HSA Eligibility Requirements

Health Savings Account (HSA) eligibility is governed by a specific set of federal rules codified in 26 U.S.C. § 223, administered by the Internal Revenue Service. Meeting each requirement is not optional — failure to qualify in any given month means contributions made in that month are treated as excess contributions and subject to tax and penalty. This page covers the definition of eligibility, how the qualification mechanism operates month by month, common scenarios that create eligibility complications, and the boundaries that determine covered versus disqualified status.

Definition and Scope

HSA eligibility, as defined under IRS Publication 969, requires that an individual simultaneously satisfy four conditions:

1. Enrollment in a High-Deductible Health Plan (HDHP) — The individual must be covered under an HDHP that meets IRS minimum deductible and maximum out-of-pocket thresholds. For 2024, the IRS set the minimum annual deductible at $1,600 for self-only coverage and $3,200 for family coverage (IRS Rev. Proc. 2023-23).
2. No disqualifying other coverage — The individual cannot be covered by any non-HDHP health plan, including a general-purpose Flexible Spending Account (FSA) or Health Reimbursement Arrangement (HRA) that covers expenses before the HDHP deductible is met.
3. Not enrolled in Medicare — Enrollment in Medicare Part A or Part B terminates HSA contribution eligibility as of the month Medicare coverage begins.
4. Not claimed as a dependent — The individual cannot be claimed as a tax dependent on another person's return for the relevant tax year.

These conditions apply on a month-by-month basis. An individual who qualifies for 9 months of a calendar year may only contribute a prorated amount unless the last-month rule applies (discussed below).

The regulatory context for health savings that governs HSAs traces primarily to the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, which established § 223 of the Internal Revenue Code and gave the IRS authority to publish annual inflation-adjusted thresholds.

How It Works

Eligibility determination follows a month-by-month test. On the first day of each month, an individual is either eligible or not. If eligible for the full 12 months, the full annual contribution limit applies. If eligible for only part of the year, the contribution limit is prorated by the number of eligible months, divided by 12.

The Last-Month Rule provides an exception: an individual who is HSA-eligible on December 1 may contribute the full annual limit for that year, regardless of how many months they were eligible. However, this rule activates a testing period — the individual must remain HSA-eligible through December 31 of the following year. Failure to do so results in the excess contribution amount becoming taxable income plus a 10% penalty, per IRS Publication 969.

HDHP coverage verification is the most common eligibility trigger. The HDHP must be the individual's primary coverage. A secondary plan — whether a spouse's employer plan, TRICARE, or a general-purpose FSA — can disqualify the individual even if the HDHP is in place. A Limited-Purpose FSA, which restricts reimbursements to dental and vision only, does not disqualify HSA eligibility because it does not cover general medical expenses before the deductible.

The IRS applies these rules to the account holder, not dependents. A child covered under the parent's HDHP does not independently qualify to open or fund an HSA unless they meet all four eligibility conditions in their own right.

Common Scenarios

Scenario 1 — Mid-year employer plan change
An employee switches from a general-purpose PPO to an HDHP on July 1. Eligibility begins July 1. The individual may contribute 6/12 of the annual limit (approximately $2,150 for self-only in 2024) unless electing the last-month rule.

Scenario 2 — Spouse's FSA enrollment
An individual enrolled in an HDHP discovers that their spouse's employer enrolled the spouse in a general-purpose FSA. Under IRS rules, if the FSA covers the HDHP enrollee's expenses — which is common unless the FSA is explicitly restricted — the HDHP enrollee loses HSA eligibility for the months the FSA is active. Coordinating coverage to use a Limited-Purpose FSA or ensuring the FSA does not cover the HSA account holder resolves the conflict.

Scenario 3 — Medicare enrollment at age 65
An individual turning 65 enrolls in Medicare Part A. HSA contributions must stop as of the first day of the month Medicare begins. Medicare Part A enrollment is sometimes retroactive by up to 6 months for individuals who delay enrollment past 65. Retroactive Medicare coverage can create retroactive HSA ineligibility, generating excess contributions for those months. The HSA and Medicare rules address this retroactivity risk in detail.

Scenario 4 — Self-employed individuals
A self-employed individual who purchases an HDHP on the individual market qualifies for HSA eligibility under the same four-condition test. There is no employer-sponsored plan requirement. The National Health Savings Authority home page provides orientation to the full range of account types available to individuals outside employer-sponsored arrangements.

Decision Boundaries

Veterans Administration (VA) benefit coverage creates a specific boundary: per IRS Notice 2004-2, receiving VA medical benefits for a non-service-connected disability disqualifies HSA eligibility for the 3 months following that use. Service-connected disability treatment through the VA does not trigger disqualification.

HDHP vs. non-HDHP comparison is the most operationally significant boundary. A plan that has a $0 deductible for primary care visits — even if it carries a high deductible for hospital care — may fail the HDHP definition because the IRS requires that the plan not provide benefits below the minimum deductible threshold for services other than preventive care. Preventive care, as defined by IRS Notice 2004-23 and expanded by IRS Notice 2019-45 for certain chronic illness treatments, is exempt from the deductible requirement and does not disqualify HDHP status.

Correcting excess contributions — contributions made during ineligible months — requires withdrawing the excess plus earnings before the tax filing deadline (including extensions) to avoid the 6% excise tax imposed under 26 U.S.C. § 4973. The excess contribution correction procedures page details the mechanics of this process.

References

• IRS Publication 969 — Health Savings Accounts and Other Tax-Favored Health Plans
• 26 U.S.C. § 223 — Health Savings Accounts (GovInfo)
• IRS Revenue Procedure 2023-23 — 2024 HSA Inflation Adjustments
• IRS Notice 2004-2 — HSA Guidance Q&A
• IRS Notice 2019-45 — Preventive Care for Chronic Conditions
• Internal Revenue Service — Health Savings Accounts (HSAs)

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