How to Lower Your MAGI for a Bigger ACA Subsidy in 2026

Decision Guide Published May 21, 2026 · 10 min read

Your modified adjusted gross income is the single number that determines whether you get a marketplace subsidy and how big it is. Until last December, getting the number slightly wrong was forgiving — the 2021–2025 enhanced subsidies softened the slope and erased the cliff. As of January 1, 2026, the cliff is back. Cross 400% of the federal poverty level by one dollar and your premium tax credit drops to zero. That changes the calculus of every dollar of MAGI.

This is a guide to the legal levers that move your MAGI. None of them involve hiding income; all of them are explicitly recognized in the IRS code or in HealthCare.gov's own definition of MAGI. Most are tax-advantaged retirement or health accounts that reduce your AGI and, by extension, your MAGI. A few are timing decisions about when income lands in the calendar year. All of them matter more in 2026 than they did in 2025.

Why this matters now. Under the enhanced ARPA rules (2021–2025), a household at 410% FPL still received some premium tax credit. In 2026, the same household receives zero. For a 50-year-old in a state with a benchmark Silver premium around $700/month, that's roughly $4,000 in annual subsidy that disappears at the threshold. The levers below are how you stay on the right side of it.

First, What MAGI Actually Means for the ACA

"MAGI" is a tax term with several different definitions depending on which credit or deduction you're calculating. For the ACA premium tax credit specifically, MAGI is your adjusted gross income (the bottom of Form 1040, page 1) plus three add-backs:

Tax-exempt interest — generally interest from municipal bonds. It does not appear in your AGI but the ACA puts it back.
Foreign earned income excluded under Section 911. If you live abroad and exclude up to roughly $130,000 of earned income under the foreign earned income exclusion, that excluded amount is added back for ACA purposes.
Non-taxable Social Security benefits. Whether or not your Social Security is taxable, the full benefit amount is included in MAGI — including the portion that doesn't flow to AGI.

That's the entire ACA-MAGI add-back list. It is narrower than the MAGI used for IRA deduction phase-outs (which has its own add-back set) and narrower than the one used for Medicare IRMAA. Specifically — and this is the doorway every lever below walks through — the ACA-MAGI add-back list does not undo pre-tax retirement contributions, HSA contributions, or self-employment deductions. Anything that legitimately lowers your AGI lowers your ACA-MAGI by the same amount.

That's why the levers exist.

Lever 1: HSA Contributions (The Best One)

If you're enrolled in a high-deductible health plan that qualifies for a Health Savings Account, contributions to that HSA reduce your AGI dollar-for-dollar. The IRS finalized the 2026 limits in Revenue Procedure 2025-19:

2026 HSA contribution limit	Amount
Self-only HDHP coverage	$4,400
Family HDHP coverage	$8,750
Catch-up if 55 or older (each spouse, separate HSAs)	+$1,000

HSA contributions made through payroll deduction skip your W-2 wages entirely. Direct personal contributions (the only path available to self-employed people) are deducted on Schedule 1, line 13. Either way, the dollar lands outside of AGI.

For a married couple both 55+ on family HDHP coverage, that's up to $10,750 of AGI reduction in 2026 — frequently enough to move a household one full bracket on the FPL ladder. The HSA also has a triple-tax advantage that no other account replicates: pre-tax in, tax-free growth, tax-free out for qualified medical expenses. The catch is that you must be enrolled in an HSA-eligible HDHP (minimum $1,700 deductible for self-only, $3,400 for family in 2026), which on the marketplace means choosing a specific subset of Bronze or Silver plans. If your existing plan is HSA-eligible, this is almost always the highest-leverage move.

Lever 2: Traditional 401(k) and Other Pre-Tax Workplace Plans

Money you direct into a traditional (not Roth) 401(k), 403(b), 457, or TSP never lands in AGI. Per the IRS 2026 contribution-limit release, the elective deferral limit is $24,500, with a $8,000 catch-up at 50+ and a higher $11,250 catch-up for ages 60–63 under SECURE 2.0. Self-employed people running a Solo 401(k) get the same employee limit plus an employer contribution side.

