Code 521: reversal of 520.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Used on individual (IMF) accounts.
Reversal of 520
The full Document 6209 entry, as printed
I/B Reversal of 520 77 Records reversal of a previously posted TC 520. If TC 520 posted prior to cycle 8624, TC 550 must be input to extend the CSED. Refer to section 11.8(8) for specific CC reversal activity.
After code 521
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Questions people ask
What does code 521 mean on my IRS transcript?
Document 6209 calls it "Reversal of 520".
Sources
Checked against these sources on October 30, 2026.