Health Insurance Deductible vs Premium

The trade, stated plainly

Every health plan offers the same bargain in different proportions: pay more every month, or pay more when you need care. A low-premium plan charges less per paycheck and makes you pay the first thousands of medical bills yourself through the deductible. A high-premium plan charges more per paycheck and starts sharing costs sooner, through a lower deductible. Neither is a better deal in the abstract. The better deal depends on one number most shoppers never compute: how much medical care they will actually bill in the year.

The calculator on this site prices that trade with two plans. Plan A charges $250 a month, carries a $4,000 deductible, 20% coinsurance, and an $8,000 out-of-pocket maximum. Plan B charges $400 a month, carries a $1,000 deductible, 20% coinsurance, and a $4,000 out-of-pocket maximum. The premium gap is $150 a month, or $1,800 a year, in Plan B's favor to overcome. Everything that follows is that $1,800 being earned back, dollar by dollar, as billed charges rise.

How the gap gets earned back

Below $1,000 in billed charges, neither plan's deductible matters much: both plans make you pay your bills in full, so the out-of-pocket gap is zero and Plan A wins by the full $1,800 premium gap. At $800 in bills, Plan A totals $3,800 for the year and Plan B totals $5,600. The cheap plan wins by $1,800, and the deductible never enters the conversation.

Between $1,000 and $4,000 in bills, the gap closes fast. Plan B has met its deductible, so it pays only 20% of each further dollar, while Plan A still pays every dollar until $4,000. Each additional dollar of bills closes the gap by 80 cents. The formula is simple when both plans share a coinsurance rate: the break-even bill amount equals the lower deductible plus the premium gap divided by one minus the coinsurance rate. Here that is $1,000 plus $1,800 divided by 0.80, which is $1,000 plus $2,250, or $3,250. At $3,250 in bills, both plans total exactly $6,250 for the year.

Above $3,250, Plan B wins, and the margin grows. At $3,500 in bills, Plan A totals $6,500 and Plan B totals $6,300: Plan B wins by $200. The out-of-pocket gap there is $2,000, Plan A paying $3,500 against Plan B's $1,500, which beats the $1,800 premium gap by $200. At $12,000 in bills, Plan A totals $8,600 and Plan B totals $8,000: Plan B wins by $600, with an out-of-pocket gap of $2,400. In the worst case, with both plans at their out-of-pocket maximums, Plan A totals $11,000 and Plan B totals $8,800: Plan B wins by $2,200. The richer plan's advantage grows with the bills, which is exactly why healthy households and sick households rationally choose opposite plans.

The three mistakes shoppers make

The first mistake is comparing premiums only. A $150 monthly gap looks like $1,800 a year, and it is, but it is not the whole year. The household that picks Plan A on the premium and then bills $12,000 pays $600 more than it would have on Plan B, and the household that picks Plan B on the security and then bills $800 pays $1,800 more than it would have on Plan A. The premium is the most visible number on the enrollment page and the least complete.

The second mistake is treating the deductible as the maximum. It is not. After the deductible comes coinsurance, and after coinsurance comes the out-of-pocket maximum, which is the real worst case. A $4,000 deductible with 20% coinsurance and an $8,000 maximum can cost $8,000 in out-of-pocket spending, double the deductible, before the plan pays everything. Shoppers who budget for the deductible and stop there are budgeting for half the exposure.

The third mistake is using last year as the forecast without adjusting. Last year's bills are the best single predictor available, but they miss the predictable: a planned surgery, a pregnancy, a child starting orthodontics, a prescription that moves to a higher tier. The honest method is to price three scenarios, a light year, a typical year, and a heavy year, and pick the plan that wins two of the three, or the plan whose worst case you can actually afford. The calculator's scenario table does exactly that, and the worst-case row deserves more weight than the typical row when the household budget has no slack.

When the cheap plan wins even though you get sick

There is one case where the low-premium plan wins at high bills too: when its out-of-pocket maximum is low enough, or the premium gap is large enough, that the gap never closes. If Plan A's premium advantage were $4,000 a year instead of $1,800, Plan B's maximum out-of-pocket advantage of $4,000 would only just tie it, and Plan A would win or tie at every bill level. That is not a theoretical edge case. It is the shape of many employer plans where the company prices the high-deductible option aggressively and seeds the Health Savings Account on top, which is a separate subsidy the premium comparison misses entirely.

The reverse case matters too. When the premium gap is small and the deductible gap is large, the rich plan wins early and by a lot. A $50 monthly gap is only $600 a year; at 20% coinsurance, the break-even sits just $750 above the lower deductible. Households in that situation should think twice before taking the cheap plan for the premium savings, because one emergency room visit erases several years of premium savings. The break-even formula makes both cases visible in seconds, which is why it belongs on the enrollment page and not in a benefits booklet footnote.

The decision rule

Price both plans at your best guess for billed charges, at half that guess, and at double it. If one plan wins all three, take it. If the winner flips, take the plan that wins the scenario you can least afford to get wrong, and check whether its worst case fits your emergency fund. Then check the network and the drug list, because a plan that wins on arithmetic and excludes your doctor has not won anything. The deductible-versus-premium trade is the largest financial decision most households make at open enrollment, and it is decided by one computed number, not by a feeling about premiums. Run the number.

Deductible questions

What is the break-even point between two health plans?

The bill amount where both plans cost the same for the year. At the calculator defaults, $250 a month with a $4,000 deductible against $400 a month with a $1,000 deductible, both at 20% coinsurance, the break-even is $3,250 in billed charges.

Is a high deductible plan better if I am healthy?

Usually yes, if the premium savings exceed the extra out-of-pocket risk. At the defaults, a light $800 year saves $1,800 on the low-premium plan. But check the worst case too: the low-premium plan costs $2,200 more if both plans hit their out-of-pocket maximums.

Does coinsurance matter for the break-even?

Yes, when the plans differ. With equal coinsurance, each dollar of bills between the two deductibles closes the gap by one minus the coinsurance rate, 80 cents at 20%. With different coinsurance rates, the break-even moves, and the calculator recomputes it live.

Keep reading

• How Much Does Health Insurance Cost?The KFF averages and the worker share behind them.
• HDHP vs PPO CostThe plan-type version of this trade, with HSA math.
• How to Choose a Health PlanThe open enrollment checklist around this decision.
• Health Insurance Cost CalculatorPrice both plans by total yearly cost, with the break-even bill amount.