Hi, I'm on F1/OPT working for a company right after graduation. I've been in the states since 2013 Jan - present. Instead of 1040NR, I've been filing with 1040 which includes FICA taxes being withheld by my company from 2017, 2018 and, 2019. Can I submit a 843 abatement form for those years? I did the presence test on January 2, 2020 and the result came out as non resident alien.
