Yes, it should. I worked up a mock return to walk through the steps of how to get the right input into TurboTax. The percentage method is the only way to get the right income into the system. There's no direct entry method. And you do have to work up the IT-203-F form manually. (I attached a link that can produce a downloadable and fillable PDF which you can attach). TurboTax cannot otherwise assist with how to fill out that form. The general idea, though, is to determine how much of the vested RSU is New York income. For instance, let's say the RSU option's value was $5000. Now, if the option was granted on July 1, 2019 and vested on July 1, 2020, but your physical work location (not via telecommuting, but your actual office location) moved to New Jersey on January 1, 2020, then 50% of the RSU is New York income, and 50% is New Jersey income. However, it is all reported as taxable wages (even if you didn't cash them out) as of July 1, 2020, because that is when you now have access to the compensation. The IT-203-F form, filled out properly over the multi-year period of 2019 and 2020, should reflect $2500 as taxable to New York.
That is the stock portion. However, as far as your cash bonus is concerned, only cash payouts received as bonus in 2020 could count as New York income for 2020 (if the bonus was calculated off of work performed within New York State even if that work was performed in 2019), but not amounts received in 2019 (which would have been reported as taxable in 2019). If there is a split, portion A of the same IT-203-F form can assist in calculating the portion of the bonus issued that would also be considered "New York source" income. In this case, take the final result of both sides of the form, divide that by the amount of "NY Income" reported on the W2, and that is your percentage allocation. For instance, if the bonus allocation plus the RSU allocation equals $7500, and your NY income on Form W2 says that you have $100,000 of NY Income, then you divide the $7500 by $100000 to get a decimal: .0750, which is 7.5%. Enter this in the proper TurboTax box as 7.500. Save your filled-out IT-203-F as a PDF on your computer, and attach a copy to your return as prompted above. Keep everything documented for your records in case NY State asks for proof of your method. But this is the technique on how to enter it all into TurboTax, yes.
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