HSA Calculator
For informational purposes only. FSA limits and rollover rules vary by employer plan. Verify current limits with your plan administrator or IRS Publication 969.

HSA vs FSA Calculator

Enter the same contribution amount and tax bracket for both accounts. The side-by-side comparison shows where each account saves more — and highlights the HSA's long-term investment advantage.

Shared Inputs

%
HSA
$
%
Federal Tax Saved—
FICA Saved (payroll)—
State Tax Saved—
Annual Tax Savings—
Balance After 20 Yrs (tax-free growth)—
Tax Saved Over 20 Yrs—
Rolls over forever
Invest unused funds
FICA savings (payroll)
Requires qualifying HDHP
FSA
$
Federal Tax Saved—
FICA Saved (payroll)—
State Tax Saved—
Annual Tax Savings—
Balance After Same Period—
Tax Saved Over Same Period—
Use-it-or-lose-it rule
Cannot invest balance
FICA savings (payroll)
Works with any health plan

Key Differences: HSA vs FSA

Feature HSA FSA
Requires HDHP enrollmentYesNo
2025 contribution limit (self)$4,300$3,300
RolloverUnlimited, foreverUp to $660 (employer option)
Investment optionYes (tax-free growth)No
FICA savings via payrollYesYes
State tax deductionMost states (not CA/NJ/AL)Most states
Post-65 non-medical useAllowed (taxed as income)Not applicable
Portable if job changesYesNo (employer-tied)

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Frequently Asked Questions

Can I have both an HSA and an FSA at the same time?

Generally no. If you are enrolled in a qualifying HDHP and contribute to an HSA, you cannot also contribute to a general-purpose FSA. However, a "Limited-Purpose FSA" (covering only dental and vision expenses) is allowed alongside an HSA.

What happens to unused FSA funds at year-end?

FSA funds typically follow a "use it or lose it" rule. Employers may optionally allow either a grace period (2.5 months) or a rollover of up to $660 (2024 limit; verify for your plan year) into the following year — but not both. Unused HSA funds roll over indefinitely with no penalty.

Which account is better if I am healthy and rarely use healthcare?

An HSA is generally better for healthy individuals who anticipate low medical spending. You can invest unused HSA funds and let them grow tax-free for decades, effectively turning the HSA into a stealth retirement account for healthcare costs.

Does my employer have to offer an HSA?

Your employer does not need to offer an HSA — you can open one directly with an HSA provider (bank, credit union, or brokerage) as long as you are enrolled in a qualifying HDHP. However, employer contributions and payroll deductions require a workplace plan.

What is the 2025 FSA contribution limit?

For 2025, the IRS health FSA contribution limit is $3,300 per employee (Rev. Proc. 2024-40). Dependent care FSAs have a separate limit of $5,000 per household ($2,500 if married filing separately).