High-Deductible Health Plans (HDHPs): 2026 Thresholds and HSA Rules

A high-deductible health plan qualifies under IRS rules only when its annual deductible and out-of-pocket maximum sit inside the specific window Congress and the IRS set each year. For 2026, that means a deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, and an out-of-pocket maximum no higher than $8,500 for self-only or $17,000 for family.¹² Meeting both tests is what makes the plan an HDHP, and HDHP enrollment is the gateway to a Health Savings Account.

The 2026 Thresholds a Plan Must Meet

A plan’s deductible cannot fall below the IRS floor by even a dollar. For 2026, the minimums are $1,700 (self-only) and $3,400 (family).¹ For 2025, they were $1,650 and $3,300. The IRS applies a cost-of-living adjustment each year, so the numbers move.

The out-of-pocket maximum runs the other direction: it is a ceiling the plan cannot exceed. For 2026, the caps are $8,500 (self-only) and $17,000 (family).² These numbers cover the deductible, copays, and coinsurance for in-network care. They do not include monthly premiums or costs for services the plan doesn’t cover. A plan that exposes a participant to more than these amounts for covered in-network care fails to qualify.

Family Coverage and Embedded Deductibles

The IRS treats family coverage as any plan covering at least one person besides the primary policyholder, so even a parent-plus-one-child plan must clear the $3,400 minimum.

If a family plan includes an embedded individual deductible, meaning a lower deductible that kicks in for a single family member before the full family deductible is met, that embedded amount must itself be at least $3,400. An embedded deductible set below the family minimum means the plan starts paying claims before the required deductible is satisfied, which disqualifies the entire plan as an HDHP.

What an HDHP Can Pay Before the Deductible

The general rule is that an HDHP pays nothing until you meet the deductible. Preventive care is the major exception. An HDHP can cover certain preventive services with no cost-sharing at all, and no deductible, without losing its qualifying status.³

The IRS reads preventive care broadly. It includes annual physicals, routine prenatal and well-child visits, immunizations for children and adults, tobacco cessation and weight-loss programs, and screening services for conditions like cancer, heart disease, and diabetes.⁴ Treatment for an existing illness or injury is not preventive care. A screening mammogram qualifies; treatment after a diagnosis generally does not.

Chronic Condition Safe Harbor

Since 2019, the IRS has allowed HDHPs to cover a narrow, specific list of medications and services before the deductible for people already diagnosed with certain chronic conditions:⁵

Diabetes: insulin, other glucose-lowering agents, retinopathy screening, glucometers, and hemoglobin A1c testing
Heart disease and coronary artery disease: ACE inhibitors, beta-blockers, statins, and LDL testing
Hypertension: blood pressure monitors
Asthma: inhaled corticosteroids and peak flow meters
Depression: SSRIs
Osteoporosis: anti-resorptive therapy
Liver disease and bleeding disorders: INR testing

The item must be prescribed specifically to prevent the chronic condition from worsening or triggering a secondary condition. Anything not on this list falls outside the safe harbor, even if it seems like a logical fit.⁵

What HDHP Enrollment Unlocks: The HSA

Qualifying HDHP coverage is what makes you eligible to fund a Health Savings Account. For 2026, you can contribute up to $4,400 with self-only HDHP coverage or up to $8,750 with family coverage.¹ The cap covers everything going into the account: your own contributions, employer contributions, and any deposits made through a cafeteria plan. Employer money doesn’t sit outside the limit; it eats into it.

If you’re 55 or older and not enrolled in Medicare, you can add an extra $1,000. That catch-up amount is fixed in the statute and doesn’t adjust for inflation.³ If both spouses are 55 or older and both are HSA-eligible, each can make a $1,000 catch-up contribution, but each must deposit it into a separate HSA in their own name.

HSAs carry a triple tax advantage. Contributions reduce taxable income or are excluded from it when made through payroll, the money grows tax-free inside the account, and withdrawals for qualified medical expenses are never taxed.

What Can Disqualify You From Contributing

Carrying an HDHP is necessary but not sufficient. You have to be covered under the HDHP on the first day of the month to contribute for that month, and you must clear several other hurdles.⁶

You cannot be covered by another health plan that pays benefits before the HDHP deductible is met. The most common trap is a general-purpose Flexible Spending Account through work, which reimburses medical expenses from dollar one and conflicts with the HDHP structure. Compatible alternatives exist: a limited-purpose FSA (dental and vision only), a post-deductible HRA that pays nothing until the HDHP minimum deductible is met, and separate coverage for accidents, disability, dental, vision, or long-term care.⁶ At open enrollment, the type of FSA matters. Enrolling in the wrong one kills HSA eligibility for the entire plan year.

Enrolling in any part of Medicare, including Part A alone, ends your ability to make HSA contributions starting the month Medicare coverage begins.⁶ This catches people who turn 65 and sign up for Part A while still working. Medicare enrollment can also be backdated, and contributions made during the retroactive coverage period become excess contributions.

You also cannot contribute if you can be claimed as a dependent on someone else’s tax return. The test is whether they are entitled to claim you, not whether they actually do.⁶

Contributing more than the limit, or contributing during months you’re ineligible, triggers a 6% excise tax that hits the excess every year it stays in the account.⁷ The fix is to pull the excess out (with any earnings on it) before you file that year’s return.

The Last-Month Rule and Its Testing Period

If you become HDHP-eligible partway through the year, the IRS normally prorates your contribution limit by the number of eligible months. The last-month rule offers a shortcut: if you’re an eligible individual on December 1, the IRS treats you as eligible for the whole year, letting you contribute the full annual amount.⁶

The catch is a testing period. You must stay HSA-eligible through December 31 of the following year. Use the rule for 2026 and you need qualifying HDHP coverage, plus every other eligibility requirement, through December 31, 2027. Fail the testing period for any reason other than death or disability, and the extra contributions allowed only by the rule get added back to your taxable income, with an additional 10% tax on top.⁶ Job changes that end HDHP coverage mid-year are where this rule bites hardest.

Getting the Money Back Out

Withdrawals for qualified medical expenses come out completely tax-free. Qualifying expenses track the medical expense deduction rules under the tax code and include doctor visits, prescriptions, surgery, dental work, and vision care.

Non-medical withdrawals get taxed twice. The amount goes into taxable income, and there’s an additional 20% tax on top.⁶ On a $5,000 non-medical withdrawal, someone in the 22% bracket loses $2,100: $1,100 in income tax plus $1,000 in penalty.

The 20% penalty disappears at 65, at disability, or at death. After 65, non-medical withdrawals are still taxed as ordinary income but look much like traditional IRA distributions.⁶ Qualified medical withdrawals stay tax-free at any age.

2026 HDHP and HSA Numbers at a Glance

Minimum annual deductible, self-only: $1,700¹
Minimum annual deductible, family: $3,400¹
Maximum out-of-pocket, self-only: $8,500²
Maximum out-of-pocket, family: $17,000²
HSA contribution limit, self-only: $4,400¹
HSA contribution limit, family: $8,750¹
HSA catch-up contribution, age 55 and older: $1,000³

1
Internal Revenue Service. Rev. Proc. 2025-19
2
Internal Revenue Service. Notice 2026-5
3
Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
4
Internal Revenue Service. Notice 2004-23
5
Internal Revenue Service. Notice 2019-45
6
Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
7
Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts