FSA vs. HSA: what's the difference?

If you're evaluating health benefits for your employees, you may also be considering offering a healthcare flexible spending account (FSA) or a health savings account (HSA). Both accounts help employees pay for eligible healthcare expenses and can provide tax advantages for employees and employers. The right option depends on the health plan you offer, your payroll setup, and your benefits goals.

This guide explains the differences between healthcare FSAs and HSAs, how each account works, and the factors to consider before deciding whether to offer one as part of your benefits package.

What is an FSA (flexible spending account)?

A healthcare flexible spending account (FSA) is a pretax account employees can use to pay for qualified medical expenses. Employers establish healthcare FSAs through a Section 125 cafeteria plan. Section 125 plans must also pass annual nondiscrimination testing to confirm they don’t favor highly compensated or key employees.

Employees typically choose how much to contribute during open enrollment, although IRS rules allow certain midyear changes after qualifying life events. Examples of qualifying life events may include marriage, divorce, the birth or adoption of a child, or losing other healthcare coverage.

The elected contribution is deducted from each paycheck in equal installments throughout the plan year. The employee's full annual election is generally available at the beginning of the plan year, even though payroll deductions continue throughout the year.

Employers are responsible for deducting employee contributions through payroll and ensuring the FSA complies with IRS requirements, either by administering the plan internally or working with a third-party administrator.

Employees can use FSA funds for a wide range of qualified healthcare expenses, including:

• Copays, deductibles, and coinsurance
• Prescription medications
• Dental and vision care
• Eligible over-the-counter medicines and healthcare products, according to IRS rules

For 2026, employees can contribute up to $3,400 to a healthcare FSA, per IRS rules.

Most healthcare FSAs follow a use-it-or-lose-it rule, meaning unused funds are forfeited at the end of the plan year. Employers may choose to offer one of two exceptions:

• A carryover of up to $680 into the next plan year, or
• A grace period of up to 2½ months after the plan year ends to use remaining funds.

What is an HSA (health savings account)?

A health savings account (HSA) is a personal, tax-advantaged account that employees can use to pay for qualified medical expenses. Unlike a healthcare FSA, the account belongs to the employee, so the money stays with them even if they change jobs or retire. They can opt to keep the HSA with their current provider or transfer it to a new one.

To open and contribute to an HSA, an employee must be enrolled in an HSA-qualified high-deductible health plan (HDHP). Employees enrolled in Medicare, including those 65 and older who are still working, can’t contribute to an HSA.

Employers can offer an HSA-qualified HDHP, facilitate payroll deductions, and choose whether to contribute to employees' HSAs.

For 2026, the plan must meet IRS requirements, including:

• A minimum annual deductible of $1,700 for self-only coverage or $3,400 for family coverage
• Maximum annual out-of-pocket costs of $8,500 for self-only coverage or $17,000 for family coverage

Employees, employers, or both can contribute to an HSA, often through payroll deductions. Note that if employers contribute outside of a Section 125 plan, the IRS generally requires those contributions to be comparable for all eligible employees in the same coverage tier, such as self-only or family.

For 2026, the annual HSA contribution limits are:

• $4,400 for self-only coverage
• $8,750 for family coverage
• An additional $1,000 catch-up contribution for individuals age 55 or older

HSA funds can be used for many of the same qualified medical expenses covered by a healthcare FSA, including:

• Copays, deductibles, and coinsurance
• Prescription medications
• Dental and vision care
• Eligible over-the-counter medicines and healthcare products under IRS rules

FSA vs. HSA: key differences

The primary differences between an FSA and an HSA involve ownership, eligibility, contributions, portability, and investment options.

Similarities between FSAs and HSAs

Despite their different rules for eligibility, ownership, and contributions, healthcare FSAs and HSAs share several core features:

• Tax advantages. Both let participants use tax‑advantaged dollars for qualified medical expenses, and contributions made through payroll can reduce taxable income.
• Qualified medical expenses. Both are intended for IRS‑qualified healthcare costs. Tax benefits apply only when funds are used for eligible expenses.
• No double-dipping. Employees can’t use FSA or HSA funds to reimburse medical expenses that are already covered by insurance or another health plan.
• Annual IRS limits. Both have annual contribution limits set by the IRS, and employees typically select a contribution amount for the year, subject to those limits.

