Code 429: request aims update from mf.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Used on individual (IMF) accounts.
Request AIMS Update from MF
The full Document 6209 entry, as printed
I/B Request AIMS Update from MF 77 Request that an update record reflecting current MF information be sent to the AIMS data base. Does not post to MF. Also used to release tax shelter freeze (-E).
After code 429
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Questions people ask
What does code 429 mean on my IRS transcript?
Document 6209 calls it "Request AIMS Update from MF".
Sources
Checked against these sources on October 30, 2026.