No. MAGI does not include the standard deduction, and the standard deduction does not reduce MAGI. Modified adjusted gross income starts from adjusted gross income (AGI), and the standard deduction is only subtracted after AGI, on the way to taxable income. The same is true if you itemize: mortgage interest, state and local taxes and charitable gifts lower taxable income, never AGI or MAGI.
For a household earning $600,000 to $1.2 million, that distinction decides which income tests you pass or fail. Almost every income limit in the tax code, from Roth IRA eligibility to the 3.8% Net Investment Income Tax, looks at MAGI. So the useful question is not which deduction to take. It is which dollars ever reach AGI in the first place.
Where MAGI sits on Form 1040
The return runs in a fixed order. Each step feeds the next:
- Total income. W-2 wages (including RSU vests), interest, dividends, capital gains, K-1 income.
- Adjustments. A short list of “above-the-line” items, such as a deductible traditional IRA contribution or HSA contributions made outside payroll.
- AGI. Total income minus those adjustments. On the 2025 Form 1040 this is line 11a.
- MAGI. AGI with a few items added back or taken out. The exact recipe depends on which rule is asking.
- Standard or itemized deduction. Subtracted from AGI, not from MAGI.
- Taxable income. What the brackets apply to.
Because the deduction comes after AGI, it cannot touch MAGI. For a married couple filing jointly, the standard deduction is $32,200 for 2026 (IRS Rev. Proc. 2025-32). It lowers the tax you owe. It does not move you under any MAGI limit.
How MAGI is calculated: there are several versions
“MAGI” is not one number. Each provision defines its own. For most W-2 families with no foreign income, every version below ends up equal to AGI, or very close to it.
| Rule | How MAGI is figured | Primary source |
|---|---|---|
| Roth IRA contributions | AGI, minus income from Roth conversions and rollovers, plus any traditional IRA deduction, student loan interest deduction, foreign earned income or housing exclusion, foreign housing deduction, excludable savings bond interest and excluded employer-provided adoption benefits | IRS Pub 590-A, Worksheet 2-1 |
| Net Investment Income Tax | AGI plus any foreign earned income exclusion (with related adjustments) | Form 8960 instructions |
| Child Tax Credit | AGI plus certain excluded foreign and territory income | Schedule 8812 |
| SALT cap phase-down | AGI plus certain excluded foreign and territory income | P.L. 119-21, §70120 |
Notice what is missing from every row: the standard deduction and itemized deductions. A common myth is that “half of self-employment tax” or tax-exempt interest is added back. Neither is part of the Roth IRA or NIIT definitions. Municipal bond interest is added back for some other programs, such as ACA premium credits, which rarely apply to families with employer coverage.
What actually lowers AGI for a W-2 household
For employees, the biggest AGI levers happen in payroll, before the W-2 is printed. Pre-tax amounts never show up in Box 1 wages, so they never reach AGI. For 2026:
- Pre-tax 401(k) or 403(b) deferrals: up to $24,500 per person (IRS Notice 2025-67). Roth 401(k) deferrals and after-tax (mega backdoor) contributions do not lower AGI.
- HSA through payroll: up to $8,750 for family coverage with a qualifying high-deductible plan (Rev. Proc. 2025-19).
- Dependent care FSA: up to $7,500 per household, if your employer’s plan has adopted the higher limit (P.L. 119-21, §70404).
- Health FSA: up to $3,400 (Rev. Proc. 2025-32).
- Nonqualified deferred compensation: amounts you elect to defer are generally not taxed as wages in the year deferred. Elections are usually made the year before and the money carries employer credit risk.
What does not lower AGI: the standard deduction, itemized deductions, Roth contributions, 529 contributions (California allows no state deduction either) and gifts to a child’s UTMA account.
Worked example: a $930,000 California household with RSUs
Assumptions (illustrative, 2026): married filing jointly in San Jose, two children ages 4 and 8. One spouse earns $420,000 in salary and bonus plus $260,000 of RSU vests. The other earns $200,000 as a physician. The family has $20,000 of interest and dividends and a $30,000 long-term gain from selling older RSU shares.
