COBRA vs Marketplace Insurance: How to Calculate the Cheaper Option

The Default Choice Is Rarely the Correct Choice

Losing employer-sponsored health insurance triggers a reflex. HR hands you a COBRA election notice, and most people sign it. The coverage feels familiar. The network stays the same. The decision feels safe.

It is frequently the most expensive decision you will make that month.

COBRA forces you to pay 100% of the health insurance premium, plus a 2% administrative fee. Your employer was covering a significant portion of that premium while you worked. The moment you separate, that subsidy disappears. A plan that cost you $210 per month as an employee can easily cost $780 per month under COBRA. Nothing about the coverage changed. Only the price changed.

The Marketplace alternative is not automatically cheaper, either. But for most people earning between 100% and 400% of the federal poverty level (FPL), Advance Premium Tax Credits (APTCs) reduce Marketplace costs substantially. Some households pay under $100 per month for silver-tier coverage. Others pay more than COBRA. The only way to know is to run the actual numbers.

What COBRA Actually Costs

COBRA premiums are set by your former employer's plan. You can find the exact figure on your election notice. If you have not received it yet, your HR department must provide it within 14 days of your coverage loss.

The 2024 average premiums reported by KFF break down as follows:

• Individual COBRA coverage: approximately $624 per month
• Family COBRA coverage: approximately $1,778 per month

These figures include the 2% administrative surcharge. Multiply by 12 and individual coverage runs $7,488 per year. Family coverage runs $21,336 per year.

You have 60 days from the loss of coverage to elect COBRA, and coverage can be backdated. That backdating feature has real value if you incur a significant medical expense during the election window. You can elect COBRA retroactively, cover the claim, and then drop coverage again if Marketplace options prove cheaper for ongoing needs. This is a legitimate strategy, not a loophole.

What Marketplace Coverage Actually Costs

Marketplace premiums vary by age, location, tobacco use, and plan tier. The subsidy calculation matters most.

APTCs reduce your monthly premium to a percentage of your household income, based on the benchmark silver plan in your area. For 2025, the calculation caps your premium contribution at:

• 2% of income for households at 100% to 133% FPL
• Up to 8.5% of income for households at 300% to 400% FPL
• Above 400% FPL, the 8.5% cap still applies through 2025 under current law

The 2025 FPL for a single person is $15,060. For a family of four, it is $31,200.

Worked Example 1: Single Individual, $52,000 Annual Income

Mark lost his job as a project manager. His COBRA premium is $589 per month, or $7,068 annually.

His income for the coverage year will be $52,000. That puts him at approximately 345% FPL for a single person.

At 345% FPL, the benchmark premium cap is approximately 8.15% of income, or $4,238 per year, which is $353 per month.

If the benchmark silver plan in his metro area costs $510 per month, his APTC is $157 per month ($510 minus $353). He pays $353 per month.

Compared to COBRA at $589 per month, the Marketplace saves Mark $236 per month, or $2,832 per year.

The decision is not automatic. Mark's COBRA plan covers his specialist network. He should verify that Marketplace silver plans in his area include those providers before switching. If they do, switching is straightforward. If they do not, the cost difference determines whether network continuity is worth $2,832 annually.

Worked Example 2: Family of Four, $78,000 Annual Income

The Chen family loses employer coverage when one spouse changes careers. Their COBRA premium is $1,640 per month, or $19,680 annually.

Household income of $78,000 for a family of four represents approximately 250% FPL.

At 250% FPL, the benchmark premium cap is approximately 6% of income, or $4,680 per year, which is $390 per month.

The benchmark silver plan for their family in their area costs $1,420 per month. Their APTC is $1,030 per month ($1,420 minus $390). They pay $390 per month.

COBRA costs $1,640 per month. The Marketplace costs $390 per month. The annual difference is $14,760.

At that spread, network continuity and deductible differences rarely close the gap. The Chens should switch, verify their pediatrician and primary care providers are in-network, and bank the savings.

The Variables That Change the Outcome

Deductibles and Out-of-Pocket Maximums

COBRA preserves your existing plan structure. If you met $2,000 of your $3,500 deductible before losing coverage, COBRA lets you apply those met costs to the same plan year. A Marketplace plan resets your deductible to zero.

If you have a scheduled surgery or ongoing high-cost treatment in the near term, COBRA's deductible continuity can outweigh a lower premium. Calculate your expected out-of-pocket costs under each scenario, not just the monthly premium.

The Duration of the Coverage Gap

COBRA coverage runs up to 18 months for job loss or reduction in hours. Marketplace plans have no such time limit.

If you expect to return to employer-sponsored insurance within three to four months, COBRA may be administratively simpler. But simpler is not the same as cheaper.

Special Enrollment Windows

Losing job-based coverage qualifies you for a Special Enrollment Period (SEP) on the Marketplace. You have 60 days from the date of coverage loss to enroll. Miss that window and you wait until the next Open Enrollment period in November, or qualify for another SEP.

COBRA's 60-day election window and the Marketplace's 60-day SEP window run concurrently. You do not have to choose COBRA first and then switch. You can evaluate both options and enroll in a Marketplace plan before your COBRA window closes.

The Calculation You Should Run Before Deciding

Pull these four numbers before making any decision:

1. Your exact COBRA monthly premium (from your election notice)
2. Your projected household income for the coverage year
3. The benchmark silver plan premium in your zip code (available at healthcare.gov)
4. Your expected medical utilization for the year, including any known procedures or prescriptions

With those four inputs, you can calculate your net monthly cost under each option and model the full-year financial impact.

The income figure is critical and frequently underestimated. If you lost your job mid-year, your annualized income for subsidy purposes is lower than your prior-year income. Use your projected income for the current calendar year, not last year's W-2. Underestimating income and receiving too large an APTC creates a repayment obligation at tax time. Overestimating means leaving credits on the table.

When COBRA Actually Wins

COBRA is the better choice in specific, calculable circumstances:

• You are within weeks of qualifying for new employer coverage and have high accumulated deductible costs under the current plan.
• Your Marketplace network excludes a specialist or facility you are actively using for a serious condition.
• Your household income exceeds the subsidy thresholds and the Marketplace premium without a subsidy exceeds your COBRA cost.
• You need retroactive coverage for a claim already incurred during the election window.

Outside of those conditions, the Marketplace typically wins on cost for income levels below 400% FPL. Above that threshold, the comparison tightens and the answer depends on plan specifics.

Run the Numbers Before the Clock Runs Out

You have 60 days. That deadline is firm. After it passes, your options contract significantly.

The CalcMoney insurance comparison tool lets you input your COBRA premium, household income, and zip code to model your net monthly cost under both options. It pulls current benchmark plan data and applies the 2025 APTC formula automatically.

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Most people who run the comparison are surprised by the spread. Run it now, while both options are still available to you.