You file in both states. NY can tax the income you earn from work performed in NY. Your resident state of KS can tax all your income, regardless of where earned.
You'll be able to claim a credit on your KS return for the taxes paid to NY, so you won't be double-taxed.
In TurboTax, be sure to complete your non-resident NY return before you do your home state KS return, so that the program can correctly calculate and apply the credit.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
