On January 29, 2026, CMS finalized the number that decides how bad your worst year can get. For plan years starting in 2027, the out-of-pocket maximum on an individual health plan rises to $12,000, up from $10,600 in 2026. Family coverage goes from $21,200 to $24,000. That is a 13% increase in a single year, and it moved through the regulatory process with almost no public attention, because the out-of-pocket maximum is the number nobody shops on.
The deductible is the number everyone shops on. It sits at the top of every plan comparison, in bold, and it is the figure people quote when they say a plan is good or bad. That is backwards. Your deductible describes the beginning of a bad year. Your out-of-pocket maximum describes the end of one, and the second number is the one that determines how much of your savings a health plan is capable of consuming.
The deductible only tells you where cost sharing starts
Think of your health plan as a staircase with three landings. Below the deductible, you pay the full negotiated price of most care yourself. The insurer is still working for you at this stage, because you pay the rate it negotiated rather than the sticker price, but the money is yours.
Once you cross the deductible, coinsurance begins. Now the bill splits, commonly 80% to the plan and 20% to you. This is where most people’s mental model stops, and it is why a bad year surprises them. Twenty percent of an unbounded number is still an unbounded number.
The third landing is the out-of-pocket maximum. Every dollar you paid toward the deductible, every copay, and every coinsurance payment for in-network covered care accumulates toward one running total. When that total hits the cap, your share drops to zero and the plan pays 100% of covered in-network care for the rest of the plan year. The cap is not a target or a guideline. It is a hard ceiling written into federal rules, and it resets every January.
The Kaiser Family Foundation’s 2025 Employer Health Benefits Survey found the average general annual deductible for single coverage at $1,886, with 34% of covered workers facing $2,000 or more. Those are the numbers people plan around. The same survey found that 21% of covered workers have a single-coverage out-of-pocket maximum above $6,000, which is more than three times the average deductible and is the number that actually describes their exposure.
What counts toward the out-of-pocket maximum, and what quietly does not
The cap has holes in it, and each hole is a way for a bad year to run past the ceiling you thought you had.
Premiums never count. You keep paying them in January after you hit the cap in July, and you keep paying them in December. The out-of-pocket maximum caps what you pay for care, not what you pay for coverage. That means your real worst-case number is the cap plus twelve months of premiums, and any comparison that ignores this will steer you wrong.
Going out of network usually breaks the accounting. Some plans run a separate out-of-network maximum at two or three times the in-network figure, some run none at all, and either way the dollars you spend there stop accumulating toward the cap you were counting on. Services the plan simply does not cover, most cosmetic work among them, never enter the tally in the first place. So does balance billing, where a provider outside your network invoices you for the gap between their charge and what your plan paid. The No Surprises Act has blocked the most common versions of that since 2022, mainly emergency care and out-of-network clinicians working inside in-network hospitals, which covers the situations where you had no realistic ability to choose. It does not cover a specialist you picked yourself.
Preventive care runs in the other direction. Under the Affordable Care Act, non-grandfathered plans must cover a defined list of preventive services at no cost to you before you have paid a dollar toward the deductible. The annual physical, standard screenings, and immunizations on that list are free at the point of service. Healthcare.gov publishes the current list, and it is worth reading once, because people routinely skip care they have already paid for through their premium.
Two plans, one bad year, and the arithmetic that reverses the obvious choice
Once you put both numbers into the same equation, the ranking can invert. Compare two employer plans for a single person.
Plan A costs $140 a month in payroll deductions, has a $2,000 deductible, 20% coinsurance, and a $7,000 out-of-pocket maximum. Plan B costs $95 a month, has a $3,500 deductible, 20% coinsurance, and a $4,000 out-of-pocket maximum. Plan A looks better on the number everyone reads. Its deductible is $1,500 lower.
Now give both of them a bad year. Say you need a procedure the plan has negotiated down to $42,000. Under Plan A, you pay the $2,000 deductible, then 20% of the remaining $40,000, which is $8,000. That would be $10,000 total, except the cap stops you at $7,000. Add $1,680 in premiums for the year and Plan A costs you $8,680.
Under Plan B, you pay the $3,500 deductible, then 20% of the remaining $38,500, which is $7,700. The cap stops you at $4,000. Add $1,140 in premiums and Plan B costs you $5,140.
The plan with the worse deductible is $3,540 cheaper in the year it matters most, and it is also cheaper in a year when you use no care at all, because the premium is lower. The deductible was the only number where Plan A won, and the deductible is the number that stops mattering the moment your bills get large. Notice too that in both cases you blew through the deductible and landed on the cap. That is the pattern in any genuinely expensive year: the deductible is a speed bump you clear in the first week, and the maximum is where you actually come to rest.
Family coverage hides a second cap almost nobody hears about
This is the part that plan comparison articles skip, and it is worth more than everything above to a family with one sick member.
Family coverage has two structures. Under an aggregate deductible, the whole family deductible must be satisfied before the plan pays anything for anyone. Under an embedded deductible, each person has an individual deductible nested inside the family one, and once a single member meets theirs, the plan starts paying for that person even if the family total is nowhere close.
Read that as a difference in when help arrives. Take a family carrying a $6,800 family deductible where one child needs ongoing asthma treatment and everyone else is healthy. Under the aggregate version, that child’s care is paid entirely out of pocket until the household has spent all $6,800, and a healthy family will not get there quickly. Under the embedded version, the plan starts paying for that child at $3,400, months earlier and thousands of dollars sooner, on identical medical facts.
The protection that follows is the one people never hear about. Since plan years beginning in 2016, federal rules have required that the self-only annual limitation on cost sharing apply to every individual, including individuals enrolled in family coverage. In plain terms, no single person can ever be charged more than the individual out-of-pocket maximum, $10,600 in 2026 and $12,000 in 2027, even under a family plan with an aggregate deductible and a $21,200 family cap. One family member cannot be made to absorb the entire family maximum alone. Milliman’s summary of the 2027 limits walks through how plan sponsors have to apply this, and if your benefits materials never mention it, that is a documentation gap and not an exception.
Why the ceiling keeps rising, and what that means for the cash you hold
The out-of-pocket maximum is indexed. CMS recalculates it each year using a premium adjustment percentage that tracks growth in private health insurance premiums per enrollee, which is why the limit climbs whether or not anything about your plan changes. The 2027 Notice of Benefit and Payment Parameters sets the new figures, and it also permits certain bronze marketplace plans to run limits as high as $15,600.
The practical consequence is that the size of the emergency fund a health plan can demand from you is rising faster than wages, and it is now knowable in advance. Your plan’s out-of-pocket maximum is a published number. It is the largest medical bill a single year can hand you for in-network covered care. Knowing it turns a vague anxiety into a budgeting question: how much of that ceiling do you want sitting in cash, how much belongs in an HSA if your plan qualifies for one, and how much can go to a flexible spending account election you have to lock in before January.
When your open enrollment materials arrive this fall, read the deductible, then keep reading. The out-of-pocket maximum, plus twelve months of premiums, is the real price of the plan in the year you need it. Everything above that line is the insurer’s problem, which is what you were buying in the first place.