HDHP vs PPO: The Break-Even Math for 2027 Open Enrollment

Nearly half of all U.S. health spending comes from just 5% of people, while the healthiest half of the population accounts for only about 3%, according to Peterson-KFF Health System Tracker data. That lopsided split is the whole story behind the HDHP vs PPO decision you’ll face this open enrollment season. This guide walks through how each plan works, a side-by-side comparison table, a break-even formula you can run with your own plan documents in ten minutes, and the specific situations where each plan clearly wins.

Most people pick a health plan the same way they picked it last year. That’s not laziness; it’s the status quo bias that quietly steers so many financial decisions. But premiums, deductibles, and the rules around health savings accounts all changed for 2027, so last year’s answer may not be this year’s.

HDHP vs PPO: What You’re Actually Choosing Between

A PPO (preferred provider organization) is the traditional plan most people picture: higher paycheck premiums, lower deductible, and often flat copays for office visits and prescriptions. It remains the most common choice. In the KFF 2025 Employer Health Benefits Survey, 46% of covered workers were enrolled in a PPO.

A high-deductible health plan (HDHP) flips the trade-off: lower premiums, a bigger deductible you pay before most coverage kicks in, and eligibility to contribute to a health savings account (HSA). KFF found 33% of covered workers were in an HDHP paired with a savings option in 2025, up substantially over the past decade.

The premium gap is real. KFF reported average total annual premiums (employer plus worker share) of:

Source: KFF 2025 Employer Health Benefits Survey. How much of that gap reaches your paycheck depends on your employer’s contribution split.

The 2027 HDHP and HSA Rules You Need to Know

For a plan to qualify as an HSA-eligible HDHP, it has to meet IRS thresholds that adjust every year. The IRS released the 2027 figures in Revenue Procedure 2026-24 in May 2026:

The One Big Beautiful Bill Act also widened the HSA door. Per IRS guidance, telehealth coverage before the deductible no longer disqualifies you from contributing, bronze and catastrophic marketplace plans count as HSA-compatible starting in 2026, and certain direct primary care arrangements no longer block HSA eligibility. If you buy your own coverage, that last group of changes matters a lot, and it pairs with the self-employed health insurance deduction rules covered separately.

The HSA is what makes the HDHP interesting. Contributions go in pre-tax, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. If that’s new to you, start with our explanation of the HSA triple tax advantage.

The Break-Even Formula: Worst Case First

Here’s the shortcut most comparisons skip. Before modeling any “typical” year, check the worst case:

If (annual premium savings + employer HSA contribution) ≥ (HDHP out-of-pocket max − PPO out-of-pocket max), the HDHP costs less at every level of medical spending.

Why? At low spending, the HDHP wins on premiums. At catastrophic spending, both plans hit their out-of-pocket caps, so the only question left is whether the premium savings and employer seed money cover the gap between the two caps. If they do, there is no year in which the PPO comes out ahead on pure dollars.

If the formula fails, the PPO wins somewhere in the middle or high end, and you need the scenario math below.

Example 1: Single employee (the HDHP sweeps)

These plan numbers are illustrative, but typical of what shows up in a benefits portal. The PPO costs $150 a month in premiums with a $1,000 deductible and $4,000 out-of-pocket max. The HDHP costs $60 a month with a $2,500 deductible, $5,000 max, and a $500 employer HSA contribution. Both plans use 20% coinsurance after the deductible.

Worst-case test: $1,080 in premium savings + $500 seed = $1,580, which beats the $1,000 gap between out-of-pocket maximums. The HDHP should win everywhere. Let’s confirm:

Net cost = annual premiums + out-of-pocket spending − employer HSA contribution. Before any tax savings. Assumes all services apply to the deductible.

And that’s before taxes. Money you run through an HSA via payroll skips federal income tax and, when contributed through an employer cafeteria plan, the 7.65% FICA tax too. For someone in the 22% bracket, every out-of-pocket dollar paid from the HSA effectively costs about 70 cents.

Example 2: Family coverage (the PPO wins the middle)

Now a family. The PPO runs $500 a month with a $2,000 deductible and $8,000 max. The HDHP runs $420 a month with a $5,000 deductible, $14,000 max, and a $1,000 employer HSA contribution.

Worst-case test: $960 in premium savings + $1,000 seed = $1,960, far short of the $6,000 gap between maximums. The formula fails, so let’s see where the lines cross:

Pre-tax, the break-even sits a little under $5,000 of claims. Taxes muddy it in a useful way. At $8,000 of claims, the HDHP family pays $6,000 out of pocket, $5,000 of it after the employer seed. Running that $5,000 through the HSA at a combined 29.65% (22% federal + 7.65% FICA) saves about $1,480, dropping the HDHP’s net cost to roughly $8,160. But the PPO family can use a health FSA (the 2026 limit is $3,400) to pay its $3,200 out-of-pocket pre-tax, saving about $950 and landing near $8,250. Once both families use their tax tools, the $8,000 year is roughly a tie.

