What is the difference between an FSA and an HSA?▼
The biggest differences are ownership and rollover. An HSA is yours forever - funds roll over indefinitely and you keep the account if you leave your job. An FSA is employer-owned with use-it-or-lose-it rules. HSAs also require a High Deductible Health Plan (HDHP), while FSAs work with any employer health plan. HSAs can be invested for tax-free growth; FSAs cannot. In 2026, HSAs allow up to $4,400 (individual) or $8,750 (family); FSAs cap at $3,300.
Is an HSA better than an FSA?▼
For most people who qualify, yes. HSAs offer unlimited rollover, investment options, portability, and higher contribution limits. The triple tax advantage (tax-deductible contributions, tax-free growth, tax-free withdrawals for qualified medical expenses) makes HSAs the most powerful tax-advantaged account available. However, if you don't have access to an HDHP or have predictable annual medical costs you want to cover pre-tax, an FSA can still save you money.
Can I have both an HSA and an FSA?▼
You cannot have a general-purpose FSA and an HSA at the same time. However, you can pair an HSA with a Limited-Purpose FSA (which only covers dental and vision expenses) or a Dependent Care FSA (which is a separate account type for childcare costs). The IRS treats LP-FSAs and DCFSAs as compatible with HSA contributions because they don't reimburse general medical expenses your HSA would also cover.
What happens to my FSA if I leave my job?▼
You lose access to your FSA when you leave your employer. Any remaining balance is forfeited back to the employer. Some plans offer COBRA continuation, but you pay the full contribution out-of-pocket and only benefit if you'll spend down the balance quickly. This is one of the biggest drawbacks compared to an HSA, which stays with you regardless of employment.
Can I switch from an FSA to an HSA mid-year?▼
Generally no, not mid-year. You need to wait until your employer's next open enrollment period, enroll in an HDHP, and elect HSA contributions instead of FSA. If you have an FSA balance, it must be at $0 or fully spent down before your HSA eligibility begins. The IRS last-month rule adds one nuance: if you become HSA-eligible by December 1, you can contribute the full annual limit for that year, but only if you remain HSA-eligible for the entire following calendar year (the 13-month testing period). Failing the testing period triggers tax plus a 10% penalty on the catch-up portion of the contribution.
Which has higher contribution limits, HSA or FSA?▼
HSAs have significantly higher limits. For 2026, the HSA limit is $4,400 (individual coverage) or $8,750 (family coverage), plus a $1,000 catch-up for those 55+. The FSA limit is $3,300 per employee. HSA limits also increase each year with inflation. Both spouses can contribute to separate HSAs if they each have HDHP coverage, effectively doubling household HSA savings.
Can my spouse have an FSA if I have an HSA?▼
Usually no. If your spouse has a general-purpose FSA through their employer, you are not eligible to contribute to an HSA - even if you have separate health coverage. The IRS treats your spouse's FSA as covering you. The exception: if your spouse's FSA is a Limited-Purpose FSA (dental and vision only) or a Dependent Care FSA, you remain HSA-eligible.
What is a Limited Purpose FSA (LP-FSA)?▼
A Limited Purpose FSA only reimburses dental and vision expenses. It exists specifically to let HSA holders save additional pre-tax dollars without disqualifying their HSA contributions. For families with predictable annual dental work (orthodontia, crowns, implants) or expensive vision care, pairing an LP-FSA with an HSA can save another $720+ per year in taxes versus the HSA alone.
Do FSA contributions reduce my W-2 income?▼
Yes. FSA contributions are taken from your paycheck before federal income tax, Social Security tax, and Medicare tax are calculated. Your reported W-2 wages are reduced by your FSA contribution amount. This makes the FSA more tax-efficient than the HSA above-the-line deduction in one respect: HSA contributions through payroll save FICA tax, but HSA contributions made outside payroll do not.
What happens to my HSA balance if I switch to an FSA?▼
Your HSA balance stays exactly where it is. You own it forever. You stop adding to it once you lose HDHP coverage, but the existing balance keeps earning tax-free growth and can still be withdrawn tax-free for qualified medical expenses at any time. You can also pay for medical expenses incurred during your future FSA period using HSA funds, as long as the expense was incurred after the HSA was opened.
Can I use my HSA to pay for past medical bills?▼
Yes, as long as the expense was incurred after the HSA was opened and you saved the receipt. There is no deadline to reimburse yourself. This is the foundation of the HSA shoebox strategy: pay medical expenses out of pocket for decades, let the HSA grow tax-free invested, then reimburse yourself in retirement using accumulated receipts. The IRS requires only that you keep documentation in case of audit.
Can both spouses contribute to separate HSAs?▼
Yes, if both spouses have HDHP coverage. If both have self-only HDHP coverage, each can contribute up to the individual limit ($4,400 in 2026). If one or both have family HDHP coverage, the family limit ($8,750 in 2026) is split between them in any ratio they choose - but the household total can't exceed $8,750 plus catch-up contributions. The 55+ catch-up of $1,000 is per-person and must go into that person's own HSA.
