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The HSA is the only account in the tax code that is untaxed going in, untaxed while it grows, and untaxed coming out. Most of the rules people are confident about are wrong in a way that costs money.
From Rev. Proc. 2026-24, published 29 May 2026:
If your high deductible plan falls outside those bounds, it is not an HSA-qualified plan no matter what the brochure calls it.
"It is use it or lose it." That is an FSA. An HSA is yours permanently. It rolls over every year, it follows you when you change jobs, and it keeps growing. Nobody takes it back.
"After 65 you can take it out tax-free for anything." This one is half right and it is the half that costs money. At 65 the 20% penalty on non-medical withdrawals disappears. Ordinary income tax still applies. IRS Publication 969 says the additional 20% tax does not apply to distributions made after you reach 65, and separately that if you do not use a distribution for qualified medical expenses you must pay tax on it. Nothing in the age-65 exception touches income tax. After 65 an HSA behaves like a traditional 401(k) for non-medical spending, and stays completely tax-free for medical spending.
"Turning 65 ends the account." No. What ends your ability to contribute is enrolling in Medicare, which is a separate event that happens to fall near the same birthday for many people. Enrolled in Medicare, you can still spend the balance tax-free on qualified expenses forever. You just cannot add to it.
"I have to spend it on this year's bills." There is no deadline. Pay a qualified expense out of pocket today, keep the receipt, and reimburse yourself from the HSA in twenty years. The only requirement is that the expense was incurred after the HSA was established. This is the single most valuable and least used feature of the account.
"The employer's contribution is extra." It counts against the same annual cap. If your employer puts in $1,000 on a family plan in 2027, you can add $8,000, not $9,000.
An FSA is not a worse HSA. It is a different thing with one large advantage and one large disadvantage.
The advantage: the full year's election is available to you on day one. Elect $2,000 in January, need it in February, spend $2,000 in February even though you have contributed a couple of hundred. That is real and it matters if you have a known expense coming.
The disadvantage: at year end you forfeit what you have not spent, beyond a carryover your employer may or may not offer. For 2026 the limit is $3,400 with a maximum carryover of $680 (Rev. Proc. 2025-32). The 2027 figures have not been published yet; the IRS normally releases them in October.
You usually cannot have both a general-purpose FSA and an HSA at the same time, and in many households the FSA election is a bet placed in November on how sick you will be the following August.
Money goes in before tax, so a $3,000 contribution at a 22% marginal rate costs about $2,340 of take-home. It grows without tax on the growth. It comes out untaxed for qualified expenses. No other account in the code does all three.
Contributed through payroll it usually escapes payroll tax as well, which the equivalent 401(k) contribution does not.
The catch is that the advantage only exists if you can leave the money alone. An HSA drained every December for co-pays is a modest tax deduction. An HSA invested and left for twenty years is something else entirely. Be honest with yourself about which one you are running.
Rev. Proc. 2026-24 sets fee caps for direct primary care service arrangements at $150 a month for an individual and $300 for a multi-individual arrangement. Inside those caps, the arrangement is not treated as a health plan, which means paying for one no longer disqualifies you from contributing to an HSA. If your employer offers a direct primary care option alongside a high deductible plan, that combination just became workable.
This is education, not tax advice. For a decision with real money attached, talk to someone licensed.