Can you have both an FSA and an HSA?

Generally, no. Pairing a standard healthcare FSA with an HSA disqualifies HSA eligibility. Both accounts let employees use pretax dollars for the same medical expenses, and IRS rules don't allow that overlap.

Two FSA types are the exception:

• Limited-purpose FSA. Covers dental and vision expenses only, so it doesn't overlap with what an HSA is meant to cover.
• Dependent care FSA. Covers child or elder care costs, which have nothing to do with medical eligibility, so it can be offered alongside an HSA.

Offering either of these alongside an HSA lets employees get more pretax coverage without losing HSA eligibility.

If an employee already has an HSA from a previous employer, they keep the account and any money in it. Enrolling in a standard healthcare FSA doesn't affect the existing balance, but it does make the employee ineligible to make new HSA contributions for as long as they're covered by the FSA.

Which is right for you and your employees?

The right choice depends on the health plan you offer and how your employees are likely to use their benefits.

Consider a healthcare FSA if:

• Your health plan isn't an HSA-qualified high-deductible health plan (HDHP), so employees aren't eligible for an HSA
• Employees expect regular healthcare expenses and want to pay for them with pretax dollars
• Your team is comfortable making an annual contribution election and using the funds within the plan year

Consider an HSA if:

• You offer, or plan to offer, an HSA-qualified HDHP
• Employees want a portable account they can keep if they change jobs or retire
• You want to pair an HSA-qualified HDHP with a tax-advantaged savings account that employees can use for current or future healthcare expenses

Some businesses pair an HSA-qualified HDHP with an HSA and offer a limited-purpose FSA for dental and vision expenses. That approach gives employees additional pretax benefits without affecting their HSA eligibility.

How to offer FSAs and HSAs to your employees

Offering an FSA or HSA requires coordination between your health plan, payroll system, and benefits administration. These steps can help you set up the account correctly and keep it running smoothly for your employees.

1. Confirm your medical plan type. An HSA only works if the plan qualifies as an HDHP under current IRS thresholds. Keep in mind that other health coverage, such as Medicare or a non-HDHP plan for the employee or their spouse, can affect HSA eligibility.
2. Set up a Section 125 cafeteria plan document. A healthcare FSA requires a Section 125 cafeteria plan, and employee HSA contributions made through payroll generally do as well.
3. Decide on a carryover or grace period. If you’re offering a healthcare FSA, decide whether to allow a limited carryover of unused funds or a grace period. The IRS caps how much can roll over and how long employees have to spend what’s left.
4. Choose an administrator. Work with a broker, a benefits administrator, or your HSA/FSA provider directly to handle plan setup and compliance.
5. Apply pretax payroll deductions. Employee benefit elections should be reflected accurately in pretax payroll deductions based on the employee's eligibility and enrollment.
6. Communicate the details. Employees need to understand contribution limits, what's eligible, and what happens to unused funds if they choose an FSA.
7. Review IRS limits each year. Update your plan materials and payroll system to reflect the latest IRS contribution limits before open enrollment.

Find and manage employee health benefits with QuickBooks Workforce

Whether you're offering health benefits for the first time or updating an existing program, QuickBooks Workforce helps keep employee benefits and payroll connected.

It integrates HR and payroll so pretax deductions for healthcare FSAs, HSAs, retirement plans, and other benefits can be managed on a single platform. Employee information stays aligned as employees enroll, make changes, or join your team.

If you're still evaluating health coverage, QuickBooks Workforce also gives you access to group health insurance options through Allstate Health Solutions. Compare healthcare packages and find coverage that fits your business. QuickBooks Workforce will even handle your payroll deductions.*

***Health benefits:** Health insurance info is provided by Intuit Insurance Services Inc., a licensed insurance broker, through a partnership with Allstate Health Solutions. Intuit Insurance Services Inc. is owned and operated by Intuit Inc. and is paid a fee by Allstate Health Solutions in connection with referred clients. Intuit is not an insurance carrier. Plans are sold separately and require acceptance of Allstate's Terms of Use and Privacy Policy.