Updated August 3, 2026. Quick answer: an HSA left in cash earns almost nothing while inflation erodes it. Investing it is what makes the receipt strategy worth doing at all — but keep enough in cash to cover the deductible you might actually face this year.
The two-bucket approach
Cash bucket: roughly what you could be asked to pay out of pocket in a bad year. That is the plan deductible, or the out-of-pocket maximum if you want to be thorough. This is not an investment decision; it is what stops you selling at a bad moment.
Invested bucket: everything above it, treated as a long-horizon account, because that is what it is. If you are paying medical costs from other money and reimbursing decades later, the horizon is genuinely decades.
What to check about your specific account
- The cash threshold before investing is allowed. Many custodians require a minimum balance in cash first, and some are high enough to make investing impractical on a small balance.
- The fees — a monthly account fee, an investment-platform fee, and fund expenses are often three separate charges.
- Whether the employer subsidises the fee, and what happens when you leave. You can transfer it, without limit, and fees are the usual reason to.
What we are not going to tell you
What to invest in, or what it will return. We are not making a return promise and no page should. The structural point is the whole argument: an account that is untaxed on growth is the worst possible place to hold cash earning nothing, and the best place to hold the long-horizon money you genuinely will not touch.
And the risk is real in both directions. An invested HSA can fall, and it can fall in the year you need it — which is exactly what the cash bucket is for.
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Related: the receipt strategy · funding order.
General information drawn from the Internal Revenue Code, IRS publications and IRS notices, not legal, tax or financial advice. HSA contribution limits and catch-up amounts are adjusted annually and are deliberately not reproduced here – use the current IRS figures. Eligibility depends on your health plan and your Medicare status, both of which change. We sell no accounts and receive nothing from any HSA provider.