Code 637: reversal of separate appropriations refundable credit.
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
Debit. Used on individual (IMF) accounts.
Reversal of Separate Appropriations Refundable Credit
The full Document 6209 entry, as printed
Debit (NPJ) I/B Reversal of Separate Appropriations Refundable Credit Generated Transaction Reversal of TC 636. Identification number 03 indicates reversal of credit for solar or wind energy investment.
After code 637
Not enough shared timelines with this code yet. The block fills in once 30 people with code 637 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 637 mean on my IRS transcript?
Document 6209 calls it "Reversal of Separate Appropriations Refundable Credit".
Sources
Checked against these sources on October 30, 2026.