COBRA vs the Marketplace: Covering the Gap to Medicare

You have worked toward early retirement for years. The date is set, the savings are in place, and the plan feels solid. Then someone mentions health insurance, and the room gets quieter. For Americans retiring before age 65, the gap between leaving employer coverage and becoming eligible for Medicare is one of the most consequential financial planning challenges of early retirement.

Two primary options exist to bridge that gap: COBRA continuation coverage and an ACA Marketplace plan. Both can provide comprehensive health insurance. But they differ meaningfully on cost, subsidy eligibility, provider access, and strategic flexibility. Understanding those differences before your last day of work can save you thousands of dollars and a good deal of stress.

This article walks through both options side by side, covering the factors that matter most for early retirees: premium costs, subsidy eligibility, provider networks, deductible timing, and the critical but often misunderstood rules around election windows and transitions between the two.

COBRA, which stands for the Consolidated Omnibus Budget Reconciliation Act, gives employees who lose job-based health coverage the right to continue that same coverage for a limited period. For most qualifying events, including voluntary retirement, the continuation period is 18 months. Certain other qualifying events can extend this to 36 months for dependents.

The appeal of COBRA is straightforward: you keep the exact plan you had. The same insurer, the same network of doctors and hospitals, the same formulary for prescriptions. For someone in the middle of ongoing treatment or managing a chronic condition with an established care team, that continuity has genuine value.

The catch is the cost. While you were employed, your employer likely paid a substantial share of your premium. According to the Kaiser Family Foundation's 2023 Employer Health Benefits Survey, employers covered an average of 83% of the premium for single coverage and 73% for family coverage. Under COBRA, you pay the entire premium yourself, plus an administrative fee of up to 2%. That shift can feel dramatic.

To illustrate the scale: if your employer plan cost $700 per month in total premium and your employer paid $580 of that, you paid $120. Under COBRA, your monthly cost becomes roughly $714. For a family plan with a $2,000 total monthly premium, the jump from a $400 employee share to a $2,040 COBRA payment is significant. These are illustrative figures - actual premiums vary widely by plan, insurer, and location.

Other practical points about COBRA worth knowing:

• You must be notified of your COBRA rights within 14 days of your plan administrator being informed of the qualifying event (DOL rules).
• You have 60 days from either the notice date or the date coverage ends, whichever is later, to elect COBRA.
• If you elect COBRA, coverage is retroactive to the date your employer coverage ended, so you can wait to see if you need care before committing.
• COBRA premiums are generally deductible as a medical expense if you itemize deductions and your total medical expenses exceed 7.5% of your adjusted gross income (IRS Publication 502).

The Health Insurance Marketplace, established under the Affordable Care Act (ACA), offers plans purchased directly rather than through an employer. Plans are standardized into metal tiers (Bronze, Silver, Gold, Platinum) that reflect the cost-sharing structure, and coverage must meet minimum essential coverage requirements under federal law.

For early retirees, the most important feature of Marketplace plans is something COBRA simply cannot offer: income-based subsidies. Premium Tax Credits are available to individuals and families whose income falls within certain ranges, and these credits can dramatically reduce monthly premiums.

For 2024 and 2025, enhanced subsidies introduced under the Inflation Reduction Act remain in effect. Under these provisions, individuals with income up to 150% of the Federal Poverty Level (FPL) may qualify for a $0 premium Silver plan, and meaningful credits extend well up the income scale. According to Healthcare.gov, the subsidy calculation is based on your Modified Adjusted Gross Income (MAGI) for the year, not your former salary.

This creates a meaningful opportunity for early retirees. If your retirement income in a given year is drawn primarily from sources that produce lower MAGI (such as Roth IRA withdrawals, which are not included in MAGI, or carefully managed traditional account distributions), your income may fall in a range that qualifies for substantial subsidies. A hypothetical couple aged 60, each in good health and drawing moderate income from retirement savings, could face a very different Marketplace premium than the sticker price suggests, depending on how their income is structured.

That said, income management in early retirement requires care. Our post on the ACA subsidy cliff and managing income before open enrollment covers how the subsidy structure works in detail and why MAGI planning matters significantly in the years before Medicare eligibility.

Beyond subsidies, other Marketplace considerations include:

• Network differences: Marketplace plans, particularly lower-cost options, may use narrower networks than your prior employer plan. Verifying that your preferred providers are in-network is an important step before enrolling.
• Plan variety: HMO, PPO, EPO, and POS structures are all available depending on your state and insurer. Network breadth and referral requirements vary by type.
• Cost-sharing reductions: Available on Silver plans for those below 250% FPL, these can lower deductibles and out-of-pocket maximums meaningfully.
• Open Enrollment Period: Runs from November 1 through January 15 in most states (dates vary by state-based exchanges). Outside of Open Enrollment, you need a qualifying life event to enrol.

