At The Money: How to Max Out Your Small Business Retirement Plan with Dan Larosa (April 29, 2026)
Are you running a small business or “side hustle” that generates real income? You may not be taking full advantage of the many retirement savings plans available.
Full transcript below.
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About this week’s guest:
Dan LaRosa is Director of Corporate Retirement Plans at Ritholtz Wealth Management, overseeing more than $400 million in various plans. He is a Qualified Plan Financial Consultant (QPFC) and Accredited Investment Fiduciary (AIF) and partner at the firm.
For more info, see:
Professional Bio
LinkedIn
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TRANSCRIPT: At the Money: Retirement Plans for Small Business Owners and Solo Practitioners
with Barry Ritholtz and Dan LaRosa
Intro: If you ever get annoyed
Look at me I’m self-employed
I love to work at nothing all day
And I’ll be…Taking care of business every day
Taking care of business every way
Barry Ritholtz: Saving for retirement is challenging, especially if you’re a small business owner or solo practitioner. Various retirement plans like SEPs, solo Ks, and Mega Backdoor Roths can really be confusing. There are so many choices, the options have increased, and the rules have become even more complex. To help us unpack all of this and what it means for your retirement portfolio, let’s bring in Dan LaRosa. He’s an expert in corporate qualified retirement accounts, working with clients all over the country. Full disclosure: Dan runs the corporate retirement planning group at Ritholtz Wealth Management, my firm, and he’s one of my partners. So Dan, let’s start basic. What options exist for either solo or small business owners if they want to save more money for retirement on a tax-deferred basis?
Dan LaRosa: Sure, Barry. The main options, at least the options that you’ll more likely than not start with, are a SEP IRA or a solo 401(k). A lot of people default to a SEP, even if they’re in a situation where the solo K might actually be a better option. The SEP is just simpler, and it’s often the first thing that your CPA is going to mention to you or recommend. Solo 401(k)s with a Mega Backdoor Roth feature have also gotten more popular in recent years. And once you have one of those in place, if you’re still looking for more tax deferral opportunities, a defined benefit cash balance plan might be a good fit.
Barry Ritholtz: Really interesting. Last time when we talked about Mega Backdoor Roth, the total you can contribute if you’re working for a firm is $72,000. But these days, so many people have side hustles. They set up an LLC or a little company to do something, and maybe they’re a solo practitioner, maybe it’s a husband and wife, and this is income beyond what their regular paycheck is. If you maxed out your Mega Backdoor Roth at your regular employer and you have this side gig, how much can you add above that $72,000?
Dan LaRosa: A lot of people don’t realize this, but each plan has its own $72,000 limit. The only thing that aggregates across all plans is the $24,500 employee deferral limit. That’s the amount of money that each of us can contribute to our 401(k) plan. But each plan has a $72,000 limit. So if you have a side hustle or a solo gig, you can set up a solo 401(k) with a Mega Backdoor Roth, or even just a regular solo K or SEP. As long as your income is high enough, you can make additional contributions into that retirement plan of up to $72,000.
Barry Ritholtz: And how do they figure out the $72,000? Is that based on over $145,000 or $150,000 a year, or is there a percentage calculation? Where does that $72,000 number come from?
Dan LaRosa: The $72,000 number is just the overall 401(k) limit, or retirement plan limit. The SEP actually has the same, but how to get there is a bit of a loaded question, and it’s different for each of those plans. The SEP IRA is technically all employer contributions, so your contribution amounts are directly tied to your earnings. You can contribute up to 20% of your net income to get to that $72,000 number. So you do the math: you need an income of $360,000 to max out and get to that $72,000. The solo K — only a portion of your contribution is tied to your income, so you can contribute a lot more on a lower income. An income of about $235,000 to $240,000 will get you to that $72,000 max. The Mega Backdoor Roth is a bit of a cheat code. As long as your net income is $72,000, you can contribute all of that into the solo 401(k).
Barry Ritholtz: What are the trade-offs between the SEP IRA, the solo 401(k), and the solo Mega Backdoor Roth? It sounds like this is really complex. Are there any advantages or disadvantages to each of these?
Dan LaRosa: It is complex, and that’s why a lot of people just default to a SEP because it’s easier, but it really depends on your income and your objectives. If your income is on the lower side, or maybe it varies from year to year, the solo K is going to certainly allow the most flexibility and let you maximize your contribution even in those lower income years. If Roth contributions are the objective, you just can’t beat the solo K with the Mega Backdoor Roth. It’s going to allow you to contribute up to $72,000 in Roth contributions. You can’t find that anywhere else. But if your income is consistently high and Roth is not a priority — you just want to maximize your tax deferrals — then a SEP is going to get the job done.
Barry Ritholtz: So if you’re making $100,000 or less, or $250,000 or more, or a million or more, that may affect which of these you choose.
Dan LaRosa: Yeah, for sure. And again, assuming you want to maximize your contributions, you want to contribute as much as you can — the lower your income is, the more powerful the solo 401(k) is. You’re just going to have a lot more flexibility with your contributions. And the higher your income goes, you’re fine with a SEP, because that 20% of your net income, if your income is high enough — again, over $353,000 to $360,000 — you’re going to be putting $70,000-plus away a year.
Barry Ritholtz: Really intriguing. How do you count an employee if you’re a solo 401(k)? Does it matter if you’re 1099 or W-2 or part-time or spouse? A husband and wife own a small business — who counts as an employee for these?
