HSA vs FSA: Key Differences and 2026 Contribution Limits

What is a Health Savings Account (HSA)?

A Health Savings Account (HSA) is a tax-advantaged account available to individuals enrolled in a High Deductible Health Plan (HDHP). For 2026, an HDHP requires a minimum deductible of $1,700 for self-only coverage and $3,400 for family coverage, and HSA eligibility has expanded to include all ACA Marketplace Bronze and Catastrophic plans. The HSA offers an unparalleled triple-tax advantage: contributions are made pre-tax (exempt from federal income, Social Security, and Medicare taxes), investment growth is completely tax-free, and withdrawals used for qualified medical expenses are tax-free at any age. Because you own the account, the money rolls over forever, never expires, and is entirely portable even if you leave your job. Additionally, you can invest your accumulated HSA balance for long-term compound growth. To determine your optimal savings strategy, use our HSA Contribution Calculator.

What is a Flexible Spending Account (FSA)?

A Flexible Spending Account (FSA) is an employer-sponsored benefit that allows employees to set aside pre-tax dollars for eligible out-of-pocket health care costs. Unlike an HSA, a healthcare FSA does not require you to be enrolled in an HDHP. However, FSAs operate under a strict "use-it-or-lose-it" rule, meaning you must determine your contribution amount at the start of the year and funds typically expire at the end of the plan year. The money inside an FSA cannot be invested. Employers may optionally offer one of two exceptions to mitigate forfeited funds: a grace period of up to 2.5 months to incur new expenses, or a carryover allowance. For 2026, the maximum IRS health FSA carryover limit is $680.

2026 Contribution Limits Compared

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