What is the FSA use-it-or-lose-it rule?

The use-it-or-lose-it rule means any FSA funds not spent on eligible expenses by the plan deadline are forfeited. You don't get the money back. This is the main drawback of FSAs compared to HSAs, which roll over indefinitely.

What is the FSA grace period?

Some employers offer a grace period of up to 2.5 months after the plan year ends. During this time, you can still use the previous year's FSA funds. For a calendar-year plan, the grace period extends through March 15 of the following year.

What is the FSA carryover option?

The carryover option lets you roll over up to $640 (2026 limit) of unused FSA funds into the next plan year. Employers can offer either a grace period or a carryover, but not both. Not all employers offer either option.

What are common FSA-eligible expenses?

Eligible expenses include doctor copays, prescriptions, OTC medications, dental work, vision care, contact lenses, mental health copays, first aid supplies, sunscreen, and medical equipment. The IRS publishes a comprehensive list in Publication 502.

How much should I contribute to my FSA?

Estimate your predictable annual medical expenses: copays, prescriptions, dental work, glasses/contacts, and expected procedures. It's better to slightly underestimate than to forfeit money. Start conservative and increase next year if you consistently spend more.

Can I change my FSA election mid-year?

Generally no, unless you have a qualifying life event (marriage, birth, job change). This is why careful estimation during enrollment is important. Some plans allow a mid-year decrease if you're unlikely to spend the full amount.

What is the 2026 FSA contribution limit?

The healthcare FSA contribution limit for 2026 is $3,200. Dependent care FSAs have a separate limit of $5,000 ($2,500 if married filing separately). These limits are set by the IRS and adjusted annually for inflation.

FSA Use-It-or-Lose-It Calculator

Calculate how much FSA money you risk forfeiting if unspent by year-end. Plan spending to avoid losing your pre-tax healthcare dollars.

Annual FSA Election

Claims Submitted

Plan Option

Carryover Limit

Months Remaining

$1,800.00 used$1,050.00 remaining

Remaining Balance

$1,050.00

63.2% of election used

Amount at Risk

$410.00

Will be forfeited if unspent

Safe (Carryover)

$640.00

Rolls to next year

Monthly Spend Needed

$136.67

To avoid forfeiture

Planning notes, formulas, and examples

About the FSA Use-It-or-Lose-It Calculator

Flexible Spending Accounts (FSAs) save you money through pre-tax contributions, but they come with a catch: the use-it-or-lose-it rule. Any funds remaining at the end of the plan year are forfeited — your employer keeps them. For 2026, you can contribute up to $3,200 to a healthcare FSA.

Some employers offer relief: a grace period (up to 2.5 extra months) or a carryover (up to $640 into the next year). But even with these options, over-contributing means lost money. Americans forfeit an estimated $7.2 billion in FSA funds annually.

This calculator tracks your FSA balance, projects whether you'll use it all, and suggests eligible expenses to spend remaining funds on before the deadline. These are educational estimates only and not actual plan guarantees.

When This Page Helps

Losing FSA money is throwing away pre-tax savings. This calculator helps you track your balance, identify the deadline, and plan spending so you use every dollar you've set aside — whether on prescriptions, glasses, dental work, or other eligible expenses.

How to Use the Inputs

Enter your total annual FSA election (contribution amount).
Enter total claims already submitted and reimbursed.
Select whether your plan offers a grace period or carryover.
Enter the carryover limit if applicable.
Review how much you must spend by the deadline.
Browse the list of eligible expenses to spend remaining funds.

Formula used

Remaining Balance = Annual Election − Claims Submitted
At-Risk Amount = Remaining Balance − Carryover Limit
Deadline = Plan Year End (or + Grace Period)
Monthly Spend Needed = At-Risk Amount / Months Remaining

Example Calculation

Result: $410 at risk of forfeiture

Balance: $2,850 − $1,800 = $1,050 remaining. Carryover saves $640, leaving $410 at risk. With 3 months left, you need to spend ~$137/month on eligible expenses to avoid losing that $410.

Tips & Best Practices

Stock up on eligible items like contact lens solution, first aid supplies, sunscreen (SPF 15+), and OTC medications.
Schedule dental cleanings, eye exams, or physical therapy before your deadline.
Prescription sunglasses and reading glasses are FSA-eligible.
Many FSA-eligible products are available on Amazon and FSA Store websites.
Set calendar reminders 3 months before your plan year ends to review your balance.
These are educational estimates — check your specific plan documents for eligible expenses and deadlines.

The Cost of FSA Forfeiture

Americans forfeit an estimated $7.2 billion in FSA funds annually — an average of about $400 per participant. Since FSA contributions are pre-tax, forfeiting $400 is like throwing away $500–$550 in gross income (depending on your tax bracket). Proper planning eliminates this waste entirely.

Year-End Spending Strategies

If you have remaining FSA funds, prioritize: (1) scheduled healthcare you've been postponing, (2) upcoming prescriptions you can fill early, (3) elective items like prescription sunglasses or orthotics, and (4) eligible OTC products and supplies you'll use anyway.

FSA vs HSA Decision

If you have access to an HSA-eligible high-deductible plan, consider the HSA instead. HSA funds never expire, grow tax-free, and belong to you permanently. FSAs only make sense if you don't qualify for an HSA or need the lower-deductible plan the FSA accompanies.

Sources & Methodology

Last updated: February 9, 2026

Frequently Asked Questions

The use-it-or-lose-it rule means any FSA funds not spent on eligible expenses by the plan deadline are forfeited. You don't get the money back. This is the main drawback of FSAs compared to HSAs, which roll over indefinitely.