Some more questions:
1) The website seems to say in some sections that the supplement should be submitted before 3/1, and in other sections, after 5/15. Which should it be? (The supplement can be submitted at any time provided that you know all the figures and values, i.e. loan amounts, but most people wait until they receive their financial aid award letter, which is generated just with the FAFSA and PROFILE data. Then they submit the supplement and apply for loans, but this should be done before June).
2) Fax or mail tax returns? (If <=3 pages, fax, else mail to GW Law Financial Aid, 700 20th St NW, Washington, DC 20052. Include GWid if known, otherwise LSAC # and/or last 4 of soc with your and your parents' tax returns).