New York tax law Section 631(g) states that RSU compensation is taxable by NY if you performed services for the employer in New York State during the "allocation period."
Here's a link to that law. See section C(3)(iii) for NY's definition of "allocation period" for RSU's:
https://govt.westlaw.com/nycrr/Document/I50e8350dcd1711dda432a117e6e0f345?transitionType=Default&con...
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
