New York has an interesting way of calculating non-resident and part-year resident tax. They take your entire federal Adjusted Gross Income (AGI) and then determines what the New York tax would be on all of it. They then apply the percentage of New York to total income to that calculate amount to determine what your actual New York tax owed is. So, if your federal AGI would put you in a high NY tax bracket, and you have a small amount of New York income, that small amount gets taxed at the high tax bracket rate.
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