on October 30, 2026.