The core strategy: spend less from your HSA than you could, and let the rest grow

A Health Savings Account only saves you money if you use it differently than a regular checking account. The advantage is tax-free growth—money you don't spend this year stays in the account, earns interest or investment returns, and remains available for medical expenses later. Most people waste this by treating their HSA like a debit card for every copay and prescription.

The real move is to pay small medical expenses out of pocket when you can afford it, and leave your HSA balance untouched to grow. At 65, you can withdraw HSA money for any reason without penalty (though non-medical withdrawals are taxed as income). Before 65, you pay income tax plus a 20% penalty on non-medical withdrawals—so the account only works if you're genuinely saving it for future medical costs.

This strategy only works if your plan actually allows it. If you have a high-deductible health plan (HDHP) with a $2,000 deductible, you'll likely hit that deductible most years and have no choice but to spend from your HSA. If your deductible is $5,000 or higher and you're generally healthy, you have real room to let the account grow.

Key Takeaways

  • HSAs grow tax-free only if you don't spend the money—paying routine expenses out of pocket and leaving your HSA balance alone is the core way to build wealth in the account.
  • You can contribute the maximum amount your plan allows each year, and unused contributions roll forward indefinitely with no "use it or lose it" important date.
  • At 65, you can withdraw HSA money for any reason without the 20% penalty, though non-medical withdrawals are taxed as regular income.
  • Keeping receipts for medical expenses you paid out of pocket matters: you can reimburse yourself from your HSA years later, tax-free, as long as you have documentation.
  • Some HSA providers let you invest the balance in mutual funds or stocks, which can grow faster than a savings account but carries market risk.

Contribute the maximum amount allowed, then don't touch it

Your employer or the IRS sets a yearly contribution limit. For 2024, the limit is $4,150 for individual coverage and $8,300 for family coverage (these numbers change annually). If your employer offers an HSA, they usually let you contribute through payroll deductions, which means the money comes out before taxes—you save federal income tax, Social Security tax, and Medicare tax on that amount.

If you're self-employed or your employer doesn't offer an HSA, you can open one through a bank or financial institution and contribute on your own. You'll deduct the contribution on your tax return, which gives you the same tax savings. The key is to contribute as much as you're allowed, because the tax savings are real money.

Once the money is in, the goal is to leave it there. Don't use your HSA debit card for every copay. Don't reimburse yourself when ready for prescriptions. The longer money sits in the account untouched, the more it grows. If you have $5,000 in your HSA at age 35 and never touch it, that money could be worth $15,000 or more by age 65, depending on investment returns.

Pay routine medical costs out of pocket and keep the receipts

This is the part most people skip, and it's where the real tax savings happen. When you have a copay, a dental cleaning, or a prescription, pay for it with your regular debit card or cash. Your HSA balance stays intact and keeps growing.

Save the receipt. You don't have to submit it anywhere or do anything with it right now. Just keep it in a folder or take a photo. Years from now, you can look back at those receipts, add them up, and reimburse yourself from your HSA—tax-free. The IRS allows this as long as the expense was incurred after you opened the HSA and you have documentation.

This matters because it lets you choose when to take the money out. If you're in a high tax bracket one year, you can wait and reimburse yourself in a lower-income year. Or you can straightforward never reimburse yourself and let the HSA grow indefinitely, using it only in retirement or in a year when you have major medical expenses.

Keep receipts for copays, deductibles, coinsurance, prescriptions, dental work, vision care, mental health visits, and medical equipment. Don't keep receipts for health insurance premiums themselves—those aren't HSA-may be able to access expenses (with narrow exceptions for COBRA and long-term care insurance).

Invest the balance if your provider allows it

Many HSA providers let you invest your balance in mutual funds, index funds, or other securities, similar to a 401(k). Some require you to keep a minimum balance in cash (often $1,000 to $2,500) before you can invest the rest. Others let you invest everything when ready.

