Code 666: estimated tax credit transfer in.
From IRS Document 6209, the IRS's processing codes manual.
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Document 6209 says
Credit. Used on individual (IMF) accounts.
Estimated Tax Credit Transfer In
The full Document 6209 entry, as printed
Credit (NPJ) I Estimated Tax Credit Transfer In Generated Transaction When taxpayer claims more ES credits than are posted in tax module, settlement is frozen and a TC 667 is generated and resequenced to search the spouse’s tax module. TC 666 represents the amount of ES credits transferred-in from the spouse’s module (may be zero if none available or spouse’s account is not found) and freeze is released. Also, credits to a deceased taxpayer’s spouse’s account. (Julian 999) Initialized when a CCC “F” return posts requesting credit elect.
After code 666
Not enough shared timelines with this code yet. The block fills in once 30 people with code 666 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 666 mean on my IRS transcript?
Document 6209 calls it "Estimated Tax Credit Transfer In".
Sources
Checked against these sources on October 30, 2026.