FSA Calculator

Fsa Calculator

Updated Sep 6, 2026 By Jehan Wadia

Introduction

An FSA, or Flexible Spending Account, lets you set aside money from your paycheck before taxes are taken out. You use that money to pay for things like doctor visits, prescriptions, glasses, dental work, or day care for your kids. Because the money is pre-tax, you pay less in taxes and keep more of your pay.

This FSA calculator shows you how much you could save. Enter your salary, how often you get paid, your state, and your filing status. Then enter how much you plan to put in a Health Care FSA and a Dependent Care FSA. If you are not sure how much to put in, the tool can help you add up your likely expenses instead.

The calculator shows your federal, state, Social Security, and Medicare tax savings. It also shows what each paycheck looks like with and without an FSA, so you can see your real take-home pay. A step-by-step section shows the math behind every number, plus charts that make the results easy to read.

Use it before you sign up during open enrollment. Picking the right amount helps you save the most money and avoid setting aside more than you will actually use.

How to use our FSA Calculator

Enter your pay details, your tax info, and how much you want to put in your Flexible Spending Account. The calculator shows your yearly tax savings, your savings per paycheck, and what your FSA really costs you after taxes.

Annual Gross Salary: Type your total pay for the year before any taxes or deductions come out.

How often are you paid: Pick weekly, bi-weekly, semi-monthly, or monthly. This sets how many paychecks your FSA is split across.

State of Residence: Choose the state where you pay income tax. The tool fills in that state's top tax rate for you.

State Tax Rate Override: Change this percent if your income does not reach the top state bracket. Leave it alone if you are not sure.

Federal Marginal Tax Bracket: Leave it on auto to let the tool guess your bracket from your salary, or pick your own rate from the list.

Tax Filing Status: Select single, married filing jointly, married filing separately, or head of household. This changes your Dependent Care FSA limit and your bracket.

Health Care FSA option: Click "I know my annual amount" if you already picked a number. Click "Help me estimate my expenses" to add up your costs instead.

Annual Health Care FSA Contribution: Enter the dollar amount you plan to set aside for the year, up to the IRS limit.

Health care expense boxes: If you are estimating, type what you expect to spend on co-pays, specialty care, labs, hospital bills, prescriptions, over-the-counter items, dental, vision, and other medical costs. The tool adds them up and caps them at the IRS limit.

Dependent Care FSA skip box: Check this if you will not use a Dependent Care FSA. Your amount is set to $0.

Dependent Care FSA option: Pick "I know my annual amount" or "Help me estimate my expenses."

Annual Dependent Care FSA Contribution: Enter what you plan to set aside for child or adult care, up to your household limit.

Dependent care expense boxes: If you are estimating, type what you expect to pay for day care, an in-home provider, before and after school care, summer day camp, elder care, and other care costs.

Calculate and Reset: Click Calculate to see your results, charts, and step-by-step math. Click Reset to start over with the default numbers.

What Is a Flexible Spending Account (FSA)?

An FSA is a work benefit that lets you set aside money from your paycheck before taxes are taken out. You then use that money to pay for health care or child care costs. Because the money is pulled out before taxes, you pay less in taxes and keep more of your pay.

The Two Main Types of FSAs

Health Care FSA pays for doctor visits, co-pays, prescriptions, dental work, braces, eye exams, glasses, contacts, LASIK, and many over-the-counter items.
Dependent Care FSA pays for day care, preschool, before- and after-school care, summer day camp, a nanny or au pair, and adult day care. The care must let you (and your spouse) work or look for work. It covers kids under 13 or a disabled spouse or dependent.

These are two separate accounts with separate rules. You can use one or both.

2026 FSA Contribution Limits

Health Care FSA: $3,400 per employee, per year.
Dependent Care FSA: $7,500 per household, per year ($3,750 if you are married and file separately).

A Dependent Care FSA also cannot be more than your earned income for the year. If you are married, it cannot be more than the smaller of your income or your spouse's income.

How FSA Tax Savings Work

Money you put in an FSA skips four taxes: federal income tax, most state income taxes, Social Security tax (6.2%), and Medicare tax (1.45%). Added up, most workers save 25% to 40% of every dollar they set aside.

