Under the ACA, only five things can change your monthly health insurance premium. They are your age, where you live, tobacco use, how many people the plan covers and the plan category you pick. Older adults can pay up to three times more than younger adults, and tobacco users up to 50% more. However, your health history and sex can't raise the price.
- ACA plans can charge an adult age 64 or older up to three times what they charge a 21-year-old for the same plan.
- Insurers can charge tobacco users up to 50% more, and a premium tax credit doesn't cover that surcharge.
- A family premium adds up each member, but only the three oldest children under 21 count.
- Your rating area comes from the primary policyholder's address, so a move can change your price.
- For 2027 coverage, tax credits stop above 400% of the poverty line, or $63,840 for one person.
The five factors that set your monthly health insurance premium
A premium is what you pay each month to keep your plan active, whether or not you use care. For ACA plans, federal rules list the only premium rating factors an insurer can use. So once you know the five, you can predict why one quote is higher than another.
| Factor | Federal limit | What it means for you |
|---|---|---|
| Age | Up to 3:1 for adults | Price rises each year from 21 to 64 |
| Location | State rating areas | Your ZIP code shifts the price |
| Tobacco use | Up to 1.5:1 | Up to 50% more, unless your state limits it |
| Who is covered | Sum of each member | Adding a spouse or child adds cost |
| Plan category | Metal level | Higher levels cost more each month |
What can't raise your price
- Your current health or medical history
- Your sex, since everyone pays the same price for the same plan
- A pre-existing condition, either when you apply or after you enroll
Want the basics first? Read what your premium pays for each month. Then look at each factor below and note which ones you can change.
Age: why a monthly health insurance premium climbs over time
Age has the biggest effect on most quotes. Federal rules let insurers charge adults age 64 and older up to three times the rate for a 21-year-old. Also, children 14 and under share one rate, and each year from 15 to 63 has its own step.
Most states use the federal default age curve. However, a few states, including Massachusetts, Minnesota, Oregon and Utah, set their own curves. Here is the default curve by age, shown as a multiple of the age-21 price.
Age in dollars: a quick example
Say a plan costs $400 a month for a 21-year-old. This number is for illustration only, not a quote. Under the default curve, that same plan costs about $511 at age 40 and $714 at age 50. By 64, it reaches $1,200 a month.
So the jump from 50 to 60 is far bigger than the jump from 30 to 40. For that reason, people in their late 50s and early 60s should check for a tax credit every year.
A licensed Vivna agent can price plans for your household and check your tax credit, at no cost to you.
Location: why health insurance costs vary by ZIP code
First, each state divides itself into rating areas, and every insurer in that state must use the same map. In the individual market, the primary policyholder's address decides your area. As a result, two neighbors in different counties can see different prices for a similar plan.
Location matters for two reasons. To begin with, local care costs and provider rates differ. Second, the number of insurers in your area shapes competition. That's why health insurance costs vary so much from one state to the next.
Moving soon? A permanent move to a new area usually opens a special enrollment window. Start with our state-by-state coverage pages to see who sells plans where you live.
Tobacco use: up to 50% more
Insurers can charge tobacco users up to 1.5 times the standard rate. Under federal rules, tobacco use means using tobacco four or more times a week, on average, within the past six months. Religious or ceremonial use doesn't count.
Still, your state may set a lower limit. For example, health plans sold in California and coverage options in New York can't add a tobacco surcharge at all. Meanwhile, Arkansas and Colorado allow only a smaller one.
A premium tax credit lowers only the base price, not the tobacco surcharge. So if your plan costs $511 a month and you use tobacco, the surcharge could add up to about $256 more, and you pay all of it yourself. Answer the tobacco question honestly, because your insurer sets the rate from that answer.
Household size and who the plan covers
In general, insurers price a family plan by adding up the premium for each person. However, only the three oldest covered children under 21 count. So a fourth or fifth young child adds nothing to the premium.
A family example
Take two parents, both 40, with four children ages 4, 7, 10 and 12. Using the same $400 example and the default curve, each parent costs about $511. Each child 14 or under costs about $306, but only three count. Altogether, the family pays about $1,940 a month before any tax credit.
For real family numbers, see our breakdown of what families pay for coverage. Then decide whether everyone belongs on one plan.
Plan category, network and design
By contrast, your metal level is the one factor you fully control. Bronze plans charge the lowest premiums, while Platinum plans charge the most. In return, Bronze pays about 60% of costs for a typical person, and Platinum pays about 90%. Our guide to Bronze, Silver and Gold tiers explains each one.
