What Is a Health Savings Account and How Does It Work?

A health savings account is a federally recognized savings vehicle that allows people enrolled in a high-deductible health plan (HDHP) to set aside money tax-free for medical costs. According to Devenir’s 2024 midyear HSA research report, Americans held more than $137 billion in HSA assets, a figure that has grown steadily for over a decade.

Understanding how an HSA works has become more urgent as employers increasingly shift to high-deductible plans to control costs. This guide explains who qualifies, how contributions and withdrawals work, the tax advantages, and how an HSA compares to similar accounts like an FSA or HRA.

What Exactly Is a Health Savings Account?

A health savings account is a tax-advantaged personal savings account created by the U.S. Congress in 2003 under the Medicare Prescription Drug, Improvement, and Modernization Act. It is designed exclusively for people covered by a qualifying high-deductible health plan. Contributions, earnings, and withdrawals for qualified expenses are all tax-free.

HSAs are owned by the individual, not the employer. The account moves with you when you change jobs, retire, or switch health plans. The IRS governs eligibility rules and contribution limits, while financial institutions like Fidelity, HSA Bank, and HealthEquity serve as account custodians.

A Brief History of HSAs

Before HSAs existed, Flexible Spending Accounts (FSAs) were the primary pre-tax medical savings tool, but they came with strict use-it-or-lose-it rules. Congress created HSAs specifically to give Americans a permanent, portable, and investable alternative. Since their introduction, HSA assets have grown from near zero to over $137 billion as of 2024.

Who Qualifies for a Health Savings Account?

You are eligible to open and contribute to an HSA only if you are enrolled in a qualifying high-deductible health plan (HDHP) and meet four IRS criteria. Meeting all four is required; missing any one disqualifies you from contributing in that period.

The Four IRS Eligibility Requirements

• You are covered by a qualifying HDHP on the first day of the month.
• You have no other health coverage that is not an HDHP (with limited exceptions).
• You are not enrolled in Medicare (Part A or Part B).
• You cannot be claimed as a dependent on another person’s tax return.

Many employer-sponsored plans now qualify as HDHPs, but you should verify with your plan administrator or check the IRS Publication 969 guidelines. Enrollment in Medicaid or most Veterans Affairs (VA) benefits also disqualifies you, with some narrow exceptions.

What Are the HSA Contribution Limits for 2025?

For 2025, the IRS raised HSA contribution limits slightly from 2024 levels to account for inflation. The limits apply to total contributions from all sources, including employer contributions, during the calendar year.

Individuals age 55 or older can make an additional $1,000 catch-up contribution per year. This catch-up provision is permanent and does not adjust for inflation. If both spouses are 55 or older, each must have their own HSA to each contribute the catch-up amount.

Employer Contributions Count Toward the Limit

Many employers contribute to employee HSAs as part of their benefits package. According to the Society for Human Resource Management (SHRM), employer HSA contributions averaged around $600–$900 per year for individual coverage in recent years. Those employer dollars count against your annual IRS cap, so tracking total contributions carefully matters if you want to avoid an excess contribution penalty.

How Does the Triple Tax Advantage Work?

The HSA’s defining feature is its triple tax advantage, a combination no other standard savings or retirement account offers. Each of the three tax benefits compounds the others over time.

Breaking Down All Three Tax Benefits

• Tax-deductible contributions: Money you contribute to an HSA reduces your taxable income dollar-for-dollar. Payroll contributions also avoid FICA taxes (Social Security and Medicare), saving an additional 7.65% on top of income tax savings.
• Tax-free growth: Any interest, dividends, or capital gains earned inside an HSA are not taxed. This mirrors the treatment of a Roth IRA on the growth side.
• Tax-free withdrawals: Withdrawals used for qualified medical expenses are completely tax-free at any age. There is no income threshold or phase-out that limits this benefit.

This structure is why many financial planners refer to the HSA as a “stealth retirement account.” Building this into a broader financial strategy pairs naturally with planning for what retirement actually costs, which you can explore further in our guide on what retirement actually costs.

For those managing debt alongside savings goals, understanding tax-advantaged tools like the HSA can reduce the financial pressure that debt creates. Our article on getting out of debt without burning out offers complementary strategies for building financial stability.

How Does an HSA Compare to an FSA and HRA?

An HSA is one of three main tax-advantaged health accounts. The other two, a Flexible Spending Account (FSA) and a Health Reimbursement Arrangement (HRA), differ in ownership, portability, and contribution rules. Choosing the right account depends on your health plan and financial goals.

Key Differences at a Glance

• HSA: Owned by the individual. Funds roll over indefinitely. Requires HDHP enrollment. Can be invested. Both employee and employer can contribute.
• FSA: Employer-owned. Subject to the use-it-or-lose-it rule (with a grace period or $640 carryover option in 2025). No HDHP requirement for standard FSAs. Cannot be invested.
• HRA: Funded entirely by the employer. The employee contributes nothing. Funds may or may not roll over depending on employer plan design. Covered by ERISA in most cases.