Investing makes sense if you're young, healthy, and won't need the money for several years. A savings account earns almost nothing—currently around 4% to 5% annually. A diversified stock index fund has historically returned 7% to 10% annually over long periods, though with year-to-year volatility. Over 20 or 30 years, that difference compounds significantly.

The tradeoff is risk. If you invest your HSA and the market drops 20% the year before you need a major surgery, you'll have less money available. If you're likely to need the money within a few years, keep it in a savings account. If you won't touch it for a decade, investing is worth considering.

Check what your HSA provider offers. Some have limited investment options; others offer a full range. If your current provider has poor investment choices, you can roll your HSA to a different provider—this is similar to rolling over a 401(k)—and move to one with better options.

Use your HSA strategically in high-expense years

Some years you'll have major medical costs: surgery, extended physical therapy, orthodontics, or a new prescription regimen. In those years, you'll likely spend down your HSA balance quickly. That's fine—the account is there for that purpose.

The strategy is to use your HSA for these large expenses and let smaller expenses come out of your regular budget. If you're facing a $3,000 surgery and you have $8,000 in your HSA, use the HSA for the surgery and pay your copays and prescriptions out of pocket. This keeps your HSA from being completely depleted and preserves the tax-free growth benefit for future years.

In years with lower medical costs, reverse the approach: pay everything out of pocket and let your HSA grow. Over time, this pattern—spending in high-cost years and saving in low-cost years—maximizes the amount of money that stays in the account long-term.

Plan for HSA withdrawals in retirement

At 65, the rules change. You can withdraw money from your HSA for any reason without the 20% penalty. Non-medical withdrawals are taxed as regular income, but the penalty disappears. This makes your HSA function like a traditional IRA at that point—a tax-deferred retirement account.

Many people use their HSA as a stealth retirement savings account for exactly this reason. They contribute the maximum every year, invest the balance, and never touch it. At 65, they have a large pot of money they can use for retirement expenses, medical or otherwise. The money they spent on medical costs before 65 came out of their regular income, which is fine because those expenses were relatively small.

If you do withdraw for non-medical reasons before 65, keep records of what you withdrew and when. You'll report it on your tax return. If you withdraw for a legitimate medical expense at any age, there's no penalty and no income tax—you just need documentation that the expense was medical.

Frequently Asked Questions

Can I use my HSA for my spouse's medical expenses?

Yes, if you're married and file taxes jointly. You can use your HSA to pay for your spouse's medical costs even if they're not on your health plan. If you're married but file separately, you generally cannot. Check your specific plan documents, as some employers add additional restrictions.

What happens to my HSA if I change jobs or lose my health insurance?

Your HSA stays with you. The account is yours, not your employer's. If you leave your job, you keep the balance and can continue using it for medical expenses. If you lose your HDHP coverage, you can't make new contributions, but you can still withdraw money for medical expenses without penalty. You can also roll the HSA to a new provider if your new employer offers a different HSA.

Can I use my HSA to pay for over-the-counter medications?

As of 2020, yes—you can use your HSA for over-the-counter medications without a prescription. This includes pain relievers, cold medicine, allergy medication, and similar items. You still cannot use it for general health products like vitamins or supplements unless they treat a specific medical condition and you have a doctor's note.

What if I don't spend all my HSA money in a year?

It rolls forward. There's no "use it or lose it" important date with HSAs, unlike Flexible Spending Accounts (FSAs). Money you don't spend stays in the account indefinitely and continues to grow. This is one of the main reasons HSAs are more valuable than FSAs for long-term savings.

Can I withdraw money from my HSA to pay for health insurance premiums?

Only in specific situations. You can use your HSA to pay for COBRA continuation coverage, long-term care insurance, or health insurance while you're receiving unemployment benefits. You cannot use it for regular health insurance premiums, including those from your employer's plan. You also cannot use it for Medicare premiums, with the exception of Medicare Part B, Part D, and supplemental insurance once you're 65.