You can have an HSA and an FSA in the same year, but only if the FSA is a type that limits what it pays for. A standard general-purpose health FSA disqualifies you from contributing to a Health Savings Account because it reimburses medical costs before you meet your deductible. A limited-purpose FSA, a post-deductible FSA, or a dependent care FSA can sit alongside an HSA without a conflict. Getting the combination wrong triggers a 6% excise tax on every dollar of HSA contributions made while you were ineligible.1Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities
Why a General-Purpose FSA Blocks HSA Contributions
To contribute to an HSA, federal law requires that you carry no health coverage other than your HDHP that pays benefits before you satisfy the HDHP deductible.2Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts A standard health FSA reimburses a wide range of medical expenses starting from the first dollar you spend. The IRS treats that as disqualifying “other health coverage.”
The disqualification applies even if you never file a single claim against the FSA. Having access to the funds is enough. If your employer enrolls you in a general-purpose health FSA during open enrollment, you lose your ability to contribute to an HSA for every month that FSA coverage is in effect.
FSA Types That Work Alongside an HSA
Three FSA designs are structured so they never conflict with your HDHP’s deductible. Each limits what expenses the account can reimburse, or covers something other than medical care entirely.
Limited-Purpose FSA
A limited-purpose FSA only reimburses dental, vision, and preventive care expenses. Because it does not pay for general medical costs or hospitalizations, the IRS treats it as permitted coverage that does not disqualify you from HSA contributions.3Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans This is the most common pairing. For 2026 you can contribute up to the full $3,400 health FSA limit to a limited-purpose FSA while also maxing out your HSA.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Post-Deductible FSA
A post-deductible health FSA reimburses no medical expenses until you have satisfied the HDHP minimum annual deductible. After that threshold is met, it can reimburse general medical costs including coinsurance and copays. The IRS considers this HSA-compatible because no benefits are paid before the minimum deductible is reached.5Internal Revenue Service. Revenue Ruling 2004-45 – Health Savings Accounts Interaction With Other Health Arrangements These are less common, and not every employer offers them.
Dependent Care FSA
A dependent care FSA covers childcare, eldercare, and similar costs that let you work. It has nothing to do with health coverage and is governed by a different section of the tax code. Contributing to one has no effect on your HSA eligibility. The 2026 maximum dependent care FSA contribution is $7,500 per household.
When a Spouse’s FSA Affects Your Eligibility
If your spouse enrolls in a general-purpose health FSA through their employer, your HSA eligibility may be at risk. Most health FSAs allow reimbursement of medical expenses for the employee’s spouse and dependents, not just the employee. If your spouse’s FSA can pay for your medical bills, you are technically covered by that plan and no longer an eligible individual for HSA purposes.2Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
The disqualification hinges on whether the FSA is designed to cover your expenses, not whether your spouse actually submits a claim for you. If the plan documents allow it, that is enough. The simplest fix is for your spouse to elect a limited-purpose FSA instead, or to skip FSA coverage entirely. If your spouse is merely eligible for a general-purpose FSA but does not enroll, your HSA eligibility is unaffected.
During open enrollment, review your spouse’s benefit elections alongside your own. Even if you use different employers and different carriers, the combination of your accounts must still satisfy federal eligibility rules.
Grace Periods and Carryovers When Switching from FSA to HSA
Leftover money from a prior year’s general-purpose FSA can disqualify you from HSA contributions even after you stop contributing to the FSA. Employers typically handle unused balances one of two ways, and both create risks.
Grace Period Risk
A grace period gives you up to two and a half months after the plan year ends to spend down remaining FSA funds on prior-year expenses. During that stretch, you are still covered by the general-purpose FSA and remain ineligible for HSA contributions. This is true even if your FSA balance is zero.6Internal Revenue Service. Health Savings Account Eligibility During a Cafeteria Plan Grace Period
For example, if your FSA plan year ends December 31 and the grace period runs through March 15, you are not HSA-eligible until April 1. You lose three months of HSA contribution capacity and can contribute only 9/12ths of the annual limit for that year. One workaround: some employers amend their cafeteria plan to automatically convert the general-purpose FSA into a limited-purpose FSA during the grace period, which preserves your HSA eligibility.6Internal Revenue Service. Health Savings Account Eligibility During a Cafeteria Plan Grace Period
Carryover Risk
If your employer allows unused FSA money to carry over (up to $680 in 2026), that carried-over balance functions as general-purpose health coverage in the new plan year.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Even a small carried-over balance can block HSA eligibility for the whole year unless your employer converts it to a limited-purpose carryover. A plan cannot offer both a grace period and a carryover for the same health FSA.3Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans
If you plan to move from a general-purpose FSA to an HSA next year, spend the FSA down to zero before the plan year ends and confirm with your employer that no carryover or grace period will apply.
If You Already Contributed to an HSA While Ineligible
Contributions made during any month you were not an eligible individual are classified as excess contributions. The IRS applies a 6% excise tax on excess contributions for each year they remain in the account.1Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities The contributions also lose their tax-deductible status and must be included in your gross income for that year. You report the excess and calculate the penalty on IRS Form 5329.7Internal Revenue Service. Instructions for Form 5329
The 6% tax repeats every year until you correct the problem. You have two ways to stop it:
- Withdraw the excess before your filing deadline. If you remove the excess and any earnings on it before the due date of your tax return (including extensions), the IRS treats the contributions as if never made. The withdrawn earnings go into your gross income for the year of withdrawal.8Internal Revenue Service. Instructions for Form 8889
- Use the six-month extended deadline. If you already filed on time without withdrawing the excess, you can still fix it up to six months after your original filing deadline (not counting extensions), then file an amended return with “Filed pursuant to section 301.9100-2” written at the top.8Internal Revenue Service. Instructions for Form 8889
If you do neither, the excess stays in the account and can be applied toward a future year’s contribution limit once you regain eligibility. You will owe the 6% excise tax for every year the excess sits there uncorrected.