Here is a simple example. If you set aside $2,500 and your combined tax rate is 30%, you save about $750 in taxes. That means $2,500 of medical bills really costs you about $1,750.

Use It or Lose It

FSA money is meant to be spent within the plan year. If you do not use it, you can lose it. Some employers offer help:

A carryover of a small amount into the next year (health care FSA only), or
A grace period of up to 2½ extra months to spend last year's money.

Plans cannot offer both. Check your plan documents so you know your deadline. Because of this rule, it is smart to only set aside money you are confident you will spend.

Other Rules Worth Knowing

You pick your yearly amount during open enrollment. It comes out in equal parts from each paycheck.
You usually cannot change your amount mid-year unless you have a qualifying life event, like marriage, divorce, a new baby, or a job change.
With a Health Care FSA, your full yearly amount is available on day one, even if you have only contributed a little so far.
With a Dependent Care FSA, you can only spend money that has already been taken from your paychecks.
You generally cannot have a full Health Care FSA and an HSA at the same time.
Save your receipts. You may need to prove an expense was eligible.

Who Gets the Most From an FSA

An FSA helps most if you have steady, predictable costs, such as regular prescriptions, planned dental or vision work, braces, or weekly day care. The higher your tax bracket, the more each pre-tax dollar saves you. If your costs are hard to guess, start small and raise your amount next year.

Formulas used

Total Pre-Tax FSA Contribution

\text{Total FSA} = \text{Health Care FSA} + \text{Dependent Care FSA}

Federal and State Income Tax Savings

S_{\text{fed}} = \text{Total FSA} \times r_{\text{fed}}, \qquad S_{\text{state}} = \text{Total FSA} \times r_{\text{state}}

Social Security Tax Savings (limited by wage base)

S_{\text{SS}} = \max\left(0,\ \min\left(\text{Total FSA},\ 184{,}500 - (\text{Gross} - \text{Total FSA})\right)\right) \times 6.2\%

Medicare Tax Savings (including Additional Medicare Tax)

S_{\text{Med}} = \text{Total FSA} \times 1.45\% + \min\left(\text{Total FSA},\ \max(0,\ \text{Gross} - T_{\text{AMT}})\right) \times 0.9\%

Total Annual Tax Savings and Effective Combined Rate

S_{\text{total}} = S_{\text{fed}} + S_{\text{state}} + S_{\text{SS}} + S_{\text{Med}}, \qquad r_{\text{eff}} = \frac{S_{\text{total}}}{\text{Total FSA}}

Per-Paycheck Impact and Net Cost

\text{Net cost per paycheck} = \frac{\text{Total FSA}}{n} - \frac{S_{\text{total}}}{n}

Progressive Federal Income Tax (without FSA)

\text{Tax}_{\text{fed}} = \sum_{i} \left[\min(\text{Taxable},\ b_i) - b_{i-1}\right]^{+} \times r_i, \quad \text{Taxable} = \max(0,\ \text{Gross} - \text{Std. Deduction})

Net Take-Home Pay per Paycheck With FSA

\text{Net}_{\text{with}} = \frac{\text{Gross}}{n} - \frac{\text{Total FSA}}{n} - \frac{\max(0,\ \text{Tax}_{\text{total}} - S_{\text{total}})}{n}

Frequently asked questions

What happens to my FSA money if I quit or lose my job?

Your health care FSA usually ends on your last day of work, or at the end of that month. You can only get paid back for expenses that happened while you were still covered.

If you already spent more than you put in, you do not have to pay the difference back. If you contributed more than you spent, you lose the leftover money unless you keep the plan going through COBRA.

A dependent care FSA works differently. You can usually keep filing claims until the money already taken from your paychecks runs out.

How much should I put in my FSA?

Add up costs you know you will have. Look at last year's spending for co-pays, prescriptions, dental cleanings, glasses or contacts, and any planned procedures like braces or LASIK.

Then set aside a little less than that total. Because unused money can be lost, it is safer to guess low your first year. You can always raise the amount next open enrollment.

