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Connecticut Estimated Tax Payments - Official Portal

Official Connecticut estimated tax payment portal administered by Connecticut Department of Revenue Services.

Source: Connecticut Department of Revenue ServiceswebpageApplies to: 2026
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Connecticut Estimated Quarterly Tax

Connecticut requires estimated quarterly tax payments if you expect to owe more than $1,000 in state tax. The safe harbor is paying 90% of your current year tax liability or 100% of your prior year tax. Payments are due on the same dates as federal (April 15, June 15, September 15, January 15).

Last reviewed: 2027-07-01 • State: CT