What Is a Deductible? How Health Insurance Works

A deductible is the amount you pay for covered health care each year before your insurance starts paying its share. With a $2,000 deductible, the first $2,000 of covered care is on you; after that you split the bill with your plan until you reach a yearly cap.

Quick version

• Premium: what you pay every month just to have the plan.
• Deductible: what you pay for care before the plan starts sharing costs.
• Copay and coinsurance: your share of each bill after the deductible (a flat fee or a percentage).
• Out-of-pocket maximum: the most you’ll pay for covered in-network care in a year. For 2026 Marketplace plans it can’t be more than $10,600 for one person.
• Lower premium usually means higher deductible. Pick based on how much care you expect.

What a deductible is, and the other three numbers

HealthCare.gov’s glossary defines each of these, and they apply in this order:

1. Premium: your monthly bill. You pay it whether or not you see a doctor, and it doesn’t count toward anything else on this list.
2. Deductible: what you pay for covered services before the plan pays. ACA-compliant plans still cover a list of preventive care, like many screenings and vaccines, before you meet it.
3. Copay or coinsurance: once the deductible is met, a copay is a flat fee (say $20 for an office visit) and coinsurance is a percentage of the allowed cost (say 20%). Some plans charge copays for certain visits even before the deductible, so check your plan’s Summary of Benefits and Coverage.
4. Out-of-pocket maximum: once your deductible, copays and coinsurance add up to this number, the plan pays 100% of covered in-network care for the rest of the plan year. Premiums, care your plan doesn’t cover, out-of-network care and charges above the allowed amount don’t count toward it.

The deductible resets every plan year. If you switch plans midyear, say for a new job, you usually start over at zero.

A year of bills, worked out in dollars

Say your plan has a $2,000 deductible, 20% coinsurance and a $6,000 out-of-pocket maximum. Here’s what you’d pay in three different years (premiums not included):

In the first row the plan pays nothing, because small bills sit entirely inside the deductible. That surprises plenty of people who expected their insurance to chip in. The third row shows the out-of-pocket maximum at work: your share would have been $9,600, but the cap stops you at $6,000.

The numbers are made up but realistic. KFF’s 2025 survey found the average deductible for single coverage through an employer was $1,886, and 34% of covered workers had a deductible of $2,000 or more.

High or low deductible: a quick chooser

Two plans from the same employer, side by side:

• Plan A (low deductible): $250 a month ($3,000 a year), $1,000 deductible, 20% coinsurance, $4,000 out-of-pocket max.
• Plan B (high deductible): $150 a month ($1,800 a year), $4,000 deductible, 20% coinsurance, $7,000 out-of-pocket max.

Total yearly cost (premiums plus what you pay for care):

Here’s the math on the tie: Plan B costs $1,200 less in premiums, and in this range every dollar of care costs you $1 on Plan B but only 20 cents past the deductible on Plan A. Those lines cross at $2,500 of care. Below that, the high-deductible plan wins; above it, the low-deductible plan does.

Lean toward the high deductible if you rarely see a doctor, have no regular prescriptions, and have enough savings to cover the full deductible. A high-deductible plan may also let you open a health savings account (HSA), which has tax advantages.

Lean toward the low deductible if you have a chronic condition, take regular medications, are planning a baby or surgery, or would struggle to pay a few thousand dollars on short notice.

If you go with the high deductible, bank the premium difference. Plan B costs $100 a month less than Plan A. Move that $100 into a savings account (or an HSA, if your plan qualifies) on payday, and after 12 months you have $1,200 set aside, close to a third of the $4,000 deductible. Keep it up for three years without a big medical bill and you’d have $3,600, nearly the whole deductible, built from money you would otherwise have paid in premiums.

Redo this math with your own plans’ numbers every open enrollment, because prices and plan designs change from year to year.

Read your own plan in 15 minutes

1. Find your Summary of Benefits and Coverage (your HR portal or insurer’s website has it).
2. Write down the four numbers: premium, deductible, coinsurance or copays, out-of-pocket max.
3. Check whether there are separate deductibles for in-network and out-of-network care, or for prescriptions.
4. Log into your insurer’s app and see how much of this year’s deductible you’ve already met.
5. Look up your doctors and nearest urgent care in the plan’s network. Out-of-network bills don’t count toward your in-network cap.
6. Before a planned procedure, ask the provider for a cost estimate and compare it to the Explanation of Benefits (EOB) your insurer sends afterward.

What the pros say

• Brian Preston and Bo Hanson, hosts of The Money Guy Show, say a high-deductible plan is often fine for young, healthy people who rarely see a doctor, but suggest skipping it in a year you expect big costs, like having a baby. They tell viewers to line up the deductible, coinsurance and out-of-pocket maximum for each option and redo that comparison every open enrollment, because plans change.
• Jennifer Lammer, founder of Diamond NestEgg, explains that no-deductible plans charge higher premiums (in one comparison she showed, about $1,100 more a year), and warns that a cheap plan can hide high copays, high coinsurance or a thin provider network.
• Marshall Allen, the former ProPublica reporter and author of Never Pay the First Bill, advises getting an itemized bill, checking it for errors and doing a price check before you pay, and, if you do owe it, negotiating for a big discount and never agreeing to a payment plan you can’t afford.

Tools and links that help

Both are free, and they make comparing plans much easier.

Do this this week

• Download your plan’s Summary of Benefits and Coverage and write down its four numbers.
• Check how much of this year’s deductible you’ve already met.
• Put your deductible amount (or as much as you can) into an emergency savings goal.
• Before open enrollment, run your two best plan options through the chooser math above.
• If you’re starting a job, read our guides on filling out a W-4 and negotiating your salary so benefits are part of the conversation.