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FSA Contribution Calculator

Enter your expected medical expenses to plan your FSA contribution.

How it is calculated

The tool caps your planned election at the annual limit, spreads it over the pay periods, and estimates the tax saved: contribution = min(expected expenses, limit), per paycheck = contribution ÷ pay periods and tax savings = contribution × 25%. Expected expenses and the limit are annual dollar amounts; pay periods is how many paychecks you receive a year.

If you leave pay periods empty it assumes 26 (biweekly) and if the limit is empty it uses $3,400, the 2026 health FSA limit. The limit is a field you can change, because the IRS adjusts it from year to year and dependent-care accounts have a different limit; check your plan for the current figure. The 25% savings rate is fixed in the tool, not your actual marginal rate, so treat it as a rough guide. Employer carryover or grace-period rules are not modelled.

Worked example

You expect $2,800 of medical costs and are paid 24 times a year (twice a month). The limit field says $3,400. Contribution = min(2,800, 3,400) = $2,800.00. Per paycheck = 2,800 ÷ 24 = $116.67. Estimated tax savings = 2,800 × 0.25 = $700.00, so the net cost of that care is about $2,100 if your rate really is 25%. If you expected $5,000 instead, the contribution would be held at the $3,400 limit.

Try this example →

Common mistakes

  • Counting pay periods wrongly: 26 for biweekly, 24 for twice a month, 12 for monthly. A wrong count changes the per-paycheck deduction.
  • Assuming the 25% saving is your own tax rate. It is a fixed estimate, and your real saving depends on your federal bracket, state tax and payroll taxes.
  • Leaving an out-of-date limit in the limit field. Check the current IRS figure and your plan's rules.
  • Electing the maximum when expenses are uncertain. Money left unspent may be forfeited at year-end, subject to your employer's carryover or grace period.
  • Entering the amount for a dependent-care FSA with the health FSA limit; the two accounts have different caps.

About this calculator

A Flexible Spending Account (FSA) lets US employees set aside part of their paycheck, before income and payroll taxes are calculated, to pay for eligible medical or dependent-care expenses — which effectively gives you a discount on those costs equal to your marginal tax rate. Your annual election is capped at an IRS-set limit that’s adjusted for inflation each year, and whatever amount you elect is divided evenly across your paychecks for the plan year as a per-paycheck payroll deduction.

Because most FSAs are “use it or lose it” — unspent funds are forfeited at year-end, though many employers allow a small carryover or a short grace period — employees have to estimate their coming year’s medical expenses carefully rather than over-contributing. HR and benefits teams point employees to this kind of calculation during open enrollment. From the medical costs you expect, it suggests an annual FSA election (capped at the IRS limit), the deduction per paycheck and roughly how much tax you save by paying with pre-tax money.

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Comments (1)

  • Editorial team

    For 2,800 USD of expected costs over 24 paychecks, the tool gives 116.67 USD per paycheck; for 5,000 USD it stops at the limit field, which arrives pre-filled with the 2026 figure of 3,400, and shows 130.77 USD over 26 paychecks. Change that field if your plan states a different cap. The 25 percent saving is a flat guess, so estimate spending from last year's receipts rather than from the tax benefit. What type of expense are you budgeting for?

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