Deductions & credits

Line 6 is regular exemptions.  Are you claiming a Domestic Partner?   If so, the domestic partnership must be registered in New Jersey by the last day of the tax year.  You can only claim your domestic partner if they do not file a New Jersey return. You must enclose a copy of your Certificate of Domestic Partnership the
first time you claim the exemption, and thus file by mail.

2020 New Jersey Resident Return, Form NJ-1040 (state.nj.us)