COBRA: What It Really Costs to Keep Your Health Insurance After a Job Ends
Losing a job is stressful enough without also losing health coverage mid-treatment or mid-pregnancy, and COBRA exists specifically to close that gap. It guarantees continuity of your exact plan, but the price tag, now covering the portion your employer used to quietly absorb, catches nearly everyone off guard the first time they see the bill, which is why comparing it against real alternatives before electing is worth the extra hour of homework.
The core principle
COBRA, the Consolidated Omnibus Budget Reconciliation Act, requires most employers with 20 or more employees to let departing workers, and their covered dependents, continue the exact same group health plan for a limited period after coverage would otherwise end, typically 18 months for a standard job loss, and up to 36 months for certain other qualifying events like divorce or a dependent aging out of eligibility. The plan design, network, and formulary all stay identical to what you had as an active employee.
The catch is entirely financial. Under COBRA, you pay the full premium, meaning both the portion you previously paid through payroll deduction and the portion your employer was contributing on your behalf, plus the law allows the plan to add an administrative fee of up to 2% of the total premium. Because most employers subsidize a substantial share of the premium for active employees, often 70% to 80% of the total cost, the jump from an employee's payroll deduction to the full COBRA premium is frequently far larger than departing employees expect.
Eligibility hinges on a qualifying event, a defined list that includes voluntary or involuntary job termination for reasons other than gross misconduct, a reduction in hours that drops an employee below the plan's eligibility threshold, divorce or legal separation from a covered employee, a covered employee's death, and a dependent child aging out of eligibility under the plan's terms. Each qualifying event carries its own maximum coverage period and its own notification deadlines, and the employer or plan administrator is generally required to send a formal COBRA election notice once the qualifying event is reported, starting the clock on the 60-day election window.
How the math works
Example 1: the jump from payroll deduction to full premium. While employed, an employee paid $150 a month toward their family health premium through payroll deduction, while the employer contributed the remaining $500, for a true total plan cost of $650 a month. Under COBRA, the full $650 becomes the employee's responsibility, plus a 2% administrative fee of $650 × 0.02, or $13, for a total monthly COBRA premium of $663. That is an increase of $663 minus $150, or $513 a month, from what the same person paid as an active employee, for identical coverage.
Example 2: the 18-month total, and comparing it to a marketplace alternative. Over the full 18-month maximum COBRA period, that $663 monthly premium totals $663 × 18, or approximately $11,934. Suppose the same household qualifies for a marketplace plan with comparable, though not identical, coverage at a net premium of $420 a month after an income-based subsidy, since job loss often reduces household income enough to qualify for meaningful marketplace assistance. Over the same 18 months, that totals $420 × 18, or $7,560, a savings of roughly $4,374 compared to COBRA, though the marketplace plan may carry a different network or deductible that needs to be weighed against the savings, not just the price.
Example 3: the retroactive election feature in practice. Suppose the same household waits until day 55 of their 60-day window to elect COBRA, having incurred a $3,200 emergency room visit on day 20, before coverage was formally elected. Because COBRA elections apply retroactively to the date the prior coverage ended, the plan is required to process that earlier claim as though coverage had never lapsed, provided the household also pays the back premiums covering that gap. In this example, electing on day 55 requires paying for all 55 days of retroactive coverage, roughly $663 × (55/30), or about $1,215, but it converts what would otherwise have been an uninsured $3,200 bill into a claim processed under the plan's normal cost-sharing terms, illustrating why the 60-day window is valuable even for someone who is unsure whether they will ultimately need the coverage.
How it shows up in real portfolios
Someone mid-treatment for a serious condition, with a specific specialist or hospital system in-network under their current plan, often has a strong practical reason to choose COBRA despite the higher cost, since it guarantees continuity of care with the exact same providers and formulary without the risk of a marketplace plan using a narrower network. This consideration can outweigh a meaningful cost difference when an ongoing treatment relationship, a course of chemotherapy or a specialist managing a chronic condition, would otherwise need to restart with a new provider mid-course.
A healthy household between jobs with no ongoing treatment relationships is usually the clearest case for comparing options seriously rather than defaulting to COBRA, since a marketplace plan, especially with an income-based subsidy triggered by the temporary income drop, frequently costs meaningfully less for equivalent or adequate coverage over the gap period. Because marketplace subsidy eligibility is based on estimated annual household income, a job loss partway through the year can qualify a household for a subsidy level that would not have applied at their prior full-year income, making the marketplace option more attractive specifically because of, not despite, the job change.
A high-earning professional negotiating a severance package should treat employer-paid COBRA continuation, sometimes offered for three, six, or more months as part of a severance agreement, as a real, quantifiable component of the package's total value, not an afterthought, since at several hundred dollars a month in avoided premium it can be worth thousands of dollars over a typical severance period.
A self-employed professional transitioning between a W-2 role and independent practice, say a physician leaving a hospital employment contract to open a private practice, often uses COBRA deliberately as a short bridge of a few months, accepting the higher premium in exchange for zero disruption to ongoing patient care relationships and prescription continuity, while a permanent individual market or small-group plan for the new practice is set up in parallel.
Actionable breakdown
- Coverage can last up to 18 months after a standard job loss.
- You pay the full premium plus up to a 2% administrative fee.
- You generally have 60 days to elect COBRA after coverage ends.
- Once elected, coverage applies retroactively with no treatment gap.
- Marketplace plans may offer income-based subsidies COBRA does not.
- A spouse's employer plan is often cheaper than COBRA.
- Compare total 18-month cost, not just the monthly premium, before deciding.
- Confirm your qualifying event is properly reported to the plan administrator.
Common pitfalls
- Defaulting to COBRA automatically without comparing marketplace plan costs, which can be significantly cheaper once an income-based subsidy is applied.
- Missing the 60-day election window and losing the option entirely, since there is generally no exception for simply forgetting.
- Forgetting COBRA is temporary. Failing to plan for what happens once the 18 or 36 month window ends can create a second, avoidable coverage gap.
- Overlooking a negotiated severance benefit that might already be covering some or all of the COBRA premium for a set period, and not confirming exactly how long that subsidy lasts.
- Assuming a qualifying event automatically triggers coverage. COBRA rights depend on properly reporting the qualifying event to the plan administrator within the required timeframe, a step that is sometimes missed during a stressful life transition like a divorce.
- Paying full COBRA premiums when a marketplace subsidy would apply. Many people never check their new, lower estimated income against current subsidy thresholds before defaulting to COBRA.
Related concepts
See health savings account and high deductible health plan for how a marketplace alternative to COBRA might be structured, and deductible for a key term to compare across plan options. Our insurance guide covers the broader landscape of coverage decisions around a job transition.
The bottom line
COBRA guarantees continuity of your exact plan, but it is rarely the cheapest option, so run the real comparison against marketplace coverage before your election window closes.