For savers, choosing how to best allocate money among a stream of account types may seem an impossible task.

There are 401(k) plans, individual retirement accounts, 529 plans, high-yield savings accounts, taxable brokerage accounts, flexible spending accounts, health savings accounts and so on — a veritable hodgepodge of letters, numbers and tax rules.

Each saver is different, meaning the optimal financial answer will vary from person to person.

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But for many people, there seems a clear path: After saving enough money to get your company’s full 401(k) match, save your next dollars in a health savings account if you have access to one, according to financial advisors.

“Imagine a Roth IRA, but extra strength,” said Sabino Vargas, a certified financial planner and senior financial advisor at Vanguard Group.

“People don’t think about the HSA as being so beautiful, but it really is,” said Carolyn McClanahan, a CFP based in Jacksonville, Florida, and a member of CNBC’s Advisor Council.

That beauty is largely due to the outsized tax benefits of HSAs — which are meant for health-care expenses — relative to other accounts.

HSAs offer a unique “triple tax advantage,” said Vargas. Specifically, contributions are tax-free, investment growth is tax-deferred and withdrawals are tax-free if used for eligible medical costs.

That means a saver would generally rarely if ever pay tax on their HSA money, unlike retirement accounts such as a pre-tax or Roth IRA.

Consider this analysis from a new Vanguard report: A $1 investment in a pre-tax or Roth IRA would yield $2.98 after 25 years. The same $1 invested in an HSA would yield $4.29 over that time. (The analysis makes various assumptions about investment returns and tax rates.)

Because health-care costs are “inevitable” in old age, the HSA functions like “an off-label account for retirement preparation,” Vargas said.

HSAs have other advantages, too. For example, savers can invest some or all of their balance. The accounts are also portable, meaning savers can take the money with them if they leave an employer.

Consumers should generally save enough in cash in an HSA to cover their insurance deductible and invest the remainder, as one would with retirement funds. Anyone who can afford to do so should try to pay out of pocket for current health costs and allow HSA investments to grow, advisors say. You can save those receipts and redeem them years down the line (more on that later).

The IRS counts qualified medical expenses as those generally eligible for the medical and dental expenses tax deduction. Those expenses are listed in IRS Publication 502. The list is relatively expansive, advisors said.

If HSA funds are used for non-qualifying health costs, they’d lose one prong of their three-pronged tax benefits: Savers would owe income tax on a withdrawal. However, in this sense they’d still be taxed similarly to a 401(k) or IRA. (Note: HSA users younger than age 65 would owe a 20% tax penalty in addition to income tax.)

To be sure, not everyone has access to an HSA. They are only available to people enrolled in a high-deductible health plan, which have become more prevalent but may not be offered by your employer. A high-deductible plan also may not make financial sense for certain people relative to a traditional co-pay health plan.

A 401(k) can also serve as an emergency fund due to hardship withdrawals allowed by most employers.

The second priority would generally be to max out an HSA, said McClanahan, founder of Life Planning Partners. Individuals can contribute up to $3,850 and families up to $7,750 in 2023.

There are some caveats that might change this HSA calculus. For example, if a saver has credit-card debt, paying that down would take priority over funding an HSA, McClanahan said.

Likewise for someone without an emergency fund: Work on having at least one month of living expenses in savings, then max out your HSA, then prioritize expanding emergency savings to three to six months, McClanahan said.

If there’s money left over, ensuing saving priorities might include IRAs, 529 plans, additional 401(k) savings and taxable accounts, advisors said.