Can You Have an HSA and FSA in the Same Year?

Yes, you can have an HSA and an FSA in the same year, but only if the FSA is one the IRS treats as compatible with a High Deductible Health Plan. A standard general-purpose health care FSA will disqualify you from contributing to an HSA because it can reimburse medical expenses before you meet your HDHP deductible. Pair your HSA with a limited-purpose FSA, a post-deductible FSA, or a dependent care FSA instead, and both accounts keep their tax advantages.

Why a General-Purpose FSA Blocks HSA Contributions

To contribute to an HSA, you have to be an “eligible individual” under federal tax law: covered by an HDHP and not covered by any other health plan that pays for medical expenses before your deductible is met.¹ A general-purpose health FSA reimburses qualifying medical expenses from the first dollar, with no deductible to satisfy. The IRS treats that first-dollar reimbursement as “other health coverage” that conflicts with HDHP status.²

Contribute anyway and the IRS calls the money “excess.” Excess contributions carry a 6% excise tax for every year they sit in the account.³ A $2,000 excess left in place for three years generates $360 in excise tax on top of any income tax owed.

FSA Types That Work Alongside an HSA

The IRS carved out three FSA variants that don’t reimburse the same medical expenses your HDHP covers before the deductible, so they preserve your HSA eligibility.

Limited-Purpose FSA

A limited-purpose FSA (sometimes labeled LEX HCFSA) reimburses only dental and vision expenses: orthodontia, prescription eyeglasses, contact lenses, routine cleanings.⁴ Dental and vision care are explicitly excluded from the tax code’s disqualifying-coverage definition, so this FSA doesn’t threaten HSA eligibility.¹ Use it for predictable dental and vision costs and let your HSA balance grow for larger or long-term expenses.

Post-Deductible FSA

A post-deductible FSA only pays out after you’ve satisfied your HDHP’s minimum annual deductible. It won’t reimburse any medical expenses incurred before that point.² Once you hit the deductible, it can cover copays, coinsurance, and other qualifying costs. These are less common than limited-purpose FSAs, so check your plan documents at open enrollment.

Dependent Care FSA

A dependent care FSA reimburses work-related childcare and adult daycare for qualifying dependents, not medical expenses. Because it has no connection to health coverage, it creates no conflict with HSA eligibility. Confirm with your employer that the account is coded as dependent care rather than general-purpose health care. The names look similar on benefits portals, and picking the wrong box could cost you HSA eligibility for the year.

Your Spouse’s FSA Can Disqualify You

This is where careful planners get caught. If your spouse enrolls in a general-purpose health FSA through their employer, and that FSA is allowed to reimburse your medical expenses, the IRS treats you as having disqualifying coverage. You don’t have to submit a single claim. The mere availability of the reimbursement is enough to end your HSA eligibility.²

Most employer-sponsored FSAs cover the employee, spouse, and dependents by default. Unless your spouse’s employer offers a limited-purpose or post-deductible version and your spouse elects it, that general-purpose FSA will knock you out. Filing taxes separately doesn’t help. Keeping separate health insurance policies doesn’t help either. The workable fixes are for your spouse to decline the general-purpose FSA, switch to a limited-purpose one, or run the balance to zero before the year you plan to contribute to your HSA.

Timing Traps When Switching From an FSA to an HSA

Leaving a general-purpose FSA for an HDHP with an HSA isn’t as clean as flipping the calendar. Two leftover features of the old FSA commonly push back the date you can start contributing.

Grace Period

Some FSAs include a grace period of up to two and a half months after the plan year ends, during which you can still submit claims against the prior year’s balance. The IRS treats this as continuing disqualifying coverage. You can’t contribute to an HSA until the first day of the month after the grace period ends, even if your HDHP is already in force.⁵ An FSA year ending December 31 with a grace period running through March 15 pushes HSA eligibility to April 1, capping your contribution at 9/12ths of the annual limit.

Carryover

If your FSA allows a carryover instead of a grace period, unused funds roll into the next plan year. A general-purpose carryover disqualifies you from HSA contributions for the entire following year, because those dollars can still reimburse pre-deductible medical expenses.² The cleanest move is to spend the FSA down to zero before the plan year ends. Some employers also allow converting a general-purpose carryover into a limited-purpose balance, which keeps HSA eligibility intact because the remaining funds can only pay for dental and vision.

The Last-Month Rule

If you become HSA-eligible partway through the year, the last-month rule lets you contribute the full annual amount as long as you’re eligible on December 1.² The catch is a testing period: you must remain HSA-eligible through December 31 of the following year. Drop your HDHP or pick up disqualifying coverage during that 13-month window and the extra contributions are added back to your taxable income and hit with a 10% additional tax. Only lean on this rule if you’re confident your coverage will hold.

Fixing an Excess HSA Contribution

If you already contributed to an HSA while enrolled in a disqualifying FSA, the fix is to withdraw the excess plus any earnings it generated before your tax filing deadline. You can’t deduct the withdrawn amount, and the earnings are reported as income in the year of withdrawal.⁶

Already filed without correcting it? You still have a window: withdraw the contributions within six months of the original filing deadline and file an amended return with “Filed pursuant to section 301.9100-2” written at the top. Miss both deadlines and the 6% excise tax applies every year the money stays in the account.³ Call your HSA custodian to start the withdrawal. Most have a dedicated form for excess contribution removals and will calculate the allocable earnings for you.

1
Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
2
Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans
3
Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities
4
FSAFEDS. Eligible Limited Expense Health Care FSA (LEX HCFSA) Expenses
5
Internal Revenue Service. Health Savings Account Eligibility During a Cafeteria Plan Grace Period
6
Internal Revenue Service. Instructions for Form 8889