Has anybody else noticed that the CT income tax formula is wrong? It is adding box 16 and box 17 of the W-2 and then calculating the income tax.

[claudinend]

To be clear, it is TurboTax that has the formula wrong. They are adding our state tax withholdings to the Federal AGI amount before calculating the tax. Basically taxing us on our withholdings, when they weren't deducted in the first place.

[DianeW777]

If you would like to send us a “diagnostic” file that has your “numbers” but not your personal information it would help.  If you would like to do this, here are the instructions:  (Don't forget to give us the state)

TurboTax Online:

Open your return -Go to the menu panel on the left side of your return and select Tax Tools. 

1. Then select Tools below Tax Tools.
2. A window will pop up which says Tools Center.  
3. On this screen, select Share my file with Agent.
4. You will see a message explaining what the diagnostic copy is.  Click okay through this screen and then you will get a Token number.
5. Reply to this thread with your Token number and your state. This will allow us to open a copy of your return without seeing any personal information.

TurboTax Desktop:

If you like, you can send a copy of your return that will be scrubbed to eliminate your personal data by using these steps:

1. Click on Online in the top left menu of TurboTax Desktop for Windows
2. Select 'Send Tax File to Agent'* > Follow the prompts to reach the token number.
   • Enter your email used for TurboTax > Enter your code > Send
3. Write down or send an image of your token number and state then place in this issue.
4. We can then review your exact scenario for a solution.
5. Please also tell us any states included in the return. This is necessary for us to view the return.
   • *If using a MAC, go to the menu at the top of the screen, select Help, then, 'Send Tax File to Agent')

We will be able to see exactly what you are seeing and we can determine what exactly is going on in your return to provide you with a resolution.

[claudinend]

My Token number is 1361287. The state is CT. Thank you!

[DianeW777]

Thank you for providing a token. When reviewing your tax return the AGI carried to the Connecticut (CT) return is the same as the federal AGI. That figure is used to calculate the tax on the Tax Calculation Schedule (CT1040TCS) and the tax is accurate. There is an increase to the state tax liability from Table C and Table B (see the link below).

• CT Tax Calculation Schedules and Tables

This provides a refund on the CT tax return after applying your CT withholding from your W-2. 

From the left rail menu in TurboTax Online, select Tax Tools (You may have to scroll down on the left rail menu.)

1. Select Tax Tools
2. On the drop-down select Tools
3. On the pop-up menu titled “Tools Center”, select View Tax Summary 
4. On the left sidebar, select Preview my 1040 and Preview my CT

For TurboTax Desktop, change to 'Forms' and review the forms 

You have access to all forms when you choose to print your return in TurboTax Online/Mobile.  However you are required to pay before printing, but do not have to file until you are ready.

• Can I print a copy of my return in TurboTax Online before filing?

If you are using TurboTax Desktop you can switch to Forms and review all forms and worksheets.

@claudinend

[Edited: 04/16/2026 | 8:53 AM PST]