Code 510: releases invalid ssn freeze on refunds.
From IRS Document 6209, the IRS's processing codes manual.
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This code is rare on refund timelines. The IRS's own description is on the right.
Document 6209 says
Used on individual (IMF) accounts.
Releases Invalid SSN Freeze on Refunds
The full Document 6209 entry, as printed
I Releases Invalid SSN Freeze on Refunds 77 Releases invalid SSN freeze indefinitely, as long as SSN/Name Control remain unchanged.
After code 510
Not enough shared timelines with this code yet. The block fills in once 30 people with code 510 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 510 mean on my IRS transcript?
Document 6209 calls it "Releases Invalid SSN Freeze on Refunds".
Sources
Checked against these sources on October 30, 2026.