Adjusted Gross Income (AGI) Explained Step by Step
AGI sits between gross income and taxable income, and the two get confused constantly. The brackets run against taxable income; most phase-outs are written against modified AGI. This walks through the order.
Adjusted Gross Income (AGI) is your total gross income minus specific adjustments allowed by the IRS. Gross income includes wages, dividends, capital gains, business income, and other earnings. Adjustments, often referred to as "above-the-line deductions," can include contributions to retirement accounts, student loan interest, and certain business expenses.
How to Calculate Adjusted Gross Income (AGI)
To determine your AGI, follow these steps:
- Determine Your Total Gross Income: Combine all income sources, such as salaries, rental income, dividends, and business earnings.
- Identify Applicable Adjustments: Common adjustments include educator expenses, student loan interest, contributions to traditional IRAs, and health savings account contributions.
- Subtract Adjustments from Gross Income: Deduct the total adjustments from your gross income to arrive at your AGI.
Why Adjusted Gross Income (AGI) Matters for Taxpayers
AGI affects:
- Tax Brackets — the brackets apply to taxable income, not AGI. Subtract the standard or itemized deduction and any QBI deduction from AGI and you reach the figure the rates actually run against.
- Credits and Deductions – Most phase-outs are written against modified AGI, which starts at AGI and adds certain items back. The Child Tax Credit is one of them. The add-backs differ from rule to rule, so one taxpayer can have several MAGI figures in the same year.
- Investment Taxes – Long-term capital gains rates run against taxable income, on the same figure as the ordinary brackets. What AGI drives is the 3.8% net investment income tax, which applies above $200,000 of modified AGI for a single filer and $250,000 on a joint return (§1411).
Adjusted Gross Income (AGI) and Tax Deductions
Your AGI determines whether you should take the standard deduction or itemize expenses. The 2026 standard deduction is:
- Single filers or Married filing separately: $16,100
- Married filing jointly or Qualifying Surviving Spouse: $32,200
- Heads of household: $24,150
Adjusted Gross Income (AGI) for Business Owners and Investors
Real Estate Investments
Real estate investors report rental income as part of their gross income. However, they can lower their AGI through deductions like mortgage interest, property taxes, operating expenses, and depreciation. The IRS allows residential rental property depreciation over 27.5 years, significantly reducing taxable income (IRS, 2025).
For strategies on maximizing tax benefits in real estate, see our tax solutions page.
Private Equity Funds
Partners in private equity funds must report their share of income and expenses. AGI is impacted by deductions such as management fees and fund-related expenses. Carried interest arrives as capital gain and enters AGI like any other capital gain. What changes is the holding period: under §1061 an applicable partnership interest needs three years rather than one for long-term treatment, and a shorter hold is recharacterized as short-term.
Technology Companies (SaaS)
SaaS businesses include subscription revenue in gross income but can lower AGI by deducting R&D costs, salaries, and marketing expenses. The five-year amortization that applied from 2022 through 2024 is gone: OBBBA added §174A, and domestic research is deductible in the year it is paid or incurred for tax years beginning after December 31, 2024. Research attributable to foreign work stays on a 15-year amortization (Rev. Proc. 2025-28). A company can still elect to amortize the domestic side under §174A(c), but the default is now the immediate deduction.
Our financial forecasting work covers how these deductions land in a SaaS model.
Hospitality & Short-Term Rentals
Hotel operators and Airbnb hosts must report rental income but can deduct operating costs, employee wages, property taxes, and depreciation to reduce AGI. IRS guidelines allow property depreciation over its useful life, easing tax burdens (IRS, 2025).
Ways to Lower Adjusted Gross Income (AGI)
- Max Out Retirement Contributions – traditional 401(k) and deductible IRA contributions come off before AGI, so they move the figure the phase-outs are measured against.
- Invest in a Health Savings Account (HSA) – HSA contributions are tax-deductible.
- Claim Business Deductions – Self-employed professionals can write off expenses like office space and travel.
- Use Tax-Loss Harvesting – realized losses offset realized gains, and up to $3,000 of net loss a year comes off ordinary income, both above the AGI line.
Parikh Financial: Expert Guidance for Lowering Your AGI
At Parikh Financial, we specialize in tax planning for real estate investors, SaaS founders, private equity funds, and cryptocurrency traders.
Ready to optimize your taxes? Book an Introduction Call with our team today.
Note: Tax laws change frequently. Always refer to the Parikh Financial Blog for the latest updates.
Frequently asked
Questions, answered
What is the difference between AGI and modified adjusted gross income (MAGI)?
AGI is your gross income minus above-the-line adjustments. MAGI starts from AGI and adds back certain items, such as student loan interest, foreign earned income, and some tax-exempt interest. The exact add-backs vary by the rule being applied. MAGI, not AGI, often determines eligibility for Roth IRA contributions, the premium tax credit, and IRA deduction phase-outs, so the same taxpayer can have several different MAGI figures.
Where do I find my AGI on my tax return, and why does it matter for e-filing?
Your AGI appears on Form 1040, on the line labeled adjusted gross income near the bottom of the income section. When you e-file, the IRS may ask for your prior-year AGI to verify your identity in place of a signature. If you enter the wrong figure, your return can be rejected. Pull the exact number from last year's filed 1040 or your IRS online account transcript rather than estimating it.
Does lowering my AGI always reduce my taxes?
Not always, but a lower AGI usually helps. AGI is a gate for many tax benefits: it can affect how much of your medical expenses or other deductions you can claim, which credits you qualify for, and income-based phase-outs. Reducing AGI through retirement contributions or eligible business expenses can unlock benefits you would otherwise lose. The actual tax saved depends on your bracket, filing status, and which thresholds you cross, so model it before assuming a dollar-for-dollar benefit.