You cannot have a traditional FSA and an HSA in the same year, but you can have an HSA with a limited-purpose FSA or a dependent care FSA
The IRS rule is straightforward: if you contribute to a Health Savings Account (HSA), you cannot also contribute to a regular FSA in the same calendar year. The two accounts are designed to work differently, and the IRS treats them as competing ways to save for medical costs with tax advantages. However, this rule has exceptions. You can pair an HSA with a limited-purpose FSA (which covers only dental and vision expenses) or with a dependent care FSA (which covers childcare costs). The restriction applies only to general-purpose FSAs that cover a broad range of medical, dental, and vision expenses.
The reason for this rule comes down to how each account works. An HSA requires you to be enrolled in a high-deductible health plan (HDHP), and the account lets you save money tax-free for any may have access to medical expense now or in retirement. A regular FSA lets you set aside pre-tax dollars for medical expenses, but you must spend the money within the plan year or lose it (with a small carryover allowance in some plans). The IRS does not want you using both to shelter the same medical dollars from taxes.
Key Takeaways
- You cannot contribute to both an HSA and a regular FSA in the same year; the IRS treats them as mutually exclusive.
- You can have an HSA paired with a limited-purpose FSA that covers only dental and vision care, or with a dependent care FSA.
- If you have a regular FSA through your employer, you must stop contributing to it to open or contribute to an HSA.
- The restriction applies to the calendar year in which you make contributions, so timing matters if you are switching between accounts.
How the HSA and regular FSA conflict works
An HSA and a regular FSA both let you use pre-tax dollars for medical expenses, but they operate under different rules. The HSA is a savings account you own and control; money rolls over year to year, and you can invest it. The regular FSA is an employer-sponsored account where you forfeit unused money at the end of the plan year (though some plans allow a $640 carryover for 2024, varying by plan). Because both accounts reduce your taxable income and cover overlapping medical expenses, the IRS prohibits using them together.
The prohibition is strict. If you are covered by an HDHP and want to contribute to an HSA, you cannot be covered by any other health plan that is not an HDHP, and you cannot have a regular FSA. If your employer offers both, you must choose one. Some employers offer an HSA to employees who decline the regular FSA, while others offer only one or the other. Check your employer's benefits guide or ask your benefits administrator which accounts are available to you and whether they can coexist.
Limited-purpose FSAs: the exception that works with an HSA
A limited-purpose FSA covers only dental and vision expenses—things like dental cleanings, fillings, root canals, eyeglasses, contact lenses, and LASIK surgery. Because it does not cover general medical expenses, it does not conflict with an HSA. You can contribute to both in the same year. This combination is useful if your HDHP has a high deductible for medical care but you know you will have predictable dental or vision costs.
The contribution limits are separate. For 2024, the HSA limit is $4,150 for individual coverage and $8,300 for family coverage (these amounts change yearly). A limited-purpose FSA has its own limit, which varies by employer plan but is typically $3,200 to $3,300 for individual coverage. You set aside money in each account independently, and each has its own debit card or reimbursement process through your employer.
Not all employers offer limited-purpose FSAs. Many offer only a regular FSA or only an HSA. If your employer offers both an HSA and a limited-purpose FSA, the combination can be a strong strategy: you get the long-term savings and flexibility of the HSA for medical expenses, plus the when ready tax savings of the limited-purpose FSA for predictable dental and vision costs.
Dependent care FSAs work alongside HSAs with no restriction
A dependent care FSA is separate from the HSA-FSA conflict entirely. It covers childcare, adult day care, and summer camp expenses for dependents while you work. Because it does not cover medical expenses, there is no overlap with an HSA, and the IRS allows you to have both in the same year.
The dependent care FSA has its own contribution limit: $5,000 per year for a single filer or married couple filing jointly, or $2,500 if married filing separately. The money must be used for care that allows you to work, and it does not roll over—unused funds are forfeited at the end of the plan year (with no carryover option). You can use this account alongside an HSA without any restriction.
