2026 Form CT-1040ES
Estimated Connecticut Income Tax Payment Coupon for Individuals
Download or Print 2026 Connecticut Form CT-1040ES
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About Connecticut Form CT-1040ES
Connecticut Form CT-1040ES is used by individuals to make estimated Connecticut income tax payments for the 2026 taxable year. The coupon may apply to residents, part-year residents, and nonresidents who expect to owe Connecticut income tax that is not fully covered by withholding, pass-through entity tax credits, or other payments.
For the 2026 taxable year, estimated Connecticut income tax payments are generally due in four installments:
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027
If a due date falls on a Saturday, Sunday, or legal holiday, the payment is generally considered timely if filed on the next business day.
The 2026 Form CT-1040ES PDF includes payment coupons, coupon instructions, the Estimated Connecticut Income Tax Worksheet, tax calculation tables, and payment options. Each Form CT-1040ES coupon is year specific, so use the coupon for the tax year you are paying.
You may make estimated Connecticut income tax payments electronically through myconneCT, or download, print, and mail a completed coupon with your payment. If mailing a payment, follow the instructions printed on the coupon and do not staple the payment to the form.
Connecticut Form CT-1040ES PDF Files by Year
Click any of the Connecticut Form CT-1040ES PDF links above to download, save, view, and print the file for the corresponding year. These free PDF files are unaltered and are sourced directly from the publisher.
Use the current-year Form CT-1040ES for current Connecticut estimated income tax payments. Prior-year CT-1040ES PDFs are provided for historical comparison and recordkeeping only. Do not use a prior-year coupon to make a current estimated tax payment.
Related Connecticut Estimated Tax and Payment Forms
Need more state income tax forms? View the full Connecticut income tax forms list.
| Form Code | Form Name |
|---|---|
| Form CT-1040 | Connecticut Resident Income Tax Return (includes Schedules 1 through 5) |
| Form CT-1040NR/PY | Connecticut Nonresident and Part-Year Resident Income Tax Return (includes Schedules 1 through 4) |
| Form CT-1040V | Connecticut Electronic Filing Payment Voucher |
| Form CT-1127 | Application for Extension of Time for Payment of Income Tax |
Frequently Asked Questions (FAQ)
Here are answers to common questions about downloading, printing, completing, and mailing 2026 Connecticut Form CT-1040ES.
When are 2026 Connecticut Form CT-1040ES payments due?
Estimated Connecticut income tax payments for the 2026 taxable year are due on or before April 15, June 15, September 15, 2026, and January 15, 2027. Fiscal year filers should follow the federal estimated tax payment schedule.
What is Connecticut Form CT-1040ES used for?
Use Form CT-1040ES to make estimated Connecticut income tax payments during the year. The PDF includes payment coupons and a worksheet to help calculate the required annual payment before dividing it into installments.
Who should use Form CT-1040ES?
Use Form CT-1040ES if you are required to make estimated Connecticut income tax payments for the 2026 taxable year. The form instructions generally point to estimated payments when your Connecticut income tax, after withholding and allowed pass-through entity tax credits, is $1,000 or more and your withholding is expected to be less than your required annual payment.
Can I pay Form CT-1040ES online?
Yes. The Form CT-1040ES instructions say estimated payments can be made electronically through myconneCT. The printable coupon is useful when you choose to mail a paper payment instead.
How much should I pay with Form CT-1040ES?
Use the 2026 Estimated Connecticut Income Tax Worksheet included in the Form CT-1040ES PDF to calculate your required annual payment. The coupon instructions also explain how to subtract any available overpayment from the prior tax year when determining an installment amount.
Can I use an old Form CT-1040ES coupon?
No. Form CT-1040ES is year specific. Use the coupon for the taxable year you are paying so Connecticut DRS can apply the estimated payment correctly.
Last updated: August 1, 2026
References:
- Form CT-1040ES 2026 Estimated Connecticut Income Tax Payment Coupon for Individuals. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.
- Individual Income Tax Forms. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.
- Connecticut Resident Income Tax Payment Options. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.