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COBRA vs ACA Marketplace — Subsidy Math + Switch Verdict

COBRA total cost vs ACA premium with subsidy by income + household size. FPL %, premium tax credit, recommended path.

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COBRA vs ACA Marketplace Calculator

FULL premium (employer + employee portion). Your COBRA cost will be this amount + 2% admin fee. Find on COBRA notice or HR portal.

Administrative load typical 2%. Fixed by COBRA law at maximum 2% of premium for standard election (102% total). 150% in disability extensions.

All persons claimed on tax return. Drives FPL calculation and subsidy eligibility for ACA. 2025 FPL: $15,060 single, $20,440 family of 2, +$5,380 per additional person.

MAGI = AGI + foreign earned income excl + tax-exempt interest. Drives FPL % and subsidy. Use latest tax-return AGI as proxy.

COBRA max 18 months (29 if disability extension). ACA can run indefinitely. Estimate gap until next employer coverage or Medicare eligibility.

Silver is benchmark for subsidy calc. Bronze cheapest premium but high deductible. Gold/platinum higher premium but lower OOP. Silver special: cost-sharing reductions if below 250% FPL.

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What This Calculator Does

The COBRA vs ACA Marketplace calculator answers the most-asked question in the 20-day window after a job loss: do I take COBRA continuation at full premium + 2% admin fee, or jump to the ACA marketplace where my income may now qualify me for a substantial premium tax credit subsidy? It compares total annualized cost across both paths using your household size, MAGI (which drives FPL %), expected coverage duration, and ACA tier preference.

The bias problem is severe and time-critical. Most people receive their COBRA election notice 1-3 weeks after job loss, panic, and elect COBRA without checking the ACA path — locking in $1,500-2,500/month for 18 months when they could have qualified for a $200-400/month subsidized silver plan. The ACA Special Enrollment Period (SEP) triggered by job loss only stays open 60 days; COBRA election window is also 60 days. Miss either and you forfeit. Through 2025, the ARPA/IRA subsidy enhancement caps your premium at 8.5% of MAGIregardless of FPL tier — no subsidy cliff. Post-2025 the cliff may return; verify on healthcare.gov before locking in long-duration coverage.

The Math — FPL %, Subsidy, and Two-Path Comparison

The Affordable Care Act establishes the premium tax credit (PTC) under IRC §36B. The formula caps your premium contribution at a percentage of MAGI (modified adjusted gross income), with the federal subsidy filling the gap up to the second-lowest-cost silver plan in your area (the “benchmark”). ARPA (2021) and IRA (2022) extensions removed the 400% FPL cliff through 2025, capping contribution at 8.5% of MAGI for all incomes above 400% FPL. Post-2025, statutory authority for the enhancement may lapse — bake this in when planning multi-year coverage.

Worked example: family of 3, employer plan total $1,500/mo, MAGI $55K, 12 months of coverage needed, silver tier. FPL family-of-3 = 15,060 + 2 × 5,380 = $25,820. FPL %: 55,000 / 25,820 = 213% — subsidized tier. Contribution cap: ~6.5% of MAGI = $3,575/yr = $298/mo. Benchmark silver in typical metro: ~$1,400/mo for family-3. PTC = $1,400 − $298 = $1,102/mo subsidy. ACA silver net: $298/mo. COBRA: $1,500 × 1.02 = $1,530/mo. Annual delta: ($1,530 − $298) × 12 = $14,784 saved by switching to ACA. For most laid-off workers post-2021, ACA wins decisively.

How to Use This Calculator

  1. Get your employer plan total monthly premium (full employer + employee portion) from the COBRA notice or HR portal. Your COBRA cost is this amount + 2% admin fee.
  2. Confirm COBRA admin fee % (typically 2%, capped at 2% by law for standard election; 50% for disability extensions).
  3. Enter household size (all persons claimed on tax return). Drives FPL calculation and subsidy eligibility.
  4. Enter MAGI: AGI + foreign earned income exclusion + tax-exempt interest. Use latest tax-return AGI as proxy if MAGI not separately tracked.
  5. Enter months of coverage needed. COBRA max 18 months (29 with disability extension). ACA can run indefinitely. Estimate gap until next employer coverage or Medicare eligibility.
  6. Pick ACA plan tier: bronze (~85% of silver premium), silver (benchmark), gold (~120%), platinum (~140%). Silver is unique — subsidy benchmark + cost-sharing reductions if income below 250% FPL.

