How it works
An HDHP-versus-PPO break-even analysis replaces open-enrollment folklore with one number: the annual billed claims at which the high-deductible plan's total cost crosses under the PPO's. The mechanics run piecewise. Below its deductible you pay everything in either plan, but the HDHP's deductible is taller while its premium is lighter — so healthy years belong to whichever premium gap beats the extra deductible exposure. In mid-range years the plans diverge fastest: the PPO charges its deductible plus a coinsurance share on top, while most HDHPs drop to zero cost-share once their single deductible clears, so the HDHP curve flattens early and hard. In catastrophic years both plans pin you near their caps, and the lower total of premium plus out-of-pocket maximum wins — which is frequently the HDHP again, a result that surprises shoppers comparing premiums alone. The calculator solves the crossing point exactly rather than eyeballing it, and reports each plan's worst-case year as the honest ceiling. Two adjustments sharpen the verdict further: an HSA contribution sheltered at your marginal rate claws back real tax dollars in every scenario, and unspent HSA balances roll forward as owned savings — neither detail appears in either plan's brochure. Plan designs vary enormously between employers, so feed this your actual summary-of-benefits numbers rather than category averages.
Formula
HDHP(x) = premium + min(x, deductible) | PPO(x) = premium + min(OOP max, deductible + (x - deductible) x coinsurance) | solve HDHP(x) = PPO(x)
Tips
- Run the worst case too — the cheaper premium-plus-maximum is usually the safer plan in a bad year.
- Fund the HSA with the premium savings before judging either plan; the tax shield moves the break-even.
- Preventive care is covered before the deductible on HDHPs by law, so healthy-year costs sit closer than they look.
- Check whether your HDHP truly pays 100% post-deductible; some charge coinsurance past a second tier.
- Re-run every open enrollment — premiums drift faster than deductibles and flip these crossings.
Frequently asked questions
- Is an HDHP better than a PPO?
- It depends entirely on your expected care. Low-spending years favor whichever premium is lower — usually the HDHP decisively. Catastrophic years often favor the HDHP too, since premium plus out-of-pocket maximum decides. The PPO typically wins in the middle band of steady moderate care, which is precisely what this break-even quantifies.
- How much money should I put in my HSA?
- At minimum whatever you would realistically pay out of pocket in a bad-but-not-catastrophic year; ideally up to the IRS limit, since contributions dodge income tax going in and growth compounds untaxed. Contributing through payroll skips FICA as well, and unlike FSA money, unspent balances roll forward forever.
- What happens when I hit my out-of-pocket maximum?
- The plan pays 100% of covered in-network costs for the remainder of the year. Deductibles, copays and coinsurance all count toward the maximum; premiums never do. Both plan types have one — compare each plan's premium plus maximum as its true worst case before choosing between them.
- Why do high-deductible plans win in catastrophic years?
- Because those years push both plans to their respective ceilings anyway, and ceiling comparison is premium plus out-of-pocket maximum. When the HDHP's lighter premium more than offsets any gap between the two maximums, the cheap-premium plan wins even the worst year outright — counterintuitive, but arithmetically routine.
- Can I have an HSA with a PPO?
- Generally no: contributing to an HSA requires an HSA-qualified high-deductible health plan as your only coverage, which standard PPOs are not. A few employer designs qualify; verify the plan's status explicitly. An FSA is a different animal entirely and pairs with almost any traditional plan.