1. You do need to file the New York (NY) state return because according to you the unemployment is derived from NY state.
- New York taxes nonresidents on any income derived from New York state sources. If I am understanding your questions correctly, your unemployment was from a business within New York. If this is correct, you will need to file a Nonresident Income Tax return for New York.
2. Yes, on December 31, 2021, you were a resident of South Carolina (SC). Your part year residency began on July 29, 2021.
3. Yes, you would be a part year resident in all states where you actually resided during the year. You are not a full year resident of any state. However you were a resident of SC at the end of the year.
4. Yes, and include also NY (NJ-NM-NY) in the 'Other State Income' section.
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