To qualify for an Affordable Care Act Marketplace plan (commonly called Obamacare), you need to meet three basic requirements: you must live in the United States, you must be a U.S. citizen or lawfully present immigrant, and you cannot be currently incarcerated. Beyond that, your income determines whether you’ll get financial help paying for coverage and how much you’ll save.
Income Requirements and Financial Help
Your household income is the single biggest factor in determining what kind of coverage you qualify for and how much it costs. The system uses the federal poverty level (FPL) as its measuring stick, and where your income falls relative to that number shapes your options.
If your state has expanded Medicaid, you qualify for that program if your household income is below 138% of the FPL. For a single person, that’s roughly $22,000 a year based on 2026 poverty guidelines. For a family of four, it’s about $45,500. Medicaid coverage is free or very low cost.
If your income falls between 100% and 400% of the FPL, you’re eligible for premium tax credits that lower your monthly insurance bill on a Marketplace plan. For reference, 100% of the FPL for 2026 is $15,960 for an individual, $21,640 for a couple, $27,320 for a family of three, and $33,000 for a family of four. Add $5,680 for each additional family member beyond eight.
Through 2025, Congress temporarily removed the upper income cap, meaning even households earning above 400% of the FPL can receive premium tax credits if their insurance costs are high relative to income. This expansion is set to expire, so it’s worth checking current rules when you apply.
The Coverage Gap in Non-Expansion States
Ten states still haven’t expanded Medicaid, and this creates a real problem. If you live in one of those states and earn below 100% of the FPL, you may be caught in what’s called the “coverage gap.” Your income is too high for your state’s traditional Medicaid program but too low to qualify for Marketplace subsidies, which start at 100% of the FPL. If you’re in this situation, check whether your state offers any alternative programs or whether a change in income could push you into subsidy eligibility.
Citizenship and Immigration Status
U.S. citizens qualify automatically on the residency front. If you’re not a citizen, you can still enroll in Marketplace coverage as long as you’re “lawfully present” in the United States. That term covers a wide range of immigration statuses: green card holders, refugees, asylees, people with Temporary Protected Status, holders of valid non-immigrant visas, victims of trafficking, Cuban and Haitian entrants, and people paroled into the U.S. for at least one year, among others.
Members of federally recognized Indian tribes and citizens of the Marshall Islands, Micronesia, and Palau living in a U.S. state or territory also qualify. If you have a qualified non-citizen immigration status, you may also be eligible for Medicaid or CHIP, depending on your state’s income and residency rules.
Undocumented immigrants are not eligible for Marketplace plans or premium tax credits.
What If You Have Employer Coverage?
Having access to health insurance through your job doesn’t automatically disqualify you from the Marketplace, but it does affect whether you can get financial help. A job-based plan is considered “affordable” in 2026 if your share of the monthly premium for the cheapest available plan is less than 9.96% of your household income. If your employer plan meets that threshold, you won’t qualify for premium tax credits on a Marketplace plan.
Here’s where it gets important for families. Until recently, affordability was measured only by the cost of covering the employee alone, not the whole family. That left many spouses and children stuck with expensive family premiums and no access to subsidies. A rule change fixed this so-called “family glitch.” Now, if the cost of family coverage through your employer exceeds the affordability threshold, your dependents can qualify for premium tax credits on a Marketplace plan, even if the employee-only coverage is considered affordable.
When You Can Enroll
Open Enrollment is the main window for signing up, typically running from November 1 through January 15 each year (though some states extend the deadline). Outside of that window, you can only enroll if you experience a qualifying life event that triggers a Special Enrollment Period.
Common qualifying events include:
- Losing other health coverage (from a job, Medicaid, or a parent’s plan)
- Moving to a new state or county
- Getting married
- Having or adopting a baby
- Gaining a new immigration status
Less common situations also qualify. If you’re affected by a federally declared natural disaster, you get 60 days from the end of the FEMA-designated incident period to enroll. Survivors of domestic abuse or spousal abandonment get a 60-day enrollment window. If you were previously in the coverage gap in a non-expansion state and your income increased or you moved, making you newly eligible for subsidies, you have 60 days to enroll. Court-ordered coverage for a dependent triggers a Special Enrollment Period too, and coverage can be backdated to the effective date of the court order.
If you applied during Open Enrollment and were told you might qualify for Medicaid, but your state later determined you didn’t, you also get a Special Enrollment Period even though the original window has closed.
Documents You’ll Need to Apply
The Marketplace application asks for income, identity, and residency information. Having the right documents ready speeds up the process considerably.
For income verification, your most recent tax return or W-2s work if your income hasn’t changed. If you started a new job, send recent pay stubs from that job rather than documents from your previous employer. If you expect your income to change during the coverage year, you can provide pay stubs, a letter from an employer about new wages, or documentation showing when contract work will end.
You’ll also need to verify citizenship or immigration status. The specific documents vary based on your situation, and the Marketplace will tell you exactly what’s needed after you submit your application. You get at least 90 days from the date of your eligibility notice to provide any requested documentation. For citizenship and immigration verification, the deadline extends to 95 days. If you miss these deadlines, your plan could be changed or terminated.
How Your Subsidy Amount Is Calculated
When you complete your Marketplace application, the system estimates your premium tax credit based on the household income and family size you report. This credit is applied directly to your monthly premium, so you pay less out of pocket each month rather than waiting for a tax refund.
The credit amount is tied to the cost of a mid-level “Silver” plan in your area. If your income is lower, the credit covers a larger share of the premium. You can apply the credit to any metal-level plan (Bronze, Silver, Gold, or Platinum), but choosing a less expensive Bronze plan could mean you pay very little or nothing after the credit is applied. Choosing a more expensive plan means you pay the difference.
If your actual income at tax time turns out to be different from what you estimated, you’ll reconcile the difference on your tax return. Overestimating your income means a larger refund. Underestimating could mean you owe money back. Reporting income changes to the Marketplace during the year helps keep your credit amount accurate and avoids surprises at tax time.