Can You Contribute to an HSA and FSA at the Same Time?

You can contribute to an HSA and FSA at the same time, but only if the FSA is a limited-purpose FSA, a post-deductible health FSA, or a dependent care FSA. A standard general-purpose health FSA disqualifies you from making HSA contributions for every month it’s active, even if you never file a single claim against it. Getting this pairing wrong turns your HSA deposits into excess contributions, which carry a 6% excise tax for each year they sit in the account.¹

Why a General-Purpose Health FSA Blocks HSA Contributions

HSA eligibility rules say you can’t be covered by any other health plan that reimburses medical expenses before your High Deductible Health Plan’s deductible is met.² A standard health FSA reimburses almost any qualified medical cost from day one: office visits, prescriptions, lab work, physical therapy. Because those dollars are available to pay expenses your HDHP deductible is supposed to cover first, the IRS treats a general-purpose FSA as disqualifying coverage.

The disqualification hinges on availability, not actual use. Even if the FSA balance sits untouched all year, its mere existence makes you ineligible for HSA contributions during every month it’s active.¹ This is the trap that catches people during open enrollment: they elect both, planning to use the FSA for small costs and the HSA for savings, and the entire year’s HSA contributions turn into excess contributions.

FSA Types That Work With an HSA

Three specialized FSAs fit inside the IRS exceptions and let you keep contributing to an HSA.

Limited-Purpose FSA

A Limited-Purpose FSA reimburses dental and vision expenses only. Cleanings, fillings, orthodontia, eye exams, prescription glasses, contact lenses, and laser eye surgery qualify. General medical costs like office visits or prescriptions do not.¹ Because it covers only “excepted benefits,” it isn’t disqualifying coverage. This is the most common HSA pairing, and the logic is simple: pay routine dental and vision costs from the FSA so the HSA balance can grow for larger needs or retirement.

Post-Deductible Health FSA

A post-deductible health FSA works like a standard FSA with one restriction: it won’t reimburse any medical expense until you’ve met the HDHP’s minimum annual deductible. The FSA deductible doesn’t have to match the HDHP deductible exactly, but no benefits can pay out before the minimum is reached.¹ Fewer employers offer these than Limited-Purpose FSAs, but coverage is broader once you clear the deductible.

Dependent Care FSA

A Dependent Care FSA sits under a different section of the tax code and has nothing to do with medical expenses. It covers child care for kids under 13 and care for qualifying adult dependents who can’t care for themselves.³ Because the money pays for caregiving, not health care, there is no conflict with HSA eligibility. The standard household limit is $5,000, or $2,500 if married filing separately. Enrolling in one alongside an HSA is always safe.

Your Spouse’s FSA Can Also Disqualify You

Coordination across two employers is where couples get burned. If your spouse enrolls in a general-purpose health FSA and that plan allows reimbursement for your medical expenses, which most do by default for spouses and dependents, the IRS treats you as covered by that FSA. Having your own separate HDHP doesn’t save you. Your spouse’s FSA dollars being available for your medical costs is disqualifying coverage, and your HSA contributions for those months become excess.¹

The fix takes both spouses coordinating at open enrollment. If one spouse wants to contribute to an HSA, the other needs to pick a Limited-Purpose FSA, a post-deductible FSA, or a Dependent Care FSA instead of a general-purpose health FSA. Different employers, different enrollment windows, and this often gets missed until tax filing season.

Year-End Traps When You Switch Plans

Moving from a general-purpose FSA to an HDHP with HSA at the start of a new plan year looks clean on paper. Leftover FSA funds tell a different story.

Grace Periods

Some employers allow a grace period of up to two and a half months after the plan year ends to spend down leftover FSA money. If your prior general-purpose FSA has a grace period and you carry any balance into it, you’re not HSA-eligible until the first day of the month after the grace period ends, even after you’ve switched to an HDHP.⁴ For a calendar-year plan, a March 15 grace period end means no HSA contributions until April 1. That’s three months of eligibility lost.

One escape: if the employer amends the plan so the general-purpose FSA converts to a limited-purpose or post-deductible FSA during the grace period, that coverage no longer disqualifies you.⁴ Not every employer does this, so ask benefits before assuming January 1 works.

Carryovers

Other plans allow a carryover of unused FSA money into the next year, up to $680 for 2026. A plan can offer a grace period or a carryover, but not both for the same FSA.¹ The carryover creates the same problem: general-purpose FSA dollars rolling into the new plan year remain available to pay medical expenses, so you have disqualifying coverage. To protect HSA eligibility, spend the FSA balance to zero before year-end or have the employer convert the carryover to a limited-purpose arrangement.

Medicare Creates the Same Excess-Contribution Problem

Once you enroll in Medicare Part A or Part B, you lose HSA eligibility for every month you’re entitled to Medicare. Being eligible at 65 doesn’t itself trigger disqualification; actual enrollment does. If you keep working past 65 on an employer HDHP without claiming Social Security, HSA contributions can continue.

The hidden problem is automatic Medicare enrollment through Social Security. Applying for Social Security retirement benefits at or after 65 auto-enrolls you in Medicare Part A, and Part A coverage applies retroactively for up to six months before your application date. Any HSA contributions during those retroactive months become excess. If you plan to claim Social Security after 65, stop HSA contributions at least six months before your application.

Fixing Excess Contributions

Contributions made during ineligible months, whether from an overlapping general-purpose FSA, a spouse’s FSA, or a Medicare lookback, are excess and carry a 6% excise tax for each year they remain in the account.¹

You can avoid the penalty by withdrawing the excess, plus any earnings on it, before the due date of your tax return (including extensions) for the year you made the contributions. Report the withdrawal on Form 8889 and include withdrawn earnings in gross income for that year. If you’re under 59½, the earnings portion also faces an additional early-distribution tax reported on Form 5329.⁵

Already filed without removing the excess? You still have room. You can pull the excess out up to six months after the original filing deadline (without extensions) by filing an amended return with “Filed pursuant to section 301.9100-2” written at the top.⁵ Miss that window and the 6% tax applies for the contribution year and each following year the excess stays put. Catching the mistake early is the difference between a paperwork fix and a compounding penalty.

1
Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans
2
Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
3
Office of the Law Revision Counsel. 26 USC 129 – Dependent Care Assistance Programs
4
Internal Revenue Service. Notice 2005-86 – Health Savings Account Eligibility During a Cafeteria Plan Grace Period
5
Internal Revenue Service. Instructions for Form 5329 – Additional Taxes on Qualified Plans and Other Tax-Favored Accounts