Learning how to reduce MAGI usually comes down to a small set of legal levers that lower adjusted gross income or the items added back to it: qualified charitable distributions, health savings account contributions, capital-loss harvesting, and careful timing of income events such as Roth conversions. Modified adjusted gross income (MAGI) is not one number; each program defines it slightly differently, so the tactic that helps in one system may not touch another.
MAGI can often be lowered by reducing AGI (through HSA contributions, capital-loss harvesting, or pre-tax retirement deferrals) or by cutting income that flows into it. A qualified charitable distribution of up to $111,000 for 2026 can satisfy an RMD while keeping that amount out of AGI entirely (Source: IRS Notice 2025-67).
What MAGI is and why lowering it matters
MAGI, or modified adjusted gross income, is your adjusted gross income (AGI) plus specific items added back, and it acts as the eligibility test for several tax and benefit programs. Because each program starts from AGI and adds different items, there is no single MAGI figure that applies everywhere (Source: IRS Pub 974, 2025).
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The practical reason people search for how to reduce MAGI is that four separate systems use it as a threshold, and crossing a line can trigger higher costs or lost benefits. Lowering the underlying AGI is one direct approach, since AGI feeds every MAGI calculation before any add-backs.
Some programs, such as Medicare’s IRMAA surcharge, use a cliff structure: a single dollar over a threshold can move you into the next bracket for the entire year (Source: SSA POMS HI 01101.020, rev. 12/02/2025). That cliff design is why precise, year-by-year MAGI management can matter more than the size of any one deduction.
The four programs MAGI controls in 2026
Four systems use MAGI as a threshold, and each defines MAGI differently, so a strategy should be matched to the specific program it targets. The table below summarizes the 2026 rules for Medicare IRMAA, ACA premium tax credits, the Net Investment Income Tax (NIIT), and Roth IRA contribution eligibility.
| Program | How MAGI is defined | 2026 threshold detail |
|---|---|---|
| Medicare IRMAA (Part B/D surcharge) | AGI + tax-exempt interest, using the tax return from 2 years prior | Surcharge begins above $109,000 single / $218,000 MFJ (Source: SSA POMS HI 01101.020, rev. 12/02/2025) |
| ACA Premium Tax Credit | AGI + tax-exempt interest + excluded foreign earned income + nontaxable Social Security | Household income generally must be 100% to 400% of the federal poverty line (Source: IRS Eligibility for the Premium Tax Credit, 2025) |
| Net Investment Income Tax (NIIT) | AGI + excluded foreign earned income (net of related deductions) | Statutory, not inflation-indexed: $250,000 MFJ / $200,000 single / $125,000 MFS (Source: IRC section 1411(b); Form 8960 instructions) |
| Roth IRA contribution eligibility | A modified AGI defined in the Roth rules | Phase-out $153,000 to $168,000 single; $242,000 to $252,000 MFJ (Source: IRS Notice 2025-67) |
Because the definitions differ, a lever that lowers AGI (such as an HSA contribution) helps with all four, while a lever that only removes an item already outside a particular MAGI definition may not. Matching the tactic to the target program is the recurring theme of every section below.
How the Medicare IRMAA cliff makes MAGI timing matter
IRMAA is a high-income surcharge added to Medicare Part B and Part D premiums, and it uses MAGI (AGI plus tax-exempt interest) from the tax return filed two years earlier. For 2026, the surcharge starts above $109,000 for a single filer and $218,000 for a married couple filing jointly (Source: SSA POMS HI 01101.020, rev. 12/02/2025).
The standard 2026 Part B premium is $202.90 per month, with an annual Part B deductible of $283 (Source: CMS 2026 Medicare Parts A & B Premiums and Deductibles fact sheet). Above the thresholds, both a higher Part B premium and a Part D add-on apply, as shown below.
| 2026 MAGI (single / MFJ) | Total Part B premium | Part D add-on |
|---|---|---|
| At/below $109,000 / $218,000 | $202.90 (standard) | $0 |
| $109,001 to $137,000 / $218,001 to $274,000 | $284.10 | +$14.50 |
| $137,001 to $171,000 / $274,001 to $342,000 | $405.80 | +$37.50 |
| $171,001 to $205,000 / $342,001 to $410,000 | $527.50 | +$60.40 |
| $205,001 to $499,999 / $410,001 to $749,999 | $649.20 | +$83.30 |
| ≥$500,000 / ≥$750,000 | $689.90 | +$91.00 |
Because IRMAA is a cliff rather than a gradual phase-in, crossing a threshold by a single dollar can move a household into the next bracket for the whole year (Source: SSA POMS HI 01101.020, rev. 12/02/2025). Full threshold detail sits on our Medicare IRMAA 2026 brackets and premiums reference page.
