HSA vs FSA: Which Health Account Is Better?

The main difference is that an HSA (Health Savings Account) requires enrollment in a High Deductible Health Plan (HDHP), rolls over unused funds indefinitely, and allows you to invest your balance for long-term growth. An FSA (Flexible Spending Account) is available with most employer health plans but operates on a use-it-or-lose-it basis — you can carry over up to $660 in 2025 but forfeit anything above that at year-end.

Generally no — if you have an HSA, you cannot also contribute to a general-purpose FSA, as it would disqualify your HSA. However, you can have an HSA alongside a Limited-Purpose FSA (LPFSA), which is restricted to dental and vision expenses only. This combination lets you maximize your HSA while still using pre-tax dollars for dental and vision costs.

For 2025, the HSA contribution limit is $4,300 for self-only HDHP coverage and $8,550 for family coverage. Those aged 55 or older can contribute an additional $1,000 catch-up contribution. The FSA contribution limit for 2025 is $3,300 per employee (set by the employer plan). The FSA carryover limit is $660 for 2025.

Both HSAs and FSAs reduce your taxable income with pre-tax contributions, saving you federal income tax and FICA taxes. However, the HSA offers a unique triple tax advantage: contributions are pre-tax, investment growth is tax-free, and qualified withdrawals for medical expenses are also tax-free. This makes the HSA the more powerful long-term tax savings vehicle, especially if you invest your balance and use it in retirement for healthcare costs.