Here is a detail that surprises many early retirees: leaving employer-sponsored coverage is a qualifying life event that opens a Special Enrollment Period (SEP) for the Marketplace. That SEP window is generally 60 days from the date of coverage loss - the same window you have to elect COBRA.

This means the two decisions happen in parallel, not sequentially. You are weighing both options at the same time, ideally before your last day of work.

What surprises people even more is what happens if they choose COBRA first. Many assume that electing COBRA locks them out of the Marketplace until the next Open Enrollment period. That is not accurate. Losing COBRA coverage - including voluntarily dropping it - is itself a qualifying life event that triggers a new 60-day SEP for the Marketplace, according to Healthcare.gov rules.

In practice, this means a common sequence some early retirees consider looks like this: elect COBRA to maintain coverage continuity while evaluating Marketplace options and finalizing income projections for the year. Then, if a Marketplace plan with subsidies turns out to be materially more affordable, voluntarily drop COBRA and enrol in a Marketplace plan through the new SEP. There are no penalties for this transition, though practical considerations apply.

One of those considerations is the deductible reset. Both Marketplace and COBRA deductibles typically follow a calendar year. If you switch plans mid-year, any out-of-pocket spending you have already made toward the current plan's deductible generally does not carry over to the new plan. Depending on your health needs and how far into the year the switch occurs, this reset may be financially significant. For someone who has already met a substantial portion of their deductible by mid-year, preserving COBRA for the remainder of that calendar year may reduce total out-of-pocket costs even if the Marketplace premium would otherwise be lower.

For those still in their earning years or thinking about how healthcare costs fit into the broader retirement picture, decisions made during this gap period can also interact with your longer-term tax planning. Our overview of how HSAs compare to FSAs as retirement wealth-building tools is worth reading for context on how pre-Medicare healthcare planning connects to the bigger picture.

Putting both options next to each other helps clarify the decision framework:

• Cost (premium): COBRA reflects the full employer plan premium plus up to 2% administrative fee, with no subsidy available. Marketplace premiums vary by plan tier and are reduced by Premium Tax Credits based on MAGI, potentially significantly.
• Subsidy eligibility: COBRA carries no eligibility for Premium Tax Credits or cost-sharing reductions. Marketplace plans may qualify for both, depending on income.
• Provider network: COBRA preserves your existing in-network providers exactly. Marketplace networks vary by plan; some mirror employer-style broad networks while others are narrower, particularly at lower price tiers.
• Deductible continuity: If you transition to COBRA without a break in coverage in the same calendar year, your prior year-to-date spending may apply toward the deductible (confirm with the insurer). Switching to a Marketplace plan mid-year generally resets the deductible.
• Coverage duration: COBRA lasts up to 18 months in most retirement scenarios. Marketplace plans renew annually with no inherent expiration, covering you through age 64 if needed.
• Enrollment timing: COBRA election window is 60 days from coverage loss. Marketplace SEP window is also 60 days from coverage loss; another SEP opens upon COBRA loss or voluntary termination.
• Flexibility: COBRA can be dropped at any time. Marketplace plans are harder to exit mid-year outside of qualifying events, though coverage can lapse if premiums go unpaid (with grace period rules applying).
• Administrative complexity: COBRA bills arrive from the employer or a third-party administrator. Marketplace enrollment is managed through Healthcare.gov or a state exchange, and subsidy reconciliation happens at tax time via Form 8962.

For early retirees bridging a longer gap to Medicare - particularly those who retire at 60 or earlier - the Marketplace's multi-year availability and potential for sustained subsidy savings over four or five years can represent a meaningful advantage over COBRA's 18-month ceiling. Once COBRA expires, the Marketplace remains available through a new SEP regardless.

For those retiring closer to 65, the calculus can shift. If you retire at 63 and a half, for example, COBRA's 18-month window might carry you almost to Medicare eligibility, depending on the timing. In that scenario, the network continuity and simplicity of COBRA could be particularly appealing if the premium difference after any potential Marketplace subsidy is modest.

It is also worth understanding the Medicare enrollment rules that apply at the end of this gap period. Missing your Initial Enrollment Period around age 65 can result in permanent late enrollment penalties for Medicare Part B and Part D. Our detailed breakdown of Medicare Part B and Part D late enrollment penalties is a useful companion read for anyone planning the handoff from private coverage to Medicare.

Importantly, if you are covered by COBRA when you turn 65, that does not automatically enrol you in Medicare. You need to enrol separately, and the rules around whether COBRA counts as "employer coverage" for the purposes of the Special Enrollment Period for Medicare are specific and worth confirming with the Social Security Administration (SSA.gov) or directly with Medicare (Medicare.gov).

The information in this article is provided for general educational purposes only and does not constitute personalised financial, tax, legal, or insurance advice. Health insurance rules, ACA subsidy structures, COBRA regulations, and Medicare enrollment requirements are complex and subject to change. A qualified financial adviser, licensed health insurance broker, or benefits specialist can help you evaluate your specific situation before making coverage decisions.