For day care, the number is easier. Multiply your weekly bill by the weeks you will pay, then stop at the yearly limit.

What is a limited purpose FSA?

A limited purpose FSA only pays for dental and vision costs, like cleanings, fillings, braces, eye exams, glasses, and contacts.

It exists so people with a health savings account (HSA) can still use an FSA. A regular health care FSA blocks you from putting money in an HSA, but a limited purpose FSA does not.

You get the same pre-tax savings, just on a smaller list of expenses.

Can both my spouse and I have a health care FSA?

Yes. Each of you can have your own health care FSA through your own job, and each of you can contribute up to the full yearly limit. For 2026 that is $3,400 each, or $6,800 for the couple.

Dependent care is different. That limit is per household, not per person. A married couple filing jointly can put in $7,500 total across both accounts, not $7,500 each.

Is a dependent care FSA better than the child and dependent care tax credit?

For most families in the 22% bracket or higher, the FSA wins. FSA money skips federal tax, state tax, and the 7.65% FICA tax, so you often save more than the credit gives back.

The credit can be better for lower earners, because the credit percentage is bigger when your income is small.

You cannot double dip. Any expense you pay with FSA money cannot also be used for the credit.

Can I use a dependent care FSA to pay a babysitter or a grandparent?

Yes, as long as the care lets you and your spouse work or look for work. The sitter does not need a license or a daycare center.

You must report the provider's name, address, and tax ID or Social Security number. The provider has to report that money as income.

Two people you cannot pay: your spouse, and your own child who is under 19.

Is summer camp covered by a dependent care FSA?

Day camp counts. Overnight camp does not, even if it is cheaper.

The camp must be for a child under 13, and it must let you work or look for work. Sports camps, art camps, and coding camps all qualify if the child comes home each night.

Tuition for kindergarten or higher grades does not count, but before-school and after-school care does.

What over-the-counter items can I buy with an FSA?

Since 2020, you no longer need a prescription for most drugstore items. Covered items include:

Pain relievers, cold medicine, and allergy pills
Bandages, first aid supplies, and thermometers
Sunscreen with SPF 15 or higher
Tampons, pads, and other period products
Reading glasses and contact lens solution

Things like vitamins, toothpaste, and cosmetics usually do not count unless a doctor writes a letter saying you need them for a medical reason.

Can I use my health care FSA for my spouse and kids?

Yes. You can use it for your spouse and your tax dependents, even if they are not on your health insurance plan.

You can also use it for a child up to age 26, whether or not they are your tax dependent. That rule matches the health insurance age rule.

A dependent care FSA is stricter. It only covers kids under 13 and a spouse or adult dependent who cannot care for themselves.

Does putting money in an FSA lower my Social Security benefits later?

It can, but only by a tiny amount. FSA money is not counted as Social Security wages, so it does not add to the earnings record used to figure your future benefit.

For most workers the effect is a few dollars a month at retirement, while the tax savings today are hundreds of dollars a year. If you already earn more than the Social Security wage base, there is no effect at all.

Do I have to report FSA money on my tax return?

For a health care FSA, no. The money is already left out of the wages in Box 1 of your W-2, so you get the tax break automatically. There is nothing extra to file.

For a dependent care FSA, yes. The amount shows in Box 10 of your W-2, and you file Form 2441 with your return to prove the money went to real care costs. If you do not file it, that money can be added back as taxable income.

How much can I carry over from my FSA into next year?

If your employer offers carryover, you can roll about $680 of unused health care FSA money into 2027. Employers can set a lower amount or offer none at all.

The other option some plans use is a grace period, which gives you 2½ extra months to spend last year's money. A plan can offer carryover or a grace period, not both.

Dependent care FSAs cannot use carryover, but they can have a grace period.

When can I sign up for an FSA or change my amount?

You pick your amount during open enrollment, usually in the fall for the year ahead. New hires can sign up when they start.

After that, your amount is locked for the year unless you have a qualifying life event, such as marriage, divorce, a new baby, adoption, a death in the family, or a change in your or your spouse's job.

Dependent care has one extra rule: a change in day care cost or provider also lets you adjust your amount.