What Is Adjusted Gross Income (AGI)? 2026 Definition, Calculation & Why It Matters
Adjusted gross income (AGI) is your total gross income from all sources minus specific above-the-line deductions permitted by the IRS under IRC Section 62. Found on Line 11 of Form 1040, AGI is the number that controls eligibility for dozens of tax credits, deductions, and programs: including Roth IRA contributions, ACA subsidies, student loan deductions, and Medicare premiums. This AGI 2026 guide covers what AGI is, how to calculate it, every above-the-line deduction available, AGI vs MAGI, and the critical OBBBA clarification that most sources get wrong.
Adjusted Gross Income Definition: IRS and IRC §62
The IRS defines adjusted gross income through IRC Section 62 as gross income minus a specific enumerated list of deductions. The word "adjusted" refers to these above-the-line adjustments that bring gross income down to AGI. Your adjusted gross income is your total gross income from all sources minus certain adjustments listed on Schedule 1 of Form 1040. AGI is calculated before you take your standard or itemized deduction.
AGI Formula: IRC §62
Authority: IRS Definition of Adjusted Gross Income · 26 U.S. Code §62 · IRS Form 1040 Schedule 1 Part II · IRS Notice 2025-67 (2026 thresholds)
Complete AGI calculation: $75,000 salary, multiple income sources and deductions, single filer 2026
All Above-the-Line Deductions That Reduce AGI in 2026
Above-the-line deductions are subtracted before reaching AGI: meaning you get them even if you take the standard deduction. They are found on Schedule 1 Part II of Form 1040. Every dollar of above-the-line deduction reduces AGI and can trigger a cascading benefit across multiple AGI-based thresholds.
| Deduction | 2026 limit | Who qualifies | Reduces FICA? |
|---|---|---|---|
| Traditional 401k / 403b contribution | $24,500 ($32,500 age 50+) | Employees with employer plan | No: FICA on gross wages |
| Traditional IRA deduction | $7,000 ($8,000 age 50+) | Income limits if covered by workplace plan | No |
| SEP-IRA contribution | 25% of net SE income, max $69,000 | Self-employed only | No |
| SIMPLE IRA contribution | $16,500 ($19,500 age 50+) | Employees of SIMPLE IRA employers | No |
| HSA contribution (above-the-line) | $4,300 single / $8,550 family | HDHP enrollees | Yes (via Section 125 payroll) |
| Student loan interest | Up to $2,500 | Phase-out at $80K to $95K single, $165K to $195K MFJ | No |
| Self-employment tax deduction | 50% of SE tax paid | Self-employed with net SE income | No |
| Self-employed health insurance | 100% of premiums paid | Self-employed: cannot exceed net SE income | No |
| Alimony paid | Actual amount paid | Divorce agreements finalized before Jan 1, 2019 only | No |
| Educator expenses | $300 ($600 MFJ both educators) | K-12 teachers and instructors | No |
| Performing artist expenses | Varies | Qualifying performing artists (AGI under $16,000) | No |
| Moving expenses (military) | Actual expenses | Active duty military members only | No |
| Charitable contributions (NEW 2026) | $1,000 single / $2,000 MFJ | All filers taking standard deduction | No |
| Jury duty pay (if surrendered to employer) | Amount surrendered | Employees required to remit jury pay | No |
Source: IRS Schedule 1 Part II, IRC §62, IRS Notice 2025-67 (2026 limits). 401k limit per IRS Notice 2025-67. HSA limits per Rev. Proc. 2025-32. Charitable contributions above-the-line deduction new for 2026 per OBBBA P.L. 119-21 Section 1401. Traditional IRA deduction phase-outs: $79,000 to $89,000 single (covered by workplace plan), $126,000 to $146,000 MFJ (filer covered).
