A pillar guide · No red countdown

COBRA vs. the ACA marketplace: the honest math (2026)

When job-based coverage ends, COBRA and the ACA Marketplace can create two different routes. Their clocks do not necessarily start on the same date, and there is no universal winner. This guide shows the inputs to verify before you compare them.

Last reviewed: July 2026

Two clocks, with different starting rules

Losing job-based coverage is a qualifying event, and it opens two windows at once:

The marketplace Special Enrollment Period
The federal loss-of-coverage window generally runs from 60 days before to60 days after the loss. The Marketplace determines eligibility and the coverage effective date; enrolling before the loss can help avoid a gap.
The COBRA election period
A plan must provide at least 60 days to elect, measured from the later of coverage loss or the election notice. If COBRA applies, timely election and payment can make continuation coverage retroactive; confirm the exact deadline, premiums due, and payment instructions on the plan notice.

Sources: HealthCare.gov;U.S. Department of Labor.

What COBRA really is

COBRA generally continues the employer group coverage you already had, subject to the same plan changes that can apply to similarly situated active employees. That can preserve network and accumulator continuity. In return:

It usually lasts up to 18 months — longer in some cases (up to 29 months with a disability determination, or up to 36 months for certain dependents, such as after a divorce or aging off a parent's plan).
You pay the entire premium — the share your employer used to cover plus your own — up to 102% of the plan's cost (the extra 2% is an administrative fee). That is why the bill can feel like a sudden jump even though the plan hasn't changed.
It applies to employers with 20 or more employees. Smaller employers aren't covered by federal COBRA, but many states have a "mini-COBRA" law that works similarly — check your state.

Source: U.S. Department of Labor, CMS.

What to verify on the Marketplace

A Marketplace plan is new coverage with its own network, formulary, deductible, and out-of-pocket limit. Depending on the household and the rules in effect for the coverage year, the Marketplace may determine that premium tax credits or cost-sharing reductions apply. Verify these items in the live application:

The premium after any tax credit shown in the official eligibility result—not an estimate from this guide.
The plan's effective date and first-premium deadline.
Whether current clinicians, facilities, prescriptions, and planned care are covered.
How a new deductible and out-of-pocket limit compare with the progress already made under the employer plan.

Sources: KFF;HealthCare.gov. Eligibility and amounts depend on the live application and current rules.

What can favor each route

Marketplace coverage may compare well when…

The official application confirms financial help and the net premium is lower.
You're early in the plan year and haven't met much of your deductible.
You don't need to keep a specific doctor or hospital that a marketplace plan wouldn't cover.

COBRA may compare well when…

You've already paid down a big deductible or out-of-pocket max this year — a new plan resets it to $0.
You're mid-treatment, mid-pregnancy, or have procedures scheduled with your current doctors.
The exact Marketplace options do not produce a meaningful premium advantage after the official eligibility result.
You need a short bridge and the plan's election and payment terms fit the timing.

The one trap to avoid

Decide before you elect COBRA. Once you're enrolled in COBRA, you generally can't switch to a subsidized marketplace plan until the next Open Enrollment, or until your COBRA runs out or your employer stops contributing — those count as qualifying events. Voluntarily dropping COBRA or simply stopping payment mid-period does not open a Special Enrollment Period. If there's any chance the marketplace is a better fit, compare it before the applicable enrollment and election windows close.

Source: KFF;HealthCare.gov.

Sources

Last reviewed: July 2026. Rules and figures change; confirm current specifics at HealthCare.gov, with the U.S. Department of Labor, or with your plan administrator. This is general information, not legal or financial advice.