How to reduce MAGI with a qualified charitable distribution
A qualified charitable distribution (QCD) lets a person age 70½ or older direct their IRA trustee to send money straight to an eligible charity, and the distributed amount is excluded from gross income. Because it never enters AGI, a QCD lowers MAGI for every program at once while it can also satisfy a required minimum distribution (Source: IRS Pub 590-B, 2025).
For 2026 the annual QCD exclusion limit is $111,000 per person, up from $108,000 in 2025, and each spouse on a joint return has a separate limit (Source: IRS Notice 2025-67). A one-time QCD to a split-interest entity is capped at $55,000 for 2026 (Source: IRS Notice 2025-67).
One difference between a QCD and an ordinary cash gift is that a standard charitable deduction reduces taxable income but not AGI, whereas a QCD keeps the money out of AGI in the first place. This distinction is relevant for retirees whose RMDs would otherwise push MAGI over an IRMAA or NIIT line. See our required minimum distributions 2026 page for how RMDs interact with these limits.
How HSA contributions and pre-tax deferrals lower AGI
Health savings account (HSA) contributions are an above-the-line deduction, meaning they reduce AGI directly and therefore reduce every version of MAGI. For 2026 the HSA contribution limit is $4,400 for self-only coverage and $8,750 for family coverage, with a statutory $1,000 catch-up for those age 55 and older (Source: IRS Rev. Proc. 2025-19).
An HSA requires a high-deductible health plan. For 2026 that means a minimum deductible of $1,700 self-only or $3,400 family, with an out-of-pocket maximum of $8,500 self-only or $17,000 family (Source: IRS Rev. Proc. 2025-19).
Pre-tax retirement deferrals work the same way by lowering AGI before any MAGI add-back. For 2026 the 401(k)-type elective deferral limit is $24,500, the traditional and Roth IRA limit is $7,500, and 401(k) catch-up amounts reach $8,000 at age 50 and $11,250 for ages 60 to 63 (Source: IRS Notice 2025-67). Our retirement contribution limits 2026 page lists these in full.
How capital-loss harvesting can trim MAGI
Capital-loss harvesting is the practice of realizing investment losses to offset realized gains, which reduces net capital gain inside AGI and therefore MAGI. Net capital losses first offset capital gains, and up to $3,000 of excess net loss ($1,500 if married filing separately) can be deducted against ordinary income each year (Source: IRS Topic no. 409, 2025).
Losses that exceed those limits do not disappear; they carry forward indefinitely to offset gains or ordinary income in future years (Source: Schedule D Form 1040 instructions, 2025). That carryforward is what lets a large loss keep reducing AGI across several tax years rather than only one.
Because reducing net investment income also affects the Net Investment Income Tax, harvesting losses can influence two things at once: the AGI that feeds MAGI, and the investment-income figure the 3.8% tax is applied to. Our Net Investment Income Tax (NIIT) 2026 page covers that interaction in depth.
How Roth conversion timing changes MAGI in the conversion year
A Roth conversion is a taxable distribution included in gross income, and thus in AGI and MAGI, in the year the conversion occurs (Source: IRS Pub 590-A, 2025). Rather than lowering MAGI, a conversion raises it for that single year, which is why timing is part of any MAGI discussion.
The higher MAGI a conversion produces can push a household into a higher IRMAA bracket, over the ACA premium-credit cliff, over a NIIT threshold, or past the Roth contribution phase-out for that year. The converted amount itself is not net investment income, but the higher MAGI can subject other investment income to the 3.8% NIIT (Source: Form 8960 instructions, 2025).
One educational point that often gets overlooked: because a Roth conversion raises MAGI only in the conversion year, some plans study how a given year’s IRMAA and bracket headroom compares before deciding how much to convert, and later Roth withdrawals do not count in MAGI at all. This is general information, not a recommendation. Our Roth conversion statistics 2026 page and the Social Security tax torpedo explainer show related timing effects.
