HDHPs and HSAs: an employer guide with 2026 limits

A high-deductible health plan (HDHP) pairs a lower premium with a deductible of at least $1,700 for self-only coverage and $3,400 for family coverage in 2026. An employee enrolled in a qualifying HDHP, with no disqualifying other coverage, can open a health savings account and contribute up to $4,400 (self-only) or $8,750 (family) for 2026, with an extra $1,000 for age 55 and older. The employer can contribute too, and the money belongs to the employee.

2026 IRS limits at a glance

These are the figures in IRS Rev. Proc. 2025-19, applicable to calendar year 2026.

The catch-up amount is set by statute and is not indexed (IRS Publication 969). The out-of-pocket maximum counts deductibles, copays and coinsurance but not premiums. The HDHP ceiling is a tax-law test and is separate from the ACA out-of-pocket limit that applies to non-grandfathered plans, so a plan must meet both.

What makes a plan an HDHP

A plan must meet the deductible and out-of-pocket tests above, and must not pay for most care before the deductible. The exceptions are preventive care, which may be covered first-dollar, and a few safe harbors. Telehealth is one. The 2025 federal tax law (P.L. 119-21, the One Big Beautiful Bill Act) made permanent the safe harbor that lets an HDHP cover telehealth before the deductible, for plan years beginning after December 31, 2024, according to IRS Notice 2026-5. The same law and notice treat any bronze or catastrophic plan available as individual coverage through an Exchange as an HDHP for months beginning after December 31, 2025, and allow a direct primary care arrangement to coexist with an HSA if fees stay at or under $150 a month ($300 for more than one person).

A family HDHP can use an embedded individual deductible only if the embedded amount is at least the family minimum. Many carriers sell embedded designs that fail the test, so ask for the HSA-qualified label in the plan documents, not the sales deck.

Employee eligibility traps

An employee cannot contribute to an HSA while covered by other non-HDHP health coverage, including a spouse's general-purpose health FSA, or once enrolled in any part of Medicare. Someone turning 65 who takes Social Security benefits is automatically enrolled in Part A, and HSA contributions must stop. Your payroll team should flag these. A general-purpose health FSA or a standard health reimbursement arrangement offered to the employee also disqualifies them. A limited-purpose FSA (dental and vision only) or a post-deductible HRA is fine.

The "last-month rule" lets someone who is HSA-eligible on December 1 contribute the full annual limit, but they must remain eligible through the following year's testing period or face tax and a 10% additional tax on the excess. This matters for employer-side proration when someone joins mid-year.

Employer contribution rules

Employers can fund HSAs, and contributions made through a cafeteria plan avoid payroll tax for both sides. Three rules matter.

1. Comparability. Outside a cafeteria plan, the employer must make comparable contributions to all comparable participating employees (same coverage category, such as self-only or family). Failing this triggers a 35% excise tax on the amounts contributed (IRC 4980G). Contributions through a cafeteria plan are tested under the nondiscrimination rules instead.
2. Limit. Employer and employee money share the same annual cap above. If you contribute $1,000 to a self-only employee, that employee has $3,400 of room left in 2026.
3. Ownership. Funds are vested immediately and portable. You can't claw back money when an employee quits, and a forfeiture schedule isn't allowed.

Most HSAs are not subject to ERISA if the employer doesn't endorse the account and employees can choose any custodian. Endorsing a vendor or making contributions mandatory can pull the HSA into ERISA. Ask your benefits attorney about it where the arrangement is anything more than a payroll deduction.

Where HDHPs fit in the market

KFF's 2025 Employer Health Benefits Survey, released October 22, 2025, found that 33% of covered workers were in a high-deductible plan with a savings option (HDHP/SO). The average annual premium for covered workers in an HDHP/SO was $8,620 for single coverage and $25,379 for family, compared with $9,325 and $26,993 for all plan types. The average single deductible across all plans was $1,886. In KFF's data, 68% of covered workers at firms offering coverage work at a firm that offers at least one HDHP/SO.

Employers rarely adopt an HDHP just for a lower rate. The savings come from two places: a lower premium, and the fact that employees who own the money spend more carefully. The risk is that low earners skip care or can't fund the account. Cost shifting also moves exposure to the employee, which is why a funded HSA matters.

A hypothetical comparison

Say a 40-employee Georgia consulting firm pays $600 a month for each employee on a traditional plan and 80% of that comes from the employer. It gets a quote for an HSA-qualified HDHP at $480 a month and decides to pay the same 80% share plus a $1,200 annual HSA seed.

• Traditional plan, employer share: $600 x 80% x 12 = $5,760 per employee.
• HDHP employer share: $480 x 80% x 12 = $4,608, plus $1,200 HSA seed = $5,808.

The firm's year-one spend is about $48 per employee higher, but it buys something: the seed is a fixed, known amount, while the premium on the HDHP builds from a lower base at renewal. On the employee side, monthly premium falls $24 ($288 a year), but the deductible rises. An employee with a $3,000 claim who gets only the $1,200 seed carries $1,800 out of pocket on top of the lower premium. The firm should model this with the group health insurance cost and affordability calculator using its own quotes and claims experience.

Alongside other models

An HDHP/HSA design competes with ICHRA and with self-funded designs such as level-funded health plans: how they work, who they suit and the catches. A level-funded plan can also be paired with an HSA if the plan meets the HDHP tests. If renewals are the driver, why group health renewals rise and how to negotiate them explains the levers, and building an employee benefits package that fits your budget covers where an HSA fits in the whole package. State law rules may differ on small-group plan design and payroll treatment of HSAs; a few states do not follow federal tax treatment, so confirm with your CPA and see workers' comp and benefits requirements by state.

Checklist before you offer an HSA plan

1. Confirm in writing that the plan is HSA-qualified for 2026, including embedded deductible mechanics.
2. Decide on an employer seed and run it through a cafeteria plan to keep comparability simple.
3. Choose a custodian that integrates with payroll, and decide whether you endorse it.
4. Tell employees about Medicare, spouse FSA and tax-reporting (Form 8889) issues.
5. Tell employees how a limited-purpose FSA can be used alongside an HSA.
6. Set a calendar to re-check limits each fall, since IRS publishes next year's figures in the spring.

Key takeaways

• For 2026 an HSA-qualified HDHP needs a $1,700/$3,400 minimum deductible and an $8,500/$17,000 out-of-pocket maximum; HSA contribution limits are $4,400/$8,750 plus $1,000 catch-up.
• Employer contributions count against the employee's cap, vest immediately and must meet comparability rules unless made through a cafeteria plan.
• Medicare enrollment or a spouse's general-purpose FSA can disqualify an employee from contributing.
• KFF's 2025 survey found 33% of covered workers in an HDHP/SO; savings depend on plan design and on how much you seed.
• Model both employer and employee cost before switching, not just the premium.