Code 660: estimated tax payment.
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 Payment
The full Document 6209 entry, as printed
Credit (PJ) I/B Estimated Tax Payment 17, 24, 34, 58 Credits tax module for amount of Estimated Tax paid. Credit is frozen from refunding or offsetting until a TC 590/591(BMF only) or a TC 150 posts. Applicable to Forms 990C, 990T, 990PF, 1040, 1041, 1041ES, and 1120 only. IMF: See UPC 198 and UPC 305. 660 Credit (PJ) B Federal Tax Deposit 19, 97 The transaction code that identifies the credit on the tax module as an FTD payment. Applicable MFTs that can be used with this TC are 02, 05, 33, 34 and 44.
After code 660
Not enough shared timelines with this code yet. The block fills in once 30 people with code 660 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 660 mean on my IRS transcript?
Document 6209 calls it "Estimated Tax Payment".
Sources
Checked against these sources on October 30, 2026.