How Flexible Spending Accounts Use Pre-Tax Dollars

Yes, money you put into a flexible spending account (FSA) comes out of your paycheck before federal income tax is calculated

When you contribute to an FSA, your employer deducts that money from your gross pay before calculating how much federal income tax, Social Security tax, and Medicare tax you owe. This means the dollars you set aside for medical or dependent care expenses are not subject to income tax. You pay taxes only on what remains after your FSA contribution is removed.

The pre-tax treatment is one of the main reasons FSAs exist — it reduces your taxable income for the year. If you contribute $3,000 to a health care FSA, your employer reports $3,000 less as your taxable wages to the IRS. The tax savings depend on your tax bracket, but most people save between 20 and 37 percent of what they contribute, depending on their federal tax rate.

Key Takeaways

FSA contributions are deducted from your paycheck before federal income tax is withheld, lowering your taxable income for the year.
You also avoid paying Social Security and Medicare tax on FSA contributions, which adds to your total savings.
The tax savings from an FSA depend on your tax bracket — someone in the 22 percent bracket saves roughly 22 cents per dollar contributed.
Money spent from your FSA on may be able to access expenses remains tax-free, so you get the benefit twice: once when you contribute and again when you spend it.

How the pre-tax deduction appears on your paycheck

Your employer withholds FSA contributions before calculating taxes. On your pay stub, you will see a line item for the FSA deduction, and your gross pay will be reduced by that amount before the tax withholding section. The amount shown as "taxable wages" or "federal taxable income" will already exclude your FSA contribution.

This happens automatically once you enroll in the FSA during your employer's open enrollment period. You choose how much to contribute for the year, and your employer divides that total by the number of pay periods, then deducts that amount from each paycheck. If you contribute $2,400 per year and are paid biweekly, your employer deducts $92.31 from every paycheck.

Tax savings from FSA contributions versus regular spending

The tax advantage of an FSA is that you pay no federal income tax, Social Security tax, or Medicare tax on the money you contribute. If you spent the same amount on medical or dependent care expenses using after-tax dollars, you would have to earn more money to cover both the expense and the taxes on that income.

For example, if you need $2,400 for dependent care and you are in the 22 percent federal tax bracket, contributing through an FSA saves you roughly $528 in federal taxes alone (22 percent of $2,400). You also avoid paying 7.65 percent in Social Security and Medicare taxes on that amount, which is another $183.60. The total tax savings would be around $711.60 — money you keep instead of sending to the government.

If you spent that same $2,400 using after-tax dollars, you would need to earn approximately $3,111 before taxes to have $2,400 left after paying all taxes and the expense. The FSA lets you accomplish the same goal with less gross income.

What happens when you use FSA money for may be able to access expenses

Once you have contributed pre-tax dollars to your FSA, you can spend that money on may be able to access medical or dependent care expenses without paying any tax on it. The IRS defines which expenses count — for a health care FSA, that includes copays, deductibles, prescription medications, and many other medical costs. For a dependent care FSA, may be able to access expenses include daycare, preschool, and summer camp for children under 13.

You submit receipts or invoices to your FSA plan administrator to prove the expense was may be able to access, and the plan reimburses you from your FSA balance. Because you already paid no tax on the contribution, the reimbursement is also tax-free. You do not report FSA reimbursements as income on your tax return.

The use-it-or-lose-it rule and pre-tax contributions

FSAs have a use-it-or-lose-it rule: money you do not spend by the end of the plan year is forfeited. This rule applies even though you contributed pre-tax dollars. If you contribute $2,500 to a health care FSA and spend only $1,800, you lose the remaining $700 — you cannot get that money back or roll it into the next year.

Some employers offer a grace period of up to 2.5 months into the next calendar year, during which you can still spend money from the previous year's FSA. A few employers also allow a carryover of up to $610 (the amount changes yearly) into the next plan year. Check your employer's FSA plan documents to see if either option is available to you.

Because of this rule, it is important to estimate carefully how much you will actually spend on may be able to access expenses during the year. Contributing too much and losing money defeats the tax advantage.

FSA contributions and your tax return

You do not claim FSA contributions as a deduction on your tax return because your employer has already removed them from your taxable income. The pre-tax treatment happens at the payroll level, not on Form 1040. Your W-2 form will show your FSA contributions already subtracted from your reported wages.

If you receive a reimbursement from your FSA for an may be able to access expense, you also do not report that on your tax return. The IRS considers FSA reimbursements a non-taxable benefit, not income. You cannot deduct the same expense twice — once through the FSA and again as a medical deduction on your tax return.

How FSA pre-tax treatment compares to other savings accounts

An FSA is different from a Health Savings Account (HSA) or a regular savings account in how the tax treatment works. An HSA also allows pre-tax contributions and tax-free withdrawals for may be able to access medical expenses, but HSA money rolls over year to year and never expires. An FSA money expires at the end of the plan year if you do not spend it.

A regular savings account offers no tax advantage on contributions — you contribute after-tax dollars and pay income tax on any interest earned. A 529 education savings plan works similarly to an FSA in that contributions may be pre-tax (depending on your state), but 529 money does not expire and can be used for education expenses across many years.

Frequently Asked Questions

Do I have to pay Social Security and Medicare tax on FSA contributions?

No. FSA contributions are exempt from federal income tax, Social Security tax (6.2 percent), and Medicare tax (1.45 percent). This is one reason the total tax savings from an FSA can be substantial — you avoid multiple types of tax on the same dollars.

Can I change my FSA contribution amount during the year?

You can change your contribution only during your employer's open enrollment period or if you have a may have access to life event, such as a birth, marriage, divorce, or significant change in dependent care costs. You cannot straightforward decide mid-year to contribute more or less. If your circumstances change, contact your benefits administrator to see if you can make a change.

What if I contribute to an FSA but do not use all the money?

Money you do not spend by the end of the plan year is forfeited — you lose it. Some employers offer a grace period of up to 2.5 months into the next year to spend remaining funds, or allow a carryover of up to $610 into the next plan year. Check your plan documents to see what your employer offers. This is why estimating your annual expenses carefully is important.

Is FSA money considered income on my tax return?

No. FSA contributions are deducted before your income is calculated, and reimbursements from your FSA are not reported as income. You will not see FSA activity on your Form 1040. Your W-2 already reflects the pre-tax deduction.

Can I use an FSA and an HSA at the same time?

You cannot contribute to both a health care FSA and an HSA in the same year — the IRS prohibits this. However, you can have a dependent care FSA and an HSA at the same time, since they cover different types of expenses. If you have a health care FSA through your employer, you are not able to open or contribute to an HSA that same year.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.