Tax adjustments

IRS code 300: Additional tax assessed by examination

An examination or appeals decision added tax to this year.

What code 300 means

Code 300 assesses additional tax from an examination (audit) or appeals adjustment on a year whose return has posted.

When it posts with certain closing codes, it also generates a 421 that closes the examination indicator. Interest may follow, as code 196.

Codes often seen with 300

• 301 Tax reduced by examination An examination or appeals decision reduced the tax on this year.
• 420 Examination of tax return Your return was referred to the IRS's examination or appeals function.
• 421 Examination indicator closed The examination indicator (420 or 424) was reversed.
• 196 Interest charged Interest the IRS charged on tax that wasn't paid on time.

Source

IRS title: Additional Tax Assessment by Examination or Appeals (Document 6209, Section 8A, page 8A-13).

• IRS Document 6209 (2023), Section 8A: Master File Codes
• Taxpayer Advocate Service: Decoding IRS Transcripts, Part II

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More tax adjustments codes

• 290 Additional tax assessed
• 291 Prior tax reduced or removed
• 301 Tax reduced by examination

See all 39 transcript codes

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