FSA and Commuter Benefits: Tax Savings Guide

A health FSA, a dependent care FSA, and pre-tax commuter benefits all do the same basic thing: they let you pay for a specific category of expense with wages that are never hit by federal income tax or Social Security and Medicare tax. The value is large, but each account has its own limits and forfeiture rules, and open enrollment is usually your only chance to choose the amount.

Short answer: for 2026 you can set aside up to $3,400 in a health FSA (with up to $680 carryover if your plan allows), up to $7,500 per household in a dependent care FSA, and up to $340 a month each for transit and parking. In the 22% bracket every dollar saves about 29.65 cents in federal income and payroll tax. Money left in a health or dependent care FSA at the end of the plan year (and any grace period) is generally forfeited, so elect what you can predict.

To put numbers on your own elections, use the FSA & commuter benefits calculator.

What are the 2026 FSA and commuter benefit limits?

Your employer can set lower limits than these, and it decides which benefits to offer at all. The health FSA limit is per employee, so spouses who each have access through their own employers can each elect up to $3,400. The dependent care limit is per household.

How does a health FSA work?

A health flexible spending arrangement is part of an employer's section 125 cafeteria plan. At open enrollment you choose an annual amount; your employer deducts it in equal pieces from each paycheck before taxes; you get reimbursed (or pay with an FSA debit card) for qualified medical expenses. Self-employed people aren't eligible for FSAs, per IRS Publication 969.

Three rules shape how it behaves:

• Uniform coverage. Your full annual election is available from the first day of the plan year, regardless of how much you've contributed so far. If you elect $3,400 and have a $2,000 surgery in February, the FSA reimburses all $2,000 even though only a few hundred dollars have come out of your pay.
• Substantiation. You need a third-party statement (an explanation of benefits or an itemized receipt) showing the expense and the date, plus a statement that it wasn't reimbursed elsewhere. The FSA can't pay for future expenses in advance.
• Elections are locked. You can change your election mid-year only for a qualifying change such as marriage, divorce, birth or adoption, or a change in employment, and only if your plan permits.

What can you pay for with a health FSA?

Pub 969 confirms that over-the-counter medicine and menstrual care products are covered expenses. Eligible expenses can be for you, your spouse, your dependents, and your children through the end of the year they turn 26.

What happens to unused FSA money: use-or-lose, carryover, or grace period?

By default, a health FSA is "use it or lose it": money left at the end of the plan year is forfeited to the plan. Employers may soften that with one of two options (a plan can't offer both):

Don't confuse either one with a run-out period, which is simply extra time to submit claims for expenses you already incurred during the plan year. Most plans have one; it doesn't let you incur new expenses.

Example: you elect $2,500 in a carryover plan and spend $1,900 by December 31, 2026. The remaining $600 is under the $680 cap, so all of it carries into 2027 on top of your new election. If you'd spent only $1,500, $680 would carry over and $320 would be forfeited.

HSA warning. A general-purpose FSA, including leftover money during a grace period, can block HSA contributions. If you're switching to a high-deductible health plan with an HSA, spend the FSA down to zero by the end of the plan year or ask whether the carryover can go into a limited-purpose FSA. Compare the two accounts with the HSA calculator; for 2026 the HSA limits are $4,400 self-only and $8,750 family under Rev. Proc. 2025-19.

How does a dependent care FSA work, and is it better than the child care credit?

A dependent care FSA (a dependent care assistance program) pays for care that lets you, and your spouse if married, work or look for work. For 2026 the tax-free limit rose to $7,500 per household ($3,750 married filing separately).

Who qualifies: a child under 13, or a spouse or dependent who is physically or mentally unable to care for themselves and lives with you more than half the year.

Eligible costs: daycare, preschool, before- and after-school care, summer day camp, and in-home care such as a nanny or babysitter while you work. Overnight camp and tuition for kindergarten and up don't qualify.

Rules that differ from a health FSA:

• No uniform coverage: you can be reimbursed only up to what you've contributed so far.
• The tax-free amount can't exceed the earned income of the lower-earning spouse.
• The $680 carryover doesn't apply to dependent care FSAs; a grace period can.

Interaction with the credit. Every dollar excluded through the dependent care FSA reduces the $3,000 (one child) or $6,000 (two or more) of expenses you can use for the child and dependent care credit on Form 2441. For 2026 the credit's maximum rate rose from 35% to 50%, per Pub 505, with the rate falling as income rises.

