FSA Savings Calculator

How Flexible Spending Accounts Work

A Flexible Spending Account (FSA) allows you to set aside pre-tax dollars for qualified medical expenses. The 2025 contribution limit is $3,300 for a health care FSA. Because contributions are made with pre-tax dollars, you effectively save your marginal tax rate on every dollar contributed. For someone in the 24% tax bracket, contributing the maximum saves approximately $792 in federal income taxes.

Eligible Expenses

FSA funds can be used for copays, deductibles, prescription medications, dental care, vision care (including glasses and contacts), and many over-the-counter items. Some FSAs also cover dependent care expenses. IRS Publication 502 provides the complete list of qualified medical and dental expenses.

The Use-It-or-Lose-It Rule

Historically, FSA funds had to be used by the end of the plan year or they were forfeited. The IRS now allows employers to offer either a 2.5-month grace period or a $660 rollover (for 2025). Check with your employer to understand which option they provide. This makes it easier to avoid losing unused funds.

FSA vs HSA Comparison

FSAs are available with any employer health plan, while HSAs require a High Deductible Health Plan (HDHP). FSAs have lower contribution limits ($3,300 vs $4,300 individual) and funds may not roll over, whereas HSA funds roll over indefinitely and are portable. However, FSAs offer immediate tax savings with no investment decisions required.

Strategies to Optimize Your FSA

Estimate your predictable medical expenses for the year (regular prescriptions, planned procedures, annual dental work) and contribute that amount. Do not over-contribute beyond what you can realistically spend. Consider your employer rollover policy. Time elective procedures to maximize utilization. Keep all receipts and documentation for reimbursement claims.

What Is a Flexible Spending Account?

A Flexible Spending Account (FSA) is an employer-sponsored benefit that allows you to set aside pre-tax money from your paycheck to pay for eligible healthcare or dependent care expenses. By using pre-tax dollars, an FSA effectively reduces your taxable income, saving you 20-40% on qualified expenses depending on your tax bracket. For 2024, the IRS allows a maximum annual healthcare FSA contribution of $3,200 and a dependent care FSA contribution of $5,000 per household ($2,500 if married filing separately). FSAs are one of the most underutilized tax-advantaged benefits — many employees leave money on the table by not contributing enough or failing to spend their balance before the plan deadline.

Types of FSAs

There are three main types of FSAs. The Healthcare FSA (also called a Medical FSA) covers eligible medical, dental, and vision expenses including copays, deductibles, prescriptions, over-the-counter medications, medical equipment, and certain alternative treatments. The Dependent Care FSA pays for childcare expenses for children under 13, adult day care for disabled dependents, and before/after school programs, allowing working parents to pay for care with pre-tax dollars. The Limited Purpose FSA is available to people enrolled in Health Savings Accounts (HSAs) and covers only dental and vision expenses, preserving HSA eligibility while still providing tax savings on predictable dental and vision costs. Each FSA type has specific eligibility rules and contribution limits that determine how much you can save on taxes annually.

The Use-It-or-Lose-It Rule

The most important rule to understand about FSAs is the use-it-or-lose-it provision: any money remaining in your FSA at the end of the plan year is forfeited back to your employer. This rule creates a delicate balance between contributing enough to maximize tax savings and not contributing so much that you forfeit unused funds. However, the IRS offers two exceptions. First, employers may offer a grace period of up to 2.5 months after the plan year ends during which you can spend remaining funds. Second, employers may allow a carryover of up to $640 (for 2024) into the next plan year. Employers can offer either the grace period or the carryover, but not both. Before enrolling, check your plan's specific deadline and whether it offers a grace period or carryover to avoid losing money. Strategic spending near year-end on eligible expenses you were going to incur anyway — stocking up on prescriptions, scheduling dental work, buying new glasses — helps ensure you use your full balance.

Eligible FSA Expenses

FSA-eligible expenses span a wide range of healthcare costs. Medical expenses include doctor copays, hospital deductibles, prescription medications, insulin, and medical equipment like crutches or blood pressure monitors. Dental expenses cover cleanings, fillings, orthodontics, and dentures. Vision expenses include eye exams, prescription glasses, contact lenses, and LASIK surgery. Over-the-counter medications and health products are eligible without a prescription thanks to the CARES Act of 2020. Other eligible items include sunscreen (SPF 15+), first aid supplies, bandages, thermometers, fertility treatments, acupuncture, chiropractic care, physical therapy, and mental health counseling. Transportation costs for medical care and lodging near treatment facilities may also qualify. Ineligible expenses include cosmetic procedures, health club memberships, vitamins (for general health), and non-prescription items like toothpaste or shampoo. Many FSA administrators provide online stores and debit cards that automatically approve eligible purchases, simplifying the process of spending your funds on qualifying items.

How to Optimize Your FSA Contribution

Choosing the right FSA contribution amount requires estimating your predictable healthcare expenses for the coming year. Start by listing known expenses: regular prescriptions, planned medical procedures, annual dental cleanings, vision care needs, and expected copays for routine doctor visits. Add a small buffer for unexpected expenses like illness or minor injuries. If your employer offers the carryover option, you can be slightly more aggressive with your contribution since up to $640 can roll over. If your plan has only the grace period or no extension, be more conservative and plan to spend your full balance before the deadline. The tax savings are substantial — a $3,000 contribution saves approximately $720-1,200 in taxes depending on your bracket, effectively giving you a discount on healthcare expenses you were going to pay for anyway. FSA calculators help you determine the optimal contribution based on your expected expenses, tax bracket, and plan rules.

Example: FSA for a Family in the 24% Bracket

Carlos earns $95,000/year and is in the 24% federal tax bracket. He expects $2,800 in medical expenses this year (regular prescriptions, dental cleanings, and new glasses). He contributes $2,800 to his FSA. His tax savings: $2,800 x 24% = $672. His net cost is only $2,128 instead of $2,800 — an effective 24% discount on all medical expenses paid through the FSA.