- Smaller group of doctors and hospitals
- Often an HMO or EPO
- Works well when your doctors are in it
- More doctors and specialists
- Often a PPO
- Fits people who travel or see many specialists
Also, a lower deductible usually means a higher premium, and the reverse is true too. Learn how network size changes what you pay, and weigh the trade-off between deductibles and premiums before you pick.
How tax credits change your monthly health insurance premium
A premium tax credit doesn't change the plan's price. Instead, it lowers the part you pay. The credit equals the cost of your area's benchmark plan, the second-lowest-cost Silver plan, minus what the law expects you to contribute.
A worked example: the 400% cliff
Jordan is single and expects to earn $55,000. That's about 345% of the poverty line, so the expected contribution is 10.22%, or about $468 a month. If the benchmark plan costs $600, Jordan's credit is about $132 a month. These numbers are for illustration only.
Now say Jordan earns $65,000 instead. That's above $63,840, so the credit drops to $0, and Jordan pays the full $600. Our pillar guide to who qualifies for premium tax credits walks through the math. Also, our page on off-exchange health insurance covers buying a plan above the line.
Ways to lower your monthly health insurance premium
You can't change your age or ZIP code. Even so, you control several levers that lower your monthly health insurance premium without dropping coverage you need.
- Update your income
Report your best estimate, and change it when it moves. Starting with tax year 2026, there's no cap on paying back extra credits.
- Compare metal levels
Price Bronze, Silver and Gold side by side, then add your likely care costs.
- Try a narrower network
An HMO or EPO can cost less if your doctors are in it.
- Quit tobacco
Your rate can drop once you no longer meet the tobacco-use definition. Ask your insurer when it updates the rate.
- Shop every fall
Prices and plans change each year, so compare during Open Enrollment.
When two quotes look far apart, line up the five factors first. Usually the gap comes from the metal level or the network, not the carrier. Also, ask us to price the same plan with and without a spouse, since two separate plans sometimes cost less.
Price is set by five factors, and you control more of them than you think.The rule our licensed agents repeat most
For a full look at every cost, read our line-by-line guide to health insurance costs. Or browse our ACA and private medical plan options, and call 888-730-6031 with questions.
Monthly health insurance premium: FAQs
What affects my monthly health insurance premium the most?
For most people, age and location matter most, followed by the metal level they choose. An adult 64 or older can pay up to three times the price for a 21-year-old. Meanwhile, your ZIP code sets your rating area. Tobacco use and the number of people on the plan also change the price.
Can insurers charge more for a pre-existing condition?
No. ACA Marketplace plans can't charge you more or turn you down because of a pre-existing condition. They also can't use your health history or your sex to set your price. After you enroll, the plan can't raise your rate just because your health changes.
Why did my premium go up when nothing changed?
Premiums change each year for several reasons. First, you are a year older, and the age curve rises each year after 21. Second, insurers update rates for local care costs every plan year. Third, your tax credit can shift if the benchmark plan's price changes. So compare plans every fall instead of auto-renewing.
Do tax credits lower the tobacco surcharge?
No. A premium tax credit applies only to the base premium. So if your plan adds a tobacco surcharge, you pay the full surcharge yourself, even with a credit. Some states, such as California and New York, don't allow a tobacco surcharge at all.
Does adding children always raise the premium?
Not always. A family premium adds up each member, but only the three oldest covered children under 21 count. So a fourth child under 21 adds no premium. Adding a spouse, however, always adds that adult's age-based rate. Ask an agent to compare one family plan with separate plans.
Vivna's licensed agents compare plans from 50+ carriers. Call Monday through Friday, 9am to 6pm.
Sources
- How insurance companies set health premiums, from HealthCare.gov
- 45 CFR 147.102: Fair health insurance premiums
- CMS: State-specific market rating variations
- CMS: Guidance on age curves (default federal age curve)
- IRS: Revenue Procedure 2026-26 (2027 applicable percentages)
- KFF: Tobacco surcharges and premium tax credits
Vivna Insurance is a licensed, independent health insurance agency (NPN 19168641). We are not affiliated with HealthCare.gov or any government agency. Plan availability, networks and benefits vary by state and change over time.
Related guides
Find Local Health Insurance Help
Plans, prices and help programs change by state and even by county. These local guides show what is available near you.
More local help: the Georgia health insurance guide, plus guides for Florida, Texas, North Carolina and every state we serve.
Prefer to talk it through? Call 888-730-6031 Monday through Friday, 9 a.m. to 6 p.m. Eastern, for free help from a licensed agent.
