Code 421: reverse examination indicator.
The exam indicator was reversed or the exam closed.
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Document 6209 says
Used on individual (IMF) accounts.
Reverse Examination Indicator
The full Document 6209 entry, as printed
I/B E Reverse Examination Indicator 47, 77 or Generated Transaction Generated at MCC when TC 300 posts with a Disposal Code of 1-5, 8-10, 12, or 34 to module and an unreversed TC 420, or 424 is present. Can be input directly with Doc. 47 or on Form 3177. Reverses TC 420 or 424.
After code 421
Not enough shared timelines with this code yet. The block fills in once 30 people with code 421 share theirs from the result page.
Crowd figures, not IRS data. They describe what happened to others, not a promise.
Questions people ask
What does code 421 mean on my IRS transcript?
Document 6209 calls it "Reverse Examination Indicator". The exam indicator was reversed or the exam closed. If there is a credit balance, a refund can follow.
Sources
Checked against these sources on October 30, 2026.