Calculator inputs
Use plan-specific rates and limits from your employer materials. State tax treatment can differ, so enter the rate that matches your situation.
Example data table
These examples show how election size, employer help, and carryover rules can change the final benefit and forfeiture outcome.
| Scenario | Employee Election | Employer Added | Eligible Expenses | Carryover | Combined Tax Rate | Estimated Benefit |
|---|---|---|---|---|---|---|
| Single Employee | 2500 | 0 | 2400 | 640 | 29.65% | $741.25 |
| Family Plan | 3300 | 300 | 3500 | 640 | 34.65% | $1,143.45 |
| High Forfeiture Risk | 4200 | 0 | 3000 | 250 | 29.65% | $295.30 |
| Employer Assisted | 2800 | 500 | 3200 | 640 | 31.65% | $1,386.20 |
Formula used
1) Combined tax rate
Combined Tax Rate = Federal Rate + State Rate + Optional Social Security Rate + Optional Medicare Rate
2) Annual tax savings
Annual Tax Savings = Employee FSA Election × Combined Tax Rate
3) Available FSA funds
Total Available Funds = Employee Election + Employer Contribution
4) Unused balance, carryover, and forfeiture
Unused Balance = max(Total Available Funds − Eligible Expenses, 0)
Carryover Preserved = min(Unused Balance, Carryover Limit)
Projected Forfeiture = max(Unused Balance − Carryover Limit, 0)
5) Net annual benefit
Take-Home Reduction = Employee Election − Annual Tax Savings
Extra Expense Outside FSA = max(Eligible Expenses − Total Available Funds, 0)
Net Cost With FSA = Take-Home Reduction + Extra Expense Outside FSA − Carryover Preserved
Net Annual Benefit = Eligible Expenses − Net Cost With FSA
The model treats the election as a pre-tax payroll reduction and adjusts the value for unused balances, carryover, employer money, and any remaining expenses paid outside the account.
How to use this calculator
- Enter your annual salary for context and recordkeeping.
- Type your planned employee FSA election for the year.
- Add any employer FSA contribution offered by your plan.
- Estimate eligible annual medical, dental, or vision expenses.
- Enter the carryover amount allowed by your employer.
- Select payroll frequency to see per-paycheck deductions and savings.
- Enter your marginal federal and state tax rates.
- Include or exclude Social Security and Medicare savings as needed.
- Press Calculate savings to view the result above the form.
- Use the export buttons to download your result as CSV or PDF.
FAQs
1) What does this estimator measure?
It estimates tax savings from a healthcare FSA election, then adjusts for employer funding, expected expenses, carryover, and possible forfeiture.
2) Why can the net benefit be smaller than tax savings?
Tax savings can be reduced by unused funds that exceed your carryover allowance. Overestimating expenses usually causes the biggest drop.
3) Should I include Social Security and Medicare?
Many employees do receive FICA savings on eligible salary reductions. This calculator lets you switch them on or off to match your circumstances.
4) Does the annual salary input change the result?
The main estimate uses the rates you enter directly. Salary is included for context, review, and future customization if you add wage-based logic.
5) What is the suggested employee election field?
It estimates a safer employee election from your expense forecast, carryover allowance, and employer contribution. It helps reduce forfeiture risk.
6) Why does employer contribution raise the benefit?
Employer money increases available funds without increasing your payroll reduction. That usually lowers your personal cost and improves total benefit.
7) Can I use this for dependent care accounts?
Not directly. Dependent care accounts follow different rules and planning considerations, so a separate model is more appropriate.
8) Is this a legal or tax filing tool?
No. It is an educational estimator for benefit planning. Confirm final elections and tax treatment with plan documents or a qualified advisor.