HSA investing strategy: your HSA as a retirement account

A health savings account is the only account where money goes in tax-deductible, grows untaxed and comes out tax-free for medical costs. For 2026 you can contribute $4,400 with self-only coverage or $8,750 with family coverage, plus $1,000 if you’re 55 or older, as long as you’re on an HSA-eligible health plan and not on Medicare. The strategy that gets the most from it is simple: invest the balance, pay current medical bills from other money if you can, keep the receipts, and let the account grow for retirement healthcare. A family contributing $8,750 a year for 20 years ends with about $289,000 at 5% growth, against about $193,000 left in cash earning 1%.

For the definition, see the glossary entry on the HSA. This guide covers how to use one as a long-term account and the rules that trip people up.

The 2026 rules

Employer contributions count toward the limit. For 2026 you can contribute until April 15, 2027.

New this year. From January 1, 2026, bronze and catastrophic plans count as HSA-compatible, and IRS guidance says they don’t have to be bought through an exchange. You can also have a direct primary care arrangement costing up to $150 a month ($300 for more than one person) and still contribute, and pay those fees from the HSA. Telehealth before the deductible no longer costs you eligibility. If you’re choosing a plan during open enrollment, these widen the options.

How the investing strategy works

The figures hold the limit at its 2026 level; the real limit rises with inflation. The approach:

1. Contribute the maximum, ideally through payroll if your employer offers it.
2. Keep a cash buffer equal to your deductible, either in the HSA or in savings.
3. Invest the rest in low-cost, diversified funds. Many providers hold your money in cash until you choose otherwise.
4. Pay medical bills from other money when you can, and save the receipts. You can reimburse yourself tax-free later for any qualified expense incurred after the HSA was opened. The IRS doesn’t require you to withdraw in the same year.
5. After 65, use it for Medicare premiums other than Medigap, long-term care insurance within limits, and out-of-pocket costs. Non-medical withdrawals are then taxed like a traditional IRA, without the extra 20%.

Common mistakes

1. Leaving it all in cash. The default is often a low-interest account. Decades of untaxed growth are the point.
2. Contributing after Medicare starts. Your limit drops to zero the first month you’re enrolled. If you sign up after 65, Part A is backdated up to six months, and contributions in those months become excess contributions. Stop contributing six months before you apply.
3. Going over the limit with employer money. Your employer’s deposits and yours share one limit.
4. Losing the receipts. Without records, you can’t show a later withdrawal was for a qualified expense.
5. Using the last-month rule and then leaving the plan. If you become eligible in December and contribute a full year’s amount, you must stay eligible through the following year, or part of it is taxed with a 10% additional tax.
6. Naming the wrong beneficiary. A spouse inherits it as their own HSA. Anyone else owes income tax on the whole balance in the year of death, which is a reason to name a spouse, or to spend the HSA down first in retirement.
7. Ignoring state tax. State treatment of HSAs can differ from the federal rules, so check yours.

One more tool: once in your life, you can move IRA money directly into an HSA, up to that year’s contribution limit, with no tax. It counts against the year’s limit and comes with its own testing period.

Questions to ask an advisor

1. Given my health costs and my employer’s contribution, is the HSA-eligible plan actually cheaper for me than the alternative?
2. Which HSA provider and funds should I use, and should I move my balance away from my employer’s provider?
3. How much cash should stay in the account?
4. When should I stop contributing before Medicare, and how does the HSA fit with my Roth conversions and withdrawal order?
5. Who should be the beneficiary, and should I spend this account first or last?

When a fee-only advisor is worth it, and what it costs

An HSA on its own rarely justifies paying an advisor: pick low-cost funds and keep receipts. It’s worth bringing to a planner as part of bigger questions, such as choosing health plans and benefits each open enrollment, deciding how much to save across a 401(k), IRA and HSA, or planning healthcare between retiring and Medicare. See financial advisor for retirement for the Medicare premium rules that interact with HSA withdrawals.

Among fee-only firms that publish prices, hourly advice has a median of $300 an hour (middle half $250 to $350), a one-time plan is $2,000, and ongoing planning $4,500 a year. A benefits and savings review is a good fit for an hourly or one-time engagement. If an advisor manages your HSA’s investments, ask whether its balance is included in what they bill on.

To find advisors who work on this, browse advisors for early-career professionals and advisors for pre-retirees, the retirement planning specialty, or the early-career professionals and pre-retirees pages. The year-end tax planning checklist lists the HSA deadline alongside the others.