A high-income individual in their 50s who consistently maxes out a 401(k) may still be overlooking one of the most tax-advantaged accounts available. For those who qualify, a Health Savings Account (HSA) stands out as the only account in the U.S. tax system that offers three distinct tax benefits—yet many people either underfund it or ignore it altogether.
Three Tax Breaks, One Account
HSA contributions are deducted directly from your paycheck before federal income tax, most state income taxes, and FICA taxes are applied. While a 401(k) allows you to avoid federal and state taxes, it does not exempt FICA taxes. The HSA does, which can make a noticeable difference for high earners subject to the 7.65% FICA rate.
Funds inside the account grow on a tax-deferred basis. When invested in index funds, any dividends, capital gains, or appreciation accumulate without being reduced by taxes. Withdrawals used for qualified medical expenses are entirely tax-free, with no income limits, no phase-outs, and no age-based restrictions.
This makes the HSA unique—it is tax-free when you contribute, tax-free while it grows, and tax-free when used for eligible expenses. By comparison, a Roth IRA only provides tax-free growth and withdrawals, while a traditional 401(k) offers tax savings on contributions and deferred growth.
What You Need to Qualify and Contribute
To open and contribute to an HSA, you must be enrolled in a qualifying high-deductible health plan (HDHP). For 2026, this means a minimum deductible of $1,700 for individual coverage or $3,400 for family coverage. Out-of-pocket maximums must not exceed $8,300 for individuals or $16,600 for families. Many employer-sponsored plans already meet these requirements.
Contribution limits for 2026 are set at $4,400 for individuals and $8,750 for families. Individuals aged 55 and older can contribute an additional $1,000 as a catch-up, bringing the personal limit to $5,400. Married couples over 55, each with their own HSA, can collectively contribute up to $9,750 in a single year.
Why High Earners Should Fund This Before Finishing the 401(k)
Withdrawals from a traditional 401(k) in retirement are treated as ordinary income. This can increase the portion of Social Security benefits that becomes taxable and may also trigger higher Medicare premiums through IRMAA surcharges.
HSA withdrawals for qualified medical expenses, however, are not counted as income. This means they do not impact IRS calculations tied to Social Security taxation or Medicare premium adjustments.
According to Fidelity Investments, a 65-year-old retiring today could face approximately $172,500 in healthcare costs during retirement, with couples facing even higher expenses.
Covering these costs with HSA funds instead of 401(k) withdrawals helps reduce taxable income and lowers the risk of crossing IRMAA thresholds, which can increase Medicare premiums by $70 to $400 or more per month per person.
The Receipt Strategy That Turns the HSA Into a Tax-Free Cash Reserve
One of the most powerful features of an HSA is the flexibility around reimbursements. There is no requirement to reimburse yourself for medical expenses in the same year they occur. You can pay out of pocket now, save the receipts, and allow your HSA investments to grow over time.
Later, you can withdraw funds tax-free to reimburse yourself for those past expenses. The IRS does not impose a deadline for reimbursement, only that the expense occurred after the HSA was established.
For example, a 55-year-old contributing $5,400 annually and investing those funds without withdrawals for ten years can build a sizable balance. That amount can later be accessed completely tax-free by using saved medical receipts. In contrast, funds in a taxable brokerage account would incur taxes on dividends and capital gains each year.
What Happens After 65?
Once you enroll in Medicare, you are no longer eligible to contribute to an HSA. However, the existing balance remains yours and continues to benefit from its triple tax advantages when used for qualified medical expenses.
After age 65, the HSA also functions similarly to a traditional IRA for non-medical withdrawals. These withdrawals are taxed as ordinary income but are no longer subject to penalties. Before age 65, non-qualified withdrawals are taxed and also incur a 20% penalty.
Additionally, Medicare premiums become eligible expenses after age 65. HSA funds can be used tax-free to pay for Medicare Part B, Part D, and Medicare Advantage premiums. However, Medigap premiums are not considered qualified expenses.
For retirees managing income thresholds tied to IRMAA, using HSA funds to cover Medicare premiums instead of withdrawing from a 401(k) can help reduce taxable income and avoid higher premium tiers.