What is a 401(h) plan?

It's an account, not a plan

A 401(h) is an account — a separate pool of funds that lives inside a company pension plan. It can't exist on its own. There's no such thing as walking into a bank and opening a 401(h) the way you might open a savings account. It only comes into being when it's attached to a pension that's already up and running.

A simple way to picture it: think of a company's pension plan as a house. The house has a main purpose — to provide retirement income for the people who work there. A 401(h) account is like a dedicated room added onto that house for one specific use. The room isn't a separate building. It shares the same foundation, the same address, the same roof. But inside that room, something particular happens that doesn't happen anywhere else in the house.

That "something particular" is the whole reason the account exists — which we'll get to next. For now, the key idea is simply this: the plan is the house, and the 401(h) is a room inside it. You can't have the room without the house.

This is also why you'll sometimes hear it described as a plan "feature" or a plan "provision" rather than a plan itself. All of those descriptions point at the same truth — it's a part of something larger, never the whole thing.

What kind of "house" can it attach to?

Not every retirement plan can hold a 401(h) account. It has to attach to a particular kind of plan — a pension.

A pension is a retirement plan built around the idea of providing steady, promised retirement benefits, and it's funded mainly by the employer rather than by employees setting aside their own paychecks. The traditional company pension is the classic example, and a newer, increasingly popular cousin called a cash balance plan fits the bill too.

Why does the type matter so much? Because the rules only allow this particular kind of medical account to ride along with a pension. A plain 401(k) — the kind where employees contribute from each paycheck — generally can't hold one. So in practice, a 401(h) account shows up in the world of business owners and professional practices, where pensions and cash balance plans are already part of the picture.

If a business owner wants the account but doesn't have a pension yet, the usual path is to set up the pension first — the house — and then add the 401(h) room to it.

What the account actually does

Here's the part that makes people sit up: a 401(h) account is designed to pay for medical costs in retirement.

That's its one job. While the main retirement plan handles the paycheck-in-retirement side of things, the 401(h) account sits alongside it, earmarked specifically to help cover healthcare expenses once a person has stopped working. Doctor visits, prescriptions, and the many other medical bills that tend to pile up in the retirement years — that's what this pocket of money is there for.

And the appeal comes down to taxes. Money can go into the account in a tax-advantaged way, it can grow without being taxed along the way, and when it comes back out to cover a genuine medical cost in retirement, it can come out tax-free. Paying medical bills with money that was never taxed on the way in or the way out is a rare and valuable thing — and it's the reason this obscure little account gets the attention it does from people who know about it.

There are some guardrails. The account is meant for the retired worker and, generally, a spouse and dependents. And there are limits on how much money can be funneled into the 401(h) room compared to the rest of the plan, so it can't swallow the whole house. But within those boundaries, it's a genuinely powerful way to set aside money for one of retirement's biggest and most unpredictable expenses.

To keep the two pieces straight, here's the plan-versus-account distinction at a glance:

The bottom line

The word "plan" in "401(h) plan" is the part that throws everyone off. It's really an account — a specialized room built onto an existing pension, with the single job of setting aside money for medical costs in retirement. It can't stand on its own, it needs a pension to attach to, and in exchange for those conditions it offers something unusual: a way to pay for healthcare in your later years using dollars that dodge tax coming and going.

For most people this will never come up, because most people don't have the kind of pension a 401(h) account attaches to. But for a business owner — especially one already thinking about a pension or cash balance plan — it can be a quietly brilliant addition that turns a looming retirement expense into a tax-advantaged one.