Adjusted Gross Income (AGI) Calculator
Calculate your Adjusted Gross Income (AGI) using IRS rules. Enter all income sources and above-the-line deductions to find your AGI for 2024 tax year.
About
Adjusted Gross Income (AGI) is the single most consequential number on your federal tax return. It determines eligibility for credits (Child Tax Credit phases out above $200,000 for single filers), deduction thresholds (medical expenses must exceed 7.5% of AGI), and Roth IRA contribution limits. An incorrect AGI can trigger IRS notices, delay refunds, or cause you to miss deductions worth thousands. This calculator applies 2024 IRS rules including self-employment tax computation at the statutory rate of 15.3% on 92.35% of net earnings, student loan interest phaseouts by filing status, and HSA contribution caps by coverage type.
The tool computes AGI as Gross Income − Above-the-Line Adjustments. It does not approximate. Each adjustment uses the exact IRS cap for tax year 2024. Limitation: this calculator does not handle passive activity loss rules, net operating loss carryforwards, or foreign earned income exclusions. Those require Form 2555 or Schedule E worksheets beyond simple summation.
Formulas
The fundamental AGI equation follows IRS Form 1040 logic. Gross income aggregates all taxable income sources, and above-the-line adjustments reduce it before any standard or itemized deductions apply.
Where Gross Income is computed as:
Where W = Wages, salaries, tips (W-2 Box 1); I = Taxable interest (1099-INT); D = Ordinary dividends (1099-DIV); CG = Capital gains or losses (net, Schedule D); B = Business income or loss (Schedule C net); R = Rental/royalty income (Schedule E); RT = Retirement distributions (taxable portion); O = Other income (gambling, jury duty, etc.).
The self-employment tax deduction is calculated internally:
Student loan interest deduction uses a phaseout formula when MAGI falls within the phaseout range:
Where for single filers: Floor = $80,000 and Ceiling = $95,000. For MFJ: Floor = $165,000 and Ceiling = $195,000.
Reference Data
| Adjustment (Above-the-Line) | IRS Line / Form | 2024 Maximum | Eligibility Notes |
|---|---|---|---|
| Educator Expenses | Schedule 1, Line 11 | $300 (600 joint) | K-12 teachers with ≥ 900 hours |
| HSA Deduction (Self-only) | Form 8889 → Sch 1, Line 13 | $4,150 | Must have HDHP coverage |
| HSA Deduction (Family) | Form 8889 → Sch 1, Line 13 | $8,300 | Must have HDHP coverage |
| HSA Catch-up (age ≥ 55) | Form 8889 | $1,000 additional | Added to self-only or family limit |
| SE Tax Deduction (50%) | Schedule SE → Sch 1, Line 15 | No cap (calculated) | 50% of SE tax |
| SE Health Insurance | Schedule 1, Line 17 | Limited to SE net profit | Not eligible if employer plan available |
| IRA Deduction | Schedule 1, Line 20 | $7,000 (< 50) / $8,000 (≥ 50) | Phaseout if covered by workplace plan |
| Student Loan Interest | Schedule 1, Line 21 | $2,500 | Phaseout: Single $80,000 - 95,000 MAGI |
| Student Loan Interest (MFJ) | Schedule 1, Line 21 | $2,500 | Phaseout: MFJ $165,000 - 195,000 MAGI |
| Alimony Paid | Schedule 1, Line 19a | No cap | Divorce/separation before 2019 only |
| Moving Expenses (Military) | Form 3903 → Sch 1, Line 14 | Actual expenses | Active-duty military orders only |
| Penalty on Early Savings Withdrawal | Schedule 1, Line 18 | Actual penalty | Reported on 1099-INT/OID |
| Archer MSA Deduction | Form 8853 → Sch 1, Line 23 | Varies | Rare; mostly grandfathered accounts |
| Domestic Production (DPAD) | Repealed for individuals after TCJA | 0 | Only for certain pass-throughs pre-2018 |
| Tuition and Fees | Expired after 2020 | 0 | Replaced by expanded Lifetime Learning Credit |
| Self-Employment Tax Rate | Schedule SE | 15.3% | 12.4% SS + 2.9% Medicare |
| SE Tax Base Multiplier | Schedule SE | 92.35% | Net SE × 0.9235 |
| SS Wage Base (2024) | IRS Notice | $168,600 | Only SS portion capped; Medicare uncapped |
| Additional Medicare Tax | Form 8959 | 0.9% above threshold | Single: $200,000; MFJ: $250,000 |