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The Two Types of FSA: Healthcare FSA vs. Dependent Care FSA
A Flexible Spending Account (FSA) is a pre-tax benefit account offered through an employer's Section 125 cafeteria plan that lets you pay for eligible expenses with dollars that have never been taxed. There are two distinct types, and understanding the difference is essential before using an FSA calculator to plan your contribution.
A Healthcare FSA covers out-of-pocket medical, dental, and vision expenses for you, your spouse, and your dependents. Eligible expenses include deductibles, copayments, prescription drugs, glasses, contacts, orthodontia, and thousands of other IRS-approved items. Since the CARES Act of 2020, over-the-counter medications no longer require a prescription to qualify. A Dependent Care FSA covers qualifying childcare and dependent care costs for children under age 13 or for a qualifying dependent who is unable to care for themselves. Eligible expenses include licensed daycare, after-school programs, summer day camps (not overnight camps), and in-home care providers who are not your own dependents. The two accounts operate completely independently. You can contribute to both in the same year, and the FSA calculator above handles each type separately with its own 2024 IRS limits.
2024 FSA Contribution Limits and How They Affect Your Savings
The IRS adjusts FSA contribution limits periodically for inflation. For plan years beginning in 2024, the Healthcare FSA limit is $3,200 per employee. This is an individual limit, if both you and your spouse work for employers that offer Healthcare FSAs, each of you can contribute up to $3,200 to your own separate FSA, for a household total of $6,400. The Dependent Care FSA limit is $5,000 per household ($2,500 if you are married and file separately), and this household cap applies regardless of how many employers are involved.
Contributing the maximum amount only makes sense if you will actually spend it. If you contribute $3,200 to a Healthcare FSA but only spend $1,800, you risk forfeiting the remaining $1,400 at year-end. Which would eliminate your tax savings and cost you money. The FSA calculator above is designed to prevent exactly this scenario by recommending the lesser of your estimated expenses or the annual limit. A good rule of thumb: track your prior year's medical receipts before setting your contribution, and consider any known upcoming expenses like orthodontia, planned surgeries, or major dental work.
How FSA Tax Advantages Work: Federal, State, and FICA Savings
The tax advantage of an FSA operates differently from most deductions. Because FSA contributions flow through a Section 125 cafeteria plan payroll deduction, they reduce your W-2 Box 1 wages, your taxable compensation, rather than appearing as a deduction on your tax return. This means the tax savings happen automatically throughout the year via lower withholding, not as a lump-sum refund in April. More importantly, it means FSA contributions avoid three separate taxes, not just one.
First, you save your federal marginal income tax rate between 10% and 37% depending on your income and filing status. Second, most states treat FSA deductions the same way for state income tax purposes, adding another 0% to 9.9% in savings depending on your state. According to the IRS Publication 969, which governs health savings accounts and FSAs, FSA contributions through a Section 125 plan are excluded from both income and employment taxes. That third layer, FICA payroll taxes, is the one most people miss. FICA is 7.65% (6.2% Social Security up to the $168,600 wage base, plus 1.45% Medicare with no cap). Combined with federal and state income tax, a middle-income earner in California can save more than 35 cents on every FSA dollar contributed.
Use our tax bracket calculator to confirm your exact federal marginal rate before running the FSA calculator, and check our insurance calculators for related healthcare planning tools.
The FSA Use-It-or-Lose-It Rule: What You Need to Know
The most important risk to understand before contributing to an FSA is the use-it-or-lose-it rule established under IRS regulations. Any balance remaining in your FSA at the end of the plan year is forfeited. You cannot receive a refund, roll the funds into an IRA, or transfer them to a spouse. Employers keep the forfeited funds (though in practice many use them to offset FSA administration costs). There are two limited exceptions Congress and the IRS have created over the years:
The grace period option allows you to spend remaining FSA funds on eligible expenses up to 2.5 months after the plan year ends (typically March 15 for a January-December plan). The rollover option allows you to carry over up to $640 (2024 IRS limit, indexed annually) into the next plan year. Critically, your employer can offer one of these options but not both simultaneously, and there is no requirement for employers to offer either. Always confirm which option your plan provides before setting your contribution. The U.S. Department of Labor FSA FAQ provides authoritative guidance on plan rules and employee rights. The FSA calculator above displays a use-it-or-lose-it warning whenever your estimated expenses fall below the IRS limit, helping you set a safe contribution.
FSA vs. HSA: Which Account Is Right for You?
The FSA vs. HSA decision is one of the most impactful choices in your employee benefits package. Both accounts offer tax-free money for qualified medical expenses, but they differ in three fundamental ways: eligibility, rollover rules, and investment potential.
Eligibility: An HSA (Health Savings Account) is available only to individuals enrolled in a High-Deductible Health Plan (HDHP), defined by the IRS as a plan with a minimum deductible of $1,600 (self-only) or $3,200 (family) in 2024. An FSA can be paired with any employer health plan, including traditional low-deductible PPOs and HMOs. If you are on a non-HDHP plan, an FSA is your only option.
Rollover: HSA funds roll over in full every year, permanently. There is no use-it-or-lose-it deadline. You can accumulate an HSA balance for decades and spend it in retirement. FSA funds must be spent within the plan year with only limited exceptions.
Investment: HSA accounts at most major providers allow you to invest your balance in mutual funds, ETFs, and other securities once your balance exceeds a threshold. Combined with the triple-tax advantage; contributions are pre-tax, growth is tax-free, and withdrawals for qualified medical expenses are tax-free; the HSA is often described as the most powerful savings vehicle in the U.S. tax code. FSAs do not offer an investment feature. Per IRS Publication 969, HSA enrollment has grown substantially as high-deductible plans have become more common, but millions of workers still have access only to FSAs through their employer's plan design. Use the FSA calculator above to quantify exactly how much your available FSA can save you, then compare that figure to what an HSA would produce at the higher 2024 limits ($4,150 for self-only or $8,300 for family coverage) if you have access to an HDHP option.
Explore our full suite of insurance and healthcare financial tools to model Medicare costs, long-term care needs, and other benefits decisions alongside your FSA planning.