Retirement
What Counts Toward Marketplace MAGI for Early Retirees
Taxable conversions, gains and municipal bond interest count toward ACA income. Cash and investment basis work differently. A 2026 example shows why tax room can mislead.
Marketplace modified adjusted gross income, or MAGI, starts with adjusted gross income and adds back untaxed Social Security, tax-exempt interest and excluded foreign income. Taxable Roth conversions and realized gains count. Spending existing cash or returning investment cost basis does not itself create income.
That distinction matters when you retire before Medicare and buy ACA coverage. The amount you spend and the income the Marketplace counts can be very different. A stock sale taxed at 0% can reduce your insurance savings; a larger withdrawal of cash may leave them alone.
MAGI helps determine eligibility and savings, but it does not set your insurance bill by itself. Household circumstances, available coverage and local plan prices also matter.
Start with AGI, before the standard deduction
HealthCare.gov defines Marketplace MAGI as:
AGI + non-taxable Social Security + tax-exempt interest + excluded foreign income.
AGI already reflects applicable income adjustments. The standard deduction comes later, when calculating taxable income, so it does not reduce Marketplace MAGI. Do not substitute the MAGI used for IRA eligibility: different tax provisions use different definitions.
This is a household calculation. Include your spouse's income and dependents' income when they are required to file a federal return, even if they do not need Marketplace coverage. Supplemental Security Income, or SSI, is excluded; ordinary Social Security benefits are counted in full.
What goes into the number?
Wages, net self-employment and rental income, taxable interest, dividends and realized capital gains generally enter AGI. Qualified dividends and long-term gains still count even when their federal income tax rate is 0%. Municipal bond interest enters through the tax-exempt-interest add-back.
Traditional retirement withdrawals and Roth conversions count to the extent they are taxable. A fully pretax IRA conversion enters income in full. If you have nondeductible IRA basis, part may be nontaxable under the allocation rules; use the taxable amount determined on Form 8606. The IRS conversion guidance distinguishes previously taxed money from untaxed amounts.
Money arriving in your checking account is not automatically income:
- Selling investments: an illustrative $50,000 stock sale with $40,000 of adjusted basis produces $10,000 of gain, not $50,000 of income. The IRS measures gains against adjusted basis; this assumes no other gains or losses affect the net result.
- Spending cash: drawing down existing savings is not income, although interest earned on those savings counts.
- Roth IRA withdrawals: qualified distributions and returns of regular contributions are excluded. Nonqualified earnings can be taxable. Withdrawing previously converted principal does not tax it again, but a separate five-year rule can trigger an early-distribution penalty. Follow the IRS ordering and distribution rules; do not treat the whole account as freely spendable.
- Loans and gifts: generally excluded. Borrowing still creates a debt to repay.
The useful planning distinction is between receiving money and recognizing income. Account choice changes that relationship.
Which year's poverty guideline applies?
Marketplace assistance compares coverage-year household income with a federal poverty guideline, often called FPL. For 2026 coverage, use the 2025 guideline, not the newly published 2026 amount. HealthCare.gov's table lists $15,650 for one person in the contiguous states and DC; Alaska and Hawaii have higher amounts.
Divide MAGI by the applicable guideline and multiply by 100. For this single-person household, $39,125 ÷ $15,650 × 100 = 250% of FPL.
Two kinds of assistance use that income measure:
Premium tax credits lower premiums. For 2026, income above 400% of FPL generally ends federal credit eligibility. Being below that ceiling does not guarantee a credit: other eligibility requirements and benchmark premiums still matter. At low incomes, Medicaid eligibility or a coverage gap may be relevant instead.
Cost-sharing reductions lower deductibles, copayments and other out-of-pocket costs for eligible people who enroll in a silver plan. Standard income-based tiers have boundaries at 150%, 200% and 250% of FPL. These are coverage benefits, separate from the premium credit reconciled on your tax return. Report income changes so the Marketplace can reassess eligibility.
Why tax-bracket room can give the wrong signal
Consider an illustrative single filer under 65 with 2026 coverage in California. They choose a 250% FPL income ceiling, or guardrail. Assume no other income, adjustments, itemized deductions or special tax treatment, and a fully taxable conversion:
| Income source | Amount |
|---|---|
| Part-time wages | $12,125 |
| Nonqualified dividends and taxable interest | $1,000 |
| Qualified dividends | $3,000 |
| Long-term capital gains | $15,000 |
| Planned Roth conversion | $8,000 |
| Marketplace MAGI | $39,125 |
Their guardrail is $15,650 × 2.5 = $39,125, leaving zero headroom.
Use the dollar ceiling when checking a boundary. At $39,126, the percentage still rounds to 250.0% to one decimal place, but income is already a dollar above the line.
Yet the federal tax calculation shows substantial room. Using the 2026 single standard deduction and capital-gains threshold, taxable income is $39,125 − $16,100 = $23,025. The 0% gains ceiling is $49,450, leaving $26,425 of additional gains capacity if the other inputs stay fixed.
The deduction creates tax room without creating MAGI room. Realizing another $1,000 of gains would remain inside that 0% federal bracket while raising MAGI to $40,125, or about 256.4% of FPL. That exceeds the chosen ceiling. A $1,000 fully taxable conversion raises MAGI by the same amount, though its income-tax treatment differs.
Zero headroom means no extra income fits this chosen guardrail. It does not establish that avoiding a conversion is best over a lifetime. Compare any lost assistance with the conversion's longer-term tax benefit and the actual plans available.
Leave room for the income you cannot schedule
Stoke's Roth Conversion & Capital Gains Headroom Planner reproduces this example and compares a selected MAGI guardrail with federal tax ceilings. It estimates income headroom; it does not price insurance or calculate your premium tax credit. Its simplified inputs do not handle every AGI adjustment or IRA-basis allocation.
Estimate full-year income before selling or converting, including wages earned before retirement and expected fund distributions. Leave a buffer for uncertain income rather than aiming precisely at a boundary.
Update the Marketplace when the estimate changes. Advance premium credits are reconciled on Form 8962, and from tax year 2026 excess advances must be repaid in full, without the former repayment caps. Before using apparent tax room, check how much Marketplace income room you actually have.
This article provides general information, not individualized financial, tax, legal or investment advice. Confirm coverage-year rules and review consequential conversion or withdrawal decisions with a qualified professional.
How much room do you have for a conversion?
Try the Roth Conversion & Capital Gains Headroom Planner with your income and chosen tax and health insurance limits. It estimates headroom, not your final tax bill or insurance premium.
Open the headroom plannerKeep reading
- How to Retire Before 59½: 5 Ways to Access Your 401(k) and IRA EarlyA large retirement balance does not tell you what pays the bills before 59½. Compare five routes, then check the spending and tax bill your first five years must cover.
- The ACA Subsidy Cliff Is Back. Does It Raise Your FIRE Number?Crossing the 2026 income ceiling can erase thousands in health insurance credits. But dividing that loss by 4% can overstate what an early retiree needs.
- Beyond the 4% Rule: Bengen's 4.7%, Guardrails, and What Early Retirees Should UseA higher withdrawal rate can mean a different portfolio or a promise to cut spending. Before using either, translate the assumptions into years and budget lines.