This might see like a stupid question, but say that I earned 6000 dollars this last year, if after standard deductions, my AGI is 1,000 dollars (5000 for single status), and I deduct my tuition and interest paid on student loans, minus my work study amount and grants and allowences, this gives me 1500 dollars more of a deduction. At this point my AGI is -500 dollars. Does this automatically step up to 0, or do I get a return of what I paid in taxes plus an extra 500 dollars?
*all numbers are made up to reflect a possible scenario, I have not set down to figure up any of my taxes yet.