I worked for 4 months at an internship in Massachusetts in the summer of 2016. I'm a Canadian citizen and resident and have a few questions below. For background, I don't pass the substantial presence test for 2016
Do I just need to file Form 1040NR-EZ for federal taxes and Form 1-NR/PY for state taxes, and mail them to their respective addresses? Can I file them at the same time or do I need to wait for the result of one before filing the other?
Should I file a form 8843? Or is it irrelevant if I already don't pass the substantial presence test?
Do I have to wait until the tax return is processed before reporting the amount on line 61 of Form 1040NR-EZ on my Canadian tax return?
Are there any complications I should be aware of for sending in my tax returns late? Or can I just mail the federal/state tax forms separately tomorrow?