Connecticut Quarterly Tax Calculator
Calculate your estimated quarterly tax payments for federal and Connecticut state taxes. Designed for self-employed individuals, freelancers, and independent contractors.
CT State Tax: Progressive 2.0% - 7.0%
Quarterly Payment Amount
$6,428
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,428
Apr 1 - May 31
Due: June 15, 2026
$6,428
Jun 1 - Aug 31
Due: September 15, 2026
$6,428
Sep 1 - Dec 31
Due: January 15, 2027
$6,428
Don't miss your quarterly payments!
The IRS may charge penalties and interest if you underpay or pay late. Consider setting up automatic payments or calendar reminders.
Connecticut Quarterly Tax Highlights
Connecticut has 7 tax brackets with rates from 2% to 6.99%
Additional tax recapture for high earners
Use Form CT-1040ES for quarterly payments
Complex bracket system with multiple rates
Connecticut Quarterly Tax FAQ
What is Connecticut's income tax rate?
Connecticut has a progressive income tax with 7 brackets ranging from 2% to 6.99%. The top rate applies to income over $500,000 (single) or $1,000,000 (married).
Official References
This calculator uses current federal and Connecticut tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- Connecticut Department of Revenue Services
Official Connecticut tax authority
- IRS Self-Employment Tax
Social Security and Medicare tax information
This calculator provides estimates based on 2026 tax rates. Your actual tax liability may vary based on deductions, credits, and other factors. Consult a tax professional for personalized advice.