New York will use your total annual income to determine your tax rate, and then will apply that tax rate to your New York income only. People sometimes think NY is taxing all their income, when in fact it isn't.
This TurboTax FAQ has guidance on filing part-year resident returns, including allocating income: https://ttlc.intuit.com/questions/1901227-how-do-i-file-a-part-year-state-return
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
