Health insurance has its own vocabulary of cost-sharing terms that determine how much you’ll actually pay for care. Understanding how these terms interact — in sequence — makes it possible to compare plans accurately and avoid unexpected bills.
The five cost-sharing terms
Premium: The monthly amount you pay to maintain your health insurance, regardless of whether you use any care. Paying the premium keeps the policy active; it doesn’t reduce what you owe when you get care.
Deductible: The amount you pay out of pocket for covered services before your insurance begins paying its share. If your deductible is $2,000 and you have a $3,000 surgery, you pay $2,000 and your insurance covers the remaining $1,000 (minus coinsurance). Deductibles reset at the start of each plan year.
Copay: A fixed dollar amount you pay for a specific service, often at the time of the visit. A $30 copay for a primary care visit means you pay $30 regardless of the total bill. Many plans don’t apply copays toward the deductible.
Coinsurance: The percentage of covered costs you pay after meeting your deductible. With 20% coinsurance, once your deductible is met, you pay 20% of each covered bill and your insurance pays 80%.
Out-of-pocket maximum: The annual cap on what you can be required to pay for covered services. Once you reach this limit, your insurance covers 100% of covered costs for the rest of the plan year.
How they work together
The costs accumulate in a specific order:
- You pay 100% of covered costs until you hit your deductible
- After the deductible, you pay your coinsurance percentage on covered costs
- Copays may or may not count toward the deductible (check your plan)
- Once your combined payments reach the out-of-pocket maximum, insurance pays 100%
Example: Plan with $1,500 deductible, 20% coinsurance, $6,000 out-of-pocket max.
- You have a $2,000 hospitalization: you pay $1,500 (deductible) + 20% of $500 = $1,600 total
- Later in the year you have $30,000 in further covered costs: you keep paying 20% until you’ve paid $4,400 more (reaching the $6,000 cap)
- Any additional covered care that year: $0 out of pocket
2026 ACA limits
For 2026 marketplace plans, the ACA sets maximum out-of-pocket limits:
- Individual: $10,600
- Family: $21,200
No compliant ACA plan can make you pay more than these amounts for covered in-network services in a single year. Plans with lower out-of-pocket maximums exist — they just cost more in premiums.
Plan tiers and cost tradeoffs
ACA marketplace plans use metal tiers to describe the cost-sharing split:
| Tier | Insurer pays (avg) | You pay (avg) | Good for |
|---|---|---|---|
| Bronze | 60% | 40% | Low premium seekers; rarely use care |
| Silver | 70% | 30% | Baseline; required for cost-sharing reductions |
| Gold | 80% | 20% | Moderate to high expected healthcare use |
| Platinum | 90% | 10% | High expected use; expensive but predictable costs |
These percentages are averages across the plan’s covered services — your actual cost-sharing on any specific service depends on the plan’s specific deductible, copays, and coinsurance structure.
In-network vs out-of-network
The deductible and out-of-pocket maximum apply to in-network providers. Out-of-network care is often subject to a separate, higher deductible and out-of-pocket max — or may not be covered at all under HMO plans. Verify whether a provider is in-network before scheduling care.
Choosing between a high-deductible and low-deductible plan
Higher-deductible plans have lower premiums. They make financial sense if:
- You’re generally healthy and use little care in a typical year
- You have savings to cover the deductible if needed
- The high-deductible plan is HSA-eligible — the plan must meet IRS minimum deductible and maximum out-of-pocket thresholds; check the plan’s summary of benefits or healthcare.gov to confirm HSA eligibility
Lower-deductible plans cost more each month but give predictable costs if you have ongoing prescriptions, therapy, or expect significant care in the coming year.