HDHP vs. PPO for 2027: How to Run the Real Plan-Cost Math

Last October, a friend I'll call Dana sat at her kitchen table with two health-plan options from her employer's open enrollment portal and picked the wrong one. She chose the PPO, the plan with the comfortable-sounding $2,000 family deductible, because the other option had "high-deductible" stamped on it and a $3,500 deductible that made her stomach drop. That one click cost her household close to $3,900 over the next year. (Dana's a composite, but every number around her is real.)

The plan that looks scarier on paper is, for a lot of families, the one that quietly leaves more money in your pocket. Not always. But the "high-deductible" label does so much work scaring people off that most people never run the comparison that would tell them the truth.

Open enrollment season is about to start landing in inboxes. Employers usually roll out their 2027 elections between late September and November, and the IRS has already locked in the numbers that make one side of this decision work. So this is the right moment to learn how to actually compare the two, before you're staring at a portal with a deadline and picking the plan whose name sounds safest.

Why "high deductible" scares people off the cheaper plan

A high-deductible health plan, or HDHP, is exactly what it sounds like: you pay more out of pocket before insurance starts covering costs. A PPO typically has a lower deductible, so coverage kicks in sooner. Looked at through that single window, the PPO obviously wins. Lower deductible, less risk, done.

The problem is that the deductible is one number on a page with about six numbers that matter. The PPO buys you a lower deductible by charging you a higher premium every single paycheck, whether you see a doctor or not. The HDHP does the reverse: a bigger deductible, but a smaller premium and, crucially, access to a Health Savings Account that the PPO doesn't offer.

That HSA is the whole game, and it's why these two plans aren't really the same product with different deductibles. They're two different financial strategies.

Nearly three in ten covered workers, 29%, are now enrolled in an HDHP that qualifies for an HSA, according to KFF's 2025 Employer Health Benefits Survey. So this isn't a fringe option anymore. It's a mainstream choice that a lot of people make by reflex instead of by math.

What the HDHP actually hands you

There are three things the low premium is buying back for you. None of them shows up when you're comparing deductibles side by side.

A fatter paycheck all year

The premium gap between the two plans is real money, and it's usually the biggest single number in this whole comparison. In Dana's case, the PPO cost her $7,200 a year out of her own paycheck; the HDHP cost $4,800. That's $2,400 a year, or $200 a month, that stays in her checking account for simply choosing the plan with the scarier name.

For context, the average family premium for employer coverage hit $26,993 in 2025, with workers paying $6,850 of that out of pocket, per KFF. HSA-qualified plans run cheaper than average, with family premiums around $25,379. The premium savings on the HDHP side aren't a rounding error. For most families they're the down payment on the entire strategy.

Free money from your employer

Many employers sweeten the HDHP by dropping money straight into your HSA to help cover that bigger deductible. Dana's employer seeded hers with $1,500 a year. That's not a loan or a match you have to earn. It's cash that lands in an account with your name on it.

One honest caveat: not every employer does this, and the ones that do often seed only part of the deductible. Only about 3% of workers in an HSA-qualified plan get an employer contribution equal to or larger than their whole deductible, KFF found. So check your own plan documents for the exact figure rather than assuming. But if your employer offers a seed, count every dollar of it as a direct discount on the HDHP.

The best tax shelter most people ignore

This is the part that turns a decent deal into a great one. An HSA gives you a triple tax break found almost nowhere else in the tax code: money goes in tax-free, grows tax-free, and comes out tax-free when spent on qualified medical care.

For 2027, the IRS is letting families put away up to $9,000 in an HSA, up from $8,750 in 2026, under the limits released in Revenue Procedure 2026-24 this past May. Self-only coverage gets a $4,500 cap, and anyone 55 or older can add another $1,000 on top. Those limits count your money and your employer's seed together, so if your company puts in $1,500, you can add up to $7,500 yourself.

Here's why that shelter matters in dollars. If Dana routes $5,000 through payroll into her HSA, and she's in the 22% federal bracket, she skips both income tax and the 7.65% payroll tax on that money. That's about $1,480 she doesn't hand to the government, before any state tax break. The PPO gives her no way to do this at all.

