@nynyfiler --
It appears that you have a situation of dual residency. You're a statutory resident of DC and a domiciliary resident of NY. In this circumstance you must file as a resident in each of the two states, and each can tax all your income. You can claim an "other state credit" on your NY return for the tax paid to DC, so you won't be double-taxed. (DC does not allow statutory residents to claim an other-state credit. In cases of dual residency, NY will allow a credit if the other state will not, which is your situation.)
https://www.tax.ny.gov/pit/credits/resident_credit.htm
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