What happens if you switch from an FSA to an HSA mid-year
If you have a regular FSA and want to switch to an HSA, you must stop contributing to the FSA. The timing matters. If you contributed to a regular FSA earlier in the same calendar year, you cannot open an HSA until the next year. The IRS rule applies to the entire calendar year, not to the month you make the switch.
However, if you have already contributed to an FSA and then lose coverage under that FSA (for example, your employer drops the plan or you change jobs), you may be able to open an HSA in the same year, but only for the months after the FSA coverage ends. This is a narrow exception, and the rules are complex. If you are in this situation, contact your HSA provider or a tax professional to confirm whether you can open an account mid-year.
Money you already spent from your FSA does not affect your HSA may be able to access. The restriction is on contributions, not on reimbursements. If you spent $1,500 from your FSA in January and then switched to an HSA in July, the $1,500 you spent does not count against your HSA contribution limit.
Comparing the three accounts side by side
| Feature | HSA | Regular FSA | Limited-Purpose FSA | Dependent Care FSA |
|---|---|---|---|---|
| Can pair with HSA | — | No | Yes | Yes |
| Covers general medical | Yes | Yes | No | No |
| Covers dental and vision | Yes | Yes | Yes | No |
| Covers childcare | No | No | No | Yes |
| Money rolls over | Yes, indefinitely | No (small carryover in some plans) | No (small carryover in some plans) | No |
| You own the account | Yes | No, employer owns it | No, employer owns it | No, employer owns it |
| 2024 contribution limit (individual) | $4,150 | $3,300 | $3,300 | $5,000 |
How to know which account to choose
If your employer offers both an HSA and a regular FSA, choose based on your health care costs and how long you plan to stay with the employer. An HSA makes sense if you expect to have lower medical costs in the near term and want to save for future health expenses, including retirement. The money is yours to keep if you leave the job, and it grows tax-free. A regular FSA makes sense if you have predictable medical expenses this year and want to reduce your taxable income now, even though you will lose unused money at year-end.
If your employer offers an HSA and a limited-purpose FSA, the combination is often the best choice: you get the long-term savings of the HSA plus the when ready tax savings of the limited-purpose FSA for dental and vision. If your employer offers a dependent care FSA alongside an HSA, you can use both without conflict.
Your employer's benefits guide should list which accounts are available and whether they can be combined. If it is unclear, contact your benefits administrator or HR department. They can tell you exactly which combinations your plan allows.
Frequently Asked Questions
Can I have an HSA and a regular FSA if I switch jobs mid-year?
Only in narrow circumstances. If you leave a job with an FSA and start a new job with an HSA in the same calendar year, you generally cannot contribute to the HSA that year. The IRS rule applies to the full year. However, if your old FSA coverage ended before you opened the HSA, you may be able to contribute to the HSA for the months after the FSA ended. This requires careful timing and documentation. Consult a tax professional or your HSA provider to confirm.
What if I accidentally contributed to both an HSA and a regular FSA in the same year?
You must correct it by withdrawing the excess contribution from one account before your tax filing important date. The IRS imposes a 6% excise tax on excess HSA contributions each year they remain in the account. Contact your HSA provider or FSA administrator when ready to process the withdrawal and avoid penalties.
Does a limited-purpose FSA count as an FSA for the HSA rule?
No. A limited-purpose FSA covers only dental and vision, so it does not conflict with an HSA. You can contribute to both in the same year without restriction. Make sure your employer's plan is labeled as a limited-purpose FSA, not a regular FSA, to confirm they can coexist.
Can I use my HSA to pay for dependent care?
No. An HSA covers medical, dental, vision, and prescription expenses, but not childcare. If you need to save for both medical expenses and childcare, use an HSA for medical and a dependent care FSA for childcare. The two accounts do not conflict.
If I have an HSA, can I open a regular FSA later in the year?
No. Once you contribute to an HSA in a calendar year, you cannot contribute to a regular FSA in that same year. The restriction applies to the full year, not to individual months. You would need to wait until the next calendar year to switch.