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New York State - NY Tax on Foreign Sourced Income for NY Non-Resident
For Non-Resident filers, New York taxes New York-sourced income. That includes: real or tangible personal property located in New York State   (including certain gains or losses from the sale or exchange of an   interest in an entity that owns real property in New York State); services performed in New York State; a business, trade, profession, or occupation carried on in New York State; and a New York S corporation in which you are a shareholder (including   installment income from an IRC 453 transaction). There are some exclusions as well. It is all covered in the instructions to form IT-203. However, keep in mind that "filing" as non-resident doesn't make you non-resident. If you spend 184 days or more in New York State, and you have a place to stay there - you are resident. See definitions here. Even if you don't actually live there and consider yourself a CT resident.