What Is an HCFSA? Limits, Eligibility, and Carryover Rules

A Health Care Flexible Spending Account, or HCFSA, is an employer-sponsored account that lets you set aside pre-tax money from your paycheck to pay for medical, dental, and vision expenses. For plan years beginning in 2026, you can contribute up to $3,400, and every dollar skips federal income tax, state income tax in most states, and the 7.65% Social Security and Medicare payroll tax.¹ The trade-off is strict: money you don’t spend in time is forfeited.

How the Tax Savings Work

Your employer deducts your HCFSA contribution from your paycheck before calculating any taxes. That means you avoid federal income tax, state income tax in most states, and FICA — the 7.65% that funds Social Security and Medicare.² Withdrawals for qualified medical expenses are tax-free too, so the money is never taxed at any point.

How much that’s worth depends on your bracket. Someone in the 22% federal bracket who contributes the full $3,400 saves roughly $1,010 in combined federal income tax and FICA, before any state savings. That FICA piece is what sets an HCFSA apart from the itemized medical deduction on your tax return, which only reduces income tax and only applies to costs above 7.5% of your adjusted gross income.

2026 Contribution Limit

The maximum employee contribution for 2026 plan years is $3,400.¹ The limit applies per employer rather than per household, so if you and your spouse each have access to an HCFSA through separate jobs, each of you can contribute up to $3,400, for a household total of $6,800. That stacking works for health care FSAs; dependent care FSAs have a shared household cap.

Your employer can set its own cap below the IRS maximum. If you don’t see the full $3,400 as an option at enrollment, check your plan documents.

Your Full Election Is Available on Day One

One feature catches most new participants off guard: your entire annual election is available on the first day of the plan year, no matter how little has actually been deducted from your paycheck yet. The IRS calls this the uniform coverage rule.³ Elect $3,400, have a $3,000 procedure in January, and you can be reimbursed in full even though only a few hundred dollars have been withheld. Your employer carries the risk if you leave before the deductions catch up, and they can’t accelerate your payroll deductions to compensate.

Who Can Enroll and When

You can participate only if your employer sponsors a Section 125 cafeteria plan, which is the legal structure that makes the pre-tax treatment possible.⁴ Self-employed people — sole proprietors, partners, and more-than-2% S-corporation owners — are not eligible, because they aren’t treated as employees under these rules.

Enrollment usually happens during your employer’s annual open enrollment window. You have to actively elect a dollar amount; there’s no default. Once the plan year starts, you can’t change your election unless you have a qualifying life event such as marriage, divorce, birth or adoption of a child, or a change in your or your spouse’s employment that affects benefits eligibility.⁵ The window to request a mid-year change is typically 30 to 60 days, depending on your plan.

The account is legally owned by your employer, not by you. That ownership shapes most of the rules that follow, including what happens to unused funds and what happens if you leave the job.

What You Can Pay For

HCFSA funds reimburse costs for treating, diagnosing, or preventing disease, plus expenses that affect any structure or function of the body.⁶ In practice, that covers:

Copayments, coinsurance, and deductibles for doctor and hospital care
Prescription drugs and insulin
Over-the-counter medications like pain relievers, allergy medicine, and cold remedies, with no prescription needed thanks to the CARES Act⁷
Menstrual care products, also made permanently eligible under the CARES Act
Dental work, including cleanings, fillings, crowns, orthodontia, and extractions
Vision care, including exams, prescription glasses, contacts, and lens solution

What you can’t buy with an HCFSA: health insurance premiums, cosmetic procedures, gym memberships, and general wellness items such as vitamins or toothpaste. A doctor’s letter of medical necessity can sometimes convert an otherwise ineligible item into a reimbursable one when it treats a diagnosed condition.

Expenses can be for you, your spouse, or your tax dependents, even if they aren’t covered under your employer’s health plan. Save documentation for every claim — usually an Explanation of Benefits or an itemized receipt showing date of service, provider, and amount. Many plans issue a debit card that pulls from the HCFSA at the register, but even card transactions often need receipt substantiation later.

The Use-It-or-Lose-It Rule

This is the real catch. Any balance left in your account at the end of the plan year above the carryover limit is forfeited.⁸ You don’t get it back as taxable income. It goes to your employer, which can apply it to plan administration costs or spread it across future contributions on a uniform basis. The IRS requires forfeiture because letting participants keep unspent money would turn the HCFSA into deferred compensation, which Section 125 prohibits.

Two relief options exist, but your employer can only offer one of them, and isn’t required to offer either.