The lever here is timing, not eligibility. A household near the cliff in October has roughly three months to redirect bonuses, year-end commissions, or final paychecks into pre-tax 401(k) buckets before the calendar year closes. A bonus shoveled into the 401(k) lowers AGI, lowers MAGI, and can be the difference between full subsidy and zero subsidy. Roth 401(k) contributions do not have this effect — they're after-tax and your AGI is unchanged.

Lever 3: Deductible Traditional IRA Contributions

The 2026 IRA contribution limit is $7,500 ($8,600 if 50 or older). For an ACA filer not covered by a workplace retirement plan, the entire contribution is deductible regardless of income. For those who are covered, deductibility phases out at:

Filing status & coverage	2026 deduction phase-out (MAGI)
Single, covered by workplace plan	$81,000 to $91,000
Married joint, contributor covered	$129,000 to $149,000
Married joint, only spouse covered	$242,000 to $252,000

Note that the MAGI used for IRA phase-out is computed slightly differently than ACA-MAGI, but for most filers in the marketplace-subsidy income range the numbers are close enough to treat as the same. A married couple with no workplace plan can contribute $15,000 ($17,200 if both 50+) entirely deductible. That's another full bracket of cliff cushion.

For an ACA filer above the IRA phase-out, the lever becomes mostly cosmetic — non-deductible IRA contributions don't reduce AGI. Below the phase-out, traditional IRA contributions stack cleanly on top of HSA and 401(k) contributions.

Lever 4: Self-Employed Levers (and the Circular Calculation)

If you're self-employed, the deduction surface is much larger. Three lines on Schedule 1 are the main lift:

Line 15 — Deductible part of self-employment tax. Automatically half your self-employment tax. Not a choice, but it's there.
Line 16 — Self-employed retirement plan contributions. SEP-IRA, SIMPLE, or Solo 401(k) employer contributions. SEP allows up to 25% of net self-employment earnings, capped at $70,000 for 2026.
Line 17 — Self-employed health insurance deduction. The premium you pay after any APTC is deductible on this line.

Line 17 introduces a wrinkle worth understanding. Your MAGI determines your premium tax credit. Your premium tax credit determines how much premium you actually paid out of pocket. Your out-of-pocket premium becomes the line 17 deduction, which feeds back into your AGI and therefore your MAGI. It's a circular calculation — and the IRS knows it.

The fix lives in Publication 974, which provides two methods: a simplified iterative worksheet, or a closed-form alternative calculation. In practice, most filers let the tax software run the iteration until the numbers converge — typically two or three passes. The point for planning purposes is that the self-employed health insurance deduction does materially lower your ACA-MAGI even after the loop settles, and it stacks with retirement contributions on the same return. For a freelancer with $90,000 of gross self-employment income and a $700/month benchmark premium, the combined effect of SEP-IRA + line 17 can move MAGI by $25,000+.

Lever 5: Timing — Capital Gains, Bonuses, and Roth Conversions

Some MAGI is voluntary in the sense that you choose when to realize it. Three common cases:

Long-term capital gains. Selling appreciated stock or a profitable fund position counts as MAGI in the year of sale. Splitting a planned sale across two tax years can keep both years below the cliff.
Roth conversions. A traditional-to-Roth IRA conversion adds the full converted amount to AGI in the year it's processed. Convert in a year where your income is already low, not in a year where you're already near the cliff. Many ACA filers in pre-retirement years pause Roth conversions while they're on subsidized marketplace coverage and resume them after Medicare eligibility at 65.
Year-end bonuses. If your employer offers a January-paid bonus option or deferred compensation, ask. Pushing a December bonus into January moves the income into a new ACA year.

None of these are evasion. They're elections the tax code explicitly anticipates.

