Reviewed September 2026.
Leaving a group plan for HealthCare.gov or a state exchange is a timing + subsidy + network decision, not only a premium comparison. Subsidy basics: Premium tax credit. Enrollment windows: Open enrollment.
When a switch is often on the table
| Trigger | Why Marketplace enters | Watch-outs |
|---|---|---|
| Job loss / hours drop / COBRA quote lands | SEP usually opens; PTC may apply | Compare COBRA vs Marketplace for the same effective date |
| Employer plan fails PTC affordability / minimum-value tests | You may qualify for APTC on an exchange plan | An affordable employee-only offer that meets minimum value can block that employee’s PTC even if declined. Family affordability is a separate test; run the Marketplace application for each person |
| Spouse’s job offer is weaker than exchange + PTC | Family can move at open enrollment or a qualifying event | Confirm whose plan is primary for kids |
| You need a different network or formulary | Exchange SBCs may fit specialists better | Leaving mid-year without a SEP is usually blocked |
| Moving to self-employment | Individual market + PTC replace group rates | Budget for HDHP/HSA changes if relevant |
COBRA mechanics if you need a short bridge: COBRA health coverage. Cost-sharing literacy: Deductibles.
When staying on employer coverage usually wins
- Employer pays most of the premium and the plan is affordable under PTC tests.
- You are mid-treatment with a narrow network the exchange plans do not include.
- You lack a qualifying event and open enrollment is months away.
- HSA eligibility or employer HSA seed would be lost without a replacement strategy.
- Dental/vision are bundled cheaply at work and you would buy separate policies on the exchange.
Worked sketch: spouse coverage vs Marketplace
Alex pays $420/month for employee-only group coverage ($1,800 deductible). Adding a spouse would cost $980/month total employee premium. A Marketplace shopping tool shows ~$310/month combined for two adults on a silver plan ($5,500 deductible) only if each adult’s APTC eligibility clears (illustrative; not a promise). If Alex’s employee-only offer is affordable and meets minimum value under Marketplace rules, Alex may be ineligible for PTC even after declining the group plan; the spouse’s eligibility is a separate determination.
| Path | Monthly premium | Care friction |
|---|---|---|
| Employer employee-only + spouse on Marketplace (if spouse qualifies for APTC) | $420 + spouse’s net premium | Two plans and two deductibles; each person is covered once, not dual-covered |
| Both on Marketplace at open enrollment / SEP | ~$310 combined only if both pass PTC eligibility | One SBC each; confirm doctors and drugs; re-check if Alex’s job offer blocks Alex’s credit |
| Family on employer plan | $980 | Same network; highest premium in this sketch |
Alex lists every doctor and drug, completes the Marketplace application so the tool applies employee/family affordability tests, and only drops group coverage when each new plan’s effective date is confirmed in writing.
Checklist
- Run a Marketplace application for an APTC estimate before quitting group coverage.
- Confirm a SEP or open-enrollment start date that avoids a coverage gap.
- Compare SBCs: deductible, OOP max, network, formulary.
- Ask HR when group coverage actually ends (end of month vs end of severance).
- Update HSA contribution elections if you leave an HDHP.
Educational only. Not tax or insurance advice. PTC affordability and SEP rules are fact-specific; confirm on HealthCare.gov or your state exchange and with HR.