FSA contributions reduce your taxable income, which is why they save you money

When you contribute to a Flexible Spending Account through your employer, that money comes out of your paycheck before federal income tax is calculated. This means the amount you put in lowers the total income the IRS taxes you on. If you contribute $3,000 to an FSA in a year, you pay federal income tax on $3,000 less of your salary.

The same applies to Social Security and Medicare taxes (called FICA taxes). Your FSA contributions reduce those as well. This is different from contributing to a regular savings account or a Roth IRA, where the money comes from after-tax dollars and does not lower your taxable income.

The tax savings depend on your tax bracket. Someone in the 22% federal tax bracket who contributes $2,500 to an FSA saves roughly $550 in federal taxes alone, plus additional savings on FICA taxes. Someone in a lower bracket saves less per dollar contributed.

Key Takeaways

  • FSA contributions are deducted from your paycheck before taxes are withheld, reducing the income amount the IRS taxes you on.
  • You save on federal income tax, Social Security tax, and Medicare tax through FSA contributions.
  • The actual dollar amount you save depends on your tax bracket and FICA tax rate.
  • You cannot deduct FSA contributions again on your tax return — the tax benefit happens at the payroll level, not when you file.
  • Money you withdraw from an FSA to pay for covered medical expenses is not taxed, which is the second layer of tax savings.

Why FSA contributions are called "pre-tax"

The term "pre-tax" means the money leaves your paycheck before your employer calculates how much federal income tax to withhold. Your employer sends that FSA contribution directly to the FSA account holder (usually a third-party administrator), not to the IRS.

When you file your tax return at the end of the year, you do not report FSA contributions as income and you do not deduct them. The tax reduction already happened through payroll withholding. Your W-2 form from your employer will show a lower gross income figure because FSA contributions were removed before that number was calculated.

The difference between FSA tax savings and medical expense deductions

FSA contributions give you a tax break at the payroll level. A separate tax rule — the medical expense deduction on Schedule A — lets you deduct certain medical costs on your tax return, but only if those costs exceed 7.5% of your adjusted gross income. Almost nobody qualifies for this deduction because the threshold is so high.

An FSA is better than trying to claim medical expenses on your tax return because you get the tax savings automatically, regardless of how much you earn or what your other medical costs are. You do not have to reach a threshold. The downside is that you can only contribute up to a set limit each year (currently $3,300 for 2024, though this amount can change), and you must spend the money on covered medical expenses or lose it.

What happens when you use FSA money to pay for medical expenses

When you withdraw money from your FSA to pay for a covered expense — such as a copay, prescription, dental work, or glasses — that money is not taxed. You already got the tax break when the contribution was deducted from your paycheck. The withdrawal itself is tax-free.

This is the second layer of tax savings. You contributed pre-tax dollars, and you spend them on medical costs without paying tax on the withdrawal. If you had put that same money in a regular savings account, you would have paid tax on it when you earned it, and you would not get any special tax treatment when you spent it on medical care.

State and local taxes on FSA contributions

FSA contributions reduce your federal taxable income in all states. Most states follow federal tax rules and also exclude FSA contributions from state income tax. However, a small number of states — including New Jersey, Pennsylvania, and Illinois — tax FSA contributions at the state level even though they are excluded from federal tax.

If you live in one of these states, you will still save on federal taxes through your FSA, but you will not get a state tax break. Check with your state's tax authority or your employer's benefits office if you are unsure whether your state taxes FSA contributions.

FSA contribution limits and tax planning

For 2024, the maximum FSA contribution is $3,300 per year. This limit is set by the IRS and can change annually. Your employer may set a lower limit, so check your plan documents to see what your specific workplace allows.

The contribution limit matters for tax planning because it caps how much pre-tax medical spending you can shelter from taxes each year. If you have significant medical expenses, you might contribute the maximum. If you have few medical expenses, contributing less reduces the risk of losing money at the end of the year under the use-it-or-lose-it rule.

Frequently Asked Questions

Do I report FSA contributions on my tax return?

No. FSA contributions are deducted at the payroll level, so they do not appear on your tax return. Your W-2 already reflects the reduction in taxable income. You cannot deduct them again on Schedule A or any other form.

Can I claim FSA withdrawals as a medical expense deduction?

No. Once you use FSA money to pay for a medical expense, you cannot deduct that same expense on your tax return. The tax benefit already happened when you contributed the money pre-tax. Claiming it twice would be double-dipping.

What if I do not spend all my FSA money by the end of the year?

Money left in your FSA at the end of the plan year is forfeited under the use-it-or-lose-it rule. You do not get a tax refund, and you cannot roll the money into next year. Some plans offer a grace period of up to 2.5 months into the next year, or a carryover of up to $640, but this varies by employer.

Does my employer get a tax break from my FSA contribution?

Yes. When you contribute to an FSA, your employer also avoids paying payroll taxes (Social Security and Medicare taxes) on that amount. This is a tax benefit for the employer, which is one reason employers offer FSAs — they reduce the employer's tax burden as well as the employee's.

Are FSA contributions different from HSA contributions for tax purposes?

Both are pre-tax, but HSAs (Health Savings Accounts) offer an additional benefit: unused money rolls over year to year and grows tax-free. FSAs have a use-it-or-lose-it rule. HSAs also let you deduct contributions on your tax return if you are self-employed, whereas FSAs do not.