Top Mistakes Floridians Make on HealthCare.gov — and How to Avoid Them

By the Florida Plan Finder Team · Licensed Florida Health Insurance Producer · NPN #21249133 · Last Updated: March 27, 2026

Florida has the largest ACA marketplace enrollment of any state, with over 3 million residents enrolled through HealthCare.gov. But enrollment volume does not mean enrollment quality — many Floridians make avoidable mistakes that cost them money, limit their care options, or create tax problems. Some of these mistakes are obvious in hindsight; others are subtle traps built into the system's design.

This guide identifies the most common and most costly mistakes Floridians make when enrolling in or managing their ACA marketplace coverage, and provides specific guidance on how to avoid each one.

Mistake #1: Relying on Auto-Renewal Without Reviewing Plans

If you don't actively make changes during Open Enrollment, HealthCare.gov automatically renews your current plan for the next year. This seems convenient, but it is one of the most expensive mistakes marketplace enrollees make.

Here is why auto-renewal is risky:

• Premiums change every year. Your plan's premium may increase by 5-20% or more. Meanwhile, a competing plan may have lowered its premium. Auto-renewal locks you into last year's choice at this year's (possibly higher) price.
• The benchmark Silver plan may change. Your subsidy is calculated based on the second-lowest-cost Silver plan (benchmark) in your county. If a different plan becomes the benchmark, your subsidy amount changes — and if your current plan is no longer the benchmark, you may pay more out of pocket even if the subsidy amount stays the same.
• Networks change. Carriers add and drop providers from their networks annually. Your doctor, specialist, or preferred hospital may no longer be in-network with your auto-renewed plan.
• Formularies change. Medications can be moved to higher tiers, removed from the formulary, or subjected to new prior authorization requirements.

Mistake #2: Estimating Income Incorrectly

Your income estimate on HealthCare.gov determines your premium tax credit (subsidy). If your estimate is wrong, you face financial consequences at tax time:

If you underestimate income: You receive too much subsidy during the year. When you file taxes and reconcile on Form 8962, you owe back the excess — potentially hundreds or thousands of dollars. Repayment caps exist for lower-income enrollees, but above 400% FPL, you owe back the entire excess with no cap.

If you overestimate income: You receive too little subsidy during the year. You get the difference back as a tax refund, but you've been paying unnecessarily high premiums all year — effectively giving the government an interest-free loan.

Common income estimation errors:

• Forgetting to include all income sources (gig work, side jobs, investment income, Social Security)
• Using gross income instead of Modified Adjusted Gross Income (MAGI)
• Not updating the estimate after a job change, raise, or loss of income
• Confusing household income with individual income (married couples must include both spouses' income)
• Forgetting that unemployment benefits count as income

Mistake #3: Choosing Bronze When You Qualify for CSR Silver

Cost-sharing reductions (CSR) are only available on Silver plans and only for enrollees with household income between 100% and 250% FPL. CSR dramatically reduces deductibles, copays, coinsurance, and out-of-pocket maximums — transforming a standard Silver plan into something resembling a Platinum plan.

The mistake: some enrollees see that a Bronze plan has a lower monthly premium and choose it without realizing that the CSR-enhanced Silver plan would save them far more in total costs.

A single ER visit on a Bronze plan could cost $5,000-$9,200 out of pocket. The same ER visit on a CSR Silver plan might cost $150-$500. The premium difference is minimal — the cost-sharing difference is massive.

Mistake #4: Not Checking Provider Networks Before Enrolling

Every marketplace plan has a provider network — the list of doctors, specialists, and hospitals that have contracted with the carrier to accept negotiated rates. Seeing an out-of-network provider (except in an emergency) typically means paying the full charge out of pocket, with no credit toward your deductible or out-of-pocket maximum.

The mistake: enrolling in a plan based solely on premium and metal tier without verifying that your doctors and preferred hospitals are in-network. This is especially common among enrollees who auto-renew and don't realize their provider has been dropped from the network for the new year.

The Fix: Before enrolling in any plan, search the carrier's online provider directory for your primary care physician, any specialists you see regularly, and your preferred hospitals. Call the provider's office to confirm they accept the specific plan (not just the carrier). Do this every year — networks change annually.

Mistake #5: Missing Open Enrollment Deadlines

Open Enrollment for HealthCare.gov runs from November 1 through January 15. The key sub-deadlines:

• December 15: Deadline to enroll or change plans for coverage starting January 1.
• January 15: Final deadline to enroll or change plans for coverage starting February 1.

If you miss both deadlines, you cannot enroll in a marketplace plan until the next Open Enrollment — a gap of up to 10 months — unless you experience a qualifying life event. During this gap, you are uninsured (or stuck with your current plan if auto-renewed).

The Fix: Set calendar reminders for November 1 (OE opens) and December 10 (5 days before the January 1 coverage deadline). Don't wait until the last day — HealthCare.gov experiences heavy traffic and technical issues near deadlines.

Mistake #6: Not Reporting Life Changes During the Year

Certain life changes during the year affect your marketplace coverage or subsidy and must be reported:

• Income changes (raise, job loss, new job, starting/stopping self-employment)
• Marriage or divorce
• Birth or adoption of a child
• Moving to a new address (especially a new county)
• Gaining or losing other health coverage (employer plan, Medicaid, Medicare)
• Change in household size

Failing to report these changes can result in incorrect subsidy amounts, tax reconciliation problems, or missed Special Enrollment Periods that would have allowed you to change plans.

Mistake #7: Ignoring the Summary of Benefits and Coverage

Every marketplace plan is required to provide a Summary of Benefits and Coverage (SBC) — a standardized document that outlines what the plan covers, what it costs, and how cost-sharing works. The SBC uses a consistent format across all carriers, making it easy to compare plans side by side.

The mistake: choosing a plan based only on the monthly premium displayed on HealthCare.gov without reading the SBC. The premium is just one cost — deductible, copays, coinsurance, out-of-pocket maximum, formulary coverage, and network breadth all affect your total annual cost of care.

The Fix: For each plan you're considering, download and read the SBC. Pay particular attention to the coverage examples provided (which show estimated costs for common scenarios like having a baby or managing diabetes). Compare the total estimated annual cost — premium + expected out-of-pocket — not just the monthly premium.

Mistake #8: Forgetting to Reconcile at Tax Time

If you received advance premium tax credits (APTC) during the year, you must file a federal tax return and complete Form 8962 (Premium Tax Credit) to reconcile the advance payments with your actual income. This is true even if your income is low enough that you would not otherwise be required to file.

If you don't file and reconcile, several consequences follow: the IRS may reduce or deny your APTC for the following year, you may not receive any additional credit you're owed (if you overestimated income), and you could face collection actions for excess APTC if you underestimated income.

Mistake #9: Not Using a Licensed Agent (It's Free)

Many Floridians don't realize that licensed health insurance agents can help them enroll in marketplace plans at no cost. Agents are paid by the insurance carrier — not by the consumer — and cannot charge you a fee. A good agent can help you compare plans, check provider networks and formularies, estimate your subsidy, and avoid the mistakes described in this guide.

Using an agent does not change your premium or subsidy — you pay the same amount whether you enroll directly on HealthCare.gov or through an agent. The agent simply provides guidance and support throughout the process.