FAQ on filing a part-year state return:
If you were a resident of two different states during the tax year (for example, if you moved from one state to another), you'll normally file part-year returns in both states, assuming each state collects income tax and you had income in each state.
TurboTax handles part-year returns, but you need to make sure you've set up your personal information correctly for us to do so. We'll ask about where you lived in 2018 when you set up your personal information.
If you need to add this information after you've begun your return:
After you finish your federal return, you'll automatically move to State Taxes, where you'll see your part-year states listed. We suggest you prepare the return for your former state, followed by the return for the state you currently live in.
Important: If you also see a nonresident state return on the State Taxes tab, complete that return before you work on your part-year return(s) to ensure your tax credits are calculated correctly.
Thank you. But we have already filed a 2018 federal return as MFJ. I just need to fill out a partial year state return for her W-2 income received while she was in NJ. How do I go about doing that?
Assuming you filed using TurboTax Online, you can log back into your account, and on the left side of the screen (in the left navigation bar) you will be able to scroll down until you see the menu item that calls out Federal Return. There should be a option to add a state return. Click here to proceed.