I came to the US on H-1 as a psotdoc last year. The payroll office of the University fit me in the system of tax treaty so I get tax exemption for three years. Last October, I have filed I-140 and I-485 concurrently. After I check the tax return form I-1040NR, the last question (Q) is whether you have applied for permanent residence. To me it is Yes. My question is can I still have the privilege of tax exemption after filing I-485? Last year I have spent a lot on this application and salary of postdoc is quite low, so if I have pay back all the tax definitely I will go bankruptcy. I have no intention not to pay tax, I just want to pay as less as possible legally. If I take this privilege of tax exemption, will it effect my I-485 application? Can I just pay back the taxes start from October when I submit I-485? From IRS website, It seems that I can still take this privilege even after filing I-485, but I am not sure. If you have the similar situation before, please give me your advice. Thanks a lot.