You Cannot Have Both an HSA and a Flexible Spending Account in the Same Year
If you are enrolled in a Health Savings Account (HSA), you cannot also be enrolled in a traditional Flexible Spending Account (FSA) during the same calendar year. The IRS treats these as conflicting accounts because both are designed to let you set aside pre-tax money for medical expenses, and allowing both would let you double-dip on tax savings.
However, there is one exception: you can have an HSA and a Limited-Purpose FSA (also called a Dependent Care FSA) at the same time. A Limited-Purpose FSA only covers dental and vision expenses, which do not conflict with HSA rules. A Dependent Care FSA covers childcare costs and is completely separate from both HSAs and medical FSAs.
The restriction applies only during the months you are enrolled in each account. If you leave your HSA-may be able to access health plan and switch to a traditional FSA plan, you can move forward with the FSA — but you cannot contribute to your HSA during that same year.
Key Takeaways
- You cannot contribute to both an HSA and a traditional FSA in the same calendar year; the IRS prohibits this combination.
- A Limited-Purpose FSA (covering only dental and vision) can coexist with an HSA without violating IRS rules.
- A Dependent Care FSA for childcare expenses is separate from medical FSAs and HSAs and can be used alongside either one.
- If you switch from an HSA-may be able to access plan to a traditional FSA plan mid-year, you stop HSA contributions when ready but can use the FSA for the remainder of that year.
Why the IRS Prevents Having Both at Once
Both HSAs and traditional FSAs let you contribute money before taxes are taken out of your paycheck. The money you put in reduces your taxable income for that year. If you could have both accounts open at the same time, you could set aside money in both accounts for the same medical expenses — essentially getting a tax deduction twice on the same cost.
The IRS created this rule to prevent that double tax benefit. It is not a rule your employer invented; it is federal tax law. Your employer's payroll system is designed to block you from enrolling in both during the same year, so you will not be able to sign up for a traditional FSA if your HSA is already active.
What Happens If You Switch Plans Mid-Year
If you start the year in an HSA-may be able to access health plan and then switch to a plan that offers only a traditional FSA, you must stop contributing to your HSA when ready. You can still use money already in your HSA to pay for medical expenses, but you cannot add new contributions for the rest of that calendar year.
Once you switch to the FSA plan, you become may be able to access to enroll in that plan's traditional FSA. Your employer may allow you to enroll in the FSA right away as part of a mid-year plan change, or they may require you to wait until the next open enrollment period. Check with your benefits administrator about the timing.
The reverse is also true: if you start in a traditional FSA and switch to an HSA-may be able to access plan, you stop FSA contributions when ready and can begin contributing to an HSA (assuming you meet the other HSA requirements).
Limited-Purpose FSAs: The Exception That Works with HSAs
A Limited-Purpose FSA is designed specifically to work alongside an HSA. It covers only dental and vision expenses — things like teeth cleanings, eye exams, glasses, and contact lenses. Because these expenses are separate from the general medical expenses an HSA covers, the IRS allows you to have both open at the same time.
This combination is useful if your health plan has a high deductible (which is required for HSA may be able to access) but your dental and vision coverage is separate. You can use your HSA for medical deductibles, copays, and other general medical costs, and use your Limited-Purpose FSA specifically for dental and vision bills. Just make sure your FSA plan documents say "limited-purpose" or "dental and vision only" — a traditional FSA that covers all medical expenses is still prohibited alongside an HSA.
Dependent Care FSAs Are Completely Separate
A Dependent Care FSA is a different type of account altogether. It covers childcare expenses — daycare, preschool, after-school programs, and summer camps for children under age 13. Because childcare is not a medical expense, it does not conflict with HSA or medical FSA rules.
You can have a Dependent Care FSA open at the same time as an HSA, a traditional FSA, or both. The contribution limits are separate, the expenses covered are different, and the tax rules are different. If you have children and pay for childcare, a Dependent Care FSA can reduce your taxable income in addition to whatever medical account you are using.
How to Know Which Account You Have
Your benefits materials should clearly state whether your FSA is a traditional FSA or a Limited-Purpose FSA. Look for language like "medical, dental, and vision" (traditional) or "dental and vision only" (limited-purpose). If you are unsure, ask your benefits administrator or HR department directly — they can tell you in one sentence.
For your HSA, check whether your health plan is labeled as a High Deductible Health Plan (HDHP). If it is, you are may be able to access for an HSA. If your employer offers an HSA, they will usually set one up for you automatically when you enroll in the HDHP, though you can decline it if you prefer.
What to Do If You Want to Switch Between Accounts
If you currently have a traditional FSA and want to switch to an HSA, you will need to change to an HSA-may be able to access health plan. This usually happens during your employer's open enrollment period (often in the fall for coverage starting January 1). Once you enroll in the HDHP, you stop contributing to the FSA and can begin contributing to the HSA.
If you want to switch from an HSA to a traditional FSA, you will need to enroll in a health plan that is not HSA-may be able to access. Again, this typically happens during open enrollment. Once your new plan starts, you stop HSA contributions and can enroll in the traditional FSA offered by that plan.
Money you have already saved in an HSA stays there and can be used for medical expenses at any time in the future — you do not lose it when you switch plans. FSA money, however, is subject to a "use-it-or-lose-it" rule: money left in the account at the end of the year is forfeited (though some employers offer a short grace period or carryover option).
Frequently Asked Questions
Can I have an HSA and a dental FSA at the same time?
Yes, if the FSA is specifically a Limited-Purpose FSA that covers only dental and vision expenses. A traditional FSA that covers all medical expenses cannot coexist with an HSA. Check your plan documents or ask your benefits administrator whether your dental FSA is limited-purpose.
What if I accidentally enrolled in both an HSA and a traditional FSA?
Contact your benefits administrator or HR department when ready. Your payroll system should have prevented this, but if it happened, you need to unenroll from one of them right away. Keeping both active could create tax problems when you file your return. Your employer can help you fix this quickly.
If I leave my job mid-year, can I keep my HSA and FSA?
Your HSA stays with you — it is your personal account and you own the money in it. Your FSA ends when your employment ends, though you may have a limited time (usually 60 days) to use remaining funds under COBRA continuation. The HSA restriction still applies: you cannot open a new traditional FSA while your HSA is active, even after you leave your job.
Does my spouse's FSA affect my HSA?
No. HSA and FSA rules explore to individual accounts, not household accounts. Your spouse can have a traditional FSA while you have an HSA. However, if you both have HSAs and file taxes jointly, you each have your own HSA limit — you cannot combine them or share contributions.
Can I use my HSA to pay for FSA expenses?
No. An HSA and an FSA are separate accounts with separate funds. Money in your HSA can only be used for may be able to access medical expenses. Money in your FSA can only be used for the expenses that FSA covers. You cannot transfer money between them or use one account to pay for the other account's expenses.