A flex account holds pre-tax money you set aside for medical or dependent care costs

A flex account (also called a flexible spending account or FSA) is a workplace benefit that lets you put money into a special account before taxes are taken out of your paycheck. You then use that money to pay for may be able to access medical expenses or dependent care costs. The money comes out of your gross income, which lowers your taxable income for the year.

Your employer sets up the account through a plan administrator — a third-party company that handles the money and processes your claims. You decide how much to contribute each year during your employer's open enrollment period, usually in the fall. That amount is divided across your paychecks for the coming year.

The main trade-off: money you don't spend by the end of the plan year is forfeited. You cannot roll it over to the next year or take it out as a refund. This is called the "use-it-or-lose-it" rule, and it is the single most important thing to understand about flex accounts.

Key Takeaways

  • Flex accounts hold pre-tax money for medical or dependent care, which reduces the income taxes you owe that year.
  • You choose how much to contribute during open enrollment, and that amount is locked in for the entire plan year.
  • Any money you do not spend by the end of the plan year is forfeited — you cannot carry it over or withdraw it.
  • You submit receipts or claim forms to the plan administrator to get reimbursed from your flex account balance.
  • Flex accounts are separate from health insurance; you can have both at the same time.

How money flows in and out of a flex account

When you enroll in a flex account, you tell your employer how much to contribute for the year — for example, $2,500. Your employer then deducts that amount from your paychecks before calculating taxes. If you are paid biweekly, roughly $96 comes out of each check and goes into your flex account instead of your take-home pay.

Throughout the year, when you have an may be able to access expense, you pay for it out of pocket and then submit a claim to the plan administrator. You will need a receipt or invoice showing the date, amount, and what the expense was for. The administrator reviews the claim and, if it is may be able to access, reimburses you from your flex account balance. Some employers offer a debit card linked to the flex account, which lets you pay directly without submitting a claim afterward.

The reimbursement is not taxed — that is the whole point. You saved money by not paying income tax, Social Security tax, and Medicare tax on that amount. If you contribute $2,500 to a medical flex account and your combined tax rate is 25 percent, you save roughly $625 in taxes.

Medical flex accounts versus dependent care flex accounts

There are two types of flex accounts, and they cover different expenses. A medical flex account (sometimes called a healthcare FSA) covers out-of-pocket medical, dental, and vision costs. may be able to access expenses include copays, deductibles, prescription medications, glasses, hearing aids, and certain medical equipment. Preventive care that your insurance covers at no cost does not count.

A dependent care flex account covers the cost of childcare or adult dependent care while you work. This includes daycare centers, in-home nannies, after-school programs, and adult day care for aging parents. It does not cover education (like preschool tuition) or overnight care.

You can enroll in both types at the same time if your employer offers both. The contribution limits are separate. For 2024, the medical flex account limit is $3,300 per person, and the dependent care limit is $5,000 per household (or $2,500 if you are married and file taxes separately).

The use-it-or-lose-it rule and how to avoid losing money

Money left in your flex account at the end of the plan year does not roll over. If you contribute $2,500 and spend only $1,800, the remaining $700 is gone. This rule exists because of federal tax law — if you could carry money over indefinitely, the tax advantage would be too large.

Most employers offer a grace period of up to 2.5 months after the plan year ends. During this time, you can submit claims for expenses you incurred during the plan year. Check your plan documents to see if your employer allows this. A few employers also offer a carryover option that lets you roll up to $610 (in 2024) into the next year, but this is less common.

To avoid forfeiting money, estimate conservatively. Look at your actual medical or childcare spending from the past year and contribute a similar amount. If you are unsure, start low — you can usually increase your contribution next year during open enrollment. Do not contribute money you are unlikely to spend just because the tax savings seem attractive.

How to submit a claim and get reimbursed

The process for claiming reimbursement depends on your plan administrator and whether you have a debit card. If you have a debit card, you can swipe it at the pharmacy or doctor's office, and the charge comes directly from your flex account. Some cards require you to submit a receipt afterward to verify the expense was may be able to access.

If you do not have a debit card, or if the provider does not accept it, you pay out of pocket and then submit a claim. Log into your plan administrator's website or app, fill out a claim form, and upload a receipt or invoice. The receipt must show the date, the amount, the provider's name, and what the expense was for. Most administrators process claims within one to two weeks.

Keep all receipts and documentation for at least three years. The IRS can audit flex account claims, and you need to prove that the expense was may be able to access and that you paid for it.

Flex accounts are not the same as health savings accounts

Flex accounts and health savings accounts (HSAs) are often confused because both hold pre-tax money for medical expenses. The key difference is that flex account money is forfeited if you do not spend it, while HSA money rolls over indefinitely and can be invested like a retirement account.

You can only open an HSA if you are enrolled in a high-deductible health plan. Flex accounts have no insurance requirement — you can have a flex account with any health plan, or even with no health insurance at all. Some employers offer both, and you can enroll in both at the same time, though there are limits on how much you can contribute to each.

If your employer offers an HSA and you are may be able to access, compare the two before deciding. An HSA is usually better if you expect to have low medical expenses, because the money does not disappear. A flex account is better if you have predictable annual expenses and want to maximize your tax savings right now.

What happens to your flex account if you leave your job

When you leave your employer, your flex account ends. Any money remaining in the account is forfeited — your employer does not return it to you, even if you contributed it. This is true whether you quit, are laid off, or are fired.

You have the right to continue coverage under COBRA (Consolidated Omnibus Budget Reconciliation Act) for up to 18 months after you leave, but this applies to health insurance, not flex accounts. Flex accounts cannot be continued under COBRA.

If you are leaving a job and have money left in your flex account, try to spend it before your last day. Submit any outstanding claims immediately. If you have a dependent care flex account and are leaving before the end of the year, calculate how much childcare you will need before your new job starts and try to use that amount from your account.

Frequently Asked Questions

Can I change my flex account contribution during the year?

No, not normally. Your contribution is locked in for the entire plan year. You can only change it during open enrollment or if you have a may have access to life event — marriage, divorce, birth of a child, loss of other coverage, or a significant change in childcare costs. Your employer decides which events may have access to.

What if I submit a claim and the administrator says it is not may be able to access?

Ask the administrator to explain which part of the expense was ineligible. Some expenses are borderline — for example, certain over-the-counter medications are may be able to access only if you have a prescription. If you disagree with the decision, ask if you can appeal or provide additional documentation. Keep records of the denial in case you need to dispute it later.

Do I pay taxes on the reimbursement I get from my flex account?

No. The reimbursement itself is not taxed. You already saved taxes when the money went into the account. The reimbursement is simply your own money being returned to you for an may be able to access expense.

Can I use my flex account to pay for my spouse's medical expenses?

Yes, if your spouse is a dependent on your tax return. You can also use it for your children and any other dependents you claim. The expense must still be may be able to access — the dependent's relationship to you does not change what counts.

What if I have a flex account and then lose my job mid-year?

Your flex account ends on your last day of employment. Any remaining balance is forfeited. You cannot take it with you or roll it over to a new employer's plan. This is why it is important to estimate conservatively when you enroll.