How to Use an FSA

To use an FSA, elect a realistic contribution through your employer, spend the funds on expenses your plan considers eligible, and follow the plan’s payment, documentation, and deadline rules. Contributions to a health care FSA are generally deducted from pay before taxes, which can reduce the after-tax cost of eligible care. Your election is usually taken from your pay over the plan year, but unused funds may be forfeited unless your employer’s plan allows a limited rollover or grace period. The rules depend on the type of FSA you have, so confirm whether your account is for health care or dependent care before enrolling or spending. Check your balance and save receipts throughout the year to help use the benefit without losing funds to ineligible expenses or missed deadlines.

What Can an FSA Pay For?

A health care FSA can generally pay eligible out-of-pocket medical expenses. The U.S. Department of Health and Human Services’ HealthCare.gov resource explains that FSAs cover eligible health care expenses. Examples may include copays, deductibles, prescription medicines, dental treatment, vision care, and certain medical supplies or services. Eligibility depends on the expense and the plan, so check your administrator’s eligible-expense information before paying.

An FSA is not the same as a personal savings account. Its funds are subject to plan rules and may not remain available indefinitely. Employers may offer a grace period after the plan year, allow a limited amount of unused funds to roll over, or offer neither option. Your plan documents explain whether any unused money can carry forward and what limits apply. Amounts beyond what the plan permits may be forfeited.

Health care and dependent care FSAs cover different expenses and have separate rules. A dependent care FSA is intended for qualifying care expenses, rather than medical expenses. Learn more about dependent care FSAs, eligible child care expenses, and the 2026 dependent care FSA limit.

What Plan Rules Should You Check?

Your employer’s plan documents determine how to enroll, pay, and submit claims. Two employees with health care FSAs may have different payment methods, documentation requirements, or deadlines. Before using the account, check:

• Which type of FSA you have. Health care and dependent care accounts cover different expenses. Do not assume that funds from one account can pay expenses assigned to the other.
• How to pay. Your plan may provide a benefits card, require you to pay first and submit a reimbursement claim, or allow both methods.
• Whose expenses may qualify. Check the plan’s rules for expenses incurred by you or eligible family members.
• What records are required. You may need an itemized receipt, invoice, explanation of benefits, or other documentation. Follow the administrator’s instructions for each claim.
• When expenses and claims are due. The date an expense must be incurred may differ from the deadline for submitting a claim.
• Whether unused money can carry forward. Confirm whether your plan offers a grace period or rollover and what limits apply.

Add important plan dates to your calendar when you enroll. A reminder before the end of the plan year gives you time to check your balance and submit claims without relying on a last-minute rush.

How Much Should You Contribute?

Base your election on expenses you can reasonably expect to incur during the plan year. Review what you spent previously and identify predictable costs such as regular prescriptions, therapy or specialist appointments, dental care, contact lenses, replacement glasses, medical supplies, and routine copays.

Then account for likely changes. An upcoming procedure or a known need for new prescription eyewear may affect your estimate. Choose an amount you are confident you can use for eligible expenses while allowing for uncertainty and considering your plan’s forfeiture rules. A tax advantage is not a reason to contribute more than your expected costs justify. For more on the tax treatment, read whether an FSA is pre-tax.

How Do You Pay for an Eligible Expense?

Once you have an eligible expense, your plan’s payment method determines what to do next. Follow the administrator’s instructions even if the purchase seems straightforward.

Pay with an FSA Card

If your plan provides a payment card, use it with a provider or merchant that accepts it. Keep the receipt even when the transaction is approved. The administrator may later ask you to confirm what you purchased and why it qualifies. Card approval does not guarantee that an expense is eligible. If a charge is found to be ineligible, you may have to repay the account.

Pay First and Request Reimbursement

You can pay with your own card or cash and submit a claim to the FSA administrator. A claim may require the date of service, provider or merchant name, description of the expense, amount paid, and proof of payment. An explanation of benefits may help support a medical claim. A credit card statement by itself often does not identify the service or item, so provide the documentation your administrator requests.

How Should You Track Claims and Deadlines?

Save receipts, claim confirmations, and benefit notices in one place as you receive them. Keep records until each claim is accepted and any documentation requests are resolved. Organized records make it easier to submit claims on time, respond to questions, avoid duplicate submissions, and check what remains in the account.

Check your balance several times during the year. If funds remain as the plan year approaches its end, consider eligible care you already expect to need, such as an eye exam, prescription refill, or planned dental work. Confirm that an expense qualifies before paying for it. Do not buy something solely to spend down the account.

Pay attention to both the date an expense is incurred and the deadline to submit its claim. Those dates can differ, so use your plan documents rather than assuming that a general deadline applies. If you are comparing an FSA with an HSA, remember that their eligibility and account rules differ.

Common FSA Mistakes to Avoid

• Assuming every health-related purchase qualifies. Check the eligible-expense rules before buying.
• Discarding receipts too soon. Keep proof until the claim is complete and accepted.
• Missing administrator messages. Check email and account notices for requests or deadlines.
• Waiting until year-end to check the balance. Review it during the plan year so you have time to plan.
• Confusing an FSA with another account. Funding, eligibility, and rollover rules differ between account types.
• Electing more than you expect to use. Estimate likely eligible expenses and consider the risk of forfeiture.

Make FSA Checks Part of Your Routine

Check your account when you schedule care, refill a prescription, order glasses, or pay a medical bill. Employers can help employees use benefits by explaining enrollment choices and sending timely reminders about plan deadlines. For employees managing U.S.-based benefits as part of a global workforce, clear information about the employer’s specific plan is especially useful.

Before enrolling, confirm the account type and rules. After enrolling, track spending, save records, and check deadlines throughout the year. These steps can help you use the tax benefit for eligible care while reducing the chance of losing funds to a missed claim or unused balance.

*This article is for general informational purposes only and is not legal advice.