Matching each lever to the program it affects
Because MAGI is defined differently by each program, the value of a given lever depends on which threshold a household is trying to stay under. The table below maps the four common MAGI-reduction levers to the programs they can influence in 2026.
| Lever | How it works | Programs it can affect |
|---|---|---|
| Qualified charitable distribution | Excludes up to $111,000 (2026) from AGI while meeting RMDs; age 70½+ (Source: IRS Notice 2025-67) | IRMAA, ACA PTC, NIIT, Roth eligibility |
| HSA / pre-tax deferrals | Above-the-line deductions that lower AGI (Source: IRS Rev. Proc. 2025-19; Notice 2025-67) | IRMAA, ACA PTC, NIIT, Roth eligibility |
| Capital-loss harvesting | Offsets gains; up to $3,000/yr against ordinary income (Source: IRS Topic no. 409, 2025) | IRMAA, ACA PTC, NIIT, Roth eligibility |
| Roth conversion timing | Adds to MAGI in the conversion year (Source: IRS Pub 590-A, 2025) | Raises MAGI; managed to avoid crossing thresholds |
The pattern is that AGI-reducing levers help every program, while income-timing levers such as conversions are managed to avoid crossing a threshold in a given year. Which approach fits depends on a household’s income sources, age, and the specific line it is closest to.
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Q3 Advisors is a registered investment adviser focused on retirement tax planning. This article is educational and is not advice; for guidance on your own circumstances, consult a qualified tax or financial professional.
Frequently asked questions
What is the difference between AGI and MAGI?
AGI is adjusted gross income, the figure at the bottom of the first page of Form 1040 after above-the-line deductions. MAGI is AGI plus certain items added back, and each program adds back different items. For example, Medicare IRMAA adds tax-exempt interest, while the ACA credit also adds excluded foreign income and nontaxable Social Security (Source: IRS Pub 974, 2025).
Does reducing MAGI lower my Medicare premiums?
It can, if it keeps MAGI below an IRMAA threshold. IRMAA uses MAGI from two years prior, so 2026 surcharges rest on the 2024 return. The surcharge is a cliff: staying at or below $109,000 single or $218,000 MFJ for 2026 avoids it entirely, while one dollar over moves you into the next bracket (Source: SSA POMS HI 01101.020, rev. 12/02/2025).
Do Roth conversions increase MAGI?
Yes. A Roth conversion is a taxable distribution included in gross income, so it raises AGI and MAGI in the year of the conversion (Source: IRS Pub 590-A, 2025). The converted amount is not net investment income itself, but the higher MAGI can subject other investment income to the 3.8% NIIT and can affect IRMAA (Source: Form 8960 instructions, 2025).
Can a qualified charitable distribution reduce MAGI?
Yes. A QCD sends IRA money directly to charity and excludes that amount from gross income, so it never enters AGI or MAGI, unlike an ordinary charitable deduction. It is available at age 70½ or older, and the 2026 exclusion limit is $111,000 per person, with each spouse on a joint return having a separate limit (Source: IRS Notice 2025-67).
What income counts toward MAGI for Roth IRA contributions?
Roth contribution eligibility uses a modified AGI, and for 2026 the phase-out is $153,000 to $168,000 for single filers and $242,000 to $252,000 for married couples filing jointly (Source: IRS Notice 2025-67). Above the top of the range, direct Roth contributions are barred, though AGI-reducing steps such as HSA or pre-tax deferrals may keep MAGI within range.
Are NIIT thresholds adjusted for inflation each year?
No. The Net Investment Income Tax thresholds are statutory and have not been indexed for inflation since 2013: $250,000 for married filing jointly, $200,000 for single and head of household, and $125,000 for married filing separately (Source: IRC section 1411(b); Form 8960 instructions). Because they are fixed, rising income can push more households over the line over time.
Sources
SSA POMS HI 01101.020 (rev. 12/02/2025), https://secure.ssa.gov/poms.nsf/lnx/0601101020 · CMS, 2026 Medicare Parts A & B Premiums and Deductibles fact sheet, https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles · IRS, Eligibility for the Premium Tax Credit, https://www.irs.gov/affordable-care-act/individuals-and-families/eligibility-for-the-premium-tax-credit · IRS Pub 974, https://www.irs.gov/pub/irs-pdf/p974.pdf · IRC section 1411(b), https://www.law.cornell.edu/uscode/text/26/1411 · IRS Form 8960 instructions, https://www.irs.gov/instructions/i8960 · IRS Notice 2025-67, https://www.irs.gov/pub/irs-drop/n-25-67.pdf · IRS Rev. Proc. 2025-19, https://www.irs.gov/pub/irs-drop/rp-25-19.pdf · IRS Pub 969, https://www.irs.gov/publications/p969 · IRS Topic no. 409, https://www.irs.gov/taxtopics/tc409 · IRS Schedule D (Form 1040) instructions, https://www.irs.gov/instructions/i1040sd · IRS Pub 590-A, https://www.irs.gov/publications/p590a · IRS Pub 590-B, https://www.irs.gov/publications/p590b
