What is the difference between a deductible, coinsurance, and out-of-pocket maximum?

These are three layers of cost-sharing in a health insurance plan. The deductible is the amount you pay 100% of before your insurance starts contributing to covered services — for example, a $3,000 deductible means you pay the first $3,000 of medical bills each year. Once you hit your deductible, coinsurance kicks in: you pay a percentage of each bill (typically 10–30%) while insurance pays the rest. For example, a $1,000 bill after the deductible with 20% coinsurance means you pay $200 and insurance pays $800. The out-of-pocket maximum (OOP max) is the absolute most you will pay in covered costs in a plan year — once you hit it, insurance pays 100% for the rest of the year. The 2025 ACA OOP max limits are $9,450 for individuals and $18,900 for families.

What is an HDHP and should I choose one?

A High Deductible Health Plan (HDHP) has higher deductibles and out-of-pocket costs than traditional plans but significantly lower monthly premiums. In 2025, an HDHP must have a deductible of at least $1,650 for individuals or $3,300 for families. The key benefit: HDHPs are the only plans eligible for a Health Savings Account (HSA). An HSA gives you a triple tax advantage — contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. For a healthy person in the 22% tax bracket contributing the full HSA limit, this saves $847+ in federal taxes per year. HDHPs work best for healthy people who rarely use medical care, high earners who benefit most from the HSA tax deduction, and people who want to invest HSA funds for retirement (unused HSA funds roll over indefinitely).

How do I compare health plans to find the best one for me?

The key insight: the cheapest plan depends on how much medical care you use. For a healthy year with no significant claims, the HDHP with the lowest premium wins. For heavy medical use that hits the out-of-pocket maximum, a Gold plan with lower deductible and OOP max often wins despite its higher premium. Use this calculator's comparison tool to model all four scenarios for each plan you are considering. The breakeven point: if your expected annual medical bills are below the HDHP deductible, the HDHP is almost certainly cheaper (lower premium + lower or equal OOP costs). If you expect to exceed the deductible regularly, calculate whether the premium savings exceed the higher OOP costs. Also consider the HSA: if the HDHP is HSA-eligible and you max the HSA, the tax savings can make the HDHP cheaper even with higher OOP costs.

What does an HSA cover and how does it work?

A Health Savings Account (HSA) is a tax-advantaged account available only with an HDHP. In 2025, you can contribute up to $4,300 (individual) or $8,550 (family). Contributions are tax-deductible (or pre-tax via payroll), funds grow tax-free, and withdrawals for qualified medical expenses are tax-free — this is the triple tax advantage. Qualified expenses include deductibles, copays, coinsurance, prescription drugs, dental, vision, LASIK, and hundreds of other medical costs. Unlike a Flexible Spending Account (FSA), HSA funds roll over year to year with no 'use it or lose it' rule. Importantly, after age 65 you can withdraw HSA funds for any purpose without penalty (only ordinary income tax applies, like a traditional IRA). This makes the HSA function as a stealth retirement account — many financial planners recommend paying medical expenses out-of-pocket if you can afford it, letting HSA funds grow invested for decades.

What is the ACA marketplace and what subsidies might I qualify for?

If you do not have employer-sponsored health insurance, you can buy coverage through the Affordable Care Act (ACA) marketplace at healthcare.gov. The ACA offers premium tax credits (subsidies) to individuals and families with income between 100% and 400% of the federal poverty level (FPL) — and the Inflation Reduction Act (IRA) extended enhanced subsidies so that no one pays more than 8.5% of their income on a benchmark plan through 2025. For 2025, a single person earning up to about $60,240 or a family of four earning up to about $124,800 may qualify for subsidies. Plans are categorized as Bronze, Silver, Gold, and Platinum (referring to the actuarial value — the percentage of average costs the plan covers). Silver plans also offer Cost Sharing Reductions (CSRs) for lower-income enrollees that significantly reduce deductibles and OOP maximums.

Health Insurance Cost Calculator — Total Annual Cost by Scenario

Health insurance costs extend far beyond your monthly premium. Your true annual cost depends on how much medical care you actually use — and whether that usage hits your deductible, triggers coinsurance, or reaches your out-of-pocket maximum. This Health Insurance Cost Calculator models your total a...

HEALTH PLAN CALCULATOR

Plan Type

High deductible, HSA-eligible, lowest premium

Coverage Type

2025 HSA limit: Individual $4,300 · Family $8,550

Monthly Premium

Employer Contribution — monthly

Net monthly: $450 · Annual: $5,400

Annual Deductible

OOP Maximum

Your Coinsurance — % you pay after deductible

HSA Annual Contribution — max $4,300

Income Tax Rate — for HSA savings

ANNUAL PREMIUM

$5,400

WORST CASE TOTAL

$12,400

NET/MO

$450/mo

HSA SAVING

$847

OOP MAX

$7,000

COST SCENARIOS

ANNUAL COST RANGE

$5,400 – $12,400

ANNUAL PREMIUM

$5,400

HSA TAX SAVING

$847

MONTHLY

$450/mo

TOTAL ANNUAL COST BY SCENARIO

Healthy Year$5,400

Premium: $5,400 + OOP: $0

Moderate Use$7,800

Premium: $5,400 + OOP: $2,400

Heavy Use$9,900

Premium: $5,400 + OOP: $4,500

Worst Case$12,400

Premium: $5,400 + OOP: $7,000

Annual premium

Out-of-pocket

💊 HSA BENEFIT (2025)

