HSA vs. FSA in 2026: Contribution Limits and How the Two Accounts Differ

Both accounts let you pay medical costs with pre-tax money, and the 2026 limits sit close together, which makes them easy to confuse. They work differently, though, and the IRS rules decide which one you can use. This guide sets out the 2026 figures from the IRS and the main differences. It is general information, not tax advice.

The 2026 limits at a glance

| | HSA | Health FSA | |---|---|---| | 2026 contribution limit | $4,400 self-only; $8,750 family | $3,400 | | Extra for age 55+ | $1,000 | None | | Requires a high deductible health plan | Yes | No | | Carryover | Balance stays in the account | Up to $680, only if your plan allows it |

The HSA limits come from IRS Revenue Procedure 2025-19. The $3,400 health FSA limit and $680 carryover come from the IRS's tax-year 2026 inflation adjustments (IR-2025-103). The $1,000 catch-up for people 55 or older is stated in IRS Publication 969.

What makes a plan an HSA-eligible HDHP in 2026

You can only contribute to an HSA if you are covered by a high deductible health plan. For 2026, Rev. Proc. 2025-19 sets these thresholds:

• Minimum annual deductible: $1,700 self-only, $3,400 family.
• Maximum out-of-pocket expenses (deductibles, copays and other amounts, but not premiums): $8,500 self-only, $17,000 family.

A plan that does not meet both tests does not qualify, however it is marketed. Your plan documents or your insurer should state whether it is HSA-eligible.

Key differences

• Who owns it. An HSA is an individual account opened by the person covered. A health FSA is set up through an employer's plan, and the IRS says carryover is available only if the employer's plan permits it.
• What happens to the balance. HSA money you don't spend stays in the account. For an FSA, unspent money is generally limited to the carryover your plan allows, which the IRS caps at $680 for 2026.
• Eligibility. An HSA needs an HDHP. A health FSA does not.
• Combining them. Publication 969 says someone covered by an HDHP and a general-purpose health FSA generally can't contribute to an HSA. Limited-purpose and post-deductible FSAs are exceptions, so confirm which kind your employer offers before enrolling in both.

A worked example

A 57-year-old with family HDHP coverage in 2026 could contribute up to $8,750 plus the $1,000 catch-up, or $9,750 in total, to an HSA. Someone with non-HDHP coverage and a health FSA could set aside up to $3,400 through their employer. These are limits, not recommendations, and an employer's own plan may set lower caps. If you start the year with both account types available, the combination rule above applies first.

What to do with this

• Check your plan type first. Whether your coverage is an HDHP meeting the 2026 thresholds decides whether an HSA is available at all.
• Check your employer's FSA rules. Carryover is optional, so confirm what your plan allows before choosing a contribution amount.
• Stay under the limit. Contributions above the annual limit can have tax consequences, so track employer and personal contributions together.
• Put it in tax context. These accounts reduce taxable income, so the bracket you are in affects their value. See how the 2026 federal tax brackets and marginal rates work. If you are weighing where to hold savings instead, see I Bonds vs. Treasury bills vs. CDs.
• Get personal advice for edge cases. If your situation involves a spouse's coverage, mid-year changes or Medicare, a credentialed preparer can model it. See how to verify a tax preparer's PTIN or CPA license.

How we sourced this

The HSA contribution limits and HDHP thresholds are from IRS Rev. Proc. 2025-19, and the FSA limit and carryover are from the IRS's tax-year 2026 inflation adjustments, both retrieved October 13, 2026. The catch-up and combination rules are from IRS Publication 969, whose edition at retrieval was the 2025 one, so check the 2026 edition when it appears. We list sources so you can check each figure yourself, as set out in our editorial standards.

The takeaway

For 2026, an HSA allows $4,400 (self-only) or $8,750 (family) if you have a qualifying HDHP, and a health FSA allows $3,400 through an employer. The deciding question is your health plan, so confirm that first, then check your employer's FSA rules before choosing amounts.