Open enrollment periods often present a choice between two types of tax-advantaged healthcare accounts: Health Savings Accounts (HSAs) and Flexible Spending Accounts (FSAs). Both can reduce the tax impact of medical expenses, but they operate under different rules, have different contribution limits, and may suit different financial situations. Understanding how each account works can help frame more informed conversations with benefits administrators and financial professionals.
An HSA is a tax-advantaged account available to individuals enrolled in a high-deductible health plan (HDHP). The IRS defines an HDHP for 2026 as a plan with an annual deductible of at least $1,700 for self-only coverage or $3,400 for family coverage, according to Revenue Procedure 2025-19.
As IRS Publication 969 describes, HSA contributions may be tax-deductible for eligible individuals, balances can grow on a tax-deferred basis, and withdrawals used for qualified medical expenses are generally not subject to federal income tax. Publication 969 also outlines the eligibility requirements, contribution rules, and definitions of qualified expenses.
Revenue Procedure 2025-19 establishes the 2026 HSA contribution limits at $4,400 for self-only coverage and $8,750 for family coverage. Individuals aged 55 or older may contribute an additional $1,000 as a catch-up contribution.
HSAs are portable and not tied to a specific employer. After age 65, the IRS notes that account holders may withdraw funds for non-medical purposes, though such withdrawals would generally be subject to regular income tax. Account values invested in market-based options can fluctuate, and investment returns are not guaranteed.
A significant recent development: the One Big Beautiful Bill Act, signed into law in July 2025, expanded HSA eligibility effective January 1, 2026. IRS Notice 2026-05 confirms that bronze and catastrophic ACA marketplace plans now qualify as HDHPs for HSA purposes, that telehealth coverage before meeting the HDHP deductible is permanently allowed, and that certain direct primary care service arrangements are now compatible with HSA eligibility. These changes may broaden access for individuals who were previously ineligible.
The IRS describes an FSA as an employer-sponsored account funded through pre-tax payroll deductions. IRS Publication 969 outlines the general rules governing healthcare FSAs, including contribution limits, eligible expenses, and forfeiture provisions.
Revenue Procedure 2025-32 sets the 2026 healthcare FSA contribution limit at $3,400. One distinguishing feature is that FSAs typically provide access to the full annual election amount from the start of the plan year, even before the full amount has been contributed through payroll. This can be helpful for managing larger expenses early in the year.
However, FSAs generally operate on a "use-it-or-lose-it" basis. The IRS notes that employers may, but are not required to, offer either a grace period of up to 2.5 additional months or a carryover provision. For 2026, the maximum carryover amount is $680, per Revenue Procedure 2025-32. Unused funds beyond these provisions are typically forfeited. This structure may work well for individuals with predictable annual medical expenses who want to reduce taxable income through payroll deductions.
The accounts serve different financial planning needs, and the choice often depends on health plan structure, expected medical expenses, and individual preferences.
HSAs may offer potential for longer-term accumulation because funds roll over indefinitely and can be invested, though investment options introduce market risk. Some individuals use HSAs as a supplemental savings vehicle for future healthcare expenses.
FSAs may be more suited to individuals with predictable annual costs who benefit from early-year access to their full election amount, regardless of their underlying health plan type. The forfeiture provisions, however, require reasonably accurate estimation of annual expenses.
Neither account type guarantees specific outcomes. Both require careful record-keeping for tax compliance, and tax law changes, including the recent OBBBA provisions, can affect eligibility and features over time. IRS Topic 502 and the Form 8889 instructions provide additional detail on qualifying expenses and HSA reporting requirements.
Healthcare account selection involves multiple variables, and the considerations may differ based on individual circumstances. Reviewing IRS guidance, consulting with benefits administrators, and speaking with appropriately licensed professionals can help clarify which approach may align with your financial situation.