The Health Insurance Marketplace: How Applying and Enrolling Works

Who can use the Health Insurance Marketplace, how one application checks you for savings, Medicaid and CHIP, what every plan covers, and how to avoid scams.

iHealthBenefit · Last reviewed October 26, 2026 · 6 min read

If you don't get health coverage through a job, Medicare, Medicaid or another program, the Health Insurance Marketplace is where most people shop for an individual or family plan. It is also the only place to get the premium tax credit, the main federal help with monthly premiums.

In practice it follows a simple path: check that you can use it, fill out one application, see what you qualify for, pick a plan and pay the first premium. This guide walks through each step.

This is general information, not insurance, tax or legal advice. For help with your own situation, use the free Marketplace assisters described below, your state insurance department or a licensed professional.

Who can use the Marketplace

As of October 2026, HealthCare.gov says that to enroll in Marketplace coverage you must live in the United States, be a U.S. citizen or national (or be lawfully present), and not be incarcerated. A few groups fall outside those lines:

People who have Medicare can't enroll in a Marketplace health or dental plan, according to HealthCare.gov.
People who live in a U.S. territory can't get Marketplace coverage unless they also qualify as residents of one of the 50 states or Washington, DC, HealthCare.gov says.
Immigration rules for financial help are changing. HealthCare.gov warns that, due to a law change, starting January 1, 2027, only certain immigration statuses (lawful permanent residents, Cuban or Haitian entrants and Compact of Free Association migrants) qualify for savings. Other lawfully present immigrants may still buy Marketplace coverage, just without savings.

HealthCare.gov or your state's own site

The federal government runs the Marketplace at HealthCare.gov for most states, and some states run their own. You don't need to know which applies before you start: HealthCare.gov's 2026 "4 steps" page explains that when you create an account and enter basic information, it sends you to your state's site if your state runs its own Marketplace. The core ideas are the same everywhere, but a state-run Marketplace has its own website and phone number, so rely on the details it publishes for your state.

One application, several possible answers

The Marketplace application asks who is in your household and what you expect your household income to be for the year you want coverage. Based on that, you get eligibility results right away. HealthCare.gov's 2026 guidance lists the possibilities:

A Marketplace plan with savings, such as the premium tax credit to lower monthly premiums, or lower copayments, coinsurance and deductibles.
Free or low-cost coverage through Medicaid or the Children's Health Insurance Program (CHIP). If it looks like someone qualifies, the Marketplace sends their information to the state agency, which follows up about enrollment.
A Marketplace plan at full price, if you don't qualify for savings.

Two details matter more than most people expect. First, the household. HealthCare.gov's 2026 savings page says to count yourself, your spouse if you're married and everyone you'll claim as a tax dependent, including people who don't need coverage. Second, the income figure. As of 2026, HealthCare.gov and the IRS both describe it as modified adjusted gross income: your adjusted gross income plus any untaxed foreign income, nontaxable Social Security benefits and tax-exempt interest, not counting Supplemental Security Income. It is an estimate for the coming year, not last year's tax return, so a raise, a job loss or a new business should be built in.

HealthCare.gov's 2026 page on applying lists several ways to do it: online, by phone with the Marketplace Call Center, with a trained helper in your community, through an agent or broker, through an approved enrollment partner website, or with a paper application.

What every Marketplace plan covers

As of 2026, HealthCare.gov says every Marketplace plan covers 10 essential health benefits, including prescription drugs, emergency services, hospitalization, laboratory services, and mental health and substance use disorder services. Plans also include free preventive services when delivered by an in-network provider, and coverage for pre-existing conditions. A plan can't reject you, charge you more or refuse to pay for essential health benefits because of a condition you had before coverage started.

Prices are regulated too. HealthCare.gov's 2026 page on premiums says insurers can account for only five things when setting a Marketplace premium: where you live, your age, tobacco use, whether the plan covers just you or also dependents, and the plan category. It adds two limits that are worth knowing: premiums can be up to 3 times higher for older people than for younger ones, and tobacco users can be charged up to 50% more. Your health, medical history and sex can't affect what you pay. States can limit these factors further.

After you pick a plan

Enrollment isn't finished when you click a plan. HealthCare.gov's 2026 guidance says you pay monthly premiums directly to the insurance company, not to the Marketplace, and that your coverage won't start until you pay the first premium. You'll then get a packet with your insurance card.

From then on, keep your application current. If your income or household changes, HealthCare.gov's 2026 guidance says to update your application as soon as possible, because it can change your savings. This matters more than it used to: the IRS's Premium Tax Credit questions and answers (updated February 19, 2026) say that for tax years after 2025 there is no cap on paying back advance credit you weren't entitled to. If your income rises and you don't report it, the full difference comes off your refund or is added to what you owe.

You can end Marketplace coverage at any time, but HealthCare.gov's 2026 guidance warns that if you drop it without other coverage, you may have to wait for the next Open Enrollment to get back in unless a life event qualifies you for a Special Enrollment Period.

Steer clear of look-alike sites and scams

Health insurance scams are common enough that the Federal Trade Commission warned in a September 28, 2026 consumer alert that they pick up during Open Enrollment for Medicare and the Marketplace, and that scammers and dishonest businesses sometimes pay to appear at the top of search results. HealthCare.gov's 2026 fraud guidance adds several practical rules:

The Marketplace, its assisters and your state will never threaten you or ask for credit card information or payment to keep or qualify for coverage.
Don't give money, gift cards, cash or cryptocurrency to anyone claiming you must pay them to apply or keep coverage. You pay premiums to your plan.
Look for web addresses ending in ".gov," and be wary of social media ads offering cash or gifts.
Report suspected scams to the Federal Trade Commission, your local police and the Marketplace Call Center.

Where to get free, personal help

The Marketplace Call Center offers free help by phone, and HealthCare.gov's "Find Local Help" tool lists trained assisters (sometimes called navigators) who can sit down with you at no cost. For complaints about an insurer or agent, or questions about state rules, contact your state insurance department; the National Association of Insurance Commissioners keeps a directory of them. For tricky income questions, such as self-employment, a licensed tax professional can help.

Key takeaways

The Marketplace is the only place to get the premium tax credit; you need to live in the U.S., be a citizen, national or lawfully present, and not be incarcerated.
One application tells you whether you qualify for Marketplace savings, Medicaid or CHIP, based on your household and expected income for the coverage year.
Every Marketplace plan covers 10 essential health benefits and pre-existing conditions, and premiums can vary only by a handful of factors such as age, location and tobacco use.
Coverage starts only after you pay your first premium to the insurer, and income changes should be reported promptly because, starting with 2026, there's no cap on repaying excess advance credits.
Nobody legitimate will charge you to apply for or keep coverage; use .gov sites and free assisters.

Sources

Our articles are general information, not medical, insurance, tax or legal advice, and we don't sell insurance or recommend specific plans or companies.

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