You cannot have both an HSA and a Flexible Spending Account (FSA) in the same year, with one narrow exception.

The IRS rule is straightforward: if you are covered by an HSA-may be able to access health plan, you cannot also contribute to a general-purpose FSA in that same calendar year. The two accounts are designed to serve the same purpose — setting aside pre-tax money for medical costs — and the IRS does not allow you to use both simultaneously.

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 covers only dental, vision, and hearing expenses, which means it does not overlap with what your HSA covers. A Dependent Care FSA, which covers childcare costs, also does not conflict with an HSA.

If you currently have a general-purpose FSA and want to switch to an HSA, you will need to stop contributing to the FSA first. The same applies in reverse: if you have an HSA and want to open a general-purpose FSA, you must stop HSA contributions.

Key Takeaways

  • You cannot contribute to both an HSA and a general-purpose FSA in the same calendar year under IRS rules.
  • A Limited-Purpose FSA that covers only dental, vision, and hearing expenses can be held alongside an HSA without violating IRS rules.
  • A Dependent Care FSA for childcare costs can also be held with an HSA at the same time.
  • If you switch from an FSA to an HSA or vice versa, the change typically takes effect on January 1 of the following year.
  • Money left in an FSA at year-end does not roll into an HSA; each account has its own separate rules for unused funds.

Why the IRS does not allow both accounts

Both an HSA and a general-purpose FSA let you set aside money before taxes are taken out, then use that money to pay for medical expenses. Because they serve the same function, the IRS treats them as duplicative. Allowing both would let a single person shelter too much income from taxes in a given year.

The intent of the rule is to prevent tax avoidance, not to limit your options. The IRS assumes you will choose whichever account makes more sense for your situation — an HSA if you want to build long-term savings, or an FSA if you have predictable medical costs you want to cover this year.

What happens if you have both accounts right now

If you are currently enrolled in both an HSA and a general-purpose FSA, you are out of compliance with IRS rules. This usually happens when someone changes jobs or health plans mid-year and does not realize the accounts conflict.

Contact your HSA provider or your employer's benefits administrator when ready. You will need to stop contributing to one of the accounts and may need to withdraw excess contributions from the account you are closing. The IRS allows a correction period, but the longer you wait, the more complicated the fix becomes. Your benefits administrator can walk you through the process and help you avoid penalties.

Limited-Purpose FSA: the exception that works with an HSA

A Limited-Purpose FSA is specifically designed to work alongside an HSA. It covers dental, vision, and hearing expenses only — the categories that an HSA also covers, but in a separate account.

This setup makes sense if you have predictable dental or vision costs. You can put a fixed amount into the Limited-Purpose FSA each year to cover those expenses, while your HSA grows as long-term savings for other medical costs or for future retirement healthcare needs. Some employers offer this combination as a standard option during open enrollment.

A Dependent Care FSA works the same way: because it covers childcare rather than medical expenses, it does not conflict with an HSA. You can have both accounts and contribute to both in the same year.

Moving from an FSA to an HSA

If you have a general-purpose FSA and want to switch to an HSA, you will need to stop FSA contributions first. This change usually happens on January 1, when most employer plans renew.

Before you switch, use up the money in your FSA. FSAs have a "use-it-or-lose-it" rule: money you do not spend by the end of the year (or by a grace period, if your plan offers one) goes back to your employer. An HSA, by contrast, rolls over year to year and grows like a savings account. If you have $500 left in your FSA on December 31 and you do not spend it, that money is gone. Plan your medical expenses accordingly before you make the switch.

Moving from an HSA to an FSA

If you have an HSA and want to switch to a general-purpose FSA, you must stop HSA contributions. Unlike an FSA, you do not have to spend down your HSA balance — the money stays in the account and continues to grow. You can keep the HSA open even after you stop contributing to it.

This switch might make sense if you lose HSA-may be able to access coverage (for example, if you move to a traditional health plan through a new job) or if you decide you prefer the simplicity of an FSA. Once you stop HSA contributions, you cannot restart them unless you regain HSA-may be able to access coverage.

How to choose between an HSA and an FSA

If your employer offers both options, the choice depends on your medical costs and how long you plan to stay with the plan. An HSA is better if you have low medical expenses now but want to save for future healthcare costs — the account grows like a retirement fund. An FSA is better if you have predictable medical costs this year and want to reduce your taxable income now.

An HSA also gives you more flexibility: you can withdraw money anytime for any reason (though non-medical withdrawals are taxed). An FSA is stricter — you can only withdraw money for may have access to medical expenses, and you must estimate your costs at the start of the year.

If you are unsure which account fits your situation, your employer's benefits administrator or a tax professional can help you model the numbers for your specific circumstances.

Frequently Asked Questions

What if I change jobs mid-year and end up with both an HSA and an FSA?

Contact your new employer's benefits administrator and your old employer's benefits administrator right away. One of you will need to close or stop contributions to one account. The IRS allows a correction window, but the sooner you fix it, the simpler the process. You may need to withdraw excess contributions, which your benefits team can help you calculate.

Can I use my FSA money to fund my HSA?

No. FSA and HSA are separate accounts with separate funding sources. Money in an FSA cannot be transferred to an HSA. If you are switching from an FSA to an HSA, you must spend down your FSA balance before the year ends or lose it.

If I have a Limited-Purpose FSA with my HSA, can I use both for the same dental visit?

Yes. You can use your Limited-Purpose FSA to pay for the dental visit and use your HSA for other medical expenses in the same year. Just keep track of which account you are drawing from so you do not accidentally pay the same expense twice.

What happens to my HSA if I switch to a regular FSA?

Your HSA stays open and the money remains in it. You can keep the account and let it grow, or you can withdraw the balance (though non-medical withdrawals are taxed). You straightforward cannot contribute new money to the HSA once you are no longer covered by an HSA-may be able to access plan.

Does my spouse's FSA affect whether I can have an HSA?

No. Your spouse's FSA does not prevent you from having an HSA. The IRS rule applies to each person individually. However, if you are both covered by the same family health plan, only one of you can have an HSA — the person who is the account holder on the plan.