Every HDHP vs PPO comparison you will find is a feature table. Lower premium, higher deductible, HSA eligible, good if you are healthy. Cigna’s version contains no numbers at all. MetLife’s shows a sample premium and deductible side by side and never adds them up.
The deductible is the least important number in the comparison. It determines when your plan starts sharing costs, not how much you can possibly lose. The number that caps your downside is the out-of-pocket maximum, and once you compare those instead, a lot of high-deductible plans stop looking risky. Some of them have a lower ceiling than the PPO sitting next to them on the enrollment screen.
The HDHP vs PPO comparison has four terms, not two
Total annual cost of a plan is not the premium and it is not the deductible. It is four things:
Your annual premium contribution, plus whatever cost sharing you actually incur, minus any money your employer puts into your HSA, minus the tax you avoid on your own HSA contributions.
The last two terms are why the feature tables mislead. An employer HSA contribution is a direct transfer that exists only on the HDHP side, and the tax saving is real money that never appears in a benefits comparison chart.
Start with the numbers the IRS sets. For 2026, under Revenue Procedure 2025-19, a qualifying high-deductible plan must have a deductible of at least $1,700 for self-only coverage and cannot have an out-of-pocket maximum above $8,500. The HSA contribution limit is $4,400 for self-only and $8,750 for family coverage. For 2027, Revenue Procedure 2026-24 moves those to a $1,750 minimum deductible, an $8,700 out-of-pocket ceiling, and contribution limits of $4,500 and $9,000.
Note that the minimum deductible is a floor, not a description. KFF’s 2025 Employer Health Benefits Survey found the average single deductible in an HSA-qualified plan was $2,578, about half again above the IRS minimum, with an average out-of-pocket maximum of $4,509. The average PPO single deductible was $1,337.
Why the crossover often does not exist
Here is the piece of arithmetic worth understanding, because it is the reason this decision is usually less close than it looks.
Above both deductibles, if the two plans use the same coinsurance rate, the amount you spend on care cancels out of the comparison. What is left is a fixed expression. The worst the HDHP can do is:
The difference between the two out-of-pocket maximums, minus the premium you save, minus the employer HSA contribution, minus your tax saving.
If that expression comes out at zero or below, the high-deductible plan is cheaper at every single level of medical spending and no breakeven exists. If it comes out positive, a crossover exists somewhere above the point where the PPO’s ceiling binds.
So the entire question reduces to one subtraction you can do on the enrollment screen: is the HDHP’s out-of-pocket maximum higher than the PPO’s, and by more than the three things the HDHP gives you?
Real employer plans fail that test constantly. The University of Arizona’s 2026 state plans put the HDHP at $264 a year in employee premium against $680.64 for the PPO, with a $720 employer HSA seed, and the PPO carries a $7,350 in-network out-of-pocket maximum. The HDHP’s maximum, per the plan’s summary document, is materially lower. When the cheaper plan also has the lower ceiling, there is nothing left to decide.
A worked example where the crossover does exist
To be fair to the PPO, here is an illustrative pair built so that a crossover genuinely appears. These are not one employer’s real plans, they are constructed from the KFF and IRS figures above.
The HDHP costs $1,200 a year in premium, has a $3,400 deductible, 20% coinsurance, and an $8,500 out-of-pocket maximum, which is the 2026 legal ceiling. The employer contributes $690, the KFF average. The PPO costs $2,400 a year, has a $1,000 deductible, the same 20% coinsurance, and a $3,000 out-of-pocket maximum.
Say you contribute $2,600 to the HSA by payroll deduction and your combined marginal rate is 29.65%, which is a 22% federal bracket plus 7.65% in payroll tax. That saves $771.
Add up the HDHP’s head start: $1,200 of premium savings, $690 from the employer, $771 in tax, for $2,661 before you have seen a doctor.
The out-of-pocket maximums differ by $5,500. Subtract the $2,661 and the worst the HDHP can cost you is $2,839 more than the PPO. So a crossover exists.
Where? The PPO’s ceiling binds at $11,000 of allowed charges. Up through that point the HDHP is cheaper, by $2,661 at zero spending and by $741 through the middle band. The crossover lands around $14,700 of allowed charges, and above that the PPO wins, capping out at $2,839 better in the worst case.
Which means the honest summary is this: on that pair, the PPO is a $2,839 insurance policy against a specific scenario, and you pay $2,661 a year for it whether the scenario happens or not.
The tax detail, stated correctly
HSA contributions made by payroll deduction run through a Section 125 cafeteria plan, and IRS Publication 15-B confirms they are exempt from federal income tax withholding, Social Security tax, Medicare tax and federal unemployment tax. A contribution you write a check for later is deductible on Form 8889 but does not escape payroll tax. That is a real 7.65% difference, and it is a reason to fund the account through payroll rather than in a lump sum at tax time.
One correction to a claim you will see repeated: this is not an advantage over a health FSA. An FSA salary reduction uses the same cafeteria plan mechanism and also avoids payroll tax. The HSA’s genuine edges over an FSA are the higher limit, no use-it-or-lose-it deadline, portability when you leave, and the ability to invest the balance.
Two rules that bite if your circumstances change. Once you enroll in Medicare, your contribution limit is zero for that month onward, and it applies to retroactive Medicare coverage too, which can turn past contributions into excess contributions. And if you use the last-month rule to contribute a full year’s worth after enrolling mid-year, the testing period runs through December 31 of the following year; fail it and the excess is taxable plus a 10% additional tax.
Who actually gets hurt by choosing the HDHP
The plan only works if the account gets funded, and for a lot of people it does not.
KFF found that among covered workers in HSA-qualified high-deductible plans, 14% with single coverage and 15% with family coverage receive no employer account contribution at all, and a quarter receive under $400 for single coverage. Strip the employer seed out of the four-term formula and the HDHP’s head start shrinks to the premium difference plus the tax saving.
Devenir’s year-end 2025 research found 41.7 million HSAs holding $173.8 billion, with an average balance of $5,336 among funded accounts, and 22% of all accounts holding zero or a negative balance. Roughly one account in five is an empty shell.
If you cannot put money in, you have bought the deductible without the offset. That is the scenario where a PPO is the right answer, and it has nothing to do with how healthy you are.
What to do this week
Open your enrollment portal and write down six numbers for each plan: the annual premium you pay, the deductible, the coinsurance percentage, the out-of-pocket maximum, the employer HSA contribution, and the family versions if relevant.
Then do the single subtraction that matters. Take the difference in out-of-pocket maximums and subtract the premium difference, the employer contribution, and roughly 30% of whatever you realistically plan to contribute. If the answer is negative, the HDHP wins no matter what happens to your health this year.
And be honest about the funding question before you decide, because the HDHP vs PPO comparison assumes you will actually put money in the account. If you know you will not, choose accordingly. While you are in the portal, the supplemental policies on offer deserve the same arithmetic, and the rest of the open enrollment checklist covers what else is worth changing.
