The most important number on your Tax Return is adjusted gross income which you can find on the 11th line of the 1040 form. What is the most important number on your Tax Return? AGI is reported on your federal income tax return, specifically on line 11 of Form 1040.

The resulting amount is your AGI, which is used to determine eligibility for certain tax credits and deductions, as well as the tax bracket in which you fall. You then subtract certain allowable deductions, such as contributions to a traditional IRA, certain medical expenses, and student loan interest payments. To arrive at your AGI, you start with your total gross income, which includes wages, salaries, tips, interest, dividends, rental income, and other sources of income.