Adjusted Gross Income (AGI) Calculator is used to estimate AGI using common income & deductions. There are restrictions on specific AGI deductions while using gross income calculator. How to Calculate AGI – Adjusted Gross Income Using W-2? If you are an employee having a particular job or multiple jobs as a source of income then you can calculate AGI – Adjusted Gross Income using W-2 form. Adjusted gross income (AGI), or your income minus deductions, is important when calculating your total tax liability. It not only determines your tax bracket. Deductions for AGI | Deductions From AGI | Tax Cuts and Jobs Act | Income Tax course | CPA exam REG - Duration: 22:53. Farhat's Accounting Lectures 10,470 views Your modified adjusted gross income (MAGI) determines your eligibility for important tax benefits, including whether you can deduct contributions to an individual retirement account (IRA) or contribute directly to a Roth IRA.Eligibility for education tax benefits and certain income tax credits are also based on MAGI. Adjusted Gross Income (AGI) Your adjusted gross income is used for many purposes on your tax return, such as helping determine your eligibility to take certain deductions. Example of how to calculate AGI Figuring out one’s AGI is somewhat straightforward, but changing IRS rules sometimes makes it confusing. Here’s an example of how it could work for a single person with a total income of $120,000 and the following qualifying above-the-line deductions: Modified adjusted gross income (MAGI) is an important number. First of all, it determines whether you can contribute to a Roth IRA and if you can deduct IRA contributions. It also. How To Calculate AGI For Tax Purposes. Gather Your Income Statements. The first step in computing your AGI is to determine your income for the year. Income can be in the form of money.