Summary: Standard COBRA lasts 18 months after job loss or hours reduction. Second qualifying events like divorce or a child aging out can extend it to 36 months, and disability can add 11 months at a higher premium. This guide explains each duration rule, the deadlines that protect them, and what happens when COBRA runs out.
COBRA's duration rules are more generous than most people realize and more technical than most people expect. The 18-month headline is just the starting point; extensions, second events, and state laws layer on top.
Know your maximum before you need it, because the extensions have their own notice deadlines.
The 18 months run from the qualifying event, not from when you elect or first pay. Elect on day 59 and you have about 16 months left, not 18. The retroactive coverage for the gap months is real insurance, you were covered, but the calendar does not pause while you decide.
Extensions stack on the original event date too. A second qualifying event in month 10 extends to 36 months from the original event, not 36 from the second event. When you calendar your coverage end date, anchor every calculation to the original qualifying event and work forward; anchoring to election or payment dates is the classic off-by-two-months error.
Termination of employment (voluntary or involuntary, except gross misconduct) and reduction of hours trigger 18 months of COBRA for the employee, spouse, and dependent children. The clock starts at the qualifying event, not at your election: if you take 60 days to elect, those days count against the 18 months.
Eighteen months is designed as a bridge: long enough to find new work with benefits, short enough that it is not a permanent alternative to the individual market. Plan the bridge explicitly rather than drifting through it.
If a second qualifying event occurs during the initial 18 months, coverage can extend to 36 months from the original event. Second events include the covered employee's death, divorce or legal separation, the employee becoming entitled to Medicare, or a dependent child aging out of the plan.
The extension is not automatic: the plan must be notified of the second event, generally within 60 days. Miss the notice deadline and the extension is lost. This is the most commonly forfeited COBRA right, because families dealing with divorce or death are not thinking about benefits notices.
If the Social Security Administration determines that a qualified beneficiary was disabled within the first 60 days of COBRA, coverage can extend 11 months beyond the 18, for 29 months total. The tradeoff: the premium for the extension months can rise to 150 percent of the plan cost.
The disability determination must occur within specific timeframes and the plan must be notified. The 150 percent premium makes this extension expensive, but for a disabled beneficiary with no other options it can be the only bridge to Medicare, which itself has a 24-month waiting period after disability onset.
If the employee becomes entitled to Medicare before the qualifying event, the spouse and dependents may get up to 36 months from the Medicare entitlement date. The interactions are technical and depend on sequencing: Medicare first then job loss produces different rights than job loss then Medicare.
One critical warning: delaying Medicare Part B because you have COBRA is usually a mistake. COBRA does not count as creditable coverage for Part B purposes, and delaying Part B past 65 while on COBRA triggers late penalties. COBRA and Medicare coordination is the area most worth a benefits counselor's time.
Federal COBRA applies to employers with 20 or more employees. Smaller employers fall under state mini-COBRA laws, which vary widely: some states extend continuation to firms with as few as 2 employees, with durations from a few months to 36 months. California, New York, and several others have notably generous versions.
If your employer had fewer than 20 employees, ignore the federal rules above and look up your state's continuation law specifically. Your state's insurance department is the authoritative source, and the rules differ enough that federal guidance will mislead you.
COBRA ends at the maximum duration, when you get other group coverage, when you enroll in Medicare, or when premiums go unpaid. Before it ends, you get another special enrollment window for the marketplace, so the end of COBRA is not the end of options.
Calendar the end date from day one and start shopping 60 days out. The people who get hurt are the ones who treat month 18 as a surprise rather than a deadline they have known about for a year and a half.
Ask the administrator for written confirmation of your exact end date early in month 16. Administrators occasionally miscalculate extensions, and catching a two-month error before your coverage lapses beats discovering it at a pharmacy counter. Keep that confirmation with your election notice; together they are your proof of coverage dates if any dispute arises later.
18 months for voluntary or involuntary termination (except gross misconduct) and for hours reduction. The clock starts at the qualifying event.
Yes, if a second qualifying event (divorce, death, Medicare entitlement, child aging out) occurs during the initial 18 months and the plan is notified within 60 days.
State continuation laws for employers with fewer than 20 employees, who are exempt from federal COBRA. Duration and rules vary by state.
COBRA can end when you become covered under another group health plan. You may also keep COBRA alongside new coverage in some situations; check the plan terms.
COBRA duration rules per federal DOL guidance; state laws vary. This guide is for planning only.