OBBBA 2026: What Reduces AGI and What Does NOT
The OBBBA (One Big Beautiful Bill Act, P.L. 119-21) created several new deductions for 2026. Understanding which ones reduce AGI and which do not is essential for tax planning: because only deductions above the AGI line affect eligibility for AGI-based benefits like Roth IRA contributions and Medicare premiums.
| OBBBA deduction | 2026 limit | Form 1040 location | Reduces AGI? | Reduces taxable income? |
|---|---|---|---|---|
| Qualified tips deduction | Up to $25,000 | Schedule 1-A → Line 13b | No | Yes |
| Qualified overtime premium deduction | $12,500 single / $25,000 MFJ | Schedule 1-A → Line 13b | No | Yes |
| Car loan interest deduction | Up to $10,000 | Schedule 1-A → Line 13b | No | Yes |
| Senior bonus deduction (age 65+) | Up to $6,000 | Schedule 1-A → Line 13b | No | Yes |
| Charitable contributions (cash, standard deduction) | $1,000 / $2,000 MFJ | Schedule 1, Part II → Line 10 | Yes: reduces AGI | Yes |
Source: IRC §62(a) (above-the-line deductions), OBBBA P.L. 119-21, National Tax Tools analysis of Schedule 1-A placement. The charitable contribution above-the-line deduction is the only new OBBBA provision that reduces AGI.
AGI vs MAGI: Modified Adjusted Gross Income and Roth IRA AGI Limit
Modified adjusted gross income (MAGI) is AGI with certain specific deductions added back. There is no single MAGI definition: the IRS uses different add-back formulas depending on which benefit is being evaluated. MAGI is always equal to or higher than AGI.
| Tax benefit or threshold | MAGI = AGI plus these add-backs | 2026 phase-out threshold |
|---|---|---|
| Roth IRA eligibility | AGI + traditional IRA deduction + student loan interest + foreign earned income exclusion | $150K to $165K single / $236K to $246K MFJ |
| Traditional IRA deductibility | AGI (same as AGI for most workers) | $79K to $89K single (covered) / $126K to $146K MFJ |
| ACA marketplace premium tax credit | AGI + foreign earned income + tax-exempt interest + excluded income | 100% to 400% of federal poverty line |
| Medicare IRMAA surcharges | AGI + tax-exempt interest income | $106K single / $212K MFJ triggers first surcharge |
| Child Tax Credit ($2,200/child) | AGI (MAGI same as AGI for most) | $200K single / $400K MFJ |
| American Opportunity Credit | AGI + foreign earned income exclusion | $80K to $90K single / $160K to $180K MFJ |
| Student loan interest deduction | AGI + student loan interest itself | $80K to $95K single / $165K to $195K MFJ |
| Net Investment Income Tax (NIIT) | AGI + excluded foreign income | $200K single / $250K MFJ (3.8% rate) |
Sources: IRC §408A(c)(3) (Roth IRA), IRC §36B (ACA PTC), IRC §1411 (NIIT), IRS Notice 2025-67 (2026 thresholds). Phase-out ranges reflect 2026 inflation adjustments per Rev. Proc. 2025-28.
Why AGI Matters: The Income Cliffs That Cost Thousands
AGI controls eligibility for a long list of tax benefits. Some phase out gradually: benefits decrease incrementally as AGI rises. Others have sharp cliff edges where crossing one dollar over the threshold triggers a large sudden cost. The Medicare IRMAA cliff is the most extreme example.
The Medicare IRMAA cliff: $2 of extra MAGI costs $888 per year
| Threshold | Single filer | Married filing jointly | Consequence of crossing |
|---|---|---|---|
| Roth IRA phase-out begins | $150,000 MAGI | $236,000 MAGI | Roth IRA contribution limit begins declining |
| Roth IRA eliminated | $165,000 MAGI | $246,000 MAGI | No direct Roth IRA contribution allowed |
| Student loan interest phases out | $80,000 AGI | $165,000 AGI | $2,500 deduction begins declining |
| Child Tax Credit phases out | $200,000 MAGI | $400,000 MAGI | $2,200/child credit declines by $50 per $1,000 over |
| Medicare IRMAA Tier 1 | $106,000 MAGI | $212,000 MAGI | +$74/month Part B surcharge = +$888/year |
| Medicare IRMAA Tier 2 | $133,000 MAGI | $266,000 MAGI | +$185.90/month surcharge |
| NIIT 3.8% applies | $200,000 MAGI | $250,000 MAGI | 3.8% on net investment income above threshold |
| Additional Medicare Tax 0.9% | $200,000 wages | $250,000 wages | 0.9% on wages above threshold |
How to Reduce Adjusted Gross Income: Strategies for 2026
Reducing AGI is more valuable than most workers realize because each dollar of AGI reduction saves income tax AND may unlock additional tax benefits. The most powerful strategies reduce AGI and simultaneously improve eligibility for multiple AGI-gated benefits.
