FSA vs HSA Calculator
Compare Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA). Estimate your tax savings and see which plan keeps more money in your pocket.
Combined Federal, State, and Payroll tax bracket.
Tax Savings Created
*Some FSAs allow up to a $640 rollover or a 2.5-month grace period, but standard FSAs are "use it or lose it".
FSA vs. HSA: Which Health Account is Better for You?
Choosing between a Flexible Spending Account (FSA) and a Health Savings Account (HSA) during open enrollment can be confusing. Both accounts offer fantastic tax advantages by allowing you to set aside pre-tax dollars for medical expenses. However, their rules regarding eligibility, contribution limits, and what happens to your money at the end of the year are vastly different. Our free FSA vs HSA Calculator helps you visualize the math behind both options.
What is a Flexible Spending Account (FSA)?
An FSA is an employer-sponsored account that allows you to contribute pre-tax money to pay for out-of-pocket healthcare costs like co-pays, deductibles, prescriptions, and medical equipment. The most significant advantage of an FSA is that your entire annual election amount is available on day one of your plan year.
However, the major drawback is the "Use It or Lose It" rule. If you do not spend your FSA funds by the end of the plan year, you forfeit the remaining balance to your employer. (Note: Some employers offer a slight grace period or allow a small rollover of up to roughly $640, but the core risk remains).
What is a Health Savings Account (HSA)?
An HSA is a personal savings account reserved for individuals enrolled in a High Deductible Health Plan (HDHP). Unlike an FSA, an HSA is fully owned by you, not your employer. It comes with unparalleled triple-tax advantages:
- Contributions are tax-deductible (or pre-tax if through payroll).
- The money in the account grows tax-free. You can even invest HSA funds in the stock market.
- Withdrawals for qualified medical expenses are 100% tax-free.
Most importantly, HSA funds roll over year after year. You never lose your money. Because of this, many financial advisors consider the HSA to be one of the greatest retirement savings vehicles available in the United States.
Key Differences at a Glance
- Eligibility: Anyone whose employer offers an FSA can open one. To open an HSA, you must be enrolled in a qualifying High Deductible Health Plan (HDHP) and have no other disqualifying health coverage.
- Portability: If you leave your job, your FSA usually stays with your employer (you lose it). Your HSA stays with you forever.
- Employer Contributions: Employers frequently contribute "free money" to your HSA to offset the high deductible of your health plan. Employers rarely contribute to FSAs.
- Investment Potential: FSAs hold cash. HSAs can be invested in mutual funds, ETFs, and stocks once a minimum balance is reached.
How to Use This Calculator
To make the best decision, you need to estimate your upcoming medical expenses accurately:
- Step 1: Estimate Tax Rate: Enter your approximate combined marginal tax rate (Federal income tax + State tax + FICA). 22% is a safe average for many Americans.
- Step 2: Estimate Expenses: Look at your medical spending from last year. Do you expect similar costs? Include dental, vision, and prescriptions.
- Step 3: Input Contributions: Enter how much you plan to contribute to either account. If your employer gives you $500 a year for an HSA, enter that in the Employer Contribution box.
The Verdict
If you are relatively healthy, can afford a higher deductible, and want to build a long-term, tax-free nest egg, the HSA is almost always the mathematical winner. However, if you have high, predictable medical expenses (like planned surgery or expensive monthly prescriptions) and prefer the safety of a low-deductible health plan, the FSA provides immediate, risk-free tax savings for those guaranteed costs.