A flexible spending account (FSA) lets you set aside part of your paycheck before taxes to pay for medical expenses or dependent care, effectively giving yourself a discount on costs you’d pay anyway. The tax savings alone can put hundreds or even thousands of dollars back in your pocket each year, and the money is available to cover everything from doctor visits and prescriptions to daycare and preschool.
How the Tax Savings Work
The biggest benefit of an FSA is that your contributions come out of your paycheck before federal income tax, state income tax, Social Security tax, and Medicare tax are calculated. That means every dollar you put into an FSA avoids all of those taxes at once.
To see why that matters, consider a quick example. If you’re in the 22% federal tax bracket, pay 5% in state income tax, and owe the standard 7.65% for Social Security and Medicare, your combined tax rate on each additional dollar of income is roughly 34.65%. Contribute $2,000 to a health care FSA and you save about $693 in taxes that year. Contribute the full $3,400 allowed for 2026 and the savings climb to nearly $1,178. You’re spending money on the same medical bills you’d pay regardless, but you’re paying with pre-tax dollars instead of after-tax dollars.
Your actual savings depend on your tax bracket and state tax rate, but for most working adults, an FSA reduces the real cost of eligible expenses by roughly 25% to 40%.
What You Can Spend It On
A health care FSA covers a wide range of medical, dental, and vision expenses for you, your spouse, and your dependents. The IRS sets the rules for what qualifies, and the list is more generous than many people realize. Common eligible expenses include:
- Doctor and specialist copays, including urgent care and telehealth visits
- Prescription medications and insulin
- Over-the-counter products like pain relievers, allergy medicine, first aid supplies, sunscreen, and menstrual products
- Dental work such as fillings, crowns, orthodontics, and cleanings
- Vision expenses including eyeglasses, contact lenses, and laser eye surgery
- Mental health services and therapy sessions
- Medical equipment like crutches, blood pressure monitors, and hearing aids
Some items may require a letter of medical necessity from your doctor before they qualify, so check your plan’s eligible expense list if you’re unsure about a specific purchase.
Dependent Care FSA Benefits
A separate type of FSA, the dependent care FSA (sometimes called a DCFSA), helps you pay for childcare or elder care with pre-tax money. For 2026, you can contribute up to $7,500 per household if you’re married filing jointly, or $3,750 if married filing separately. Qualifying expenses include daycare, preschool, before- and after-school programs, summer day camp, and care for a dependent adult who lives with you.
The IRS also offers a dependent care tax credit, which applies a percentage (20% to 35%, based on your income) to up to $3,000 in expenses for one child or $6,000 for two or more. For most households earning above $43,000, that credit is capped at 20%, meaning the maximum credit is $1,200 for two or more children. A dependent care FSA, by contrast, shelters up to $7,500 from all payroll and income taxes. For families in moderate to higher tax brackets, the FSA typically delivers larger savings than the credit. You can’t double-dip on the same expenses, though, so it’s worth running the numbers for your specific income and childcare costs.
Both spouses must have earned income to use a dependent care FSA, unless one is a full-time student.
Your Full Balance Is Available Day One
With a health care FSA, your entire annual election is available on the first day of your plan year, even though you fund it gradually through payroll deductions over 12 months. If you elect $3,400 for the year and need a $2,500 dental procedure in January, you can use your FSA to cover it immediately, even though you’ve only contributed a fraction of that amount so far. This is a meaningful advantage over a health savings account (HSA), where you can only spend what you’ve actually deposited.
Dependent care FSAs work differently. You can only reimburse expenses up to the amount you’ve contributed so far, so the funds build up over the course of the year.
The Use-It-or-Lose-It Rule
The main drawback of an FSA is that unspent money doesn’t roll over indefinitely. If you don’t use your balance by the end of the plan year, you risk forfeiting it. However, most employers offer one of two cushions. A grace period gives you an extra two and a half months after the plan year ends to spend remaining funds. Alternatively, some plans allow a carryover of a limited amount into the next year. These options are set by your employer, not by you, and a plan can offer one or the other but not both.
The best way to avoid losing money is to estimate your expenses carefully before you enroll. Add up your typical annual spending on copays, prescriptions, dental work, glasses, and over-the-counter products. If you’re unsure, start with a conservative amount. You can always adjust your election during the next open enrollment period.
How an FSA Compares to an HSA
If your employer offers a high-deductible health plan, you may have access to a health savings account instead of (or sometimes alongside) an FSA. Both use pre-tax dollars, but HSAs let unused funds roll over year after year and even grow through investments. The tradeoff is that HSAs require enrollment in a high-deductible plan, while FSAs work with any employer-sponsored health plan. FSAs also give you the full balance upfront, which can be a real advantage if you have a large expense early in the year.
Some employers offer a limited-purpose FSA that covers only dental and vision expenses, which you can use alongside an HSA. This lets you get the pre-tax benefit on those costs while keeping your HSA funds invested for the long term.
Who Benefits Most From an FSA
An FSA delivers the most value if you have predictable medical or dependent care expenses each year. Families with young children in daycare, people who wear glasses or contacts, anyone with ongoing prescriptions, and those planning elective dental or vision procedures can all see significant savings. Even if your expenses are modest, setting aside a few hundred dollars pre-tax for routine costs like copays and over-the-counter medicine is essentially free money you’d otherwise hand to the IRS.
You enroll during your employer’s open enrollment period, typically in the fall for the following year. Choose your annual contribution amount based on a realistic estimate of your spending, and your employer will divide it into equal payroll deductions. From there, you pay for eligible expenses with your FSA debit card or submit receipts for reimbursement.