The 2025 FSA contribution limit is $3,300 per employee, as set by the IRS in Revenue Procedure 2024-40. That limit is lower than the HSA family cap and comes with far less flexibility for long-term savers.

Can You Invest Your HSA for Long-Term Growth?

Yes. Most HSA custodians allow account holders to invest their balance in mutual funds, ETFs, and other securities once the balance exceeds a minimum threshold, typically $1,000 to $2,000. Investing transforms an HSA from a simple spending account into a powerful long-term wealth-building tool.

How to Invest HSA Funds

Providers like Fidelity, Lively, and HealthEquity offer brokerage-style investment options within their HSA platforms. Fidelity, in particular, allows investing with no minimum balance and no account fees, making it one of the most competitive options for HSA investors in 2025.

A common strategy among long-term planners is to pay current medical expenses out-of-pocket, if affordable, and save all HSA receipts. Because the IRS imposes no time limit on reimbursing qualified expenses, you can withdraw stored-up, tax-free reimbursements years later. This approach effectively turns the HSA into an additional tax-free investment account.

That investment-first mindset fits well within a broader personal financial system. Our guide to building a personal financial system explains how to integrate accounts like HSAs into a cohesive long-term strategy.

What Counts as a Qualified Medical Expense?

A qualified medical expense is any cost defined under IRS Section 213(d) as a legitimate medical, dental, or vision expense. Withdrawals for these purposes are 100% tax-free at any age. Non-qualified withdrawals before age 65 are taxed as income and subject to a 20% penalty.

Common Qualified Expenses

• Doctor visits, surgeries, and specialist copays
• Prescription medications
• Dental treatments (fillings, extractions, braces)
• Vision care (glasses, contact lenses, LASIK surgery)
• Mental health therapy and substance use treatment
• Medical equipment (wheelchairs, hearing aids, blood pressure monitors)
• Medicare premiums (Parts A, B, C, and D) after age 65
• Long-term care insurance premiums (up to IRS age-based limits)

The CARES Act of 2020 permanently expanded qualified expenses to include over-the-counter medications and menstrual care products without a prescription. A full list is published by the IRS in Publication 502. One notable exclusion: standard health insurance premiums are generally not qualified expenses unless you are on COBRA, receiving unemployment benefits, or enrolled in Medicare.

Pairing an HSA strategy with retirement planning is especially powerful. If you are working through a retirement plan and feeling behind, our article on retirement planning for people who feel late addresses how to accelerate savings using every available tax advantage.

Most people treat their HSA like a debit card for copays. The stronger approach is to treat it like a second Roth IRA: invest the balance, leave it alone, and let compounding work over decades. Tax-free medical withdrawals in retirement represent a significant advantage that most account holders underuse, according to Fidelity’s research on HSA investing behavior.

Frequently Asked Questions

Can I use my HSA to pay for a family member’s medical expenses?

Yes. HSA funds can be used tax-free for qualified medical expenses incurred by the account holder, their spouse, and any dependents claimed on their federal tax return. This applies even if your family members are not covered by your HDHP.

What happens to my HSA if I switch to a non-HDHP health plan?

Your existing HSA balance remains yours and continues to grow tax-free. You simply cannot make new contributions while you are not enrolled in a qualifying HDHP. You can still use the existing funds for qualified medical expenses at any time.

Is there a deadline for contributing to an HSA for a given tax year?

Yes. You can contribute to your HSA for a given tax year up until the federal tax filing deadline, typically April 15 of the following year. This mirrors the contribution deadline for IRAs and gives you extra time to maximize your tax deduction.

Can I have an HSA and a 401(k) at the same time?

Absolutely. An HSA and a 401(k) are completely separate accounts governed by different IRS rules. Many financial advisors recommend maxing out the HSA before directing additional savings to a 401(k) beyond the employer match, because of the HSA’s superior tax treatment. To understand how those retirement decisions interact, see our breakdown of Roth vs. Traditional 401(k) options.

What is the penalty for non-qualified HSA withdrawals?

Withdrawals used for non-qualified expenses before age 65 are subject to ordinary income tax plus a 20% penalty. After age 65, the 20% penalty disappears and you pay only ordinary income tax, just as you would on a Traditional IRA distribution.

Can a self-employed person open an HSA?

Yes. Self-employed individuals can open and contribute to an HSA as long as they are enrolled in a qualifying HDHP. Contributions are deductible on Schedule 1 of Form 1040 and reduce adjusted gross income, even if you do not itemize deductions.

Does investing HSA funds affect my ability to use the money?

No. Invested HSA funds can be liquidated at any time to pay for qualified medical expenses. Most custodians process sell orders within one to three business days. Maintaining a small cash buffer within the HSA, enough to cover near-term medical costs, is a practical way to stay invested while keeping funds accessible.