| Line | Amount |
|---|---|
| Wages including RSU vests | $880,000 |
| Less pre-tax 401(k), both spouses ($24,500 x 2) | ($49,000) |
| Less family HSA via payroll | ($8,750) |
| Less dependent care FSA | ($7,500) |
| Plus interest, dividends and gains | $50,000 |
| AGI and MAGI | $864,750 |
| Less 2026 standard deduction | ($32,200) |
| Taxable income (if they take the standard deduction) | $832,550 |
If they itemize instead, taxable income changes. MAGI stays at $864,750 either way. Here is what that MAGI means for 2026:
| Income test (2026) | Threshold | Result at $864,750 |
|---|---|---|
| Direct Roth IRA contribution | Phases out between $242,000 and $252,000 MFJ | Not allowed. A backdoor Roth (nondeductible IRA contribution, then conversion) is the usual route, subject to the pro-rata rule for a spouse who holds pre-tax IRA money (each spouse’s IRAs are counted separately). |
| Child Tax Credit, $2,200 per child | Reduced by $50 per $1,000 of MAGI over $400,000 | $0. With two children the credit reaches zero at $488,000. |
| Net Investment Income Tax, 3.8% | MAGI over $250,000 MFJ | Owed on the lesser of investment income ($50,000) or the excess over the threshold: $1,900. |
| SALT deduction cap | $40,400, reduced by 30% of MAGI over $505,000, never below $10,000 | $10,000. The reduction ($107,925) pushes the cap to its floor. |
Two lessons. First, at this income every one of these thresholds is already far behind the family, so switching between the standard and itemized deduction changes none of the results. Second, the NIIT applies to every dollar of investment income they add. Holding RSU shares after vest and selling later turns growth into capital gain. If the shares are held more than a year, that gain is taxed at 15% or 20% federally plus 3.8% (at ordinary rates plus 3.8% if held a year or less), and at ordinary rates in California, since California has no lower rate for capital gains (FTB). Selling at vest produces little or no gain, because the vest value is already taxed as wages.
One more line that is not a MAGI test: the 0.9% Additional Medicare Tax is measured on Medicare wages over $250,000 for joint filers. Pre-tax 401(k) deferrals do not reduce Medicare wages, so the standard deduction question is irrelevant there too.
Washington families: AGI matters more from 2028
Washington has no wage income tax in 2026 (WA DOR). That changes for high earners. Under SB 6346, a 9.9% tax applies to individuals and joint filers with AGI over $1,000,000, effective January 1, 2028. DOR has not yet published how income will be calculated (DOR FAQ), but the trigger it describes is adjusted gross income, and if that follows the federal definition, the standard deduction will not lower it. A Bellevue household with $1.1 million of wages and RSUs should expect to be above that line whichever deduction it takes. Pre-tax payroll choices may matter at the margin; deductions below AGI will not.
Washington’s separate 7% capital gains tax (9.9% on taxable gains over $1,000,000) is figured from long-term capital gains, not MAGI, with a $278,000 standard deduction for 2025, the latest amount DOR has published.
Common mistakes we see at this income level
- Assuming a big itemized year gets you under a limit. A large charitable gift or property tax payment lowers taxable income, not MAGI. It will not reopen a direct Roth IRA or the Child Tax Credit.
- Forgetting the RSU vest is wages. Vesting shares count in AGI even if you never sell. Federal withholding at the 22% supplemental rate typically leaves a balance due in the 35% and 37% brackets.
- Electing to report a child’s investment income on your return. The Form 8814 election is available only in limited cases, such as a child under 19 whose only income is interest and dividends totaling more than $1,350 and less than $13,500 for 2026. It adds the amount above $2,700 to your AGI and counts it as net investment income for the 3.8% tax (Form 8814 instructions).
- Doing a Roth conversion without checking the NIIT line. Conversion income is excluded from Roth IRA MAGI, but it is still part of AGI for other tests.
What to write down for your kids
Children see the result of your tax decisions (a bigger or smaller refund, a Roth account in their name one day) but not the reasoning. A one-page note each year on why you chose pre-tax or Roth deferrals, why you sold or held RSUs, and how you thought about giving turns a filing season into something they can learn from. As Kevin Luu, Co-Founder and Chief Learning Officer of Bright Advisers, puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.” That note belongs in your FamilyKnowledge® Library.
Frequently asked questions
Is MAGI before or after the standard deduction?
Before. MAGI is built from AGI, and AGI is figured before any standard or itemized deduction. The standard deduction ($32,200 for joint filers in 2026) is subtracted afterward to reach taxable income. That order is the same for every MAGI definition the IRS uses, including Roth IRA limits, the Child Tax Credit and the Net Investment Income Tax.
Is MAGI the same as AGI?
Often, for W-2 families with no foreign income, the numbers match. MAGI differs when you have add-backs such as a foreign earned income exclusion, a deductible traditional IRA contribution or student loan interest (for Roth purposes), or when Roth conversion income is taken out for the Roth IRA test. Always check which rule’s MAGI you are measuring.
Where can I find my MAGI on my tax return?
It is not printed on Form 1040. Start with AGI (line 11a on the 2025 form), then apply the worksheet for the rule in question, such as Worksheet 2-1 in IRS Publication 590-A for Roth IRAs or the MAGI worksheet in the Form 8960 instructions for the 3.8% tax.
Next step
Pull last year’s return and find your AGI. Then list which of the thresholds above you are near, not just over. If a number sits within $50,000 of a line, that is where payroll elections and the timing of RSU sales deserve a conversation. For more on those levers, see our tax management, equity compensation and retirement and employee benefits pages, and our guides to reducing MAGI and how brokerage accounts are taxed. If you want a second set of eyes on the whole picture, the Tax & Wealth Assessment is a good place to start.
This article is general education, not individual tax advice. The right move depends on your family’s full picture. Reviewed on September 30, 2026.
Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.
Connect on LinkedIn → · About KevinThis is part of how we approach Tax Management for high-income W-2 families at Bright Advisers.
Keep reading