Selling your house usually does not count as income for Obamacare purposes, because a federal tax rule lets you exclude up to $250,000 of gain if you file singly and up to $500,000 if you file jointly. Stay inside those limits and your Marketplace subsidies are unaffected. Go above them and the excess flows straight into the income figure that determines your premium tax credits, which in 2026 can mean losing every dollar of assistance.
What the Marketplace Actually Counts
Premium tax credits are based on your Modified Adjusted Gross Income. MAGI starts with the Adjusted Gross Income on your federal return and adds back tax-exempt interest, non-taxable Social Security benefits, and any foreign earned income exclusion.1HealthCare.gov. What’s Included as Income
Taxable capital gains land inside AGI, which means they land inside MAGI. Gains the tax code excludes from gross income never enter AGI at all, so they never touch your subsidy calculation. The whole question of whether a home sale hurts your coverage comes down to how much of your gain is excluded and how much is taxable.
The Primary Residence Exclusion
Section 121 of the Internal Revenue Code lets you exclude gain from selling your main home if you owned and lived in it for at least two of the five years before the sale. The cap is $250,000 for single filers and $500,000 for joint filers.2Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence For the joint exclusion, both spouses have to meet the use requirement, but only one has to meet the ownership requirement.
If your gain fits inside the exclusion, it is invisible to the Marketplace. A single homeowner with a $200,000 gain reports nothing new, has the same MAGI, and keeps the same premium tax credits. Most home sales fall into this bucket.
When the Gain Exceeds the Exclusion
Only the amount above the exclusion is taxable. A single filer with a $350,000 gain has $100,000 that enters AGI and MAGI. That extra income can cut into your premium tax credits or eliminate them, and it can trigger the 3.8% Net Investment Income Tax if your MAGI passes $200,000 single or $250,000 joint. The NIIT applies only to the taxable slice; whatever Section 121 excludes is not subject to it.3Internal Revenue Service. Topic No. 559, Net Investment Income Tax
The subsidy hit often hurts more than the tax bill. Someone whose usual MAGI is $45,000 who adds $100,000 in taxable gain jumps to $145,000, and that jump can push them past subsidy eligibility entirely.
The 2026 Subsidy Cliff
For 2026 coverage, eligibility for premium tax credits is capped at 400% of the federal poverty level unless Congress enacts a pending extension of the enhanced subsidies that expired at the end of 2025.4Internal Revenue Service. Eligibility for the Premium Tax Credit Under current law, a single person with MAGI above roughly $62,600 loses all premium tax credits. For a household of four, the cutoff is approximately $128,600. One dollar over means repaying every dollar of advance credits received during the year.
Between 2021 and 2025, the enhanced subsidies removed this cliff. Those enhancements are not in effect for 2026 at the time of this writing. The House passed a three-year extension in January 2026, but it has not become law. If you are planning a sale, check where that bill stands before you assume the cliff still applies.
The cliff makes timing everything. If your normal income sits at 350% of poverty and a taxable gain lifts you above 400%, you do not lose a portion of your credits. You lose all of them, and you owe back whatever the Marketplace already paid on your behalf.
Cost-Sharing Reductions Can Disappear Sooner
If you carry a Silver plan, you may also be getting cost-sharing reductions that lower your deductible, copays, and out-of-pocket maximum. Those are available only between 100% and 250% of the federal poverty level, roughly $15,650 to $39,125 for a single person in 2026. A taxable home sale gain that would only nick your premium tax credits can wipe out cost-sharing reductions entirely, and those can be worth thousands in reduced out-of-pocket costs.
Selling Before Two Years
Sell before you have owned and lived in the home for two years and you normally get no exclusion. The tax code carves out an exception when the sale is driven by a job relocation, a health-related move, or certain unforeseen circumstances such as divorce, natural disaster, or death.2Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
The partial exclusion is prorated. Take the months you owned and lived in the home, divide by 24, and multiply by the full exclusion amount. A single seller who lived in the home 18 months before a qualifying job transfer gets 18/24 × $250,000 = $187,500.5Internal Revenue Service. Publication 523, Selling Your Home Anything above the prorated cap is taxable and enters MAGI.
Rentals and Second Homes Are Not Covered
Section 121 applies only to your primary residence. Sell a rental, a vacation home, or an investment property and the entire gain is taxable, and the entire gain feeds MAGI. Rentals also carry depreciation recapture: depreciation deductions you claimed (or were entitled to claim) get taxed at up to 25% when you sell, and the recaptured amount is not shielded even if you converted a former primary residence into a rental before the sale.6Internal Revenue Service. Property (Basis, Sale of Home, Etc.) 5
How to Calculate the Gain
Gain is not sale price minus purchase price. Your adjusted basis is the original purchase price plus the cost of capital improvements plus original closing costs, reduced by any casualty loss deductions you have already claimed. The gain is what you received from the sale, after selling expenses, minus that adjusted basis.7Internal Revenue Service. Property (Basis, Sale of Home, Etc.) 3
Capital improvements are additions that raise the home’s value, extend its life, or adapt it to a new use: a new roof, a kitchen remodel, an added bathroom. Routine repairs do not count. Bought for $300,000, spent $75,000 on improvements, paid $20,000 in selling costs, sold for $600,000? The basis is $375,000, selling costs reduce the amount realized, and the gain is roughly $205,000, well under the single-filer cap. Keep every improvement receipt. A higher basis is a lower gain, and a lower gain is a better chance of staying inside the exclusion.
Reporting the Sale to the Marketplace
If a home sale changes your expected annual income, tell the Marketplace within 30 days.8GovInfo. Report Life Changes When You Have Marketplace Coverage You can update your application through your HealthCare.gov account or by calling the Marketplace. If the 30 days have passed, report it anyway.9HealthCare.gov. Reporting Income, Household, and Other Changes
If the whole gain is excluded under Section 121, your MAGI has not changed and there is nothing to report. If any portion is taxable, update your income estimate right away. Waiting until tax time means collecting advance credits all year that you may not be entitled to.
The Marketplace may ask you to verify the change. Recent pay stubs, tax returns, or other records of expected annual income are accepted.10HealthCare.gov. Health Plan Required Documents and Deadlines For the sale itself, your closing statement and a record of your cost basis let you calculate the gain accurately. If depreciation, a partial exclusion, or multiple properties are in play, running the numbers with a tax professional before you update the Marketplace is worth the fee.
No Repayment Caps in 2026
In prior years, if your actual income came in higher than you estimated and you had received too much in advance premium tax credits, the IRS capped how much you had to repay. Those caps are gone for the 2026 tax year. If your advance credits exceed what you actually qualify for, you repay the full difference.11Internal Revenue Service. Updates to Questions and Answers About the Premium Tax Credit
Receive $8,000 in advance credits based on your normal income, then sell a home with a taxable gain that pushes you over the subsidy limit, and you owe back the entire $8,000 when you file. You reconcile all of this on IRS Form 8962, which compares the advance credits paid on your behalf against the credit your final MAGI actually earns.12Internal Revenue Service. About Form 8962, Premium Tax Credit Accurate income estimation matters more this year than it has in a long time.