Code 606: underpayment cleared (under $5).
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
Credit. Used on individual (IMF) accounts.
Underpayment Cleared (Under $5)
The full Document 6209 entry, as printed
Credit (NPJ) I/B Underpayment Cleared (Under $5) Generated Transaction Clears any debit (plus) net balance less than $5.00. For MFT 61 debit balance must be under $1.00.
After code 606
Not enough shared timelines with this code yet. The block fills in once 30 people with code 606 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 606 mean on my IRS transcript?
Document 6209 calls it "Underpayment Cleared (Under $5)".
Sources
Checked against these sources on October 30, 2026.