HSA vs FSA: What's the Difference?

Both accounts let you set money aside for medical costs. They differ in who sets them up, who owns the money, and what happens to what you do not spend.

In short, an HSA is tied to a type of health plan and belongs to you. A health FSA is tied to your employer and its rules. The table below gives the side-by-side view, and the sections after it fill in the details.

To contribute to an HSA, the IRS says you must be covered by a high deductible health plan (HDHP) on the first day of the month, have no other disqualifying health coverage, and not be claimed as someone else's dependent. Having a high deductible is not enough on its own. The plan has to meet the IRS definition of an HDHP.

For 2027, the IRS defines an HDHP as a plan with an annual deductible of at least 1,750 dollars for self-only coverage or 3,500 dollars for family coverage. The plan's yearly out-of-pocket costs, not counting premiums, also cannot exceed 8,700 dollars for self-only coverage or 17,400 dollars for family coverage. Ask your insurer or your employer whether your plan is HSA-eligible before you open an account.

A 2025 federal law widened this. As of January 1, 2026, the IRS treats bronze and catastrophic plans as HSA-compatible even when they do not meet the usual high deductible definition, and they qualify whether or not they were bought through a government exchange (IRS Notice 2026-5). The same guidance lets people in certain direct primary care arrangements contribute. If you are not sure your plan qualifies, ask your plan or a tax professional.

A health FSA is different. You cannot open one on your own. Your employer has to offer it, and you usually fund it through salary reduction, which means the money comes out of your paycheck before taxes. Your employer can also contribute.

This is the biggest practical difference between the two.

Employers choose some FSA options, so your plan documents set the exact dates and rules that apply to you.

An HSA has three tax advantages. Your contributions are deductible even if you do not itemize, and employer contributions are excluded from your income. Earnings in the account grow tax free. Withdrawals for qualified medical expenses are tax free.

With a health FSA, you do not pay federal income tax or employment taxes on the salary you contribute, and reimbursements used for qualified medical expenses are not taxed.

Qualified medical expenses are medical care costs for you, your spouse, and your dependents that insurance or another source does not pay back. For both accounts, the IRS says over-the-counter medicine and menstrual care products can qualify. An HSA cannot pay for expenses you had before the account was opened. Generally, neither account can pay insurance premiums. The IRS lists a few narrow exceptions for HSAs, such as continuation coverage and health coverage while receiving unemployment benefits.

Limits change each year. For 2027, the IRS says the HSA limit is 4,500 dollars for self-only HDHP coverage and 9,000 dollars for family HDHP coverage (Revenue Procedure 2026-24). If you are still contributing for 2026, the 2026 limits are 4,400 dollars and 8,750 dollars. People age 55 or older can add 1,000 dollars. Employer contributions count toward your limit, so you cannot add yours on top of them.

For health FSAs, the most recent IRS figure we found is for plan years beginning in 2026. The limit on salary reduction is 3,400 dollars, and if the plan allows carryover, the maximum carryover is 680 dollars (Revenue Procedure 2025-32). We did not find a 2027 health FSA figure published by the IRS when we wrote this, so check IRS.gov or your benefits office for the number that applies to your plan year.

Sometimes, but not with a general-purpose health FSA. The IRS says you generally cannot contribute to an HSA while you are covered by a general-purpose health FSA that pays medical expenses before you meet your HDHP deductible.

You can still contribute to an HSA if the FSA is limited-purpose, which means it reimburses only certain costs such as dental and vision. A post-deductible FSA, which pays only after you meet the HDHP deductible, also works. If your employer offers more than one FSA option, ask which type each one is before you pick.

Start with the plan, not the account. Whether you can have an HSA depends on whether your health plan is an HSA-eligible HDHP. If it is not, an HSA is not an option, and an FSA may be the only one available if your employer offers it.

If you do have a choice, think about three things: how sure you are of your medical spending this year, whether you want money that stays with you year after year, and what your employer's FSA rules are on carryover and grace periods. The two accounts are built for different situations, not ranked against each other.

If you are choosing between plans at work or on your own and want to know whether a plan is HSA-eligible, a licensed advisor can explain how the plan's deductible and out-of-pocket limits work. Prime Health Consultants advisors are licensed and explain options in English and Spanish.

Advisors can help you understand plan documents. They are not tax advisors, so questions about how an account affects your taxes belong with a tax professional.