What Is an HSA? A Beginner's Guide for 2026

A Health Savings Account (HSA) is a tax-advantaged savings account that lets you set aside pre-tax money for qualified medical expenses. It's one of the most powerful financial tools available — offering triple tax benefits that no other account type can match.

The Triple Tax Advantage

HSAs are the only account in the U.S. tax code that offers all three tax benefits simultaneously:

Tax-free contributions — Money goes in before taxes, reducing your taxable income

Tax-free growth — Investments and interest grow without being taxed

Tax-free withdrawals — When used for qualified medical expenses, you pay zero tax

No 401(k), IRA, or Roth account offers all three. This is why financial advisors often call the HSA the "stealth retirement account."

HSA Eligibility Requirements

To open and contribute to an HSA in 2026, you must:

Be enrolled in a High-Deductible Health Plan (HDHP)
Minimum deductible: $1,700 (individual) or $3,400 (family)
Maximum out-of-pocket: $8,500 (individual) or $17,000 (family)
Not be enrolled in Medicare
Not be claimed as a dependent on someone else's tax return
Not be covered by a non-HDHP (like a spouse's traditional plan that covers you)

If your employer offers an HDHP option, you probably qualify. Many marketplace (ACA) plans also qualify as HDHPs.

2026 HSA Contribution Limits

	Individual	Family
Contribution limit	$4,400	$8,750
Catch-up (age 55+)	+$1,000	+$1,000

These limits include both your contributions and any employer contributions. You can contribute through payroll deduction (saving FICA taxes too) or make direct contributions (deductible on your tax return).

What Can You Spend HSA Money On?

Always Qualified (No Extra Documentation)

The IRS maintains a broad list of qualified medical expenses:

Doctor visits — copays, deductibles, specialist appointments
Prescriptions — any prescribed medication
Dental — cleanings, fillings, crowns, orthodontics
Vision — exams, glasses, contacts, LASIK
Mental health — therapy sessions with licensed providers
Physical therapy and chiropractic care
Medical equipment — CPAP, hearing aids, blood pressure monitors
Lab tests and imaging
Over-the-counter medications — pain relievers, allergy meds, antacids
Sunscreen and menstrual products

Qualified With a Letter of Medical Necessity (LMN)

Many wellness expenses can become HSA-eligible when prescribed by a licensed provider for a diagnosed condition:

Gym memberships and fitness classes
Fitness equipment (Peloton, treadmill, weights)
Supplements and vitamins
Massage therapy
Ergonomic equipment (standing desks, chairs)
Mental health apps (Headspace, Calm)
Sleep products (weighted blankets, white noise machines)
Health monitoring devices (Whoop, Oura Ring)

The LMN is a letter from your healthcare provider stating the expense is medically necessary for your specific condition. More on this below.

Not Qualified

Cosmetic surgery (unless medically necessary)
General toiletries and hygiene products
Gym memberships without an LMN
Insurance premiums (with limited exceptions)
Vitamins for general health without an LMN

How HSAs Work Day-to-Day

Opening an Account

You can open an HSA through:

Your employer (often the easiest, with payroll deduction)
A bank or credit union (Fidelity, Lively, etc.)
A specialized HSA provider like Hammock (designed for wellness spending)

Contributing

Set up automatic contributions through payroll deduction or bank transfer. You can adjust your contribution amount anytime during the year, as long as you don't exceed the annual limit.

Spending

Most HSAs provide a debit card. Swipe it at the doctor's office, pharmacy, or anywhere you're paying for qualified medical expenses. Keep receipts — your HSA administrator or the IRS may request documentation.

Investing

Once your balance exceeds a threshold (typically $1,000–$2,000), you can invest the excess in mutual funds, ETFs, or other options. This is where the "stealth retirement account" magic happens — your investments grow tax-free.

HSA vs FSA: What's the Difference?

Feature	HSA	FSA
Requires HDHP	Yes	No
Contribution limit (2026)	$4,400 / $8,750	$3,300
Funds expire?	Never	Year-end (with exceptions)
Portability	Yours forever	Tied to employer
Investment options	Yes	No
Employer can contribute	Yes	Yes

The HSA wins on flexibility and long-term value. The FSA wins on accessibility (no HDHP required).

The HSA as a Retirement Tool

Here's a strategy most people miss: you can use your HSA as a long-term investment vehicle.

Pay medical expenses out of pocket during your working years (if you can afford to)

Let your HSA grow tax-free through investments

Reimburse yourself later — HSAs have no deadline for reimbursement. You can pay a medical bill today, invest the HSA funds, and reimburse yourself years (or decades) later

After age 65 — HSA withdrawals for any purpose are penalty-free (you'll pay income tax on non-medical withdrawals, like a traditional IRA)

An HSA contributed to and invested over a career can accumulate hundreds of thousands of dollars — all available tax-free for medical expenses in retirement, when healthcare costs are highest.

Common HSA Mistakes to Avoid

1. Not Contributing the Maximum

If you can afford it, max out your HSA. The tax savings alone make it worthwhile, and the investment growth is a bonus.

2. Only Using It for Small Expenses

Paying for every prescription with your HSA card reduces the long-term growth potential. Consider paying small expenses out of pocket and letting your HSA balance grow.

3. Not Keeping Receipts

The IRS can audit your HSA expenses. Keep receipts and LMNs for every purchase. Digital records are fine.

4. Missing Out on Wellness Expenses

Most people don't realize their gym membership, supplements, or standing desk could be HSA-eligible with an LMN. This is potentially hundreds or thousands of dollars in unused tax savings.

5. Forgetting to Invest

Once your balance passes the minimum threshold, invest the excess. Leaving it in cash means you're missing out on tax-free growth.

FAQ

Can I open an HSA if I'm self-employed?

Yes. As long as you have a qualifying HDHP, you can open an HSA regardless of employment status. Self-employed individuals can deduct HSA contributions on their tax return.

What happens to my HSA if I change jobs?

Your HSA is yours — it's not tied to your employer. You keep it, and you can continue using the funds for qualified medical expenses. If you switch to a non-HDHP, you can't make new contributions, but existing funds remain available.

Can I use my HSA for my spouse or kids?

Yes. HSA funds can cover qualified medical expenses for your spouse and tax dependents, even if they're not on your HDHP.

What's the penalty for non-qualified HSA withdrawals?

If you're under 65, non-qualified withdrawals incur income tax plus a 20% penalty. After 65, the penalty drops to zero — you just pay income tax (like a traditional IRA withdrawal).

What is a Letter of Medical Necessity (LMN)?

An LMN is a document from a licensed healthcare provider stating that a specific expense is medically necessary to treat your diagnosed condition. It's what transforms wellness expenses (gym, supplements, massage) into qualified HSA expenses.

Start Your HSA the Right Way

If you're new to HSAs, choosing the right provider matters. Most traditional HSA providers handle the basics well but leave you on your own when it comes to wellness expenses and LMNs.

Hammock is built differently. Along with a full-featured HSA and debit card, Hammock includes unlimited Letters of Medical Necessity. That means if you have qualifying health conditions — and most Americans do — your gym membership, supplements, massage, and more can all be tax-free from day one. No extra doctor visits. No paperwork headaches. Just a smarter HSA.

Ready to start using your HSA for wellness? Hammock includes unlimited Letters of Medical Necessity — so your gym, supplements, and massage are all tax-free.