Choosing how much to contribute to your Flexible Spending Account is one of the most important open enrollment decisions you'll make. Contribute too little and you miss out on tax savings. Contribute too much and you risk forfeiting money at the end of the year. This guide walks you through exactly how to think about it for 2026.
2026 FSA Contribution Limits
For the 2026 plan year, the IRS sets the following limits:
| Account Type | 2026 Limit | 2025 Limit |
|---|---|---|
| Healthcare FSA (individual) | $3,400 | $3,300 |
| Healthcare FSA (married, separate employers) | $3,400 each | $3,300 each |
| Limited Purpose FSA (dental/vision only) | $3,400 | $3,300 |
| Dependent Care FSA (DCFSA) | $7,500 | $5,000 |
| FSA Carryover Maximum | $660 | $640 |
Note: The DCFSA limit increase to $7,500 for joint filers was enacted under the One Big Beautiful Bill Act in late 2025.
Step 1: Estimate Your Predictable Medical Expenses
Start with the expenses you know will happen. Pull up last year's medical spending and list out recurring costs:
- Prescriptions: Monthly medications, refill costs. Check your pharmacy records.
- Doctor visits: Annual physicals, specialist copays, sick visits. The average American makes 3-4 doctor visits per year.
- Dental: Two cleanings ($75-200 each), any planned fillings or crowns.
- Vision: Annual eye exam ($50-100), contacts or glasses ($100-400/year).
- Therapy/mental health: Weekly or biweekly copays can add up to $1,000-3,000/year.
- OTC medications: Allergy meds, pain relievers, cold medicine you buy regularly ($200-500/year for most families).
Step 2: Factor in Planned Procedures
Are you planning any medical work this year? Common high-dollar FSA-eligible expenses include:
- Orthodontia: $3,000-7,000 (often spread across plan years)
- LASIK: $2,000-4,000 per eye
- Dental implants: $3,000-5,000 per tooth
- Physical therapy: $50-100 per session, 10-20 sessions
- Fertility treatments: $2,000-15,000+ depending on treatment
If you have a planned procedure, add the estimated out-of-pocket cost to your base amount.
Step 3: Account for Your Safety Net
Your employer may offer one of two forfeiture-protection options:
- Carryover: Up to $660 rolls into the next plan year automatically. This means you can safely over-contribute by up to $660 without risk.
- Grace period: An extra 2.5 months after your plan year ends to spend remaining funds. No dollar cap — the full balance carries into the grace period.
Check with your HR department to see which option your plan offers. If you have a $660 carryover, you can be more aggressive with your contribution knowing that cushion exists.
Step 4: Calculate Your Tax Savings
The whole point of an FSA is the tax break. Every dollar you contribute avoids:
- Federal income tax (10-37% depending on your bracket)
- State income tax (0-13% depending on your state)
- FICA taxes (7.65% for most workers)
For someone in the 22% federal bracket paying 5% state tax, the combined savings rate is about 34.65%. That means a $3,400 FSA contribution saves you roughly $1,178 in taxes. That's real money.
Common Contribution Strategies
| Strategy | Best For | Contribution Range |
|---|---|---|
| Conservative | Healthy individual, minimal medical needs | $500-1,000 |
| Moderate | Regular prescriptions, annual dental/vision | $1,000-2,000 |
| Aggressive | Family, ongoing treatments, planned procedures | $2,000-3,400 |
| Maximum | Known large expenses (LASIK, orthodontia, etc.) | $3,400 |
The 5 Biggest Mistakes People Make
- Contributing $0 because they're "healthy" — Even healthy people spend $500+ per year on eligible items like sunscreen, allergy meds, contact solution, and OTC pain relievers. You're leaving free tax savings on the table.
- Maxing out without planning — Contributing $3,400 when you typically spend $1,500 on medical expenses means you'll scramble at year-end or forfeit money.
- Forgetting about OTC items — Since the CARES Act, OTC medications are FSA-eligible without a prescription. This significantly expands what counts.
- Not adjusting for life changes — Getting married, having a baby, or starting new medications should all trigger a contribution adjustment.
- Ignoring the carryover — If your plan allows $660 carryover, factor that into your math. It's a safety net, not wasted space.
A Simple Formula
Here's a quick way to estimate your ideal contribution:
(Last year's medical expenses) + (Planned procedures) + ($200-400 buffer for unexpected needs) = Your target contribution
If your plan has a $660 carryover, you can add up to $660 to that number with minimal risk. Cap it at $3,400 (the 2026 IRS maximum).
Track It So You Don't Lose It
The best contribution amount means nothing if you forget to spend it. SpendRebel tracks your FSA balance in real time, sends smart reminders as your deadline approaches, and suggests eligible items based on your remaining balance. It's free — sign up in 2 minutes and never forfeit another dollar.