A Health Savings Account (HSA) offers a combination of tax benefits that doesn’t exist in any other account type: contributions are pre-tax, growth is tax-free, and qualified withdrawals are tax-free. Most people who have access to an HSA treat it as a pass-through account for immediate medical expenses — which wastes much of its potential.
The Three Tax Advantages Explained
1. Pre-tax contributions. Money you contribute to an HSA reduces your taxable income for the year, similar to a traditional 401(k) or IRA. If you’re in the 24% federal tax bracket and contribute $3,000, you save $720 in federal taxes. Contributions made via payroll deduction also skip Social Security and Medicare taxes, which adds another 7.65% savings.
2. Tax-free growth. HSA funds that you don’t spend immediately can be invested. Many HSA providers offer investment options including mutual funds and ETFs once you meet a minimum balance threshold. Investment gains — dividends, capital gains, price appreciation — accumulate tax-free inside the account.
3. Tax-free withdrawals for qualified medical expenses. When you use HSA funds for qualified health care costs — medical, dental, vision, and many related expenses — there’s no tax owed on the withdrawal. Compare this to a Traditional IRA, where every withdrawal is taxed as income. The HSA beats every other account type for this specific purpose.
Eligibility Requirements
To open and contribute to an HSA, you must be enrolled in a High Deductible Health Plan (HDHP). The IRS defines minimums — the plan must meet minimum deductible thresholds and maximum out-of-pocket limits that adjust annually.
You also cannot be covered by any other non-HDHP health insurance, cannot be enrolled in Medicare, and cannot be claimed as a dependent on someone else’s tax return. If you’re on a parent’s plan as a young adult, check whether it qualifies as an HDHP.
Annual Contribution Limits
The IRS sets annual HSA contribution limits that adjust for inflation. For 2025, the limits are $4,300 for self-only coverage and $8,550 for family coverage, with an additional $1,000 catch-up contribution for those 55 or older. These limits are substantially higher than they were several years ago.
Contributions can come from you (via bank transfer or payroll deduction), your employer, or a combination. Employer contributions count toward your annual limit.
The Investment Strategy Most People Miss
Most HSA holders use the account purely as a spending account — money goes in, medical bills get paid, the account doesn’t grow significantly. This is perfectly valid but leaves substantial tax advantages unused.
An alternative strategy: pay current medical expenses out of pocket (from your regular checking account) instead of drawing from the HSA. Let the HSA balance grow, invested in low-cost index funds. Over years and decades, the invested balance compounds tax-free.
At retirement (age 65), HSA funds can be withdrawn for non-medical expenses with ordinary income tax owed — identical to a Traditional IRA. But for medical expenses in retirement — which tend to be significant — HSA withdrawals remain completely tax-free. Given that retirees spend significant amounts on health care, having a large tax-free source of funds for those expenses is valuable.
The key to this strategy: keep receipts for your current out-of-pocket medical expenses. The IRS doesn’t require you to submit reimbursement requests in the same year the expense occurred. You can reimburse yourself decades later from the HSA — as long as the expense was incurred after the account was established and you have documentation. Some people keep a “medical expense file” of receipts for this purpose.
What Counts as a Qualified Medical Expense
HSA-eligible expenses are broad: doctor’s visits, prescriptions, lab work, dental care, vision care (glasses, contacts, exams), mental health services, medical equipment, and more. The IRS Publication 502 lists eligible expenses. Some items that might surprise you as qualifying: acupuncture, fertility treatments, hearing aids, LASIK eye surgery.
Over-the-counter medications and menstrual care products also became HSA-eligible under the CARES Act. Check current rules as eligible expense categories can expand with legislation.
What to Do If You’re Already Contributing But Not Investing
Log into your HSA account and look for an investment option. Many HSA administrators offer mutual fund investments once you hold a minimum balance (often $500–$1,000). If your current administrator doesn’t offer good investment options or charges high fees, you can roll over your HSA to a different provider with better options — similar to an IRA rollover.
Providers with strong investment options and low fees vary, but several online HSA providers are known for offering low-cost index fund options. Reviewing and potentially moving an underperforming HSA to a better-structured account is worth the time if you intend to use the account as a long-term investment vehicle.
