ACA Open Enrollment 2027: Dates, Deadlines and Checklist

Answer first: For states using HealthCare.gov, ACA Open Enrollment for 2027 coverage starts November 1, 2026 and ends January 15, 2027. Enroll or change plans by December 15, 2026 for coverage that can begin January 1, assuming you pay the first premium. State-based Marketplaces may use different deadlines, so confirm the dates shown by your state.

Open Enrollment is more than a renewal button. Premiums, provider networks, prescription lists, deductibles and expected household income can change from one year to the next. A plan that worked in 2026 may not be the best-value choice for 2027—even if the monthly premium looks similar.

This guide uses the official federal Marketplace timeline and focuses on the decisions consumers can control: updating the application, comparing total costs, checking doctors and prescriptions, estimating the premium tax credit carefully and completing payment before coverage begins.

Official 2027 HealthCare.gov Enrollment Dates

The HealthCare.gov dates and deadlines page lists the following federal Marketplace timeline:

These are HealthCare.gov dates. Several states and the District of Columbia run their own Marketplaces and may extend or modify deadlines. Start from HealthCare.gov; it will direct you to the correct state Marketplace when necessary.

Who Should Review or Apply During Open Enrollment?

Use Open Enrollment if you need individual or family coverage and do not have an affordable option through an employer, Medicare or another program. Existing Marketplace members should actively review their information and plan choices. New applicants can compare available plans after creating or updating an application.

Marketplace coverage is different from Medicare Open Enrollment. People eligible for Medicare should use Medicare’s rules and plan-comparison tools instead of enrolling in a Marketplace plan as a replacement. See our Medicare Open Enrollment 2027 guide for the separate October 15–December 7 period.

Update Income and Household Information Before Comparing Prices

The premium tax credit shown by the Marketplace depends on application information. Review expected 2027 household income, the people included in the tax household, address, access to employer coverage and expected tax-filing status. Use a good-faith annual estimate based on known wages, self-employment income, unemployment compensation, retirement income and other amounts the application requests.

Do not simply copy one month of income when earnings are seasonal or irregular. Build a full-year estimate and keep supporting records. If circumstances change during 2027, update the Marketplace promptly. This can reduce the risk of receiving too much or too little advance premium tax credit.

Advance premium tax credits are reconciled on the federal return using Form 8962 and information from Form 1095-A. The IRS premium tax credit guidance explains the tax process. Our income tax calculator can help with general tax planning, but it does not replace the Marketplace’s eligibility calculation or Form 8962.

How to Compare 2027 Plans Beyond the Premium

The displayed monthly premium is only one part of health-care cost. Compare these items for every realistic plan:

• Net monthly premium: the amount after any advance premium tax credit, not only the full list price.
• Deductible: how much covered care may cost before the plan begins paying under its rules.
• Copays and coinsurance: what you pay for office visits, tests, specialists, urgent care and hospital services.
• Out-of-pocket maximum: the annual ceiling for covered in-network cost sharing; premiums and many non-covered costs are generally separate.
• Provider network: whether your doctors, hospitals, laboratories and preferred facilities participate in the exact plan—not merely with the same insurance company.
• Prescription formulary: whether each medicine is covered, its tier, prior-authorization rule and preferred pharmacy.

A healthy person may value a lower premium, while someone expecting surgery, pregnancy care, specialist visits or costly prescriptions may care more about the deductible, network and maximum exposure. Compare a low-use scenario and a high-use scenario rather than assuming the cheapest premium wins.

Check Whether the Plan Is HSA-Eligible

Not every high-deductible plan is eligible for Health Savings Account contributions. The plan should explicitly identify its HSA eligibility. If you want to contribute in 2027, verify the plan status and then check the IRS contribution rules for that tax year.

HSA eligibility can be affected by other coverage, including certain health flexible spending arrangements. Read our HSA account and investing guide for the mechanics, but use current IRS limits before making a contribution.

Documents to Gather Before November 1

• Names, dates of birth and Social Security numbers or document information requested for applicants.
• Recent pay records and a full-year 2027 income estimate for the tax household.
• Details of available employer coverage, including the employee premium and household offer.
• Current doctors, hospitals, pharmacies and prescription names.
• The current Marketplace plan notice and latest premium amount.
• Login access, updated contact information and a payment method for the first premium.

Keep the application confirmation, eligibility notice, plan selection and payment receipt. Marketplace enrollment and insurer payment are related but separate steps; selecting a plan does not eliminate the need to pay the first premium by the insurer’s deadline.

Special Enrollment, Medicaid and CHIP

Outside Open Enrollment, certain life events can create a Special Enrollment Period. HealthCare.gov gives examples including loss of other coverage, moving, marriage and the birth of a baby. Eligibility and timing depend on the event, so submit the requested evidence promptly.

Medicaid and the Children’s Health Insurance Program accept applications throughout the year for eligible households. If the Marketplace application indicates possible eligibility, follow the state agency’s instructions rather than waiting for the next annual window.

A Five-Step Enrollment Decision

1. Update the application: correct household, income, address and coverage information.
2. Confirm the deadline: use the federal or state Marketplace date that applies to you.
3. Shortlist plans: compare premium, deductible, maximum exposure, network and prescriptions.
4. Stress-test the budget: include the monthly premium plus routine and possible high-use costs in the household budget calculator.
5. Finish enrollment: save the confirmation and pay the first premium directly as instructed by the insurer.

Frequently Asked Questions