Annual limit: $4,300 · Triple tax advantage (contribute pre-tax, grow tax-free, withdraw tax-free for medical)

Your HSA tax savings: $847/yr

MONTHLY NET

$450/mo

WORST CASE

$12,400

BEST CASE

$5,400

HSA LIMIT

$4,300

Live chart · updates as you type

Created with❤️byeaglecalculator.com

SCENARIO COST BREAKDOWN

PREMIUM $5,400/YR · DEDUCTIBLE $3,000 · OOP MAX $7,000 · COINSURANCE 20%

SCENARIO	TOTAL CLAIMS	YOU PAY (OOP)	INSURANCE PAYS	ANNUAL PREMIUM	TOTAL COST
Healthy Year Routine checkups only — no major claims	$0	$0	$0	$5,400	$5,400
Moderate Use 1–2 specialist visits, minor procedures	$2,400	$2,400	$0	$5,400	$7,800
Heavy Use Chronic condition, multiple procedures	$10,500	$4,500	$6,000	$5,400	$9,900
Worst Case Major illness/surgery — hits OOP max	$28,000	$7,000	$21,000	$5,400	$12,400

OOP = out-of-pocket. Copays not modelled. Total claims include all in-network medical bills before insurance applies.

PLAN COMPARISON

Compare up to 3 health plans side-by-side across all 4 cost scenarios. Click "Compare Plans" to open the comparison tool.

HOW TO USE

1
Select your plan type — HMO, PPO, EPO, or HDHP. Only HDHPs (High Deductible Health Plans) are eligible for a Health Savings Account (HSA).
2
Select Individual or Family coverage. This affects the HSA contribution limit — $4,300 for individuals and $8,550 for families in 2025.
3
Enter your monthly premium — this is what you pay per month for coverage, before employer contribution.
4
Enter your employer's monthly contribution if applicable. The calculator deducts this to show your net monthly cost.
5
Enter your annual deductible — the amount you pay 100% of before insurance starts sharing costs.
6
Enter your out-of-pocket maximum — the most you will ever pay in a single plan year. Once hit, insurance covers 100% of covered services.
7
Select your coinsurance percentage — what you pay after the deductible (typically 10%–30%). The insurer pays the rest up to your OOP max.
8
If your plan is an HDHP, enter your planned HSA contribution to see your tax savings. Select your tax bracket to get an accurate figure.
9
Click 'Compare Plans' to open the side-by-side plan comparison tool and find which plan is cheapest for your expected usage level.

WORKED EXAMPLE

Example: Monthly premium $450, deductible $3,000, OOP max $7,000, coinsurance 20%, no employer contribution. Annual premium = $5,400. Healthy year (no claims): total = $5,400. Moderate use ($2,400 in claims, below deductible): you pay $2,400 + $5,400 premium = $7,800. Heavy use ($10,500 in claims): you pay deductible $3,000 + coinsurance on $7,500 = $1,500, capped at OOP max $7,000 → total $5,400 + $7,000 = $12,400. Worst case (above OOP max): you pay $5,400 premium + $7,000 OOP max = $12,400 regardless of total claims. HSA contribution $3,850 at 22% tax rate: saves $847/yr, effective annual premium = $5,400 − $847 = $4,553.

REFERENCE FORMULAS

FORMULA REFERENCE TABLE

NAME	FORMULA	DESCRIPTION
Annual Premium	Annual = (Monthly Premium − Employer Contrib) × 12	Net annual premium after employer subsidy
OOP Cost (below deductible)	You Pay = min(Claims, Deductible)	You pay 100% of claims until deductible is met
OOP Cost (above deductible)	You Pay = min(Deductible + (Claims − Deductible) × Coinsurance%, OOP Max)	After deductible, you pay coinsurance % up to OOP max
Total Annual Cost	Total = Annual Premium + min(OOP Cost, OOP Max)	True annual cost including premium and out-of-pocket expenses
HSA Tax Savings	Tax Savings = HSA Contribution × Marginal Tax Rate	Federal tax saved by contributing pre-tax dollars to an HSA
Effective Premium	Effective = Annual Premium − HSA Tax Savings	Net premium after accounting for HSA tax benefit — HDHPs only

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Disclaimer: This calculator is for informational purposes only. Actual costs depend on your specific plan, in-network vs out-of-network usage, copays, and specific services used. HSA limits are for 2025. This is not insurance or tax advice — consult a licensed insurance broker or tax professional.

Last updated: April 25, 2026 · HSA limits reflect 2025 IRS figures · Formula verified by EagleCalculator team · Eagle-eyed accuracy for every calculation.