What Is the Health Insurance Marketplace and How Does It Work

The Health Insurance Marketplace is the government-run platform, created under the Affordable Care Act, where individuals and families shop for private health insurance, compare standardized plans, and apply for income-based help paying premiums. Every plan sold through it must cover the same ten categories of essential benefits, and every application checks at once whether you qualify for Marketplace subsidies, cost-sharing reductions, or Medicaid. For the 2026 plan year, the rules around who gets financial help and what happens if your income estimate is off have tightened in ways worth understanding before you enroll.

How the Platform Is Run

Every state has a Marketplace, but not every state runs its own. For 2026, 30 states use the federal platform at HealthCare.gov, and 20 states plus the District of Columbia operate their own enrollment websites.¹ If your state runs its own exchange, HealthCare.gov redirects you there.

Every Marketplace plan must cover ten categories of essential health benefits: outpatient care, emergency services, hospitalization, maternity and newborn care, mental health and substance use treatment, prescription drugs, rehabilitative services, lab work, preventive and chronic disease care, and pediatric services including dental and vision for children.² Insurers can’t drop a category, though specific services within a category vary slightly by state.

Premiums come down to five things: your age, where you live, whether you use tobacco, which plan tier you pick, and whether you’re covering dependents. Insurers cannot charge more based on health history, sex, or pre-existing conditions, and treatment for pre-existing conditions is covered from day one.³ Every plan comes with a standardized Summary of Benefits and Coverage that presents deductibles, copays, and out-of-pocket limits in the same format across insurers so you can compare like against like.

Navigators, certified application counselors, and licensed brokers can walk you through the application and plan choices at no cost to you. Using one is usually worth the time if the options feel overwhelming.

Who Can Enroll

You can buy a Marketplace plan if you’re a U.S. citizen or a lawfully present immigrant and you live in the state where you’re applying.⁴ People incarcerated after a conviction are generally ineligible; those awaiting trial may still qualify. Employment isn’t required, and there’s no asset test. Only income matters when the Marketplace decides what kind of help you get.

Income is measured against the federal poverty level. For 2026, 100% of the FPL is $15,960 for a single person and $33,000 for a family of four in the 48 contiguous states, with higher thresholds in Alaska and Hawaii.⁵ Your household income and family size determine whether the same application routes you to Marketplace subsidies, cost-sharing reductions, or Medicaid.

What You’re Actually Choosing Between

Marketplace plans are grouped into four color-coded tiers that reflect how costs are split between you and the insurer. The tiers don’t indicate care quality or which doctors you can see — they’re purely about the cost-sharing math.⁶

Bronze

Lowest premiums, highest out-of-pocket costs. The insurer covers roughly 60% on average. Deductibles tend to be steep, so you pay full price for most services until you meet the deductible. Preventive care is still covered at no cost. These plans work best if you rarely need care and mainly want protection against a major event.

Silver

Roughly a 70/30 split with moderate deductibles. Silver is the only tier that qualifies for cost-sharing reductions, which for lower-income enrollees can push the effective coverage close to Gold or Platinum territory.

Gold

About 80% covered, with lower deductibles so insurance starts paying sooner. Premiums run higher than Bronze or Silver, but if you have a chronic condition or expect regular care, you often come out ahead on total annual spending.

Platinum

Highest premiums, roughly 90% covered, sometimes with deductibles near zero. Worth the math if you need frequent care. Platinum isn’t offered in every market.

Catastrophic

A separate option for people under 30, or older people who qualify for a hardship or affordability exemption.⁷ Very high deductibles, but preventive services and at least three primary care visits per year are covered before you meet the deductible.⁸ Premium tax credits cannot be applied to a Catastrophic plan.

Within any tier, plans also differ by network structure, which determines which doctors you can use and whether you need referrals.⁹

HMO: you pick a primary care doctor who coordinates care, referrals are usually required for specialists, and out-of-network care generally isn’t covered except in emergencies.
PPO: you can see any provider without a referral, and out-of-network care is partially covered.
EPO: no referrals needed, but out-of-network care isn’t covered except in emergencies.
POS: referrals required like an HMO, but out-of-network care is allowed at a higher cost.

If keeping a specific doctor matters, check the plan’s provider directory before enrolling. A cheaper premium means nothing if your providers aren’t in network.

Pediatric dental and vision are built into every plan, but adult dental and vision are not required benefits, and many plans skip them.¹⁰ You can buy a stand-alone dental plan through the Marketplace, but only alongside a health plan. Every Marketplace plan caps annual in-network out-of-pocket costs; for 2026 that cap is $10,600 for an individual and $21,200 for a family. Once you reach it, the plan pays 100% of covered services for the rest of the year.

When You Can Enroll

The Marketplace isn’t open year-round. Open Enrollment on HealthCare.gov runs from November 1 through January 15.¹¹ Pick a plan by December 15 and coverage starts January 1; enroll between December 16 and January 15 and coverage starts February 1. State-run exchanges sometimes set slightly different deadlines, so check your state’s site if you don’t use HealthCare.gov.

Outside Open Enrollment, you need a qualifying life event to trigger a Special Enrollment Period. The most common ones:

Losing existing coverage, such as an employer plan ending, aging off a parent’s policy, or losing Medicaid or CHIP.
Household changes: marriage, birth or adoption, divorce, or gaining a dependent through a court order.
Moving to an area with different plan options.
Becoming newly eligible for subsidies.

A qualifying event generally gives you 60 days to pick a plan, and you’ll need documentation such as a termination letter or marriage certificate.¹² Less common triggers include domestic violence, natural disasters that prevented timely enrollment, and errors made by a navigator or broker during application.

