IRS上面是这么说的:Adjusted Gross Income is defined as gross income minus adjustments to income. We suggest you refer to your 2011 federal income tax return to get a quick estimate of your 2012 AGI. On your 2011 return, please refer to:
AGI includes all your income minus certain deductions. You use your AGI to find out if you qualify for EITC and for finding the amount of EITC you receive