When Does Health Insurance Expire After Leaving a Job in California?

In California, employer-sponsored health insurance usually expires on either your last day of work or the last day of the month you leave, and which one applies depends on the contract between your employer and its insurance carrier rather than any state or federal rule. Knowing the exact date matters, because every option for staying covered after that, federal COBRA, Cal-COBRA, a Covered California plan, or Medi-Cal, runs on a deadline that starts the moment your group coverage ends.

When Your Coverage Actually Ends

There is no single California rule setting the last day of your benefits. Some employers end coverage at midnight on your final day of work. Others keep you on the plan through the last day of the calendar month in which you separated. Leave on March 8 under an end-of-month policy and you stay insured through March 31. Under a last-day-of-work policy, coverage is gone that same evening.

Your Summary Plan Description, the benefits booklet you received when you were hired, states which approach your employer uses. If you can’t find it, ask HR before your last day. That exact termination date is the starting point for every deadline that follows, including the 60-day COBRA election window and the Covered California special enrollment period.

If You Have a Severance Agreement

Some employers continue subsidized health benefits during a severance period. In a typical arrangement, you stay on the group plan at the same employee-rate premium until severance ends or a set number of months pass, whichever comes first. This subsidized window runs concurrently with COBRA. It counts against your 18-month COBRA clock rather than adding time on top of it. When severance ends, you can continue COBRA at the full unsubsidized premium of up to 102% of the plan cost for whatever months remain.

Read the agreement carefully. The COBRA election notice you receive may show the full 102% premium, but you will only pay the lower active-employee rate while severance lasts. The date the subsidy ends is the date your cost jumps.

Your Options to Stay Covered

Federal COBRA

If your employer has 20 or more employees, federal COBRA lets you keep the same group health plan for up to 18 months after a job loss or reduction in hours.¹² You pay the full premium your employer used to subsidize, plus a 2% administrative fee, for a total of up to 102% of the plan’s cost.³ Monthly premiums of $600 to $2,000 or more are common, especially for family coverage.

Two situations extend the 18 months. A Social Security disability determination made during the first 60 days of COBRA can push coverage to 29 months (with the premium rising to as much as 150% during the extra months), and a second qualifying event affecting a spouse or dependent child, such as divorce or the covered employee’s death, can extend their coverage to 36 months from the original job loss.²⁴ Both require written notice to the plan administrator before the original 18 months expire.

Cal-COBRA

If your employer has between 2 and 19 employees, federal COBRA doesn’t apply. California’s Continuation Benefits Replacement Act, known as Cal-COBRA, fills the gap with similar continuation coverage through your former employer’s plan.⁵ Cal-COBRA also picks up where federal COBRA leaves off: once you exhaust 18 months of federal COBRA, Cal-COBRA can extend your total continuation period to 36 months from the original qualifying event.⁶ The administrative surcharge under Cal-COBRA can be up to 10% on top of the plan premium, compared with 2% under federal COBRA.

Covered California

Losing job-based coverage triggers a Special Enrollment Period on the Covered California marketplace. You can apply up to 60 days before your coverage ends and up to 60 days after.⁷ Apply before your employer coverage ends and your new plan starts on the first day of the following month, with no gap.⁸ Apply after it ends and the same rule applies, but you now have a gap to cover. You’ll need documentation of the coverage loss, such as a termination letter or notice from your former insurer.

Unlike COBRA, Covered California plans may qualify you for income-based premium subsidies. If your income has dropped, a marketplace plan is often significantly cheaper than COBRA for comparable coverage. The tradeoff is the provider network: a marketplace plan won’t match your old group plan’s doctors and specialists. If you are mid-treatment with a specific provider, continuity may be worth the higher COBRA price.

Medi-Cal

If losing your job also means losing most of your income, Medi-Cal may be the best option. Eligibility is based on income, not employment status. Most adults qualify with household income at or below 138% of the federal poverty level, roughly $22,025 per year for a single person in 2026.⁹ You can apply at any time; there is no enrollment window. If you apply through Covered California and your income qualifies, the system routes you to Medi-Cal automatically.¹⁰ Coverage can begin the same month you apply, usually with no premium. Check Medi-Cal eligibility before committing to a COBRA premium at 102% of a group plan.

The Deadlines That Matter Most

COBRA has several moving parts, and missing any one of them ends your continuation rights permanently.

