Health insurance through an employer works as a group plan your company sponsors and largely pays for: the employer picks the insurer and the menu of plans, covers most of the monthly premium, and deducts your share from your paycheck before taxes. You choose a plan during a set enrollment window, use it under federal rules that protect your eligibility and appeals rights, and keep it as long as you remain eligible under your employer’s terms. In 2025, the average annual premium for single coverage through an employer was $9,325, with the employer paying roughly 84% of it.
How the Premium Gets Split
The single biggest reason employer coverage is cheaper than buying your own policy is that your employer subsidizes it. According to the 2025 KFF Employer Health Benefits Survey, employers pay about 84% of the premium for single coverage and 74% for family coverage on average. In dollars, the average employee paid roughly $1,440 a year for single coverage and $6,850 a year for family coverage; the employer paid the rest.
Your share is normally taken out of your paycheck pre-tax through a Section 125 cafeteria plan, which means your premium contribution lowers the wages counted for federal income tax and for Social Security and Medicare tax.1Internal Revenue Service. FAQs for Government Entities Regarding Cafeteria Plans The employer’s contribution is not treated as taxable wages to you either.2Internal Revenue Service. Employee Benefits For someone in the 22% federal bracket also paying 7.65% in FICA, every $100 in pre-tax premium works out to about $30 in tax savings compared with paying the same amount after tax. Over a year, that’s real money.
The Plan Types You’ll Choose Between
Most employers offer at least two plan options at enrollment, and the label on each one tells you a lot about how it will behave when you use it.
- HMO (Health Maintenance Organization): You pick a primary care physician who coordinates care and refers you to specialists. Out-of-network care generally isn’t covered except in emergencies. Premiums and copays tend to run lower.
- PPO (Preferred Provider Organization): You can see any doctor or specialist without a referral. In-network providers cost less; out-of-network care is still partially covered. Premiums are usually higher.
- EPO (Exclusive Provider Organization): Like an HMO in that out-of-network care usually isn’t covered, but you typically don’t need referrals for specialists.
- POS (Point of Service): A hybrid. You choose a primary care physician and need referrals like an HMO, but can go out of network at a higher cost like a PPO.
- HDHP (High-Deductible Health Plan): Lower premium, higher deductible. For 2026, an HDHP must have a deductible of at least $1,700 for individual coverage or $3,400 for family, with out-of-pocket maximums capped at $8,500 and $17,000.3Internal Revenue Service. Revenue Procedure 2025-19
HDHPs are often paired with a Health Savings Account (HSA), a tax-advantaged account for medical expenses. For 2026, you can contribute up to $4,400 for self-only coverage or $8,750 for family coverage.3Internal Revenue Service. Revenue Procedure 2025-19 The account is yours: unspent funds roll over year to year, can be invested, and stay with you if you leave the job. To qualify, you must be enrolled in an HDHP, not covered by any other non-HDHP health plan, not enrolled in Medicare, and not claimed as someone else’s dependent. HSA contributions made through payroll get the same pre-tax treatment as your premium.
Which plan is right for you depends on how you actually use care. If you rarely see a doctor, a lower-premium HDHP with an HSA often comes out ahead. If you have ongoing prescriptions or expect surgery, a plan with a lower deductible and a higher premium usually costs less overall.
What You Pay When You Actually Use the Plan
Premiums are only part of the picture. When you get care, three other terms drive your bill:
- Deductible: what you pay before the plan starts covering services.
- Copay: a fixed amount per visit or prescription, like $25 for a doctor visit or $15 for a generic drug.
- Coinsurance: a percentage you pay after meeting the deductible. With 20% coinsurance on a $1,000 procedure, you pay $200 and the plan pays $800.
Every ACA-compliant plan caps your annual out-of-pocket costs. For 2026, the ceiling is $10,600 for an individual and $21,200 for a family.4HealthCare.gov. Out-of-Pocket Maximum/Limit Once you hit it, the plan pays 100% of covered services for the rest of the plan year.
Who’s Eligible, and When You Can Sign Up
Under the ACA, a full-time employee is anyone averaging at least 30 hours a week, or 130 hours a month, and large employers must offer coverage to workers meeting that threshold.5Internal Revenue Service. Identifying Full-Time Employees Employers with fewer than 50 full-time employees have no federal obligation to offer coverage at all, though many do. Rules for part-time and seasonal workers are up to the employer, as long as they’re applied consistently.
New hires usually face a waiting period before coverage begins. Federal law caps it at 90 days.6CMS. Affordable Care Act Implementation FAQs – Set 16 Some employers start you on day one; others use the full 90. Your offer letter or Summary Plan Description will spell out the timeline and give you an enrollment window, commonly 30 or 60 days from your start date. Miss it, and you generally wait for open enrollment.
Open enrollment is the main annual window, typically two to four weeks in the fall. During it, you can enroll for the first time, switch plans, add or drop dependents, or opt out. Some employers require you to actively re-enroll each year; others carry your current elections forward automatically.
