How to determine income taxed by both NY and NJ

The income you should use comes from Line 29, Form NJ-1040 and should agree with your NY AGI, Line 31, Column B. The amount you enter as double-taxed income should appear under the New York column on the screen Tell us about the money you earned in New York. You should only enter this amount if different. 

New York State uses the New York Income Factor when determining your tax amount. Their state return starts with all your taxable income and taxes it at the applicable New York State rate based on your total income. However, your NY taxable income should not be greater than your NY AGI, 

Example:

I would like to take a deeper look at this. However, I need a diagnostic file which is a copy of your tax return that has all of your personal information removed. You can send one to us by following the directions below:

TurboTax Online:

1. Sign into your online account.
2. Locate the Tax Tools on the left-hand side of the screen.
3. A drop-down will appear. Select Tools
4. On the pop-up screen, click on “Share my file with agent.”
5. This will generate a message that a diagnostic file gets sanitized and transmitted to us.
6. Please provide the Token Number that was generated in the response.

TurboTax Desktop/Download Versions:

1. Open your return.
2. Click the Online tab in the black bar across the top of TurboTax and select “Send Tax File to Agent” *
3. This will generate a message that a diagnostic copy will be created.  Click on OK and the tax file will be sanitized and transmitted to us.
4. Please provide the Token Number (including the dash) that was generated in the response.

*(If using a MAC, go to the menu at the top of the screen, select Help, then, “Send Tax File to Agent”)