Code 298: additional tax assessment with interest computation date.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Debit. Used on individual (IMF) accounts.
Additional Tax Assessment with Interest Computation Date
The full Document 6209 entry, as printed
Debit (NPJ) I/B Additional Tax Assessment with Interest Computation Date 54 Used to input an additional assessment of tax to a module which contains a TC 150. Generates assessment of interest from the interest computation date which must be included in the transaction. BMF: Can be used with another tax adjustment code on the same document (record) i.e., TC 290 or 291, but is not acceptable with TC 294 or 295. Can also be used with penalty codes and interest codes. Otherwise same as TC 290. IMF: Cannot be used with other tax and interest transaction codes, but may be used with penalty codes. Otherwise same as TC 290.
After code 298
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What does code 298 mean on my IRS transcript?
Document 6209 calls it "Additional Tax Assessment with Interest Computation Date".
Sources
Checked against these sources on October 30, 2026.