Filing Connecticut Income Taxes

Connecticut State Map

Since 2011, the Connecticut income tax rate has varied between 3 and 6.5%. Presently, the annual tax revenue for the state is over $15 billion, which is close to the median range in America. Residents, nonresidents and partial-year residents of Connecticut, who earn money within the state must file an annual income tax return. Residents should use the form CT 1040, nonresidents and partial-year residents should use the form CT 1040NR/PY.

Connecticut taxes are due April 15th. Any outstanding amount after this date is subject to a 10% penalty along with an additional 1% fee each month for as long as the amount remains unpaid. If the 10% fee is less than $50, the fee is adjusted to the minimum fee amount of $50.

Asking for an Extension

Requesting an extension of time to file (form CT 1040EXT) can be sent to this address, depending upon whether a Connecticut tax refund is expected or tax payment is due: 

Residents mailing forms with payments should send them to:

PO BOX 2977

Hartford CT 06104-2977

Estimated Payments and Amendments

If estimated payments are necessary, they can be paid online at drsindtax.ct.gov/AUT/welcomeindividual.aspx, or by mail to the DRS. When paying by mail, send vouchers and payments to:

PO Box 2932

Hartford CT 06104-2932

If an error is discovered and an amendment is needed, taxpayers may use the form CT 1040X and mail it to:

PO Box 2978

Hartford, CT 06104-2978

For questions on amended returns or its status, you may call 860-297-5962

How Do I Track My Refund?

To track your Connecticut refund, you may visit www.ct.gov/drs/site/default.asp. On the left side of the menu, mouse over "How Do I" and click the option to check the status of a refund.

Note: States & U.S. territories may make changes to their tax laws with little notice. We do our best to keep this information up-to-date, but it is provided on an "AS IS" basis. For more see our terms.

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