How to Use a Health Savings Account to Reduce Your Medical Costs

Fact-checked by the Smart Insurance 101 editorial team

A health savings account HSA is a tax-advantaged account available exclusively to people enrolled in a High-Deductible Health Plan (HDHP). According to IRS Publication 969, contributions reduce your taxable income dollar-for-dollar, making an HSA one of the most efficient tools for cutting medical costs. Understanding how your health insurance deductible and out-of-pocket maximum interact with your HSA is essential for maximizing savings.

With medical coverage shrinking as costs rise nationwide, knowing how to use an HSA strategically has never been more important.

Who Is Eligible for a Health Savings Account HSA?

You must be enrolled in an IRS-qualified High-Deductible Health Plan to open and contribute to a health savings account HSA. For 2025, the IRS defines an HDHP as a plan with a minimum deductible of $1,650 for self-only coverage or $3,300 for family coverage, according to IRS Rev. Proc. 2024-25.

You cannot be enrolled in Medicare, claimed as a dependent on someone else’s tax return, or covered by a non-HDHP health plan simultaneously. Flexible Spending Accounts (FSAs) can disqualify you unless they are specifically structured as “limited-purpose” FSAs.

HDHP vs. Traditional Plans

Choosing between an HDHP and a traditional plan depends on your expected medical usage. If you are generally healthy and rarely hit your deductible, an HDHP paired with an HSA often costs less overall than a low-deductible plan with higher premiums. Review our guide on HMO vs PPO health insurance plans to see how plan types compare before selecting an HDHP.

What Are the HSA Contribution Limits for 2025?

The IRS sets annual HSA contribution limits each year. For 2025, the limits are $4,300 for self-only coverage and $8,550 for family coverage, both increased from 2024 levels. Account holders aged 55 or older can make an additional $1,000 catch-up contribution, per official IRS guidance.

Contributions can come from you, your employer, or a family member. However, the total from all sources combined cannot exceed the annual limit. Employer contributions count toward your cap — not in addition to it.

You have until the federal tax filing deadline — typically April 15 of the following year — to make contributions that count for the prior tax year. This gives you flexibility to maximize savings even after the calendar year ends.

How Does the HSA Triple Tax Advantage Work?

The health savings account HSA is uniquely powerful because it offers three separate tax benefits that no other account type matches. Contributions are tax-deductible, growth is tax-free, and withdrawals for qualified medical expenses are also tax-free — a combination the IRS explicitly permits under Section 223 of the Internal Revenue Code.

Contribution Deduction

Contributions made directly to your HSA are deductible on your federal income tax return, even if you do not itemize. If your employer deducts contributions pre-tax from your paycheck, you also avoid FICA taxes (Social Security and Medicare), saving an additional 7.65% compared to contributing after-tax.

Investment Growth

Many HSA providers — including Fidelity, Lively, and HSA Bank — allow you to invest your balance in mutual funds, ETFs, and other securities once it exceeds a threshold. According to Devenir’s 2024 HSA Research Report, total HSA assets reached $123 billion across more than 36 million accounts, reflecting growing use as a long-term investment vehicle.

What Medical Expenses Can You Pay With an HSA?

Qualified medical expenses for HSA purposes are defined by IRS Publication 502 and include a broad range of costs beyond hospital visits. You can use HSA funds tax-free for doctor visits, prescriptions, dental care, vision care, mental health services, and many over-the-counter medications.

The CARES Act of 2020 permanently expanded eligibility to include over-the-counter drugs without a prescription and menstrual care products. Telehealth services also qualify, which has expanded practical usability significantly.

What Does Not Qualify

Non-qualified expenses include cosmetic surgery, gym memberships (in most cases), and general health supplements. Withdrawals for non-qualified expenses before age 65 are subject to income tax plus a 20% penalty. After age 65, the penalty disappears — making an HSA function similarly to a traditional IRA for non-medical spending.

If you are self-employed and managing your own health plan, the combination of an HDHP and HSA is especially strategic. See our breakdown of the best health insurance plans for self-employed workers in 2026 for pairing recommendations.

How Can You Use an HSA to Build Long-Term Medical Savings?

The most powerful HSA strategy is to pay current medical expenses out-of-pocket — if your budget allows — and let your HSA balance grow invested for future use. There is no deadline to reimburse yourself, meaning you can accumulate receipts for years and withdraw a lump sum later, completely tax-free.

According to Fidelity’s 2024 Retiree Health Care Cost Estimate, the average couple retiring at age 65 will need approximately $330,000 to cover healthcare costs in retirement. An HSA that is funded and invested consistently over a career can offset a significant portion of that burden.

Unlike Flexible Spending Accounts (FSAs), HSAs have no “use-it-or-lose-it” rule. Balances roll over indefinitely, and the account follows you when you change employers. This portability makes the health savings account HSA a cornerstone of any long-term financial plan. Understanding the full picture of medical insurance costs and structures helps you determine how much to allocate annually.

Frequently Asked Questions

Can I use my HSA to pay for health insurance premiums?

Generally, no. HSA funds cannot be used tax-free to pay standard health insurance premiums. Exceptions include COBRA continuation coverage premiums, qualified long-term care insurance, and Medicare premiums once you are enrolled — all permitted under IRS rules.

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

Your existing HSA balance remains yours and can still be used for qualified medical expenses tax-free. However, you cannot make new contributions to a health savings account HSA while covered by a non-HDHP plan. The account simply becomes a spending account rather than a contribution account.

Can my employer contribute to my HSA?

Yes. Employer contributions to your HSA are excluded from your gross income and do not count as wages. The combined total of your contributions and employer contributions still cannot exceed the IRS annual limit — $4,300 for self-only or $8,550 for family coverage in 2025.

Is an HSA worth it if I have high medical expenses?

It depends on your HDHP’s deductible relative to your expected costs. If your annual medical bills regularly exceed your deductible, the higher out-of-pocket exposure of an HDHP may outweigh the tax savings. Use a benefits calculator to compare total annual costs across plan types before enrolling.

Can I invest my HSA in stocks or mutual funds?

Yes, most major HSA custodians — including Fidelity, Lively, and HSA Bank — allow investment in stocks, mutual funds, and ETFs. Some require a minimum cash balance before investing. Investment gains within the HSA are never taxed as long as funds are eventually used for qualified medical expenses.

Does an HSA affect my eligibility for other tax benefits?

HSA contributions reduce your adjusted gross income (AGI), which can improve eligibility for other income-based tax benefits. However, if your employer contributes pre-tax through payroll, those amounts are already excluded from your W-2 wages and cannot be deducted again on your return.