Connecticut Income Tax Returns, Forms and Calculators Connecticut Income Tax Returns on eFile.com: eFileIT Now Prepare and e-File Your Connecticut State Income Tax Return With Your Federal Tax Return. Find Connecticut Tax Return Forms. How to File an Connecticut Income Tax Return Tax Extension How and When To Prepare and File an Connecticut Tax Extension. Should You File an Connecticut Tax Return or Extension. Deadlines. Connecticut Income Tax Payment Options. Online by Check. How To Pay Connecticut Income Taxes Online or via Check. Options to Pay Income Taxes. Mailing Addresses for CT Returns. Tax Day and Deadlines For Connecticut Income Taxes Connecticut State Income Deadlines. The Tax Day Is Almost Always The Same Date as the IRS Deadline. Extension Deadline and Amendment Information. Your Connecticut Tax Refund Status? Where Your Money Is. After Your Filed Your Connecticut Taxes You Can Check Your Tax Refund Status Here. Connecticut Will Post This Once Your Return Got Accepted Connecticut Income Tax Forms By Tax Year. e-File Your Taxes. Income Tax Forms For Connecticut. Forms That You Can e-File and Forms you Can Fill Out here on eFile.com. Prepare Now. Connecticut Tax Rates, Standard Deductions, and Forms Find Connecticut or CT Income Tax Rates By Which Your Income is Calculated. Also, find Standard Deductions, and CT Tax Forms by Tax Year. How To Prepare And File An Amended Connecticut Tax Return Learn How To Prepare and File An Amended Connecticut Tax Return. Find Amendment Form CT 1040X To Correct Your CT Tax Returns For Various Tax Years. Calculate, Estimate Your Connecticut Income Taxes by Tax Year The Connecticut Tax Calculator Lets You Calculate Your State Taxes For the Tax Year. The Federal or IRS Taxes Are Listed. Connecticut Income Tax Return Instructions for eFile.com Connecticut Income Tax Return Instructions and How To Prepare on eFile.com. Residency Status, Forms and CT Community State. TurboTax® is a registered trademark of Intuit, Inc. H&R Block® is a registered trademark of HRB Innovations, Inc.