I lived in NJ for 9 months in 2020 and worked in NYC. I reported the change to my employer and they did have my NY tax withheld for those 9 months I had lived in NJ.
I filed my NY Resident Income Tax Return for the 3 months I lived in NYC at the beginning before moving to NJ, but unfortunately did not file the NY Nonresident Tax Return for the months in NJ, which I believe would have allowed me to apply for a credit when filing for the NJ Tax resident return. I received a letter from IRS stating I owe a good amount of taxes to NJ, which I'm under the impression is due to the missing NY nonresident form. Is it possible or too late to make a tax amendment and file my NY nonresident tax return? Would I have to amend my NJ Tax resident turn as well?
