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Adjusted gross income (AGI) is your gross income minus certain deductions. AGI isn’t the same as taxable income, but finding your AGI is a necessary step for determining taxable income.
Your adjusted gross income (AGI) is your gross income minus certain deductions, also known as adjustments. Your AGI isn’t the same as your taxable income, but finding your AGI is a necessary intermediate step for determining your taxable income.
Once you know your AGI, you can determine whether or not you qualify for a number of other deductions and allowances. For example, on your 2020 taxes, which are due on Tax Day 2021, it’s possible to deduct medical expenses that exceed 7.5% of your AGI. So to know how much you can deduct, you need to first calculate your AGI.
The first thing you need in order to calculate AGI is your gross income. This is all of the income you earned throughout the year. That includes earnings from your W-2 and 1099 forms, as well as other income like Social Security benefits and alimony payments.
Some income is not subject to federal income tax, so you subtract (deduct) it from your gross income. After you account for those deductions, you have your AGI.
There are more than a dozen potential deductions. One common example is for contributions you make to a health savings account (HSA). Even though the money you contributed was part of your income for the year, the federal government doesn’t collect tax on money you put into an HSA. So when you determine your AGI, you can deduct your HSA contributions.
You may also hear people refer to above-the-line deductions. These are the deductions you make from your gross income in order to get to your AGI. (Learn more about above-the-line deductions vs below-the-line deductions.)
Conversely, a below-the-line deduction is money you deduct from your AGI when you itemize deductions. Common examples are the deductions for charitable contributions, mortgage interest, and medical expenses.
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For the 2019 tax year, which you file in early 2020, these are the main deductions you can make to find your AGI:
There were additional above-the-line deductions prior to the 2018 tax year, but some were eliminated and others were changed during the tax reform in 2017. If you think you can claim a deduction that wasn’t mentioned above, make sure to double check the instructions on the latest Form 1040.
After you calculate AGI, you can take either the standard deduction or you can take the total of your itemized deductions, whichever is worth more. What’s left after you deduct that amount is your taxable income. So finding your AGI is necessary for getting your taxable income.
To determine whether or not you qualify for certain deductions, you need to use your modified adjusted gross income (MAGI) instead of your AGI. The difference is that MAGI adds back some of the deductions you’re allowed to make when calculating AGI. AGI and MAGI are the same or very similar for most people.
Deductions you can take for your AGI but not your MAGI include the following:
One of the most important uses of MAGI is to determine whether or not you can contribute to a Roth IRA.
Just like the federal government, states with an income tax determine your taxable income by first calculating some sort of AGI. Most states start with your federal AGI and then allow some state-specific adjustments. It isn’t uncommon if your state AGI is slightly lower than your federal AGI.
Derek is a tax expert at Policygenius in New York City. He has written about multiple personal finance topics in the past, and his work has been covered by Yahoo Finance, MSN, Business Insider and CNBC.
Policygenius’ editorial content is not written by an insurance agent. It’s intended for informational purposes and should not be considered legal or financial advice. Consult a professional to learn what financial products are right for you.
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