FSA & Commuter Benefits Calculator

Maximize your open enrollment decisions with our FSA and commuter benefits calculator. See how much you save in income tax and FICA by contributing to a health FSA and pre-tax commuter benefits in 2026.

For a complete guide to 2026 limits, plan types, and FSA vs. HSA rules, see: FSA and Commuter Benefits Tax Savings Guide.

Why Pre-Tax Benefits Matter

Health FSAs and commuter benefits are cafeteria plan elections that reduce your taxable wages. Unlike 401(k) contributions, FSA and commuter deductions save both federal income tax and FICA taxes (7.65% for most employees) — making them exceptionally efficient.

For a worker in the 22% bracket, every $1,000 in pre-tax FSA contributions saves approximately $296 ($220 income tax + $76.50 FICA).

2026 Health FSA Limits

Your employer sets the actual contribution limit — it cannot exceed the IRS maximum but may be lower.

FSA Plan Types

Use-it-or-lose-it: Forfeited amounts not spent by year-end are lost. Budget conservatively.

Carryover: Up to $680 of unused funds roll to the next plan year. Amounts above the carryover limit are forfeited.

Grace period: Some plans allow spending through March 15 of the following year. Check your plan documents.

2026 Commuter Benefit Limits

The IRS indexes qualified transportation fringe benefits annually. For 2026:

Transit and parking are separate caps — if your employer offers both, you can receive up to $340/month for each.

Important: Commuter benefits are typically monthly elections. Unused monthly amounts generally do not roll over.

FSA vs. HSA: Which Is Better?

If you are HSA-eligible (enrolled in a high-deductible health plan), you generally cannot contribute to a general-purpose health FSA. Limited-purpose FSAs (dental/vision only) may still be available.

See our HSA Calculator to compare.

How Tax Savings Are Calculated

Pre-tax benefit savings = contribution × (marginal tax rate + FICA rate)

Example: $3,400 health FSA + $200/month transit ($2,400/year) = $5,800 pre-tax

Open Enrollment Strategy

Health FSA: Estimate predictable medical expenses — prescriptions, copays, planned procedures. Do not over-fund a use-it-or-lose-it plan.

Commuter benefits: If you have fixed transit or parking costs, pre-tax commuter benefits almost always make sense. Elect the lesser of your actual costs or the $340/month cap.

Dependent Care FSA: Separate from health FSA, with a $5,000 limit ($2,500 if married filing separately). Not included in this calculator but worth considering during open enrollment.

Common Mistakes

Over-funding the FSA: The biggest FSA risk is electing more than you'll spend. A $500 over-election in a use-it-or-lose-it plan costs you the full $500.

Ignoring FICA savings: Many employees focus only on income tax savings and forget the additional 7.65% FICA benefit.

Missing commuter benefits: Employers don't always promote transit and parking benefits, but they can save $1,000+ per year for regular commuters.

Key Takeaways

• 2026 health FSA limit: $3,400 with up to $680 carryover
• Commuter transit and parking: $340/month each
• Pre-tax benefits save income tax + FICA (unlike 401k, which saves income tax only)
• Budget FSA contributions to expected expenses to avoid forfeiture
• HSA-eligible employees generally cannot use a general health FSA

Related: FSA and Commuter Benefits Guide | Paycheck After-Tax Calculator | HSA Calculator

This tool is for informational purposes only and does not guarantee accuracy for your specific tax situation.