Formula for Calculating Adjusted Gross Income

The amount of money you made last year does not automatically equal your taxable income. When filing your taxes, you must first deduct certain expenses called itemized deductions from your gross income in order to determine your taxable income, otherwise known as adjusted gross income or AGI.

If you fall within the 22-percent tax bracket, for example, you do not pay 22 percent of your gross income, but rather 22 percent of your adjusted gross income. Everyone has an adjusted gross income thanks to the standard deduction, even without any qualifying itemized deductions. In order to calculate your AGI, you will subtract all eligible deductions from your gross income.

TL;DR (Too Long; Didn't Read)

Your Adjusted Gross Income, or AGI, represents your total yearly income minus any deductions you choose to take.

Exploring Itemized Deductions

Itemized deductions represent the "adjustments" made to your gross income. Form 1040 Schedule A helps you list the most common itemized deductions: unreimbursed medical and dental expenses, taxes paid, interest paid on your mortgage, gifts made to charity, casualty and theft losses, unreimbursed job expenses, tax preparation fees and investment or safe deposit box fees.

Assessing Standard Deductions

The total itemized deductions must reach a minimum threshold in order to be worthwhile. If your itemized deductions fall below this amount, you can take a standard deduction.

Standard deductions depend on your filing status: for individuals, the standard deduction is $12,000; for the head of the household, it is $18,000; and for married couples, it is $24,000.

For example, if you file as an individual and your itemized deductions fall below $12,000, you can take the standard deduction. However, if your itemized deductions exceed $12,000, you can bypass the standard deduction and claim all of those itemized deductions for a lower adjusted gross income.

Things You Cannot Deduct

Itemized deductions are quite specific. You may notice a line on Form 1040 Schedule A marked "Miscellaneous Deductions," but this space is still reserved for specific expenses such as gambling losses. Always check the instructions corresponding to Form 1040 Schedule A to verify that you are filling it out correctly.

Expenses relating to your personal life do not meet the requirements for itemized deductions. This may include hobbies, home improvement, spas, car repair, licenses, groceries, parking tickets and more.

The Formula for Calculating Adjusted Gross Income

If you know that your itemized deductions fall below the standard deduction, calculating your adjusted gross income is straightforward: simply subtract the standard deduction from your gross income. Otherwise, you will need to add up all of your itemized deductions and then subtract that total from your gross income.

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