What it means
The commercial logic is risk pooling. Many people each contribute a modest, predictable premium so that the small number who face very large medical bills in any given year are protected, and the insurer sets the premium so that total contributions cover expected claims plus administration and profit.
Nobody knows in advance who will need the money, which is precisely why the arrangement works. Four features determine what a plan actually costs the individual.
The premium is paid regardless of use, the deductible is the amount paid before the insurer contributes, coinsurance is the percentage the individual pays after the deductible, and the out-of-pocket maximum caps annual exposure. A plan with a low premium and a high deductible is not cheaper in a bad year, only in a quiet one.
For employers, health cover is both a cost line and a recruitment tool. The company typically pays 70% to 85% of the premium and the employee pays the remainder through payroll, so a workforce of any size represents a material and rising annual commitment that has to be budgeted like any other fixed cost.
Renewal negotiations, plan design changes and the choice between fully insured and self-funded arrangements are genuine finance decisions. Self-funding is the significant variant.
Instead of paying a fixed premium to an insurer, a larger employer pays claims directly from its own funds and buys stop-loss cover for catastrophic cases, keeping any savings if claims come in low and carrying the risk if they do not. It reduces cost for employers with a healthy, predictable population and increases volatility for everyone else.
The terminology varies by country and the structures differ enormously, but the underlying mechanics of premium, cost-sharing and pooled risk are close to universal. What changes between systems is who organises the pool and how much of the bill lands on the individual.
In practice
Real-world examples
Example 1
A 12-person marketing consultancy compares two plans: one at $7,200 per employee with a $4,000 deductible and one at $9,600 with a $1,500 deductible. It chooses the higher premium because three staff have ongoing conditions that would hit the deductible every year regardless.
Example 2
A manufacturer with 600 employees moves from a fully insured plan to a self-funded arrangement with stop-loss cover at $150,000 per claim. It saves roughly 9% in the first year but has to hold a larger cash reserve to absorb monthly claim variability.
Example 3
A retail chain adds a telehealth service costing $4 per employee per month. Urgent care visits fall noticeably over the following year, and the saving in claims exceeds the cost of the service.
Think of it
Health insurance is like a breakdown cover service for a car. You pay a small monthly subscription whether you break down or not, and when engine trouble strikes, the provider covers the expensive repair bills.
Formula
Calculation
Employer annual cost = Premium per employee x Employer share % x Number of employees. Individual cost on a claim = Deductible + Coinsurance % x (Claim amount - Deductible), capped at the out-of-pocket maximum.
Take a design agency with 40 employees on a plan costing $9,600 per employee per year. The employer pays 80%, which is $9,600 x 80% = $7,680 per employee, and the employee pays the remaining $1,920, or $160 a month. The agency's total annual cost is 40 x $7,680 = $307,200.
Now follow one employee with a $40,000 hospital claim. The plan has a $1,500 deductible, 20% coinsurance and a $5,000 out-of-pocket maximum. The employee first pays the $1,500 deductible, leaving $40,000 - $1,500 = $38,500, of which 20% is $38,500 x 0.20 = $7,700. Adding the deductible gives $1,500 + $7,700 = $9,200, but the out-of-pocket maximum caps the employee's share at $5,000, so the insurer pays $40,000 - $5,000 = $35,000 and the cap has saved the employee $4,200.Case study
Seen in the real world
This is an illustrative, fictional example. Larkspur Design Group, an invented 40-person agency, faced a renewal quote 19% higher than the prior year, taking its annual employer cost from roughly $258,000 to $307,200 with no change in benefits.
Rather than accept the increase or simply pass more of it to staff, the operations director analysed two years of anonymised claims data with the broker. Around 40% of claims came from urgent care and emergency visits for conditions that a same-day appointment could have handled, and take-up of the existing preventive check was under 30%.
In this illustrative case Larkspur kept the plan design broadly intact, added a low-cost telehealth service, ran an autumn preventive health campaign that lifted screening take-up to 68%, and moved the deductible from $1,000 to $1,500 while raising the employer share from 78% to 80% so most staff saw no net change. The following renewal came in at 6% rather than 19%, and staff enrolment in the plan actually rose.
Watch out
Common mistakes
- Choosing a plan on premium alone. A low premium paired with a high deductible and weak out-of-pocket cap can cost far more in any year with a significant claim.
- Assuming the out-of-pocket maximum covers everything. Premiums, out-of-network charges and services the plan excludes typically sit outside the cap.
- Treating renewal as an administrative task. Plan design, network choice and funding structure are finance decisions with five- and six-figure consequences for a mid-sized employer.
Questions
People also ask
What is the difference between a deductible and coinsurance?
The deductible is a fixed amount paid before the insurer contributes at all, while coinsurance is a percentage of costs shared after the deductible has been met.
Should a small company self-fund?
Usually not, because claims for a small group are too volatile to absorb; self-funding tends to make sense above a few hundred employees where the numbers are more predictable.
Why do premiums rise faster than general inflation?
Medical cost inflation, new treatments and technologies, and an ageing workforce all push claims costs up faster than prices in the wider economy.