Retiring Before 65? The Health Insurance Gap Could Be Your Most Expensive Retirement Mistake

Plenty of retirement calculators ask how much you have saved. Fewer ask what you will pay for health coverage between your last day on an employer plan and the first day Medicare starts.

That stretch is the pre-Medicare gap. Medicare, the federal health program for most people 65 and older and for some younger people with disabilities, does not turn on because you resigned. Leave work at 60 and you may need five years of private coverage. Leave at 62 and you still need about three.

Households also hit the gap earlier than they planned. The Employee Benefit Research Institute’s 2026 Retirement Confidence Survey found that nearly half of retirees left work ahead of schedule, and three in four of those early exits were for reasons outside their control, from health problems to company cuts. The median retirement age among retirees in the survey was 62. Three in five said they retired before 65.

KFF, the health-policy research organization formerly known as the Kaiser Family Foundation, notes that fewer employers still offer retiree health benefits before Medicare. In 2025, only 27 percent of large firms that offered health benefits also covered at least some employees under 65 after they left. For many households, the bridge is something you build yourself.

COBRA is usually the first option people hear. It is a federal right, under the Consolidated Omnibus Budget Reconciliation Act, to keep your former employer’s group health plan for a limited time after you leave, usually up to 18 months when the qualifying event is ending a job or cutting hours. The sticker shock is the price. The plan can charge up to 102 percent of the full premium, your share plus the employer share plus a small administrative fee.

Put that against KFF’s 2025 Employer Health Benefits Survey. Average annual premiums were about $9,325 for single coverage and $26,993 for family coverage. At the COBRA ceiling, that is roughly $9,500 a year for one person and about $27,500 for a family, before deductibles. Useful if you are mid-treatment, have already met a big deductible, or need a short bridge. Painful as a five-year plan.

You also get a clock. You generally have 60 days to elect COBRA after a qualifying event, and election can be retroactive. That window lets you compare Marketplace quotes before you lock in the expensive continuation. COBRA alone will not carry someone from age 60 to Medicare. After 18 months you still need another source.

The Affordable Care Act Marketplace is often the longer bridge. Plans sold through HealthCare.gov or a state exchange can cover you until Medicare, and premium tax credits can lower the bill when household income qualifies. Losing job-based coverage usually opens a special enrollment period, typically 60 days before or after the loss, so you are not stuck waiting for open enrollment.

Income management matters more in 2026. Enhanced premium tax credits that had softened costs for middle-income enrollees expired after 2025. The older subsidy cliff is back: households above 400 percent of the federal poverty level generally lose the premium tax credit entirely. KFF puts 401 percent of poverty for an individual in the contiguous United States near $62,800. Cross that line by a dollar and an older enrollee can jump from a subsidized payment to the full age-rated premium.

Age rating is why premiums jump in your 60s. Marketplace insurers may charge older adults up to three times what younger adults pay. KFF’s 2026 national averages for a 60-year-old, without subsidies, are about $11,625 a year for the lowest-cost bronze plan and about $15,914 for the benchmark silver plan. That is roughly $970 to $1,330 a month before deductibles.

Using the federal age-rating curve to scale those age-60 averages, an illustrative 62-year-old lands near $12,300 bronze and $16,850 silver. At 64, the same method points to about $12,850 bronze and $17,600 silver. Those are national sketches, not your ZIP code quote. Run HealthCare.gov with your county, tobacco status, and projected income before you treat any of them as a budget line.

A working spouse’s employer plan can still be the cheapest path. Under special enrollment rules tied to the Health Insurance Portability and Accountability Act, losing other coverage can let you join a spouse’s group plan outside open enrollment if you request it within 30 days. Ask HR for the dependent premium, network, and whether the plan treats you as a new enrollee mid-year. Dual-career diaspora households often assume this is automatic. It is not. Miss the 30-day window and you may wait until the next open enrollment while COBRA or Marketplace fills the hole.

A health savings account can soften the years before Medicare if you stay on a qualifying high-deductible plan. For 2026, the IRS set contribution limits at $4,400 for self-only coverage and $8,750 for family coverage, plus a $1,000 catch-up if you are 55 or older and not on Medicare. Money can grow tax-free and later pay qualified medical costs, including many Medicare premiums after you enroll. Stop contributing once Medicare starts. Part A can apply retroactively, so many savers pause deposits several months before they claim Social Security or Medicare to avoid excess-contribution penalties.

Watch the Medicare calendar as carefully as the premiums. COBRA is not active employer coverage for delaying Medicare Part B. If you turn 65 while on COBRA, waiting until COBRA ends to enroll in Part B can mean a coverage gap and a lifetime late-enrollment penalty. Your Initial Enrollment Period is a seven-month window around your 65th birthday. Put that date on the same spreadsheet as your bridge plan.

Before anyone resigns, price three years of coverage the boring way. List COBRA’s full premium, a Marketplace quote at your projected modified adjusted gross income, and a spouse-plan dependent rate if one exists. Add deductibles, not just premiums. Then put the total next to remittances, parent-care help, and retirement withdrawals in the Family Support Budget Calculator. The FIRE Number Calculator is more honest when health premiums sit in the annual spend, not in a footnote.

For the longer plan, keep First-Gen Retirement Planning Basics and Retirement Planning When Your Parents Did Not Have a 401(k) beside Retirement Savings Benchmarks for Second-Gen Professionals. If caregiving is what is pushing an early exit, read Caregiver Costs and Retirement Delay Benchmarks for Employed Adult Children. When parents hit 65 first, Medicare and Medicaid Paperwork Barriers for Limited-English Parents helps you practice the enrollment drill you will need yourself.

Leaving work before 65 can still be the right move. Just do not let the resignation letter outrun the insurance math. The expensive mistake is discovering the bridge price after the employer subsidy has already ended.