ACA Open Enrollment Checklist: What to Do Before You Enroll

Key Dates and Deadlines

For HealthCare.gov states, open enrollment typically runs from November 1 through January 15. Plans selected by December 15 usually take effect January 1. Plans selected between December 16 and January 15 take effect February 1. Some state-based marketplaces (California, New York, Massachusetts, and others) have their own deadlines that may extend into January or beyond.

Mark these dates on your calendar well in advance. The earliest shoppers often have the smoothest experience, HealthCare.gov traffic peaks in the final days before the December 15 deadline, and wait times for phone support or navigator appointments can stretch to hours.

Documents You Need to Gather

Before you start the enrollment process, assemble these documents for every household member who will be on the plan:

• Social Security numbers for all applicants (or immigration document numbers for lawfully present non-citizens).
• Most recent tax return (Form 1040) - the Marketplace uses your projected income to calculate your Premium Tax Credit.
• Recent pay stubs or income documentation - especially important if your income has changed since your last tax filing.
• Employer coverage details - if your employer offers insurance, you will need the plan cost and coverage information to determine if you qualify for Marketplace subsidies.
• Current health insurance policy numbers - to ensure continuity and avoid coverage gaps.
• List of doctors, specialists, and prescriptions - to verify they are covered by the plans you are considering.

Estimate Your Income and Subsidy

Your Premium Tax Credit is anchored to two numbers: your projected household income as a percentage of the Federal Poverty Level, and the benchmark Silver plan premium in your county. Getting your income estimate right is critical, overestimate and you leave subsidy money on the table; underestimate and you may owe money back at tax time.

Use our county premium data to find the average Silver plan cost in your area. Then check our subsidy guide to understand how income thresholds translate into credit amounts. If your income is near the 400% FPL cutoff, even small adjustments (retirement contributions, HSA deposits) can mean the difference between thousands in subsidies and zero assistance.

Compare Plans Beyond the Premium

Monthly premium is the number that grabs your attention, but it is only one piece of total annual cost. Before selecting a plan, compare these elements across Bronze, Silver, and Gold options:

• Deductible - the amount you pay before insurance kicks in. Bronze deductibles can reach $9,000+; Gold deductibles are often under $1,500.
• Out-of-pocket maximum - the most you will pay in a year. This is your downside protection ceiling.
• Copays and coinsurance - what you pay per doctor visit, specialist, lab test, or prescription after meeting the deductible.
• Network - HMO, PPO, or EPO. Confirm your preferred doctors and hospitals are in-network. Out-of-network care may not be covered at all.
• Formulary - check that your prescriptions are on the plan's drug list at an affordable tier.

Our metal level guide walks through the total annual cost calculation that helps you choose the right tier for your health usage pattern.

Check Issuer Competition in Your County

The number of insurance carriers competing in your county directly affects your options and pricing. Counties with only one or two issuers typically have higher premiums and fewer plan designs. Counties with five or more issuers often offer a wider range of price points and network options.

Browse our issuer profiles to see which carriers serve your area, their average premiums, and the plan types they offer. If your county has limited competition, you may want to check whether a neighboring county (if you are willing to establish residency) has better options.

Special Enrollment Periods

If you miss open enrollment, you may still qualify for a special enrollment period (SEP) triggered by a qualifying life event. Common qualifying events include:

• Loss of existing coverage - job loss, aging off a parent's plan, losing Medicaid eligibility.
• Marriage or divorce.
• Having a baby or adopting a child.
• Moving to a new county or state where different plans are available.
• Changes in household income that affect Medicaid eligibility.

You generally have 60 days from the qualifying event to select a new plan. Report the event to the Marketplace promptly, the clock starts whether you report it or not.