Paired with high-deductible healthcare plans, health savings accounts help ease healthcare costs. HSAs are a triple tax-advantaged vehicle in the tax code, allowing for pretax contributions, tax-free compounding, and tax-free withdrawals for qualified medical expenses. However, few owners fund their HSAs to the maximum, and even fewer invest their HSA dollars outside a savings account.

Most consumers likely don’t fill their HSAs because they lack the financial means; critics note that the HDHP/HSA combination can be less beneficial for lower-income workers. But even wealthy consumers may decline to fully fund their HSAs. Many HSAs charge account-maintenance fees and extra costs for investing in long-term assets.

Unlike 401(k)s, where participants are typically captive in employer plans,

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