401(h) Investments: The #1 Way to Effectively Manage Assets

Most articles about 401(h) accounts focus on getting money in: the contribution limits, the tax deductions, the plan design. Far fewer talk about what happens next — how the money should actually be invested once it's sitting in the account.

That's a mistake, because with a 401(h), investment strategy isn't just about growing your balance. The way the account performs directly affects your future contributions, your tax deductions, and even what happens to the money at the end of your life. Get the investment approach wrong in either direction — too hot or too cold — and you create problems that no amount of clever plan design can fix after the fact.

This article is written for the solo business owner: no employees, just you (and perhaps a spouse on payroll). Here's what you need to know.

Here's something that surprises many solo owners: when you establish a retirement plan with a 401(h) account for your own business, you are typically the plan's trustee. There's no outside institution deciding how your money gets invested, no menu of pre-selected mutual funds like the big-company 401(k) you may remember from a former job.

As trustee, you direct the investments as you see fit. You can open the plan's investment account at essentially any major brokerage or custodian that accepts retirement plan assets, and within that account you can hold the usual building blocks — stocks, bonds, mutual funds, ETFs, money market funds, CDs, and so on.

That freedom is genuinely valuable, but it comes with a role to respect. As trustee, you're managing the money for the benefit of the plan, which means investing prudently, keeping the medical account assets properly tracked and separate from the retirement assets on the books, and avoiding self-serving transactions (no lending plan money to your business or buying assets from yourself). None of that is difficult for an owner-only plan — your administrator will keep you inside the lines — but it frames the mindset: this is a benefit fund with a job to do, not a trading account for taking flyers.

So how should the money be invested? For most solo owners, the honest answer is: somewhere in the middle. Not aggressive, not ultra-conservative — balanced.

That might sound like boring advice, but with a 401(h) it's structural, not just temperamental. As we'll see below, this account punishes extremes in both directions. A portfolio that shoots the lights out creates real problems. A portfolio that barely grows creates different, equally real problems. The account performs its job best when it grows steadily toward a target — the projected cost of your retirement healthcare — rather than sprinting past it or limping behind it.

In practice, a balanced posture often looks like a moderate mix of stocks and bonds — the kind of allocation a prudent person might choose for money with a specific job and a specific timeline. Many owners land somewhere in the neighborhood of a classic balanced portfolio, adjusting for their age and years until retirement.

One important disclaimer before going further: I'm not an investment advisor, and nothing here is investment advice. The right allocation for you depends on your age, your timeline, your other assets, and your tolerance for risk. Take the framework from this article to your financial advisor and build the actual portfolio together — ideally with your plan administrator in the loop, since the investment strategy and the funding strategy are two sides of the same coin.

If your 401(h) is attached to a cash balance plan, you've probably encountered the concept of an interest crediting rate — the rate specified in the plan document that participant accounts are credited with each year. Cash balance trustees often try to invest so that actual returns land close to that stated rate, because big gaps between the two create funding complications on the retirement side.

Here's the good news: the 401(h) account has no interest crediting rate. There's no number written into the plan document that the medical account is supposed to earn, and therefore nothing to mirror or manage toward. The medical account simply earns whatever its investments earn.

That gives you more breathing room on the 401(h) side than you have on the cash balance side. But don't mistake breathing room for a free-for-all. While there's no stated rate to track, the account's actual returns still have consequences — and this is where the two big pitfalls come in.

It sounds strange to call strong investment performance a problem, but with a 401(h), outsized returns create two genuine issues.

First, great returns shrink your future contributions — and your tax deductions with them. Remember that the 401(h) is funded toward a target: the actuarially projected cost of your retirement medical benefits. That target is the ceiling. If your investments race ahead of schedule, the gap between where the account stands and where it needs to be gets smaller — which means the remaining contributions get smaller too. For an owner who set up the plan partly for the annual deductions, watching market gains crowd out deductible contributions is a real cost. The market's growth replaced money you would have contributed with pre-tax dollars.

Second, an oversized account creates a use-it-or-lose-it problem at the end of life. The 401(h) exists to pay medical expenses for you and your spouse. Practically speaking, the account needs to be spent down on qualified healthcare costs during your lifetimes. If both you and your spouse pass away with money still sitting in the medical account, that leftover balance doesn't simply flow to your heirs the way a 401(k) would. Instead, the excess generally reverts to the plan sponsor — your business — and that reversion comes with punishing taxes and penalties that can consume the majority of the leftover amount. It is one of the harshest outcomes in all of retirement planning, and it's the reason nobody should treat the 401(h) as a wealth-transfer vehicle.

Put those together and the lesson is clear: you don't want this account to dramatically overshoot its target. The goal is a fully funded medical account that gets substantially used up — not a swollen one that strands money at the end.

Now the other direction. If the investments are parked too conservatively — all cash, all CDs, returns that trail inflation — the account can arrive at retirement underfunded for its actual job.

Healthcare costs are the one retirement expense that reliably grows faster than general inflation. Premiums, out-of-pocket costs, dental work, and especially long-term care all get more expensive as you age. If the account limps along at 1–2% while medical inflation runs well ahead of that, the purchasing power of your medical fund erodes every single year.

And unlike the retirement side of your plan, the 401(h) has less room to simply "make it up with bigger contributions later." Your contributions are bounded by the subordination requirement (the medical funding must stay proportional to the retirement funding), by annual dollar limits, and by the actuarial cost target itself. If you're ten years from retirement and the account is badly behind, the levers available to catch up are limited — especially if your retirement plan contributions are winding down at the same time.

The result of chronic underperformance is painfully simple: you reach retirement, healthcare bills arrive on schedule, and the tax-free fund you built specifically for those bills runs dry too early. Every medical dollar you spend after that comes from taxable sources — exactly what the 401(h) was created to prevent.

The 401(h) rewards a Goldilocks investment approach, and that's not an accident — it's baked into how the account works. Too hot, and you crowd out your own deductions while risking a heavily penalized reversion of whatever's left at the end. Too cold, and the fund fails at the one job it was hired to do.

Just right — a balanced, steadily growing portfolio aimed at your projected healthcare costs — and the account delivers everything that makes it special: deductible contributions on the way in, tax-free growth in the middle, and tax-free healthcare money for as long as you and your spouse need it.

As the trustee of your own plan, the investment decisions belong to you, and that's a genuine advantage — you can build exactly the portfolio the account's job calls for. Just don't build it alone. Your financial advisor should shape the allocation, and your plan administrator and actuary should stay in the conversation, because every investment result flows back into next year's contribution math. When those professionals are coordinated, the account stays on target: funded fully, spent purposefully, and never so large that the end-of-life reversion rules ever come into play.

A well-invested 401(h) isn't the one with the highest return. It's the one that's empty at exactly the right time — after decades of paying your healthcare bills with tax-free dollars.