Welcome to "why I stopped doing NY tax returns."

NY has a ridiculous form IT-203-B that you have to fill out to allocate the wages based on the number of days spent in-state.  'Cause everybody keeps track of that.

It gets even more fun if there's a bonus or employer stock grant that was partially earned while working in NY.  That gets you an IT-203-F (which wasn't supported by ProSeries when I left).  Because everybody knows exactly how many days in the last four years they worked in and out of NY.