| Strategy | Max AGI reduction | Also reduces FICA? | Best for |
|---|---|---|---|
| Maximize traditional 401k contributions | $24,500 ($32,500 age 50+) | No | Everyone with employer plan: largest single lever |
| HSA contributions (payroll, Section 125) | $4,300 single / $8,550 family | Yes | HDHP enrollees: also reduces FICA (rare) |
| Traditional IRA deduction | $7,000 ($8,000 age 50+) | No | Workers without workplace plan, or low-income spouses |
| SEP-IRA or Solo 401k (self-employed) | Up to $69,000 | No | Self-employed with high net income |
| Student loan interest | $2,500 | No | Workers under $80K AGI with qualifying loans |
| Cash charitable contribution (new 2026) | $1,000 / $2,000 MFJ | No | Anyone taking standard deduction who donates cash |
| Self-employed health insurance deduction | 100% of premiums | No | Self-employed paying own health insurance |
| Educator expenses | $300 | No | K-12 teachers and instructors |
Common AGI Mistakes
Confusing AGI with taxable income
AGI is NOT what you pay tax on. Taxable income is AGI minus the standard deduction ($16,100 single) or itemized deductions. A $70,000 AGI becomes $53,900 in taxable income after the standard deduction. Tax brackets apply to taxable income, not AGI.
Thinking OBBBA tips deduction reduces AGI
Tips are still in your gross income and still in your AGI. The OBBBA tips deduction on Schedule 1-A reduces taxable income but not AGI. Tips workers near Roth IRA or ACA subsidy thresholds cannot use this deduction to improve their eligibility: it has no effect on AGI-based calculations.
Using last year's AGI thresholds
AGI thresholds are adjusted for inflation each year. The 2026 Roth IRA phase-out is $150,000 single, up from $146,000 in 2025. The Medicare IRMAA threshold is $106,000 for 2026. Always use current-year thresholds for planning: prior year numbers can lead to wrong eligibility assumptions.
Forgetting that Roth 401k contributions do not reduce AGI
Roth 401k contributions use after-tax money: they do not reduce AGI or taxable income. Only traditional 401k contributions reduce AGI. Workers who contribute to Roth 401k and are near the Roth IRA MAGI limit should consider switching to traditional contributions to bring MAGI below the Roth IRA eligibility threshold.
Adjusted Gross Income: Frequently Asked Questions
What is adjusted gross income (AGI)?
Adjusted gross income is your total gross income from all sources minus specific above-the-line deductions defined in IRC Section 62. It appears on Line 11 of IRS Form 1040 and is calculated before the standard deduction or itemized deductions are applied. Common deductions that reduce AGI include traditional 401k contributions, IRA deductions, student loan interest, HSA contributions, and the new 2026 charitable contribution deduction ($1,000 single, $2,000 MFJ). AGI is the starting point for calculating taxable income and for determining eligibility for dozens of tax benefits. See our gross income guide for how gross income is calculated before AGI.
How to calculate adjusted gross income: step by step for 2026?
Start with total gross income from all sources (wages, interest, dividends, 1099 income, capital gains). Then subtract all above-the-line deductions you qualify for: traditional 401k or IRA contributions, HSA contributions ($4,300 single limit), student loan interest (up to $2,500), SE tax deduction if self-employed, self-employed health insurance, and the new 2026 charitable contribution deduction ($1,000 single). The result is your AGI on Form 1040 Line 11. Use the paycheck calculator to see how pre-tax 401k and HSA contributions reduce your taxable wages and AGI simultaneously.