The actual math, one healthy year and one terrible one

Numbers beat vibes, so put the two plans through the two scenarios that matter: a normal year and a disaster year. Dana's family plans looked like this. The PPO: $7,200 in premiums, a $2,000 deductible, a $6,000 out-of-pocket maximum. The HDHP: $4,800 in premiums, a $3,500 deductible, a $10,000 out-of-pocket maximum, plus the $1,500 employer seed.

In a healthy year, say the family spends $1,000 on care, the PPO costs $7,200 in premiums plus $1,000 in care, or $8,200. The HDHP costs $4,800 plus $1,000, minus the $1,500 seed, which nets out to $4,300. The HDHP wins by $3,900. That's the money Dana left on the table.

Now the nightmare year, where someone gets seriously sick and the family blows through its out-of-pocket maximum. The PPO costs $7,200 in premiums plus its $6,000 cap, for $13,200. The HDHP costs $4,800 plus its $10,000 cap, minus the $1,500 seed, for $13,300.

Look at that spread. In a good year the HDHP saves the family roughly $3,900. In their worst imaginable year it costs them about $100 more. Big savings almost every year, a rounding error in the one catastrophic year. That asymmetry is the entire case for the high-deductible plan, and it's completely invisible if you only compare deductibles.

The messy middle, a year with a few thousand dollars of care, depends on your plan's coinsurance and copays, so run your own numbers there. But the two bookends tell you which direction the plan leans.

When the PPO really is the smarter pick

I don't want to sell you an HDHP, because for some households it's clearly the wrong call. The comparison flips when a few things are true.

If your HDHP comes with no employer seed, only a small premium discount, and a high out-of-pocket maximum, the safety cushion shrinks and the PPO's lower ceiling starts to win. Rerun Dana's math with a zero-dollar seed and a $200 premium gap and the answer changes completely.

If you already know you'll spend heavily and predictably, the PPO can also come out ahead. An expensive ongoing prescription, a planned surgery, a baby due next spring, or a chronic condition that guarantees you hit the deductible every year all tilt the decision toward the plan that starts covering costs sooner.

And there's a cash-flow point that pure math misses. An HDHP can hand you a $3,500 bill in January before your HSA has much in it. If covering that from savings would really hurt, the PPO's predictable, spread-out cost has real value even if it's a little more expensive on paper. Peace of mind is a legitimate thing to buy.

The mistake that quietly ruins the HDHP math

Here's the trap. Plenty of people pick the HDHP for the lower premium, pocket the difference as extra spending money, and never fund the HSA or spend it the moment it hits. They took on the bigger deductible risk and threw away the tax-advantaged savings that was supposed to pay for it.

The HDHP only wins if you actually move the premium savings into the HSA and leave it there to do its job. Choose the high-deductible plan and skip the account, and you've bought the risk without the reward. That's the worst of both worlds, and it's the single most common way this strategy backfires.

If you can swing it, the power move is to pay small medical bills out of your regular checking account and let the HSA grow, invested, for years. That turns it into a stealth retirement account with a better tax deal than a 401(k).

Bottom Line

The scariest number on a health plan is the deductible, but it's rarely the number that decides which plan costs you more. The premium gap, the employer seed, and the HSA tax break usually swing the answer, and all three favor the high-deductible plan for families who can cover a bad month.

When your 2027 open enrollment window opens, do this:

1. Pull both plans' four key numbers side by side: your share of the annual premium, the deductible, the out-of-pocket maximum, and any employer HSA contribution. Ignore the plan names while you do it.
2. Run the two bookend scenarios on paper. Add up total yearly cost in a healthy year (premiums plus a small care estimate, minus the employer seed) and in a max-out year (premiums plus the out-of-pocket cap, minus the seed). See which plan wins each.
3. If the HDHP comes out ahead, commit to moving at least the premium savings into your HSA through payroll, where it dodges income and payroll tax. The plan only pays off if you fund the account.
4. If you have predictable heavy medical spending next year, or couldn't absorb a surprise deductible from savings, take the PPO without guilt. The math and your cash flow both point there.

Twenty minutes with a calculator during open enrollment can be worth a few thousand dollars a year. That's about the best hourly rate you'll find all season.