HSA Eligibility Rules: Who Qualifies

Health Savings Account (HSA) eligibility is governed by a specific set of federal requirements established under Internal Revenue Code Section 223, and failing to meet even one condition disqualifies an individual from making contributions for that period. These rules determine not only who can open an HSA but also how much can be contributed and when eligibility begins or ends. Understanding the precise boundaries matters because improper contributions trigger a 6% excise tax on the excess amount (IRS Publication 969).

Definition and scope

An HSA is a tax-advantaged account available exclusively to individuals enrolled in a qualifying High-Deductible Health Plan (HDHP). The account holder must meet four federal eligibility conditions simultaneously to contribute in any given month:

1. Covered by a qualifying HDHP — The individual must be enrolled in an HDHP that meets the IRS minimum deductible and maximum out-of-pocket thresholds for that tax year (IRS Revenue Procedure, updated annually).
2. Not covered by disqualifying coverage — The individual cannot be covered by any non-HDHP health plan, including a spouse's traditional PPO or HMO, that provides benefits before the HDHP deductible is met.
3. Not enrolled in Medicare — Enrollment in Medicare Part A, Part B, or Part D ends HSA contribution eligibility, even if the individual remains in an HDHP.
4. Not claimed as a dependent — The individual cannot be claimed as a dependent on another person's federal tax return for the year in question.

These four conditions apply on a month-by-month basis. An individual who loses eligibility in October, for example, may contribute for the months of January through September but not beyond, unless the last-month rule applies (discussed below).

The scope of this page is limited to contribution eligibility. Spending HSA funds follows a separate set of rules covered under HSA withdrawal rules and penalties.

How it works

Eligibility is evaluated on the first day of each month. If an individual is HDHP-enrolled and meets all four conditions on the first of a given month, that month counts as an eligible month for contribution purposes.

The last-month rule (also called the full-contribution rule) allows an individual who is HSA-eligible on December 1 to contribute the full annual limit for that year, regardless of how many months during the year they held qualifying coverage. However, the IRS imposes a testing period: the individual must remain HSA-eligible through December 31 of the following year. Failing to do so results in the excess contribution being included in gross income and subject to a 10% penalty tax (IRS Publication 969).

For 2024, the IRS set the minimum HDHP deductible at $1,600 for self-only coverage and $3,200 for family coverage, with out-of-pocket maximums capped at $8,050 and $16,100 respectively (IRS Rev. Proc. 2023-23). A plan that does not meet these thresholds is not a qualifying HDHP, and enrollment in it does not confer HSA eligibility.

For background on how the underlying HDHP structures work, the resource at /index provides a comprehensive entry point to HDHP and HSA topics. Additional detail on qualifying plan structures appears at IRS definition of an HDHP.

Common scenarios

Scenario 1 — Spouse covered by a traditional plan. An individual enrolled in an HDHP whose spouse is separately enrolled in a non-HDHP plan is ineligible for HSA contributions if the spouse's plan covers the HDHP-enrolled individual. If the spouse's plan covers only the spouse, the HDHP-enrolled individual retains eligibility.

Scenario 2 — Mid-year Medicare enrollment. An individual who turns 65 and enrolls in Medicare Part A on July 1 loses HSA eligibility as of that date. Contributions are permitted for January through June (6 eligible months). If the annual self-only contribution limit is $4,150 (the 2024 limit per IRS Rev. Proc. 2023-23), the prorated maximum contribution is $2,075.

Scenario 3 — Flexible Spending Account (FSA) conflict. Enrollment in a general-purpose Health FSA — including a spouse's FSA that covers the individual — disqualifies HSA contributions. A Limited-Purpose FSA restricted to dental and vision expenses does not trigger disqualification. The distinction between HSA and FSA accounts is detailed at HSA vs FSA key differences.

Scenario 4 — HDHP with employer HRA. If an employer pairs the HDHP with a general Health Reimbursement Arrangement (HRA) that reimburses expenses before the deductible is met, the individual loses HSA eligibility. A post-deductible HRA or a limited-purpose HRA preserves eligibility. See HSA vs HRA: when employers fund the account for the full comparison.

Decision boundaries

The table below distinguishes the primary coverage combinations that qualify or disqualify HSA contribution eligibility:

Veterans Affairs coverage presents a specific boundary: receiving VA benefits for a non-service-connected condition within the 3 months preceding an HSA contribution disqualifies that contribution. This restriction does not apply to veterans who received only service-connected care (IRS Publication 969).

Contribution limits — distinct from eligibility — are addressed at HSA contribution limits. Individuals who become eligible mid-year should also review how HSA contributions work to calculate prorated maximums accurately.

References

• IRS Publication 969: Health Savings Accounts and Other Tax-Favored Health Plans
• IRS Revenue Procedure 2023-23 (2024 HDHP and HSA thresholds)
• Internal Revenue Code Section 223 — Health Savings Accounts (Cornell LII)
• IRS Form 8889: Health Savings Accounts (HSAs)

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)