Grace Period

A grace period gives you up to two and a half extra months after the plan year ends to incur new qualified expenses using leftover funds.⁹ For a calendar-year plan, that runs through March 15. Expenses during the grace period draw from the old balance first.

Carryover

The carryover option rolls a limited amount of unused funds into the next plan year. For 2026, the maximum carryover is $680.¹ Your employer can set a lower threshold, and anything above whatever cap they pick is forfeited. Carried-over funds don’t count against next year’s $3,400 limit, so you can still elect the full amount on top of a rollover balance.

Run-Out Period

Don’t confuse either option with the run-out period. The run-out period is a window after the plan year ends — commonly about 90 days — to submit paperwork for expenses you already incurred during the plan year. It doesn’t give you more time to spend; only more time to file. If you had an eligible charge on December 28 and haven’t sent in the receipt yet, the run-out period is what covers you.

What Happens If You Leave Your Job

Because your employer owns the account, leaving the job — by quitting, layoff, or termination — generally ends your access. You can still submit claims for qualified expenses incurred before your last day, but anything incurred after that is not reimbursable.³ Any remaining balance is forfeited.

The risk here isn’t symmetric. Day-one access means you can spend your entire annual election early in the year and leave mid-year having spent more than you contributed, and the employer absorbs the loss. But if you’ve contributed more than you’ve spent when you leave, the excess is gone. The math favors front-loading your spending.

You may be offered COBRA continuation for the HCFSA, which lets you keep using it through the end of the plan year by paying the full contribution amount plus a 2% administrative fee. It usually only pencils out when you have a significant unspent balance, particularly carryover funds that aren’t included in the COBRA premium calculation.

HCFSA or HSA?

You cannot contribute to both a standard HCFSA and a Health Savings Account in the same year. The IRS treats a general-purpose HCFSA as disqualifying coverage for HSA purposes because it can reimburse expenses before you’ve met your high-deductible plan’s deductible.¹⁰

If you’re on an HDHP and want to keep contributing to an HSA while still capturing some FSA tax savings, the workaround is a Limited Purpose FSA, sometimes labeled a LEX HCFSA. It only reimburses dental and vision expenses, leaving medical costs to flow through the HDHP and HSA.¹¹ The same $3,400 annual limit applies.¹

The core differences come down to ownership and time horizon. An HSA belongs to you, follows you between jobs, rolls over indefinitely, and can be invested. An HCFSA belongs to your employer, stays behind when you leave, and uses it-or-lose-it. The HCFSA’s advantage is day-one access to the full balance and FICA savings on every dollar run through payroll. If you expect to spend the money this year on predictable costs, the HCFSA often wins. If you’re building a long-term health care reserve, the HSA does.

Picking Your Election Amount

The cost of overshooting is forfeited money. The cost of undershooting is forgone tax savings. A few minutes of estimating before open enrollment handles most of the risk on both sides.

Start with what you can predict: recurring prescriptions, planned dental work, scheduled procedures, the copayments from your regular visits, your annual eye exam, and glasses or contacts you replace on a cycle. If you have kids, build in a cushion for the sick visits and minor injuries that tend to arrive whether you plan for them or not.

Then factor in which relief option your plan offers. A $680 carryover gives you room to lean slightly high. A grace period gives you two and a half extra months but no rollover. Neither option means you should err on the conservative side, because forfeiting $500 wipes out the tax savings on that amount and then some.

One last distinction worth keeping straight: an HCFSA is not a dependent care FSA. The dependent care account covers child care and elder care, has a separate $5,000 household limit, and runs as a completely separate election with its own balance. If your employer offers both, you elect them independently.

1
Internal Revenue Service. Revenue Procedure 2025-32
2
FSAFEDS. FAQs – Why Should I Use an FSA for Health Care Expenses Rather Than Deducting the Expenses on My Income Tax Return
3
Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
4
Office of the Law Revision Counsel. 26 US Code 125 – Cafeteria Plans
5
FSAFEDS. FAQs – What Is a Qualifying Life Event
6
Internal Revenue Service. Topic No. 502 – Medical and Dental Expenses
7
Internal Revenue Service. IRS Outlines Changes to Health Care Spending Available Under CARES Act
8
FSAFEDS. FAQs – What Is the Use or Lose Rule
9
Internal Revenue Service. IRS – Eligible Employees Can Use Tax-Free Dollars for Medical Expenses
10
Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
11
FSAFEDS. Limited Expense Health Care FSA