Limited Purpose FSA: For HSA-Eligible Employees

A Limited Purpose Flexible Spending Account (LP-FSA) allows employees enrolled in an HSA-eligible High-Deductible Health Plan to participate in a tax-advantaged spending account without disqualifying themselves from Health Savings Account contributions. This page covers how the LP-FSA is defined under IRS rules, how it operates alongside an HSA, which situations make it advantageous, and where the decision boundaries lie when choosing between account types. Understanding this structure matters because misclassifying an FSA type can immediately void HSA eligibility and trigger tax consequences for the entire year.

Definition and scope

A Limited Purpose FSA is a variant of the standard Health Care FSA, defined by the IRS under Internal Revenue Code Section 106 and Treasury Regulation §1.125-5 as one that restricts reimbursements to expenses that do not make an individual ineligible for HSA contributions. In practice, the IRS permits LP-FSA reimbursements for only two categories of expenses: vision care and dental care.

A standard Health Care FSA, by contrast, covers the full range of qualified medical expenses defined under IRC Section 213(d). Because a standard FSA constitutes "other health coverage" that is not permitted coverage under HSA rules, holding one while enrolled in an HDHP disqualifies the individual from making or receiving HSA contributions for that year. The LP-FSA resolves this conflict by limiting its scope to services that fall outside the HDHP's coverage structure entirely.

The IRS has also recognized a "post-deductible" FSA variant, which begins reimbursing general medical expenses only after the HDHP statutory minimum deductible has been met. For 2024, the IRS set the minimum HDHP deductible at $1,600 for self-only coverage and $3,200 for family coverage (IRS Revenue Procedure 2023-23). The post-deductible FSA is less common in employer plan design but is explicitly authorized under IRS Notice 2004-2 and Notice 2004-50.

For background on the broader regulatory framework governing these accounts, the regulatory context for health savings resource details the statutory and agency-level rules that govern account compatibility.

How it works

The LP-FSA operates mechanically in the same way as a standard Health Care FSA under the Section 125 cafeteria plan framework. Employees elect a contribution amount during open enrollment — or at initial hire as a qualifying life event — and those contributions are deducted from gross pay on a pre-tax basis before federal income, Social Security (FICA), and Medicare taxes are applied.

The contribution limit for LP-FSAs follows the same IRS cap that applies to standard Health Care FSAs. For 2024, that cap is $3,200 per employee (IRS Revenue Procedure 2023-23). If both spouses are enrolled in LP-FSAs through separate employers, each can contribute up to the individual limit.

Reimbursement is restricted to:

Dental expenses — exams, cleanings, fillings, crowns, orthodontia, and other dental procedures as defined under IRC Section 213(d)
Vision expenses — eye exams, prescription eyeglasses, contact lenses, contact lens solution, and corrective procedures such as LASIK
Post-deductible general medical expenses — only in post-deductible LP-FSA designs and only after the HDHP minimum deductible threshold has been satisfied for the plan year

Funds are available for withdrawal via an FSA debit card or manual claims submission. The standard "use-it-or-lose-it" rule applies: unused funds do not automatically roll over. Employers may offer a grace period of up to 2.5 months past the plan year end, or a carryover of up to $640 (2024 IRS limit), but not both (IRS Notice 2013-71).

During the LP-FSA plan year, the employee can simultaneously contribute to an HSA, because the LP-FSA does not constitute disqualifying coverage under IRC Section 223(c)(1)(B).

Common scenarios

Scenario 1: Employee with significant dental or orthodontic expenses
An employee enrolled in an HDHP-paired HSA plan anticipates $2,400 in orthodontic costs for a dependent child during the plan year. By electing $2,400 into an LP-FSA, the full amount is sheltered from federal income and FICA taxes while the HSA remains intact for general medical accumulation and investment. This preserves the HSA's long-term compounding potential.

Scenario 2: Near-retirement employee maximizing tax sheltering
An employee age 55 or older can contribute an additional $1,000 catch-up contribution to an HSA on top of the regular family limit of $8,300 (2024). Using an LP-FSA to cover dental and vision expenses separates those costs from HSA assets, allowing the HSA balance to grow for Medicare-related expenses after age 65. The health savings account overview at the site index provides orientation to how these accounts fit within a broader benefit structure.

Scenario 3: Dual-income household with one HDHP enrollee
One spouse is enrolled in an HDHP with an HSA; the other spouse holds a standard employer health plan. The HDHP-enrolled spouse can use an LP-FSA for dental and vision, while the other spouse may hold a standard FSA through their employer plan. IRS Notice 2004-50 addressed this household coordination structure, confirming that the HDHP spouse's HSA eligibility is not impaired by the non-HDHP spouse's standard FSA, provided the HDHP spouse is not covered under the non-HDHP plan.

Decision boundaries

Choosing between a standard Health Care FSA and an LP-FSA, or determining whether an LP-FSA adds value when an HSA is available, depends on four factors:

HDHP enrollment status — An employee not enrolled in an HSA-eligible HDHP has no reason to restrict FSA use. The standard Health Care FSA is appropriate and more flexible.
Anticipated dental and vision expenses — If projected out-of-pocket dental and vision costs exceed approximately $500 for the year, the tax savings from pre-tax LP-FSA contributions can outweigh the administrative constraint of a limited reimbursement scope. At a 22% federal income tax rate plus 7.65% FICA, the effective tax savings on $1,500 of LP-FSA contributions is approximately $447.
HSA contribution priority — Employees who intend to maximize HSA contributions and invest balances for long-term growth should treat the LP-FSA as a complementary account rather than a competing one. The LP-FSA handles current-year dental and vision costs; the HSA accumulates for general medical costs and retirement.
Plan year carryover and grace period design — Before electing an LP-FSA, employees must confirm the employer plan's carryover or grace period policy to minimize forfeiture risk. Over-electing into an LP-FSA when dental and vision expenses are low and no carryover exists exposes the employee to fund loss. FSA use-it-or-lose-it rules and the FSA grace period versus carryover comparison cover the mechanics that govern this risk.

The LP-FSA is not suitable as a substitute for HSA contributions and does not carry the HSA's triple tax advantage — contributions are pre-tax, growth is not applicable (no investment feature), and withdrawals for qualifying expenses are tax-free. Employees seeking to understand the full comparison between FSA and HSA structures should review the FSA and HSA compatibility analysis and IRS rules governing FSAs.

References

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