The cost difference comes less from the health savings account (HSA) itself and more from the high-deductible health plan (HDHP) that an HSA requires. Employers offering an HSA-qualified HDHP usually pay lower premiums than employers keeping a PPO or POS plan. That premium gap narrows, disappears, or even reverses once you add employer HSA contributions, payroll tax treatment, enrollment mix, and whether the plan is fully insured or self-funded.
The baseline matters. KFF's 2025 Employer Health Benefits Survey put average family premiums at $26,993, up 6 percent from the year before, and U.S. health spending reached $15,474 per person in 2024. An HSA-qualified plan changes the first-dollar cost structure, but it does not change provider prices.
Where the cost difference shows up
An HSA is a tax-advantaged account. The plan underneath it must be an HDHP with a deductible high enough to meet IRS rules: at least $1,700 for self-only coverage and $3,400 for family coverage in 2026. That design moves the first several thousand dollars of annual care onto the employee, and the employer pays a lower premium in exchange. For a fully insured plan, the savings show up on the monthly invoice. For a self-funded plan, the employer carries less first-dollar claim exposure but still carries stop-loss premiums and catastrophic claims.
- Premium: HSA-qualified HDHP premiums run lower than comparable PPO premiums because members pay more out of pocket before the plan pays.
- Employer HSA contributions: Many employers add seed money or match employee deposits. These dollars are a direct cost. Employer HSA contributions, and employee pre-tax HSA elections made through a Section 125 cafeteria plan, avoid the employer share of FICA, which is 7.65 percent on wages up to the Social Security wage base and 1.45 percent above it, plus FUTA.
- Claims: Members with first-dollar exposure often reduce discretionary care, but some employees defer needed care and later need higher-cost acute treatment.
- Administration: HSA accounts add recordkeeping, education, and compliance checks. These costs are usually small compared with premium and claims changes.
Premium savings are not the same as total savings
KFF's Employer Health Benefits Survey has long shown lower average premiums for HDHP/SO plans than for PPO plans. In 2025, average single-coverage premiums ran $8,620 for HDHP/SO plans against $9,818 for PPOs, and family coverage ran $25,379 against $28,272. KFF's HDHP/SO category covers high-deductible plans paired with either an HSA or a health reimbursement arrangement. But the published premium gap narrows once employer HSA contributions are counted. An employer that contributes a fixed amount per employee to an HSA can offset part of the premium reduction before a single claim is filed.
Firms that offer an HSA-qualified HDHP with no employer contribution typically see the largest immediate premium reduction. Firms that contribute generously trade some premium savings for recruitment and retention value, and the HSA balance belongs to the employee immediately. Firms that do not offer an HSA keep higher premiums but avoid the risk that employees defer care under a high deductible.
How plan funding and workforce health change the answer
Fully insured employers see the premium difference directly. Self-funded employers see it in claims. An employer that moves from a PPO to an HSA-qualified HDHP and funds the HSA heavily can spend about the same as before in year one. The longer-term difference depends on whether employees get preventive care, manage chronic conditions, and avoid avoidable claims.
HSA-qualified HDHPs must cover preventive services before the deductible under ACA rules. Even so, about 1 in 3 adults, 36 percent in KFF polling, say they skipped or postponed care because of cost in the past year. Raising the deductible without a first-dollar preventive layer can push that number higher. Only about 8 percent of adults 35 and older received all recommended preventive services in a 2015 analysis, and federal tracking shows the share fell to 5.3 percent by 2020. A design that increases cost sharing can make those numbers worse.
The premium gap is a cost shift to employees
The lower employer premium on an HSA-qualified HDHP comes mostly from members paying more out of pocket before the plan pays. In 2025, KFF found 72 percent of covered workers with single coverage facing an out-of-pocket maximum above $3,000, and one in five facing more than $6,000. The average worker put $6,850 toward family coverage that year. The shift lands unevenly. At firms with many low-wage workers, 43 percent of workers have employer health benefits, compared with 64 percent at firms with few low-wage workers. An employee who cannot afford to fund an HSA gets the higher deductible without the tax-advantaged account. A decision that counts only the premium reduction is counting a cost transfer as a cost saving.
The variables that determine the cost gap
The cost gap turns on how the plan changes care use before the deductible and whether the employer puts a first-dollar, preventive layer in front of the HDHP. An estimated 20 to 25 percent of U.S. health spending is waste. HSAs can reduce some discretionary spending, but they do not change hospital charges, billing codes, or pharmacy benefit manager (PBM) markups.
WellthCare™ addresses that gap from the other side. It works alongside the employer's existing plan, including an HSA-qualified HDHP, and gets used first. Employees receive $0-co-pay preventive care, earn reward dollars at the WellthCare Store™, and build retirement savings through verified preventive actions. The employer keeps the HSA design if it wants it. Employees use WellthCare first, so they do not spend down the HSA deductible on preventive care. That changes the claims curve in a way the HSA alone cannot.
If you are weighing an HSA-qualified HDHP against your current plan, model the premium savings, the HSA contribution budget, and the expected claims under each design before you decide. The HSA changes who pays first; it does not change what providers charge.
This article is for general information only and is not legal, tax, or medical advice. Employers should consult their own advisors.