What colleges are applying to? You “think” your green card will get here sometime soonish…but what you really need to do is check the DEADLINES for applying for financial aid to the colleges to which you are applying. You may find that those deadlines are sooner than you think.
At this point, you would be applying for need based aid as an international student. So…see what your colleges require for THAT kind of application at this point…and get it done.
As noted…you will use income and taxes paid for 2015. you will need to list the income they had in 2015.
If they earned that income here and we’re required to file a tax return, that’s another issue. They will need to get that done…especially if you DO end up getting that green card. You won’t be able to get federally funded aid here if your parents were required to file a 2015 tax return…and didn’t.
ETA…if your family received money from others…that will also need to be included your financial aid application forms.