Outside those windows, you can only make changes if a qualifying life event opens a special enrollment period. The most common ones include:7HealthCare.gov. Qualifying Life Event (QLE)
- Loss of other coverage, such as coming off a spouse’s plan, aging off a parent’s plan at 26, or losing Medicaid.
- Changes in household, including marriage, divorce, birth or adoption, or the death of a covered family member.
- A move to a new ZIP code or county where different plans are available.
You generally have 30 days from the event to notify your employer and make changes, and you’ll likely need documentation like a birth certificate or marriage license. Miss the deadline and you wait for open enrollment.
Adding a Spouse or Children
If your employer’s plan offers dependent coverage, the ACA requires it to cover your children until age 26, regardless of whether they’re married, live with you, are financially independent, or are in school.8U.S. Department of Labor. Young Adults and the Affordable Care Act Employers are not required to subsidize dependent premiums, though, and the cost jump when you add family is often steep: the KFF data shows the employee share of family coverage averages nearly five times the cost of employee-only.
Spousal coverage is where employer rules vary the most. Some plans cover spouses with no restrictions. Others use one of two cost-control mechanisms:
- Spousal surcharge: your spouse can enroll, but you pay an extra monthly fee, often $50 to $150, if they had access to their own employer’s plan and turned it down.
- Spousal carve-out: your spouse is simply ineligible for your plan if they could get coverage through their own employer.
Domestic partner coverage isn’t required by federal law and varies by employer. If your employer does cover a domestic partner who isn’t your tax dependent, the fair market value of that coverage may be treated as taxable income to you.
Your Protections Under Federal Law
A floor of federal law applies to virtually every employer plan.
ERISA, the Employee Retirement Income Security Act, sets the ground rules for private-sector plans. It requires your employer to give you a Summary Plan Description explaining what’s covered, what it costs, and how to file a claim. It also guarantees your right to appeal a denied claim through an internal process and, if that fails, to sue for benefits in federal court.9U.S. Department of Labor. ERISA When a claim is denied, that internal appeal is worth actually pursuing.
HIPAA’s nondiscrimination rules bar employer plans from denying you eligibility or charging higher premiums based on health factors, including medical history, claims experience, genetic information, or disability.10U.S. Department of Labor. Health Coverage Portability (HIPAA) Compliance FAQs HIPAA also grants special enrollment rights tied to specific life events like the birth of a child.
The Mental Health Parity and Addiction Equity Act requires plans that cover mental health or substance use disorder treatment to apply the same financial requirements and treatment limits used for medical and surgical care. Copays, deductibles, visit limits, and prior authorization rules for therapy or substance use treatment can’t be more restrictive than for a comparable physical health benefit.11U.S. Department of Labor. Mental Health and Substance Use Disorder Parity One boundary: the law doesn’t force plans to cover mental health at all; if the plan includes it, parity applies.12CMS. The Mental Health Parity and Addiction Equity Act (MHPAEA)
Self-Insured vs. Fully Insured: Why It Matters
Your employer’s plan falls into one of two categories. In a fully insured plan, your employer buys a policy from an insurance company that assumes the financial risk of paying claims. In a self-insured (or self-funded) plan, the employer pays claims out of its own funds, often hiring an insurance company only to administer the plan.
A majority of workers at large employers are in self-insured plans, and the distinction matters because self-insured plans are regulated primarily by federal law and are largely exempt from state insurance mandates. If your state requires coverage for something like infertility treatment or acupuncture, that mandate may not apply to your plan. If you’re wondering why your plan doesn’t cover something your state supposedly requires, this is often why. Your Summary Plan Description or HR department can tell you which type you’re in.
What Happens When You Leave the Job
Coverage usually runs through the end of the month in which your employment ends, though some employers cut benefits on your last working day. Confirm the exact date with HR so you don’t hit an unexpected gap.
If your former employer has 20 or more employees, COBRA lets you continue the same group coverage for up to 18 months after a job loss or reduction in hours. You pay the full premium (the employer’s share plus yours) along with a 2% administrative fee.13U.S. Department of Labor. FAQs on COBRA Continuation Health Coverage for Workers If your employer was paying $600 a month toward your premium and you were paying $150, your COBRA bill will be roughly $765. You have 60 days from receiving the COBRA election notice to enroll.14U.S. Department of Labor. Health Benefits Advisor for Employers – COBRA Election A disability extension can stretch coverage to 29 months, and a second qualifying event like divorce or the covered employee’s death can push it to 36. Employees at smaller companies may have similar rights under state “mini-COBRA” laws.
Losing employer coverage also opens a 60-day special enrollment period to buy an individual plan through the Health Insurance Marketplace.15HealthCare.gov. Getting Health Coverage Outside Open Enrollment Depending on your income, premium tax credits can make a Marketplace plan considerably cheaper than COBRA. Run the comparison before defaulting to COBRA; a subsidized Marketplace plan frequently costs less for comparable coverage.