State tax filing

When completing your nonresident Rhode Island return, you can allocate only the income that you earned while working in Rhode Island. If you don't have the exact number, you can allocate based on a reasonable method - such as percentage of time working in Rhode Island or number of days.

Since Massachusetts is your resident state, all of your income is taxable to Massachusetts. You will qualify for a credit in Massachusetts for the taxes paid to Rhode Island on the same income to avoid paying tax twice.

When it comes to double counting the income, the state instructions requires adding all boxes 16 together when completing your return. This creates a problem when, as in your case, you are a resident of Massachusetts for the full year but work in another state. The income is reported on the W-2 for both states. Therefore, you'd need to do an adjustment when the wages are overstated because multiple states are reporting the same income. 

To fix this, click No on the screen that says that TurboTax transferred the full amount of wages from all boxes 16 on your W-2.

Because your wages are overstated due to the income being reported in both states, on the next screen click Yes to let TurboTax know to only transfer wages that are marked as MA wages from the W-2.

This will correct your wages on your Massachusetts return.