INSTRUCTIONS: AMENDED CONNECTICUT INCOME TAX RETURN FOR INDIVIDUALS (Form CT-1040X)
Connecticut full-year and part-year residents and non-residents use a form CT-1040X to amend an initially filed state income tax return. This document is obtained from the website of the government of the state of Connecticut.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 1: If you filed on a fiscal rather than calendar year basis, enter its beginning and ending dates at the top of the form.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 2: Enter your name and Social Security number. Provide the same information for your spouse if filing jointly.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 3: Give your mailing address. If your city, town and zip code of residence is different, enter it below. Provide your telephone number as well.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 4: Indicate your filing status on both your original return and this amended return with check marks. Check the box where indicated if you are filing this amended return as the result of federal adjustments or adjustments made by another state. Check the applicable boxes if filing a form CT-1040CRC or CT-8379.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 5: Lines 1 through 23 require you to complete 3 columns. In column A, enter the originally reported or last adjusted amount. In column B, enter the net increase or decrease between the original and corrected figures. In column C, enter the corrected figures. Enter your federal adjusted gross income on line 1.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 6: If you have any additions, complete lines 31 through 39 in Schedule 1 on the second page. Transfer the value from line 39 to line 2 on the front page. Add lines 1 and 2 and enter the sum on line 3. If you have any subtractions, complete lines 40 through 50 in Schedule 1. Transfer the value from line 40 to line 4 on the first page. Subtract line 4 from line 3 and enter the difference on line 5.
Amended Connecticut Income Tax Return For Individuals CT-1040X Step 7: Only nonresidents and part-year residents should complete lines 6 through 9. All filers must compute their tax liability on lines 10 through 30 and explain their reasons for filing an amended return on the second page.
