HSA eligibility rules
Last updated August 2026
Short answer
Eligibility is where HSAs get fiddly, and it is worth understanding precisely, because the penalty for contributing while ineligible falls on you rather than on whoever set up the plan.
What makes a plan qualify in 2026
| Requirement | Self-only | Family |
|---|---|---|
| Minimum deductible | $1,700 | $3,400 |
| Maximum out-of-pocket | $8,500 | $17,000 |
| HSA contribution limit | $4,400 | $8,750 |
Both tests must be met. A plan with a $2,000 deductible but a $9,500 out-of-pocket maximum does not qualify in 2026, however high the deductible sounds.
A qualifying plan may still cover preventive care before the deductible, and many do. That does not break eligibility.
Your insurer or HR can confirm whether a plan is HSA-qualified, and it is usually labelled as such in enrollment materials. Do not infer it from the deductible alone.
Other coverage that disqualifies you
The rule is that you must have no health coverage other than the high-deductible plan. Several common things count:
A general purpose health FSA. The most frequent disqualifier. It counts as other coverage even if the balance is zero and you never file a claim.
Your spouse's general purpose FSA. Because it can usually reimburse your expenses, it can disqualify you even though you are not enrolled in it. Couples often discover this after the fact.
A spouse's non-HDHP family plan that also covers you.
TRICARE, and being a veteran who has received VA medical benefits within the previous three months, with an exception for service-connected disability care.
What does not disqualify you: dental and vision plans, disability and long-term care insurance, accident coverage, and a limited purpose FSA restricted to dental and vision. That last one is the standard workaround for couples who want both.
Medicare, and the six-month lookback
Enrolling in any part of Medicare ends your ability to contribute from the first of that month. You keep the account and can spend it, but new contributions must stop.
The detail that causes real problems: if you enroll after 65, Part A can be backdated up to six months. Anyone who kept contributing during those retroactive months has made excess contributions and has to unwind them.
The usual approach for people working past 65 is to stop contributions six months before enrolling. If you are in that position it is worth confirming the timing with your benefits team rather than estimating.
Eligibility is monthly, not annual
It is assessed on the first day of each month, and your annual limit is prorated by the number of eligible months. Switching from a qualifying plan to a traditional one in July gives you six eligible months and half the annual limit, unless you use the last-month rule.
This also means you do not lose the account when you become ineligible. You simply stop contributing. The balance stays invested, still grows untaxed, and can still be spent tax free on qualified expenses.
Try it in Walnut
If your HSA is invested at a brokerage, Walnut can read those holdings with the rest of your accounts so it is part of one allocation rather than a separate portal.
Whether the plan is right for you is a separate question
Being eligible is not the same as being better off. A high-deductible plan shifts risk to you in exchange for lower premiums and the tax break. For someone with low and unpredictable medical spending that is usually a good trade. For someone with a chronic condition and predictable high costs it often is not, even after the tax advantage.
The honest comparison is total expected cost, premiums plus expected out-of-pocket spending minus the tax saving, not the tax advantage alone.
Sources
2026 plan thresholds are from IRS Revenue Procedure 2025-19. Eligibility conditions, disqualifying coverage and the Medicare interaction are in IRS Publication 969. Walnut is informational and is not an investment adviser. This guide is educational and not personalized tax or investment advice; anything with a tax consequence is worth confirming with a tax professional.
FAQ
Who is eligible to contribute to an HSA?
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Four conditions must all hold. You are covered by a qualifying high-deductible health plan, you have no other disqualifying health coverage, you are not enrolled in Medicare, and nobody claims you as a dependent on their tax return. Eligibility is tested on the first day of each month.
What makes a health plan HSA-qualified in 2026?
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A minimum deductible of $1,700 for self-only coverage or $3,400 for family coverage, and out-of-pocket maximums no higher than $8,500 and $17,000 respectively. A high deductible alone is not enough: the plan must also meet the out-of-pocket cap, and preventive care may be covered before the deductible.
Does a general purpose FSA disqualify me from an HSA?
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Yes, and it is the most common disqualifier. A general purpose health FSA counts as other coverage even if you never use it, and a spouse's FSA can disqualify you too because it can typically reimburse your expenses. A limited purpose FSA restricted to dental and vision does not disqualify you.
Can I contribute to an HSA if I am on Medicare?
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No. Enrolling in any part of Medicare ends your eligibility to contribute, though you keep the account and can still spend the balance. Part A can be backdated up to six months when you enroll after 65, so contributions in those months can become excess. Many people stop contributing six months before enrolling.