Dan LaRosa: The solo 401(k) is easy. Once you have a W-2 employee that becomes eligible, it’s no longer a solo K, and it’s going to be hard for the owner to max out without contributions to that employee. The SEP is a little bit different. The eligibility requirement is referred to as the three-of-five rule. Once you have an employee that’s worked three out of any five years earning more than something nominal — I think $700 or $750 — they’re eligible, and that means they would receive the same percentage of compensation that you’re giving yourself. So that could get expensive in a hurry. As far as a spouse being classified as an employee, you can have your spouse in the solo K and still run the solo K — you’re not going to be disqualified. Your spouse counts as another owner. Also, a lot of people don’t realize that a solo K can have multiple partners in it. In other words, if a company has four different partners, you can have all four partners and each of the spouses in the solo K, as long as there are no non-owner employees. You’re good to go.
Barry Ritholtz: And that’s $72,000 per person, husband and wife?
Dan LaRosa: Per person. Again, assuming the income allows for it, but yes.
Barry Ritholtz: Really intriguing. Let’s talk about the administration and compliance burdens of these various options. I know you need plan documents, and then there’s the infamous Form 5500, and there are all sorts of recordkeeping rules. What do small businesses have to know? How do they avoid getting tripped up by all of this?
Dan LaRosa: SEPs are the easiest for sure. It’s just a few forms to set up, and there’s no annual maintenance, no filings. The owner just needs to track their contributions. With the solo 401(k), there is a little more, and the biggest thing is: once the plan reaches a total of $250,000 in total plan assets on December 31st of any plan year, a Form 5500-EZ must be filed. That’s basically the tax return for the plan. It’s a really simple form, but the penalties are insane. It’s $250 a day, up to $150,000. For a very long time, this really wasn’t regulated, but in recent years we’ve actually really seen an uptick in enforcement of these penalties. It shouldn’t prevent you from setting up a solo K, but it’s very important to be aware of this when you set the plan up.
Barry Ritholtz: Let’s talk setup and funding. When do these plans need to be set up and funded by? We’re recording this in February of 2026. Is it too late to set something up and fund it for 2025? What does the timing look like?
Dan LaRosa: No, you still have plenty of time. The SEP is an IRA, so just like any other IRA, it’s always been able to be established and funded for a prior year. You have until tax filing plus extension to get that plan funded. Effective, I believe, last year, the solo K got a lot more lenient and kind of follows that same path as the SEP. So you can establish a solo K and fund it for the prior year, with some caveats. If the plan is set up by April 15th — say for this year, the plan is set up by April 15th, 2026 — you can make employee and employer profit-sharing contributions. So you can get to that full $72,000, as long as you fund by the extended filing deadline of October 15th of this year. If you set up the plan after April 15th of this year, you can only make your employer contributions — your profit-sharing contributions — to it. So you’re going to be a little more limited as to how much you can fund.
Barry Ritholtz: Let’s talk about succession planning or exit planning, or with a husband and wife, the death of a spouse. Is any one structure superior to others? If the owner expects to sell the business or retire, or maybe even bring in partners, which is the most flexible here?
Dan LaRosa: The solo K is always going to give you more flexibility than the SEP. If there are multiple partners in the solo K, they can each contribute different amounts, or some not at all. SEP contributions are pro rata, so everyone has to get the same percentage of comp. So obviously not ideal if there are going to be multiple partners or people with different goals involved. On the other hand, SEPs are just structurally a lot simpler, easier to unwind if necessary. So really, one isn’t always going to be better than the other. It really depends on the situation.
Barry Ritholtz: One of the advantages of 401(k)s is the creditor and ERISA protections. Even if you lose litigation, nobody can take your retirement money away. Do the same things apply to the SEP or solo 401(k)? Is it really the same set of rules?
Dan LaRosa: What you’re talking about with 401(k)s is that additional ERISA protection. ERISA plans — which are your employer 401(k)s and defined benefit plans — have the most creditor protection of all qualified plans. It is a common misconception that solo Ks, because they’re 401(k)s, also have this enhanced creditor protection. They do not, because they don’t cover any non-owner employees. They don’t qualify for that extra ERISA protection. So SEPs and solo Ks are on the same level in terms of creditor protection — the same as a regular IRA. If you are in a litigious profession and that protection is important, it might be a good idea to roll some of those IRA or solo K balances into your employer 401(k) or defined benefit plan, if you have one available.
Barry Ritholtz: That is really interesting. I would imagine doctors — I remember back in the day, brokers used to get sued on a regular basis — so that seems to be worthwhile. Last question: if you have a business owner that’s married, whether or not the spouse works for them in the business, can that spouse also open either a solo 401(k) or SEP or Mega Backdoor Roth 401(k) and legitimately increase the household contribution, assuming the revenue allows for it?
Dan LaRosa: Yeah, as long as your spouse is a legitimate employee of your solo practice, you can do that, and it has tremendous benefits. But they have to be an employee on payroll, receiving wages. The solo K allows you to contribute a lot even on a low income. A spouse would be able to actually contribute 100% of their compensation up to that $24,500 — or if you’re over 50, $32,500. That adds up quickly. It’s an easy way to supercharge your household savings — adding your spouse to your solo practice retirement plan.
Barry Ritholtz: All this stuff is so intriguing, and it’s just another tool in the toolbox. To wrap up: if you’re a small business owner or solo practitioner and you haven’t taken advantage of the various tax-deferred retirement savings plans — whether it’s a SEP, a solo 401(k), or a Mega Backdoor Roth 401(k) — speak to your fill-in-the-blank financial advisor, accountant, or tax professional, and get hopping on this. This is an enormous way to accumulate wealth over the next 10 or 20 years and have various options of whether this goes in pre-tax or post-tax, which allows you to maximize your long-term returns. I’m Barry Ritholtz. You are listening to Bloomberg’s At the Money.
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