What is the difference between AGI and taxable income?
AGI is gross income minus above-the-line deductions. Taxable income is AGI minus the standard deduction ($16,100 single, $32,200 MFJ in 2026) or itemized deductions. Example: $80,000 gross income minus $6,000 in above-the-line deductions equals $74,000 AGI. $74,000 AGI minus $16,100 standard deduction equals $57,900 taxable income. Your tax brackets apply to the $57,900, not the $80,000 or $74,000. See our 2026 federal tax brackets guide to see what tax rate applies to your taxable income.
What is the difference between AGI and MAGI?
MAGI (modified adjusted gross income) is AGI with certain deductions added back. There are seven different MAGI calculations for different purposes. For Roth IRA eligibility: MAGI = AGI + traditional IRA deduction + student loan interest + foreign earned income exclusion. For Medicare IRMAA surcharges: MAGI = AGI + tax-exempt interest. MAGI is always equal to or higher than AGI. The 2026 Roth IRA phase-out starts at $150,000 MAGI for single filers. Medicare IRMAA Tier 1 begins at $106,000 MAGI for single filers.
Do OBBBA tips and overtime deductions reduce my AGI?
No. The OBBBA tips deduction (up to $25,000) and overtime deduction ($12,500 single) are entered on Schedule 1-A and flow to Form 1040 Line 13b: below the AGI line. They reduce taxable income but not AGI. Tips are still included in your gross income and your AGI. This means these deductions have no effect on Roth IRA eligibility, ACA subsidy calculations, or Medicare IRMAA thresholds: all of which use AGI or MAGI. The only new OBBBA provision that reduces AGI is the charitable contributions above-the-line deduction ($1,000 single).
Where do I find my AGI on my tax return?
Your AGI is on Line 11 of IRS Form 1040. For e-filing verification, the IRS requires your prior year AGI: find it on Line 11 of your 2025 Form 1040, or use the IRS Get Transcript tool at IRS.gov. Your W-2 does not show AGI: it shows gross wages. AGI is calculated on your completed Form 1040 after all Schedule 1 Part II adjustments are applied. If you use tax software, it calculates AGI automatically from the income and deduction information you enter.
What is a good AGI to have in 2026?
There is no universally "good" AGI: the ideal level depends on which benefits you are trying to preserve. Workers near the Roth IRA phase-out ($150,000 single MAGI) should reduce AGI through 401k and HSA contributions to stay below the threshold. Workers near Medicare IRMAA cliffs ($106,000 single MAGI) benefit enormously from each dollar of AGI reduction. For most workers under $80,000 AGI, the focus is maximizing above-the-line deductions to reduce taxable income and preserve the student loan interest deduction. Use our federal income tax calculator to model different AGI scenarios.
Does a 401k contribution reduce my AGI?
Yes: traditional 401k contributions reduce AGI dollar for dollar. A $6,000 traditional 401k contribution reduces your AGI by $6,000, saving approximately $1,320 in federal income tax at the 22% bracket. The 401k contribution does not reduce FICA (Social Security and Medicare): those are calculated on gross wages. Roth 401k contributions do NOT reduce AGI: they use after-tax dollars. HSA contributions through payroll (Section 125) reduce both AGI and FICA. See the 401k calculator for the full retirement savings and tax impact.
How does AGI affect health insurance subsidies?
ACA marketplace premium tax credits (PTC) are calculated based on MAGI as a percentage of the federal poverty line ($15,060 for a single person in 2026). Higher MAGI means smaller subsidies: and there is no cliff like Medicare IRMAA. The phase-out is gradual. Reducing MAGI through above-the-line deductions (401k, IRA, HSA) directly increases ACA subsidy amounts. Workers just above the 400% poverty line threshold ($60,240 single in 2026) who reduce MAGI below that level can unlock substantial premium tax credits. Self-employed workers with variable income should pay particular attention to MAGI management for ACA purposes.