Three Worked Examples

Example 1 — Single laid-off worker, low income

Single, $850/mo employer premium, MAGI $32K (post-layoff), 9 months coverage. FPL %: 32,000 / 15,060 = 213%. Contribution cap: ~6.5% MAGI = $173/mo. Benchmark silver ~$520/mo single. PTC: $347/mo subsidy. ACA silver net: $173/mo. COBRA: $867/mo. Monthly savings: $694. Over 9 months:$6,246 saved. ACA also brings cost-sharing reductions on silver (deductible drops to ~$1,000 vs $5,500 unsubsidized) — double benefit.

Example 2 — High earner with chronic condition

Family of 4, $2,200/mo employer premium, MAGI $250K, 18 months coverage, ongoing specialist + Rx. FPL %: 250,000 / 31,200 = 801% — well above old 400% cliff. ARPA cap: 8.5% of MAGI = $1,771/mo contribution. Benchmark silver family-4: ~$2,500/mo. PTC: $729/mo. ACA silver net: $1,771/mo. COBRA: $2,244/mo. Monthly savings: $473. Annual: ~$5,700. But: chronic-condition family may want gold/platinum for lower OOP — ACA gold reaches $2,800/mo, cancellling subsidy advantage. COBRA may win for heavy utilizers who keep existing provider network.

Example 3 — Sabbatical with rich savings

Couple, $1,400/mo employer premium, MAGI $40K (sabbatical year, intentionally low), 12 months coverage, healthy users. FPL %: 40,000 / 20,440 = 196%. Contribution cap: ~6% MAGI = $200/mo. Benchmark silver couple: ~$900/mo. PTC:$700/mo subsidy. ACA bronze (cheaper): silver × 0.85 = $765/mo gross, minus $700 PTC = $65/mo net. COBRA: $1,428/mo. Monthly savings:$1,363. Annual: $16,356 saved. Sabbatical-year intentional-low-MAGI is the optimal ACA arbitrage.

Common Mistakes

  • Missing the 60-day windows. Both COBRA election (60 days from notice) and ACA SEP (60 days from coverage end) close fast. Set calendar reminders immediately upon receiving the COBRA notice. Past 60 days = forfeit coverage path forever. Many people lose coverage entirely by missing both.
  • Failing to update MAGI projection mid-year. ACA subsidy is estimated based on projected income. End of year reconciles on Form 8962. If you earn more than projected, you owe back the excess subsidy (capped at $300-1,500 depending on income tier). Update marketplace promptly when income changes.
  • Ignoring cost-sharing reductions on silver.If your MAGI is below 250% FPL, silver tier gets cost-sharing reductions: deductible drops to $700-1,500, OOP max drops to $3,000-7,000. Bronze offers no CSRs — silver beats bronze decisively at low FPL even at higher premium.
  • Buying short-term plans instead. Short-term plans are cheaper but exclude pre-existing conditions, mental health, prescription drugs, maternity. Useful only as gap coverage between major plans. NOT a substitute for ACA.
  • Forgetting HSA-eligible HDHP availability on marketplace.Filter marketplace by “HSA Eligible”. Most bronze qualify; silver less common. Lets you keep HSA contributions during gap year — meaningful for high-income tax-deferred savers.
  • Assuming COBRA “keeps your doctor”.COBRA continues your existing employer plan — same network, same provider, same prescription formulary. ACA marketplace plans have their own networks, sometimes narrower. Verify your specific providers and prescriptions are in-network on any ACA plan before switching mid-treatment.
  • Not exploring spouse’s employer plan SEP.Job loss is a qualifying event for spouse’s employer plan special enrollment too. Spouse coverage may be cheaper than COBRA or ACA. Check spouse’s HR within 30-60 days of your job-loss event.

