What These Accounts Have in Common
FSAs, HRAs, and HSAs are all tax-advantaged accounts designed to help you pay for healthcare and certain wellness expenses. Despite the similar framing, they operate under fundamentally different rules — who funds them, who owns them, when the money expires, and what you can use them for all differ significantly across the three types.
The one thing they genuinely share: money used for eligible expenses comes out tax-free, which makes them meaningfully more valuable than simply using after-tax income to pay the same bills.
FSA: Flexible Spending Account
A Flexible Spending Account is an employer-offered benefit that lets you set aside a portion of your paycheck before taxes are calculated, into an account you can use to pay for eligible healthcare expenses. Because the contribution comes out before federal income tax, Social Security tax, and Medicare tax are applied, every dollar you contribute effectively costs you less than a dollar in take-home pay.
How FSAs Work
During open enrollment, you elect how much to contribute to your FSA for the coming year. That annual amount is divided across your pay periods and withheld from each paycheck. Critically, the full annual election amount is available to you on the first day of the plan year — even though the money hasn't been fully withheld yet. This is a meaningful benefit that most people don't realize: you can have a $1,500 medical expense in January and use your FSA to pay it in full, even if only $125 has been withheld from your first paycheck.
The IRS requires that the full FSA election amount be accessible from day one of the plan year. This means if you elect $1,800 for the year, all $1,800 is available January 1st even though you'll contribute $150/month over 12 months. This is a structural feature of FSAs — not a perk offered by your employer. If you leave your job mid-year having used more than you contributed, you generally don't owe the balance back.
The Use-It-Or-Lose-It Rule
The most important FSA rule to understand: money not used by the end of the plan year is forfeited. This is the defining characteristic that separates FSAs from HSAs. Employers can offer one of two small relief provisions, but are not required to:
- Grace period: Up to 2.5 additional months after the plan year ends to spend remaining funds.
- Rollover: A limited carryover amount (set by the IRS, adjusted periodically) that can roll to the following year. Employers can offer this or the grace period, but not both.
If your employer offers neither provision, unspent FSA funds are forfeited at year end — they go back to the employer, not to you.
It's better to slightly under-contribute to your FSA and leave a small tax benefit on the table than to over-contribute and forfeit money. Estimate your expected medical expenses for the year as accurately as you can, and if you're uncertain, err toward a lower election. You can use any remaining balance before year-end on eligible items you'd purchase anyway — like prescription glasses, contact lenses, or a year's worth of over-the-counter medications.
Dependent Care FSA: A Separate Animal
A Dependent Care FSA (DCFSA) is a separate type of FSA for child and adult dependent care expenses — daycare, after-school programs, elder care — not healthcare. The same pre-tax contribution and use-it-or-lose-it rules apply, but eligible expenses are entirely different. If your employer offers both, they are separate elections with separate balances.
HRA: Health Reimbursement Arrangement
An HRA is fundamentally different from an FSA or HSA in one critical way: you never contribute to it. HRAs are funded entirely by your employer. You incur eligible healthcare expenses, submit documentation for reimbursement, and your employer reimburses you from the HRA balance they've set aside.
An employer-funded benefit account used to reimburse employees for eligible healthcare expenses. Unlike FSAs and HSAs, you make no contributions. The employer decides how much to fund, what expenses are eligible, and whether unused balances roll over year to year. Because the employer owns the funds, you typically forfeit any unused balance if you leave the company.
Types of HRAs
HRAs come in several variations, and your employer chooses which type to offer:
- Standard HRA: Paired with traditional employer health coverage. Reimburses out-of-pocket costs like deductibles and copays. Most common in larger companies.
- Individual Coverage HRA (ICHRA): Allows employers to reimburse employees for individual health insurance premiums — including marketplace plans — rather than offering group coverage. Available to employers of any size since 2020.
- Qualified Small Employer HRA (QSEHRA): Available to employers with fewer than 50 full-time employees who don't offer group coverage. Reimburses premiums and medical expenses up to a cap set annually by the IRS.
- Lifestyle Spending Account (LSA): A newer, informal cousin to the HRA — employer-funded accounts that reimburse a broader range of wellness expenses (gym memberships, mental wellness apps, ergonomic equipment). LSAs are not tax-advantaged like formal HRAs; reimbursements are typically treated as taxable income.
Unlike FSAs, HRAs don't have a federal use-it-or-lose-it mandate. Your employer decides whether unused HRA balances roll over year to year. Some employers allow full rollover; others reset balances annually. Check your Summary Plan Description — or simply ask your HR department — for your specific plan's rules before assuming the money carries forward.
HSA: Health Savings Account
The HSA is the most powerful of the three account types, and the most restrictive to access. It's only available to people enrolled in a High-Deductible Health Plan (HDHP) — a health plan that meets specific IRS criteria for minimum deductible amounts and maximum out-of-pocket limits. If your health plan isn't an HDHP, you cannot contribute to an HSA.
What Makes the HSA Unique
The HSA has three tax advantages stacked together — a combination no other account in the U.S. tax code offers:
- Contributions are pre-tax (or tax-deductible if made outside payroll), reducing your taxable income in the year you contribute.
- Growth is tax-free. HSA funds can be invested in mutual funds or other investment options offered by your HSA provider. Earnings, dividends, and capital gains accumulate tax-free.
- Withdrawals for eligible expenses are tax-free, at any age, for any qualifying medical, dental, or vision expense.