Lever 6: Mind the Three Add-Backs

The MAGI add-backs are easy to overlook because they don't appear on your W-2 or your 1099. The three to audit:

Municipal bond income. If a substantial portion of your portfolio is in tax-exempt munis or muni bond funds, the interest doesn't hit your AGI — but it hits your ACA-MAGI. If you're choosing between munis and equivalent-yield taxable bonds in a taxable account, the ACA-MAGI implication can flip the math for filers near the cliff.
Foreign earned income exclusion. Expats sometimes assume the Section 911 exclusion makes them invisible to the ACA. It does not. The excluded income is added back, which often disqualifies the household from subsidies it might otherwise expect.
Non-taxable Social Security. The portion of Social Security that's not federally taxed is still in MAGI. This is the trap that catches early retirees who claimed Social Security at 62 and assume the non-taxable portion is "free" for ACA purposes — it isn't.

You cannot reduce MAGI by selling muni bonds halfway through the year to switch to taxable bonds — the interest you already received is still MAGI for the full year. The lever is portfolio choice for next year, not this one.

Cliff Math: A Worked Example

Consider Sarah, single, age 52, projected 2026 income of $63,000 from a mix of W-2 and consulting work. The 2026 federal poverty level for a household of one is $15,960, so 400% FPL is $63,840. Sarah is sitting roughly $840 below the cliff — close enough that a single freelance invoice could push her over.

Her unmitigated MAGI puts her at $63,000. Her benchmark Silver premium is $720/month, or $8,640/year. At 393% FPL she qualifies for a credit that caps her annual premium at 9.96% of MAGI, or about $6,275 — meaning her annual subsidy is about $2,365.

If a freelance project pushes her year-end MAGI to $64,500 — still tiny relative to her overall income — she crosses 400% FPL. Her premium tax credit collapses to zero. She owes back the $2,365 the marketplace paid on her behalf during the year, on top of receiving no further subsidy. The marginal income cost of that extra $1,500 is the $1,500 in cash plus $2,365 in vanished subsidy. The effective marginal "tax" rate on that slice of income is over 250%.

Now apply the levers. If Sarah is on an HSA-eligible plan, contributing $4,400 to her HSA drops her MAGI to $58,600 — well clear of the cliff. If she's not on an HDHP, a $3,000 traditional IRA contribution drops her to $60,000 — still clear. A $4,400 Solo 401(k) employer contribution from her consulting income drops her to $58,600. Any one of these lever pulls preserves the $2,365 subsidy and improves her tax situation. For a household near the cliff, the IRS deduction is effectively a 250%+ ROI move.

The reconciliation side of this story — what happens on Form 8962 if you guessed wrong — is covered in our premium tax credit repayment guide. The mechanics of the cliff itself are in the 2026 subsidy cliff explainer.

When Lowering MAGI Crosses Into Medicaid Territory

Pulling MAGI down is usually a clear win, but at the bottom of the marketplace range it can change which program you qualify for. In Medicaid-expansion states, adults under 138% FPL ($20,873 for a household of one in 2026) qualify for Medicaid instead of marketplace coverage. For most filers Medicaid is the cheaper choice — it's free, covers more, and has no premium reconciliation risk. But if you're already enrolled in a specific marketplace plan with a doctor or provider network you depend on, dropping below the line can force a mid-year coverage change.

The interaction depends on your state and whether your state expanded Medicaid. Our Medicaid vs. marketplace coverage guide walks through the threshold rules, and the state-by-state Medicaid pages show the exact income limit where you live. In non-expansion states the picture changes again — adults above 100% FPL but below the local Medicaid threshold can fall into a coverage gap, and the same MAGI reduction tactics that help in expansion states can land you there.

