HSA vs FSA Calculator 2026

HSAs and FSAs are both tax-advantaged accounts for medical expenses, but with key differences. HSAs are only available to those with High-Deductible Health Plans (HDHPs), are portable (you own them after leaving your job), allow investment growth, and carry over unused funds indefinitely. FSAs are employer-controlled, work with any insurance plan, don't allow investment growth, and have a use-it-or-lose-it rule (though up to $620 can carry over). HSAs have higher contribution limits ($4,400 individual/$8,750 family in 2026) versus FSAs ($3,300 in 2026). If you qualify for an HSA, it's generally superior due to tax-free growth and portability.

For 2026, HSA contribution limits are $4,400 for self-only coverage and $8,750 for family coverage. These limits include both employee and employer contributions combined. If you're age 55 or older, you can contribute an additional $1,000 catch-up contribution. You must have an HDHP (minimum deductible $1,700 self-only or $3,400 family) to be eligible. Contributions can be made until April 15 of the following year for the prior tax year. Contributions reduce your taxable income, providing immediate tax savings plus tax-free growth if invested.

Yes, HSA funds can be invested in stocks, bonds, mutual funds, and ETFs once your account balance exceeds a certain threshold (typically $2,000-2,500 depending on your provider). Earnings grow tax-free. However, unlike retirement accounts, you can withdraw money for qualified medical expenses at any time without penalty or taxes. Many people keep a portion in cash for immediate medical needs and invest the remainder for long-term growth. This dual nature makes HSAs extremely powerful retirement savings vehicles - at age 65, unused HSA balances can be withdrawn for any purpose (though non-medical withdrawals are taxed like traditional IRAs).

The HSA triple tax advantage consists of: (1) Tax-deductible contributions that reduce your current taxable income and lower your tax bill (saving 20-24% in federal taxes), (2) Tax-free growth when HSA funds are invested and earn returns that aren't taxed, and (3) Tax-free withdrawals for qualified medical expenses. This three-part benefit is unique and incredibly powerful. After age 65, the first two benefits remain, but non-medical withdrawals become subject to income tax (though no penalty). Over decades, this compounding effect can turn HSA savings into substantial wealth for retirement healthcare costs.

FSAs are subject to a use-it-or-lose-it rule: any unused funds at year-end are forfeited to your employer. However, employers can offer a grace period (up to 2.5 months into the new year) to use remaining funds, or allow up to $620 to carry over into the next year. Check your plan documents to see which option your employer offers. To avoid losing money, estimate conservatively how much you'll spend on eligible medical expenses (copays, deductibles, prescriptions, vision/dental). You can change your FSA election during open enrollment or after qualifying life events like marriage or birth.

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