No other personal finance account combines tax-deductible contributions, tax-free growth, and tax-free withdrawals. A 401(k) gives you the first and second. A Roth IRA gives you the second and third. The HSA gives you all three — but only for qualifying medical expenses. For people who are generally healthy and enrolled in an HDHP, this makes the HSA the highest-priority savings vehicle in their financial toolkit after capturing any employer 401(k) match.
The Rollover Advantage
Unlike FSAs, HSA funds never expire. Every dollar you contribute rolls over indefinitely — year to year, job to job, state to state. The HSA belongs to you personally, not to your employer. When you leave a job, your HSA goes with you. You can change HSA providers. You can invest the balance. You can let it grow for decades.
After Age 65
Once you turn 65, HSA funds can be withdrawn for any purpose — not just medical expenses — without penalty. Non-medical withdrawals are taxed as ordinary income, just like a traditional IRA distribution. For medical expenses, withdrawals remain completely tax-free at any age. This effectively makes a well-funded HSA a secondary retirement account that happens to also cover medical costs tax-free.
Once you enroll in Medicare (typically at 65), you can no longer make new contributions to an HSA. This is because Medicare is not a High-Deductible Health Plan. If you plan to work past 65 and delay Medicare enrollment, you can continue contributing. But the moment your Medicare coverage begins, contributions must stop. You can still use existing HSA funds — including for Medicare premiums — but the accumulation phase ends.
Side-by-Side Comparison
What Expenses Are Actually Eligible
All three account types generally follow IRS Publication 502 as the baseline for eligible medical expenses. The list is broader than most people expect:
Commonly Eligible (All Three Accounts)
- Deductibles, copays, and coinsurance payments to your health plan
- Prescription medications
- Dental care — cleanings, fillings, extractions, orthodontia
- Vision care — exams, prescription eyeglasses, contact lenses and supplies
- Mental health services — therapy, psychiatry, inpatient mental health treatment
- Chiropractic care
- Acupuncture
- Hearing aids and batteries
- Medical equipment — crutches, blood pressure monitors, blood glucose monitors
- Over-the-counter medications — cold medicine, pain relievers, antacids (no prescription required since 2020)
- Feminine hygiene products (added as eligible in 2020)
- Menstrual care products
Common Expenses That Are NOT Eligible
- Health insurance premiums (exception: HSAs can pay certain premiums, including Medicare premiums, after age 65)
- Cosmetic procedures with no medical necessity
- Gym memberships (unless prescribed for a specific medical condition — a very narrow exception)
- Vitamins and supplements (unless prescribed for a diagnosed deficiency)
- Teeth whitening
- Toothbrushes and toothpaste
The IRS requires documentation for FSA, HRA, and HSA expenses. Your account administrator may ask for receipts at any time, and HSA holders are responsible for substantiating withdrawals if audited — sometimes years later. Keep receipts digitally (a photo in a dedicated folder works fine) for any expense paid from one of these accounts. Many HSA providers offer receipt-storage features directly in their apps.
Using Your HSA as a Long-Term Savings Tool
The most underutilized strategy for HSA holders is treating the account as a long-term investment vehicle rather than a current-year spending account — a strategy sometimes called the "HSA investment ladder."
The key insight: there is no IRS deadline on when you must reimburse yourself from an HSA for an eligible expense. You can pay a medical bill out of pocket today, keep the receipt, and reimburse yourself from your HSA three, seven, or twenty years later — after the invested funds have had time to grow. The withdrawal is still tax-free as long as you have the documentation.
The deferred reimbursement strategy works only if you meticulously save receipts for every eligible expense and have the cash flow to pay medical bills out of pocket in the short term. It is not appropriate for everyone. If you need the HSA funds to cover current medical expenses, use them — that's exactly what they're for. The investment strategy is an optimization layer for people who have cash flow flexibility.
Which Account Is Right for Your Situation
In most cases, you don't choose between these accounts — your employer chooses what to offer, and you work with what's available. But understanding the differences helps you make the most of what you have:
- If your employer offers an FSA: Contribute enough to cover predictable annual medical expenses — prescriptions, known dental work, regular vision care — and err toward under-contributing to avoid forfeiture. Use the full balance before year-end.
- If your employer offers an HRA: Understand the reimbursement process and eligible expenses before you incur costs. Submit receipts promptly. Clarify rollover rules with HR.
- If you're on an HDHP and offered an HSA: Prioritize HSA contributions — especially up to any employer match — before considering other savings vehicles. If you have the cash flow, invest the balance and pay current expenses out of pocket. The compounding tax advantage over time is significant.
- If you have access to both an FSA and an HSA: You generally cannot have both a standard healthcare FSA and an HSA simultaneously. However, a Limited Purpose FSA (covering only dental and vision) can be paired with an HSA. If your employer offers this combination, it's worth using — reserve HSA funds for medical expenses and use the LP-FSA for dental and vision.
FSAs, HRAs, and HSAs all reduce your tax burden on healthcare spending, but they operate under completely different rules. The FSA is a use-it-or-lose-it annual benefit best used for predictable expenses. The HRA is free employer money — understand the rules and use it. The HSA is the most powerful of the three: it's portable, it rolls over forever, it can be invested, and it has a triple tax advantage that makes it one of the best savings vehicles in the entire U.S. tax code — as long as you're enrolled in a qualifying high-deductible plan.