Code 400: account transfer-out.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Credit. Used on individual (IMF) accounts.
Account Transfer-Out
The full Document 6209 entry, as printed
Credit (NPJ) I/B Account Transfer-Out 51 or Generated Transaction Transfer accounting control out of the Master File. Can be reversed by input of TC 370 with secondary TC 402. After posting, all subsequent transactions (except TC 370 with secondary TC 402) are unpostable. Also generated when an attempt is made to post to a tax module with maximum transactions. IMF: Can be computer generated if tax module transaction section has exceeded maximum posting size. BMF: Will generate TC 400 if tax module transaction section has an overflow condition after normal and/or special consolidation analysis has been performed. Identified by blocking series 999. Generates CP296.
After code 400
Not enough shared timelines with this code yet. The block fills in once 30 people with code 400 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 400 mean on my IRS transcript?
Document 6209 calls it "Account Transfer-Out".
Sources
Checked against these sources on October 30, 2026.