The lesson: the “HDHPs are for healthy people” rule of thumb is too crude. Plan design and employer contributions matter more than your health.

Pros and Cons of an HDHP

Pros:

• Lower premiums. KFF’s data shows average single HDHP premiums about $1,200 below PPO premiums.
• HSA access. The only account with a tax break on the way in, while invested, and on the way out for medical costs. Unlike an FSA, unused money never expires; our HSA vs FSA comparison covers the differences in detail.
• A stealth retirement account. Fidelity’s 2026 Retiree Health Care Cost Estimate puts lifetime retiree health spending at $185,500 for a 65-year-old individual. An invested HSA is the most tax-efficient way to pre-fund that.
• Preventive care stays free. HDHPs must cover ACA preventive services before the deductible.

Cons:

• Cash-flow shock. A January ER visit can mean paying the full deductible before your HSA has filled up. Your emergency fund priorities need to account for that.
• Employer seed money is usually small. KFF found only 3% of workers in HSA-qualified plans get an employer contribution at least as large as their single deductible.
• Care avoidance. Research has repeatedly found that people facing high deductibles cut back on care, including care they need. A plan that’s cheaper on paper isn’t cheaper if it makes you skip the visit that catches something early.

Pros and Cons of a PPO

Pros:

• Predictable costs. Copays make routine care easy to budget.
• Lower worst case. PPO out-of-pocket maximums are often thousands below the HDHP’s in the same employer lineup.
• Better for known, recurring expenses. Ongoing specialty drugs, therapy, or a planned birth often favor the lower deductible.

Cons:

• Higher guaranteed cost. You pay the extra premium whether you use care or not.
• No HSA. A health FSA offers pre-tax spending, but most of it is use-it-or-lose-it, and it can’t be invested for retirement.

I run this comparison every fall with a small script that pulls the numbers from my plan summaries and sweeps claim levels from zero to catastrophic. It’s the kind of thing software engineers automate out of habit. The first time I did it, I was surprised by how often the “worst-case first” check answered the whole question in one line. I’ve been on an HDHP for years, investing the HSA in a total-market index fund and paying most small bills out of pocket so the account compounds. That only works because I keep a separate cash buffer for the deductible; I track it as its own line in my sinking funds.

HDHP vs PPO: Which Should You Choose?

Lean HDHP if:

• The worst-case formula passes (premium savings + HSA seed ≥ difference in out-of-pocket max).
• You can cover the full HDHP deductible from savings without touching a credit card.
• You’d actually fund and invest the HSA, not just open it.
• You’re self-employed or buying marketplace coverage and can now pair a bronze plan with an HSA.

Lean PPO if:

• The formula fails and you expect claims in the middle band where the PPO wins, such as a planned surgery, pregnancy, or chronic condition.
• A surprise deductible would push you into debt.
• You know the higher deductible would make you delay care.
• Your employer’s HDHP has a much narrower network or excludes a doctor you rely on.

Pull the Summary of Benefits and Coverage for each plan, grab your per-paycheck premiums, and run three numbers: low year, expected year, worst case. Ten minutes of math during open enrollment can be worth more than a year of clipping coupons.

Frequently Asked Questions

Is an HDHP always cheaper than a PPO for healthy people?

Usually, but not always. If your employer’s HDHP premium is barely below the PPO’s and it offers no HSA contribution, a healthy person saves little and takes on more risk. Run the worst-case test: premium savings plus employer HSA money versus the gap in out-of-pocket maximums.

What is the HSA contribution limit for 2027?

$4,500 for self-only HDHP coverage and $9,000 for family coverage, plus a $1,000 catch-up if you’re 55 or older, per IRS Revenue Procedure 2026-24. Employer contributions count toward the limit.

Can I have an FSA and an HSA at the same time?

Not a general-purpose health FSA. You can pair an HSA with a limited-purpose FSA that covers only dental and vision expenses, which some employers offer alongside their HDHP.

What happens to my HSA if I switch back to a PPO?

The money stays yours. You can’t make new contributions while you’re not covered by an HSA-eligible plan, but you can keep the account invested and withdraw tax-free for qualified medical expenses at any time.

Do PPO copays count toward the deductible?

It depends on the plan. Many PPOs charge flat copays for office visits that don’t apply to the deductible but do count toward the out-of-pocket maximum. Check your Summary of Benefits and Coverage, since this changes the break-even math.

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Written by Chris Steve

Chris Steve is a software engineer with a deep interest in personal finance, behavioral economics, and AI. He started Money & Planet to share clear, research-backed money guides — the kind that explain the math instead of pushing products. His writing focuses on long-term wealth building, the psychology behind spending and investing decisions, and the practical tools regular people can use to make smarter financial choices.