Connecticut state tax filing

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  • 350+ deductions and credits
  • Filing history, compare this year with last year
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$0Investments and rental income
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Connecticut tax details

The Connecticut Department of Revenue Services made few changes for the 2025 tax year.

  • Several new credits have been added to Schedule CT-IT (Income Tax Credit Summary): Employer CHET Contributions Tax Credit, University of Connecticut Inventive Program Tax Credit, and Workforce Housing Opportunity Development Tax Credit. The Insurance Reinvestment Fund Tax Credit is no longer available.
  • Any taxpayer eligible for the Connecticut Earned Income Tax Credit that has at least one qualifying child will receive an additional $250 to their CT EITC.
  • The CHET Baby Scholars Fund was replaced with the Connecticut Baby Bond Trust.
  • For pension and annuity calculations, 75% of IRA distributions are now included (previously 50%).

2025 Connecticut tax forms

These are the supported Connecticut state tax forms on FreeTaxUSA:

  • Form CT-1040
    Connecticut Resident Income Tax Return

  • Form CT-1040NR/PY
    Connecticut Nonresident and Part-Year Resident Income Tax Return

  • Schedule CT-SI
    CT Nonresident or Part-Year Resident Schedule of Income From Connecticut Sources

  • Schedule CT-1040AW
    CT Part-Year Resident Income Allocation

  • Schedule CT-1040BA
    CT Nonresident Business Apportionment

  • Form CT-1040X
    Amended Connecticut Income Tax Return for Individuals

  • Form CT-1040V
    Connecticut Electronic Filing Payment Voucher

  • Form CT-1040ES
    Estimated Connecticut Income Tax Payment Coupon for Individuals

  • Form CT-1040EXT
    Application for Extension of Time to File CT Tax Return for Individuals

  • Form CT-6251
    Connecticut Alternative Minimum Tax Return - Individuals

  • Schedule CT-1040WH
    Connecticut Income Tax Withholding

  • Schedule CT-EITC
    Connecticut Earned Income Tax Credit

  • Schedule CT-IT
    CT Income Tax Credit Summary

  • Schedule CT-PE
    Pass-Through Entity Tax Credit

  • Schedule CT-CHET
    CT CHET 529 College Savings Plan Contribution

  • Schedule CT-Dependent
    CT Resident Dependent Information

  • Form CT-2210
    CT Underpayment of Estimated Income Tax

Frequently asked questions

2025 Connecticut filing deadlines

Keep these Connecticut state deadlines in mind as you do your taxes.

  • Individual tax returns
    Due by April 15, 2026

  • Connecticut tax extension
    If you expect a refund:
    Automatic with a federal extension

    If you expect to owe CT taxes:
    Submit form CT-1040 EXT with payment.
    Due by April 15, 2026

  • Income tax payment
    Due by April 15, 2026

  • Tax returns for extension filers
    Due by October 15, 2026

2025 Connecticut refunds

Ways to receive your refund

Get your Connecticut refund in your checking or savings account, on a paper check, or put it towards next year's Connecticut taxes. First time filers of Connecticut will not be able to choose direct deposit.

Refund status for e-filed tax returns

If you filed your Connecticut tax return electronically, you can check your CT refund status 4-5 business days after the Connecticut Department of Revenue accepts your return.

Refund status for mailed tax returns

If you mailed your Connecticut tax return, you should wait 10 to 12 weeks before checking your CT refund status.

How to check your refund status

Check your CT refund status

Call the Connecticut Taxpayer Service Center at (860)-297-5962 or at (800)-382-9463 for Connecticut calls outside the Greater Hartford calling area only.

2025 Connecticut state tax payments

Connecticut has many income tax payment options. Find the option that works best for you below.

Pay with a card

Credit card payments can be made in MyConneCT.

Due by April 15, 2026

Pay by mail

Make your check payable to Commissioner of Revenue Services. Write "2025 For CT-1040" and your SSN(s) on the front of your check. Sign your check and clip it to the front of your return.

Due by April 15, 2026

Pay by mail with e-filed return

Use Form CT-1040V to mail in paper check. Do not send in a copy of your return with your payment if you filed your taxes electronically.

Due by April 15, 2026

Connecticut Department of Revenue contact information:

Phone: (860)-297-5962

Phone: (800)-382-9463 (Connecticut calls outside the Greater Hartford calling area only)

Online: Connecticut Department of Revenue Services

Email: drs@po.state.ct.us

Connecticut contact form

2025 Connecticut extension

An extension extends the time you have to file your return until October 15, 2026. If you need to pay taxes, you are required to pay the amount due by April 15, 2026.

You need to pay 90% of your taxes by April 15, 2026. If you pay late, you may be charged a 10% late penalty and interest (1% per month) on any unpaid taxes.

If you expect a refund from Connecticut:

Automatic with an accepted federal extension.

If you expect to owe Connecticut taxes:

Submit form CT-1040 EXT with payment by April 15, 2026.

If you did not request a federal extension or expect to owe additional Connecticut income tax, a Connecticut extension can be requested with form CT-1040 EXT.

Connecticut prior year taxes

Even though the deadline has passed, you can still prepare Connecticut taxes for prior years. Many people who file late tax returns have refunds waiting for them. We'll help you prepare and mail your federal and state tax returns.

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