After a qualifying event, your employer has 30 days to notify the plan administrator. The administrator then has 14 days to send you an election notice, for a combined maximum of 44 days.¹¹ If your employer extends coverage through the end of the month, that clock starts when coverage actually ends, not on your last day of work.¹²

Once you receive the notice (or once coverage ends, whichever is later), you have 60 days to elect COBRA.¹² Send the election form by certified mail or through the administrator’s online portal, and keep proof. You can only continue plans you were already enrolled in; COBRA doesn’t let you switch to a different option your employer offered.

After electing, you have 45 days to make the first payment, which must cover the retroactive period from when your employer coverage ended through the current month.² Because COBRA is retroactive to the date you lost coverage, any medical expenses from the gap are picked up once payment processes.¹² That retroactive feature is why some people wait before electing: if nothing happens, they skip COBRA entirely; if something does, they elect and backdate. Miss the 45-day deadline and continuation rights are gone for good.

After the first payment, each monthly premium has a 30-day grace period past its due date.¹² The plan may suspend coverage during a late payment but must reinstate you if the money arrives in time. Let the grace period lapse and termination is permanent.

California’s Penalty for Going Without Coverage

California penalizes residents who go without minimum essential coverage. For the 2025 tax year (filed in 2026), the penalty is the greater of a flat $950 per uninsured adult and $475 per uninsured child, or 2.5% of household income above the filing threshold.¹³ A family of four without coverage for a full year could owe $2,850 or more. The penalty is prorated by month, so a short gap costs less than a full year uninsured, but even a two-month lapse adds up. The 60-day COBRA election window and the Covered California special enrollment period exist precisely so you can avoid both the gap and the penalty.

What Happens to Your HSA and FSA

Health Savings Accounts and Flexible Spending Accounts follow completely different rules when you leave a job.

Your HSA belongs to you. When you leave, you keep the entire balance, including any employer contributions. There is no vesting period and no deadline to spend the money, which you can use for qualified medical expenses whether or not you are currently insured. What changes is your ability to contribute: new contributions require enrollment in an HSA-eligible high-deductible plan, and your annual limit is prorated by the months of eligible coverage. For 2026, full-year limits are $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up if you are 55 or older.¹⁴

FSAs work the opposite way. The account is owned by your employer’s plan, and any unspent balance is generally forfeited when your employment ends.¹⁵ You typically have a short window after your termination date, often around 90 days but varying by plan, to submit claims for expenses incurred while you were still employed. After that, the remaining money is gone.

If a COBRA Election or Claim Is Denied

Employer health plans are governed by ERISA, which gives you the right to a full and fair review if a claim or continuation request is denied.¹⁶ Your Summary Plan Description sets out the appeal procedures and timelines, and the plan cannot charge you to appeal.

If an internal appeal doesn’t resolve it, you can file a complaint with the U.S. Department of Labor’s Employee Benefits Security Administration for federal COBRA disputes, or with the California Department of Managed Health Care or California Department of Insurance for Cal-COBRA disputes. Internal appeal deadlines are usually measured in days, so read any denial letter the day it arrives.

1
U.S. Department of Labor. Continuation of Health Coverage (COBRA)
2
Office of the Law Revision Counsel. 29 USC 1162 – Continuation Coverage
3
U.S. Department of Labor. FAQs on COBRA Continuation Health Coverage for Employers and Advisers
4
Centers for Medicare & Medicaid Services. COBRA Continuation Coverage
5
California Legislative Information. California Insurance Code 10128.50
6
California Department of Insurance. Frequently Asked Questions
7
Covered California. Special Enrollment Fact Sheet
8
Covered California. Major Life Changes
9
Covered California. Program Eligibility by Federal Poverty Level for 2026
10
Covered California. Can I Have Medi-Cal and Be Employed?
11
Office of the Law Revision Counsel. 29 USC 1166 – Notice Requirements
12
U.S. Department of Labor. FAQs on COBRA Continuation Health Coverage for Workers
13
California Franchise Tax Board. Personal Health Care Mandate
14
Internal Revenue Service. Revenue Procedure 2025-19
15
Internal Revenue Service. Notice 2013-71 – Modification of Use-or-Lose Rule for Health Flexible Spending Arrangements
16
U.S. Department of Labor. Filing a Claim for Your Health Benefits