Financial Help and the 2026 Changes

The Marketplace offers two forms of financial help: premium tax credits and cost-sharing reductions. Both have shifted for 2026 in ways that can move real money.

Premium Tax Credits

Premium tax credits lower your monthly premium. The amount depends on your income, family size, and the cost of the benchmark Silver plan in your area. For 2026, you qualify if your household income is between 100% and 400% of the FPL, roughly $15,960 to $63,840 for a single person, or $33,000 to $132,000 for a family of four.¹³

This is a real change from 2021 through 2025, when Congress temporarily removed the 400% FPL cap so higher earners could also receive credits. That expansion has expired.¹⁴ If your 2026 income exceeds 400% of the FPL, you pay the full premium with no tax credit. If you received substantial subsidies in prior years at incomes above that threshold, budget for considerably higher premiums.

You can take the credit in advance, applied directly to your monthly bill, or claim it as a lump sum at tax time. Most people take it in advance. That creates a reconciliation obligation covered below.

Cost-Sharing Reductions

Cost-sharing reductions lower your deductible, copays, and out-of-pocket maximum. They’re only available with a Silver plan, and only if your income is between 100% and 250% of the FPL.¹³ At the lower end of that range, a Silver plan with reductions can perform more like a Gold or Platinum plan when you actually use care. This is why financial counselors often steer lower-income enrollees toward Silver even when a Bronze premium looks cheaper.

If You Have Access to Employer Coverage

Having access to an employer plan doesn’t disqualify you from buying Marketplace coverage, but it usually disqualifies you from subsidies. If your employer’s plan meets two tests, affordability and minimum value, you and your dependents can’t receive premium tax credits.¹⁵

For 2026, an employer plan is considered affordable if employee-only coverage costs no more than 9.96% of household income.¹⁶ Minimum value means the plan covers at least 60% of total healthcare costs on average. If the plan fails either test, you can shop the Marketplace and qualify for credits.

Under current rules, affordability for family members is measured against the family premium, not the employee-only premium. If the family premium exceeds 9.96% of household income, your spouse and dependents can qualify for Marketplace subsidies on their own, even if your self-only coverage is affordable.¹⁵

Tax Reconciliation at the End of the Year

Advance premium tax credits create a tax filing obligation that catches many people off guard. By late January, your Marketplace sends Form 1095-A showing what was paid in advance credits each month.¹⁷ You use it to complete Form 8962 with your federal return.¹⁸

Form 8962 compares what you received in advance to what you actually qualified for based on your real annual income. If income came in lower than estimated, you may get an additional credit. If it was higher, you owe the difference back.

Here 2026 hits harder than prior years. The repayment caps that previously limited how much excess credit had to be paid back have been eliminated. Starting with the 2026 plan year, you must repay the entire excess amount if your advance credits exceeded what you were entitled to.¹⁹ Under previous rules, a single filer earning under 200% of the FPL might have owed back only a few hundred dollars at most. That safety net is gone. If you get a raise, pick up freelance income, or see any other change push your income higher than expected, report it to the Marketplace right away so your advance credits can be adjusted mid-year. Waiting until tax time could mean a surprise bill of thousands.

Skipping Form 8962 isn’t an option either. If you don’t file it, the IRS blocks you from receiving advance credits or cost-sharing reductions the following year.¹⁸

If Your Income Is Below 100% of the FPL

The Marketplace was designed to work alongside Medicaid expansion, with people below 100% of the FPL going to Medicaid and those between 100% and 400% getting Marketplace subsidies. Because the Supreme Court made Medicaid expansion optional, a coverage gap exists in states that haven’t expanded. In those states, adults earning too much for traditional Medicaid but less than 100% of the FPL, under $15,960 for a single person in 2026, fall through: too little for Marketplace premium tax credits, too much for their state’s Medicaid.¹³ If you fall into that gap, you may qualify for a hardship exemption that lets you buy a Catastrophic plan through the Marketplace.⁷

1
Centers for Medicare & Medicaid Services. Marketplace 2026 Open Enrollment Period Report: National Snapshot
2
Centers for Medicare & Medicaid Services. Information on Essential Health Benefits (EHB) Benchmark Plans
3
HealthCare.gov. How Health Insurance Marketplace Plans Set Your Premiums
4
HealthCare.gov. Health Coverage for Immigrants
5
U.S. Department of Health and Human Services, ASPE. 2026 Poverty Guidelines: 48 Contiguous States
6
HealthCare.gov. Health Plan Categories: Bronze, Silver, Gold, and Platinum
7
HealthCare.gov. Health Coverage Exemptions: Forms and How to Apply
8
HealthCare.gov. Catastrophic Health Plans
9
HealthCare.gov. Health Insurance Plan and Network Types
10
HealthCare.gov. Dental Coverage in the Health Insurance Marketplace
11
HealthCare.gov. Enrollment Dates and Deadlines
12
HealthCare.gov. Special Enrollment Periods for Complex Issues
13
HealthCare.gov. Federal Poverty Level (FPL) – Glossary
14
Internal Revenue Service. Updates to Questions and Answers About the Premium Tax Credit
15
Centers for Medicare & Medicaid Services. Affordability of Employer Coverage for Family Members of Employees
16
Internal Revenue Service. Revenue Procedure 2025-25 – Indexing Adjustments for 2026
17
Internal Revenue Service. About Form 1095-A, Health Insurance Marketplace Statement
18
Internal Revenue Service. Reconciling Your Advance Payments of the Premium Tax Credit
19
CMS: Agent and Brokers FAQ. Are There Limits to How Much Excess Advance Payments of the Premium Tax Credit (APTC) Consumers Must Pay Back