Example: married couple, two children, $14,000 of daycare, 22% bracket.

• Dependent care FSA of $7,500: savings = $7,500 × (22% + 7.65%) = $2,223.75. The credit expense limit becomes $6,000 − $7,500 = $0.
• No FSA, credit only: $6,000 × your Form 2441 credit percentage. The credit would need a rate above $2,223.75 ÷ $6,000 = 37.1% to beat the FSA.

Families whose income gives them a high credit percentage should run both numbers. You can also split: a $4,000 election leaves $2,000 of expenses eligible for the credit.

How do pre-tax commuter benefits work?

Qualified transportation fringe benefits let your employer pay, or let you pay through salary reduction, for:

• Transit passes: passes, tokens, fare cards, or vouchers for bus, rail, ferry, or other mass transit.
• Commuter highway vehicles (vanpools): a vehicle that seats at least six adults besides the driver, used at least 80% for commuting with seats at least half full.
• Qualified parking: parking at or near your workplace, or near the station or lot where you board transit, a vanpool, or a carpool. Parking near your home doesn't count.

For 2026 the limits are $340 a month for transit and vanpool combined and a separate $340 a month for parking. Anything above the limit is taxable wages.

Unused commuter money. Commuter elections are usually monthly and can be changed for future months. Treasury regulations (26 CFR 1.132-9, Q&A-14 and Q&A-15) let a plan carry unused salary-reduction amounts forward to later months, but you can't take them back as cash, including when you leave the job. Whether the balance stays usable after you leave is up to the plan.

What changed in 2026:

• No bike benefit. The One Big Beautiful Bill Act (P.L. 119-21) permanently eliminated the exclusion for qualified bicycle commuting reimbursements for tax years beginning after 2025, as Pub 15-B notes. Bike reimbursements are taxable wages.
• Employers still can't deduct commuting costs. Under Code sections 274(a)(4) and 274(l), as Pub 15-B explains, an employer gets no deduction for qualified transportation benefits, whether it pays them directly, reimburses them, or runs them through salary reduction, and none for other commuting transportation except for employee safety. The exclusion for you is unaffected; this is why many employers offer only salary-reduction plans rather than paying for transit themselves.

Self-employed people and more-than-2% S corporation shareholders aren't treated as employees for this exclusion.

How much can a household save? A full example

Married couple filing jointly, 22% bracket, state income tax of 5%. One spouse elects a $2,800 health FSA; they elect $7,500 for dependent care; the commuting spouse elects $250 a month for transit ($3,000).

The 5% state figure assumes the state follows the federal exclusions, which most income-tax states do; check yours. And remember the dependent care FSA here uses up the child care credit's expense limit. If either spouse earns more than the $184,500 Social Security wage base, the FICA column for that spouse falls to 1.45% (2.35% above $200,000).

How should you decide at open enrollment?

1. Check your health plan first. If you're choosing an HSA-qualified high-deductible plan, skip the general-purpose FSA and ask about a limited-purpose FSA instead.
2. List predictable medical costs. Recurring prescriptions, orthodontic payments, glasses or contacts, therapy copays, and scheduled procedures. Elect that total, plus up to your plan's carryover if it has one.
3. Size the dependent care FSA against your childcare bill and the credit. If both spouses work and you pay at least $7,500 a year in care, the full election usually wins at the 22% bracket and above.
4. Elect commuter benefits for the months you'll commute, and revisit if your hybrid schedule changes.
5. Confirm deadlines. Note the plan year end, any grace period, and the run-out date for claims, and put them on your calendar.

To see what the elections do to each paycheck, follow the steps in how to calculate your paycheck after taxes or run the paycheck after-tax calculator.

Common mistakes

• Over-electing the health FSA. A forfeited dollar costs you about 70 cents net at the 22% bracket; it outweighs the tax saved on two dollars you do spend.
• Using the FSA card for ineligible items and then ignoring substantiation requests, which can lead to the card being suspended or the amount being treated as taxable.
• Missing the run-out deadline for claims, which forfeits money you already earned the right to.
• Claiming the same childcare expense twice, once through the dependent care FSA and again for the credit.
• Assuming the commuter benefit covers tolls or most rideshares. It covers transit fare media, qualifying vanpools, and parking only.
• Counting on last year's numbers. All four limits changed for 2026; the 2026 IRS inflation adjustments guide lists the current figures.