Code 308: additional tax assessment by examination or appeals 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 by Examination or Appeals with Interest Computation Date
The full Document 6209 entry, as printed
Debit (NPJ) I/B Additional Tax Assessment by Examination or Appeals with Interest Computation Date 47 Inputs an Examination Deficiency 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 trans - action. BMF-Can be used with another tax adjustment code, except TC 304, 305 or 309. Can be used with penalty and interest transactions. Otherwise same as TC 300. IMF-Cannot be used with other tax transaction codes, but may be used with interest and penalty codes. 308 Debit B Additional Tax or Deficiency Assessment by Examination or Collection with Interest Computation Date 47 Input on Examination Deficiency on Employment tax module in which interest is restricted due to IRC Section 6205.
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What does code 308 mean on my IRS transcript?
Document 6209 calls it "Additional Tax Assessment by Examination or Appeals with Interest Computation Date".
Sources
Checked against these sources on October 30, 2026.