When This Calculator Decides For You

  1. Switch to ACA if MAGI < 400% FPL AND COBRA > $800/mo. Subsidy almost always wins; CSRs on silver below 250% FPL add bonus value.
  2. Stay on COBRA if you have ongoing specialist treatment in-network OR deductible already met for the year. Switching mid-treatment risks out-of-network costs; deductible/OOP-max already paid is real money.
  3. Switch to ACA if MAGI > 400% FPL AND ARPA cap (8.5%) is below COBRA cost. Through 2025, no cliff. Verify post-2025 status before assuming subsidy persists.
  4. Use spouse’s employer plan if their SEP triggers cheaper coverage. Job loss often opens both spouses’ benefits to mid-year change — lowest cost wins.

Coverage Gap Is the Biggest Hidden Quitting Cost

Health insurance gap is one of the largest hidden costs of quitting a job — often $10-30K over a year of self-employment or sabbatical. Run the Should I Quit My Job Runway calculatorwith COBRA or ACA cost as the realistic health-insurance line item to size true runway. If you’re continuing to fund retirement during a gap year, the HSA Triple Tax Optimizer works only if you stay on an HSA-eligible HDHP — filter marketplace plans accordingly. For full take-home math at projected gap-year income (which drives next year’s ACA MAGI), use the Take-Home Pay calculatorto plan your MAGI strategically — intentional-low-income years can unlock substantial subsidy + Roth conversion windows simultaneously.

Frequently Asked Questions

The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.

  • How long does COBRA coverage last?
    Standard 18 months from qualifying event (job loss, hours reduction). 29 months if disability determination from SSA. 36 months for spouse/dependent qualifying events (employee death, divorce, dependent aging out). Multiple qualifying events can extend; consult plan administrator. Cannot stack COBRA across multiple employers.
  • What is the 60-day election window?
    Must elect COBRA within 60 days of qualifying event OR receipt of election notice (whichever later). Coverage retroactive to event date if elected. Past 60 days = forfeit COBRA rights forever. Many people lose coverage by missing this window — set calendar reminder immediately on receiving notice.
  • What qualifying events trigger ACA SEP?
    Special Enrollment Period triggered by: job loss (60 days), marriage (60 days), divorce, birth/adoption of child, moving to new ZIP code, gaining citizenship/lawful presence, death of family member with coverage, exiting incarceration. Verify on Healthcare.gov within 60 days of event.
  • What is the subsidy cliff and how does it work?
    Pre-ARPA: above 400% FPL = no subsidy at all (the cliff). ARPA/IRA extension through 2025: capped premium at 8.5% of MAGI regardless of FPL — no cliff. Post-2025 (TBD): cliff may return. For 2024-2025, subsidies extend to higher incomes than pre-ARPA. Plan around 2026 expiration risk.
  • Gold vs silver vs bronze — which?
    Healthy + low expected medical = bronze (low premium, high deductible). Average users = silver (subsidy benchmark + cost-sharing reductions if income below 250% FPL). Heavy medical users (chronic conditions, frequent specialist) = gold/platinum despite higher premium. CSRs only on silver — others lose this.
  • Are HSA-eligible HDHPs available on the marketplace?
    Yes. Filter on marketplace by 'HSA Eligible'. Most bronze plans qualify; silver/gold less common. HDHP = $1,650+ deductible single / $3,300+ family with $8,300/$16,600 OOP max (2025 limits). Lets you keep HSA contributions during gap year.
  • What is premium tax credit reconciliation?
    Subsidy estimated based on projected income. End of year: actual income reconciled on Form 8962. If you earned more than projected, owe back excess subsidy (capped). If less, you receive remaining subsidy. Update marketplace promptly when income changes during year to avoid year-end surprise.
  • What is the job-loss SEP?
    Loss of employer coverage triggers ACA Special Enrollment Period. 60 days from coverage end to enroll in marketplace plan. Coverage starts day after election (no retroactive coverage like COBRA). Useful when COBRA premiums prohibitive — most laid-off workers find ACA cheaper post-subsidy.
  • Can spouses have separate plans?
    Yes, both COBRA and ACA. Each spouse can elect independently. Useful when one spouse needs specific provider/network or has chronic condition with a specific carrier. ACA tax credit calculated based on household MAGI but can be allocated across plans. Consult tax professional for optimization.
  • What about short-term plans?
    Cheaper but limited duration (3 months original; 12-36 months in some states; 2024 federal rule reverts). Often exclude pre-existing, mental health, prescription drugs, maternity. Useful only as gap coverage between major plans. NOT a substitute for ACA — don't use as long-term solution.