Health insurance pricing feels random until someone shows you the machine. It is not random — every plan is built from the same five numbers, priced from the same short list of legal factors, and discounted by the same federal subsidy rules. This guide walks through that machine in plain English: what each number on a plan actually does, how the metal tiers work, what genuinely moves your cost, and how to compare plans with five questions.
One thing you will not find here: price quotes. Your cost depends on your household, your ZIP code, and your subsidy eligibility, so any number printed on a page would be wrong for most readers. This page explains the machine. A licensed agent — or our 60-second subsidy checker — can run your actual numbers.
The 5 numbers on every plan
Every plan you will ever compare — bronze or platinum, Marketplace or off-Marketplace — is a different arrangement of the same five numbers. To make each one concrete, we will run the same hypothetical $1,000 medical bill through it.
1. Premium
The premium is the fixed amount you pay every month to keep the plan active, whether you see a doctor or not. It is the one number on this list the $1,000 bill never touches: have zero bills this year or thirty, the premium stays the same. It also does not count toward your deductible or your out-of-pocket maximum — it is the price of admission, not a payment on care.
2. Deductible
The deductible is what you pay for covered care before the plan starts sharing costs.
3. Copay
A copay is a flat fee for a specific service — a set dollar amount for a primary-care visit, urgent care, or a prescription tier.
4. Coinsurance
Coinsurance is the percentage split between you and the plan after your deductible is met.
5. Out-of-pocket maximum
The out-of-pocket maximum is the ceiling: the most you can pay for covered, in-network care in a year. Your deductible, copays, and coinsurance all count toward it; premiums do not.
Metal tiers decoded
Marketplace plans come in four metal tiers. The metal says nothing about the quality of care — it describes the share of total costs the plan pays on average across a typical population, standardized by the federal government (see healthcare.gov's plan categories):
- Bronze — plan pays about 60% on average. Lowest premiums, highest deductibles. Fits people who rarely use care and mainly want protection from a catastrophic year.
- Silver — about 70%. The middle path, and for many households the smartest tier on the board, for the reason below.
- Gold — about 80%. Higher premium, much lighter cost-sharing. Fits people with regular prescriptions, ongoing conditions, or a planned procedure.
- Platinum — about 90%. The highest premiums and lowest out-of-pocket costs. Fits heavy, predictable care usage — where offered at all.
The silver sweet spot: if your household income qualifies for cost-sharing reductions (CSRs), those extra discounts apply only to silver plans. A CSR-enhanced silver plan can carry gold- or platinum-level deductibles and copays at silver-tier pricing — one of the most overlooked moves on the Marketplace. Our subsidies guide covers who qualifies.
What actually moves your cost
For ACA marketplace plans, federal law allows only a short list of rating factors. These are the levers:
- Age. Insurers may charge older adults up to three times what they charge a 21-year-old — the single biggest personal factor.
- Location. Your ZIP code sets your "rating area." Local hospital contracts and insurer competition move prices more than most people expect.
- Household size. Who is on the plan — you, a spouse, kids — scales the total.
- Tobacco use. Federal rules allow up to a 50% surcharge for tobacco users; some states limit or ban it.
- Plan tier and design. Metal tier, network breadth, and deductible structure, as covered above.
- Subsidies. The biggest lever of all — see the next section.
Notice what is not on the list: your health. Marketplace plans cannot charge you more for pre-existing conditions, prior claims, or your sex. That is federal law, not a sales pitch. If a plan quote required detailed medical questions to set your price, it was not a marketplace plan — ask what you are actually being sold.
Premium vs. deductible: the trade-off most people get backwards
Most shoppers sort plans by the lowest monthly premium and stop there. That is backwards, because your real annual cost is twelve months of premium plus what you actually spend on care. A low premium usually buys a high deductible, and a low deductible usually costs a higher premium — the two numbers are on a seesaw.
How to pick your side of the seesaw:
- Low premium, high deductible wins when you are healthy, take few or no prescriptions, and could absorb a bad-luck bill up to the deductible. You are buying catastrophe protection, not everyday coverage.
- Higher premium, lower deductible wins when you have regular prescriptions, an ongoing condition, kids who see doctors often, or a procedure planned. You will hit the cost-sharing either way — so pre-pay it in smaller, predictable monthly pieces.
The honest stress test: add twelve premiums to the plan's out-of-pocket maximum. That sum is your true worst-case year. Two plans that look far apart on monthly price often land surprisingly close on worst-case cost — and sometimes the "expensive" one is actually the cheaper worst case.
The subsidy wildcard
Everything above sets a plan's sticker price. Subsidies decide what you actually pay — and for eligible households they rewrite the math entirely. Premium tax credits scale with your household income measured against the federal poverty level, which is published annually by the federal government (healthcare.gov's FPL overview). Lower income relative to FPL generally means a larger credit, and cost-sharing reductions can stack on top for silver plans, as covered above.
Subsidy rules have shifted more than once in recent years, so never rule yourself out from a full-price quote or an old assumption. Run your household's numbers through our health subsidy checker, and read ACA subsidies explained for how the credit is calculated and reconciled at tax time.
How to compare plans without losing your mind
Five questions cut through almost any plan lineup:
- What is my worst-case year? Twelve premiums plus the out-of-pocket max. Compare plans on this number first.
- Are my doctors and hospital in network? A cheap plan with the wrong network is an expensive plan. Check names, not just the network label.
- Are my prescriptions on the formulary — and at what tier? The same drug can sit on different tiers on different plans, with very different copays.
- How do I actually use care? Count last year's visits and refills honestly. Frequent users lean toward richer tiers; rare users lean leaner.
- Is this comprehensive major-medical coverage? Some plans sold online are not comprehensive major-medical coverage — short-term and fixed-indemnity products cover far less and are not a substitute for it. Ask the question directly and get the answer in writing.
If you can answer those five, you know more than most shoppers — and a 15-minute call with a licensed agent can settle the rest.
Frequently asked questions
Why does my premium go up even when I barely used my plan?
Marketplace premiums are priced on the whole local risk pool, not on you alone. When medical costs, hospital contracts, and drug prices rise in your rating area, everyone's premium moves with them. Your personal claims history cannot be used to raise your marketplace premium.
Can a pre-existing condition make my marketplace plan cost more?
No. Federal law bars marketplace plans from charging more or denying coverage based on health history, prior claims, or sex. Some products sold outside the marketplace system work differently — one more reason to confirm exactly what you are buying before you enroll.
Is the plan with the lowest premium the cheapest plan?
Only if you use very little care. Your real annual cost is twelve months of premium plus what you spend on deductibles, copays, and coinsurance. A low-premium plan with heavy cost-sharing can cost more over a full year than a richer plan, depending on how much care you use.
What counts toward my out-of-pocket maximum?
Your deductible, copays, and coinsurance for covered in-network care all count. Monthly premiums, out-of-network care on most plans, and services your plan does not cover do not count toward the maximum.
When can I switch to a plan that fits my costs better?
Open Enrollment for 2027 marketplace coverage runs November 1, 2026 through January 15, 2027 — enroll by December 15, 2026 for coverage starting January 1. Outside that window, qualifying life events such as losing job coverage, moving, or a household change can open a Special Enrollment Period. See our Open Enrollment 2027 guide.