What to Do, Concretely, Before December 31

If you're an active marketplace enrollee, the practical playbook for the rest of 2026:

Project your year-end MAGI now. Use a Q3 paystub or P&L plus a realistic projection for the remaining months. Add back the three items above.
Plot your MAGI against the 400% FPL line for your household size. The 2026 numbers: $63,840 (household of 1), $86,560 (household of 2), $109,280 (household of 3), $132,000 (household of 4), plus $22,720 for each additional member.
If you're within $10,000 of the cliff, review your lever options in this order: maxing HSA (if eligible), increasing 401(k) elective deferral for the remaining paychecks, opening or topping up a traditional IRA, and — if self-employed — making a Solo 401(k) or SEP-IRA contribution before the tax filing deadline.
If your projection crossed the cliff already, the repayment calculator shows exactly what you'll owe back if you take no action. The same calculator with a lowered MAGI shows what each lever pull saves you.
If you're below 400% FPL and want a bigger subsidy, the same levers help, just less dramatically — the subsidy is sliding-scale below the cliff, not binary. Every $1,000 of MAGI reduction near 300% FPL is worth roughly $80–$130 in additional credit, depending on your benchmark premium.

See exactly what each lever saves you

Plug your projected MAGI into our subsidy calculator, then re-run it with each potential deduction subtracted — the difference is the dollar value of pulling that lever.

Open the Subsidy Calculator

Frequently Asked Questions

Does itemizing on Schedule A reduce my MAGI?

No. Itemized deductions on Schedule A (mortgage interest, SALT, charitable giving) reduce taxable income but not AGI, and therefore not MAGI. The levers that move MAGI are all "above the line" — Schedule 1 adjustments to income, HSA contributions, and pre-tax retirement contributions that never enter AGI in the first place.

Can I contribute to an HSA if I'm already on a marketplace plan?

Only if your specific marketplace plan is designated as HSA-eligible. Most Bronze plans and a subset of Silver plans qualify; Gold and Platinum plans typically do not. When shopping on the marketplace, look for plans flagged "HSA eligible." Switching plans for HSA eligibility is allowed during open enrollment or after a qualifying life event.

How late in the year can I still pull these levers?

Pre-tax 401(k) contributions must be made via payroll by your final pay period of the calendar year. HSA, traditional IRA, and SEP-IRA contributions for 2026 can be made until the April 15, 2027 tax filing deadline (or October 15 if you file an extension, for SEP-IRA). That gives you a window after the year ends to fine-tune MAGI when you have actual numbers — particularly useful for self-employed filers with variable income.

If I'm married filing separately, can I still get a subsidy?

Generally no, with narrow exceptions for survivors of domestic abuse or spousal abandonment. The premium tax credit is denied to married-filing-separately filers in almost all cases. The MAGI-lowering levers don't change that; the filing-status disqualification is independent. If you and your spouse are filing separately for other reasons and both want marketplace subsidies, you'd need to refile jointly.

Does the self-employed health insurance deduction help if I have a spouse with employer coverage available?

Only if you couldn't reasonably get coverage through the spouse's employer. The IRS denies the line 17 deduction when affordable employer coverage is available to either spouse for self-coverage. The "family glitch" fix that took effect in 2023 specifically expanded what counts as affordable employer coverage at the family level for ACA subsidy eligibility — but the line 17 deduction has always tested affordability at the employee-only level. The two interact in ways worth running by a tax preparer if your situation has both an employer plan offer and self-employment income.

The Bottom Line

The 2026 cliff makes MAGI granularity matter again. Under the enhanced ARPA rules, missing the threshold by a few thousand dollars cost you a slice of subsidy; now it costs you all of it. The legal levers — HSA, traditional 401(k), traditional IRA, self-employed retirement and health insurance deductions, timing of capital gains and Roth conversions — exist to give filers room to land where they intended to land. For households near 400% FPL the marginal value of a dollar of deductible contribution is dramatically higher than for households at the middle of the range.

Project your year-end MAGI now, not in March. Pull the levers in the order that gives you the most reduction per dollar of foregone liquidity, and rerun the subsidy calculator with each option to see exactly what each one saves.