The Solo 401(k) Maneuver: Why a SEP-IRA is for Amateurs and Your Banker is Lying to You

Listen, I’ve been around the block, and if there is one thing I’ve learned about the financial services industry, it’s that they love small business owners. Not because we’re the ‘backbone of the economy’ or any of that drivel they put in commercials, but because we are often too busy keeping the lights on to notice how badly they are gouging us on plan fees. Most of my peers are sitting on a generic SEP-IRA or a high-fee SIMPLE IRA because some suit at a big-box bank told them it was ‘easy.’ Easy for whom? Easy for the bank to collect 1% on your total Assets Under Management (AUM) while you do all the work.

Here’s the rub: if you are a business of one (or you and a spouse), the standard industry advice is garbage. You are leaving tens of thousands of dollars in potential contributions and tax deductions on the table every single year. It is time to talk about the Solo 401(k)—specifically, the one that gives you ‘checkbook control.’ Don’t let the marketing folks fool you; you don’t need a massive HR department to run a world-class retirement engine.

The Common Myth vs. The Canny Reality

The Common Myth: ‘A SEP-IRA is the best way for a solo-preneur to save because it has high limits and low paperwork.‘

The Canny Reality: A SEP-IRA is a leash. While the limits look high (25% of compensation), you are limited strictly by your profit. In a bad year? You contribute next to nothing. In a Solo 401(k), however, you wear two hats: Employee and Employer. In 2024, you can stash away $23,000 as an employee deferral ($30,500 if you’re over 50—and if you’re reading my column, you likely are) regardless of whether your business made $50,000 or $500,000. You then add the employer side on top.

Let’s look at the numbers. If you net $100,000 in your S-Corp, a SEP-IRA might let you stash roughly $25,000. A Canny Senior with a Solo 401(k) is putting away over $50,000 into the same tax-sheltered vehicle. That is $25,000 more that the IRS cannot touch this year. If that isn’t a win, I don’t know what is.

Avoid the “AUM Trap”

When you go to a place like Edward Jones or a local regional bank, they will offer you a ‘prototype’ 401(k) plan. They’ll tell you there are ‘no setup fees.’ That’s where they hook you. Instead, they’ll dump your hard-earned cash into mutual funds with 1.2% expense ratios and collect a trailing commission.

I prefer the ‘unbundled’ approach. If you want specific names, look at providers like Guideline or Employee Fiduciary. Guideline, for example, charges a flat monthly fee (often as low as $39 + $8 per participant) rather than a percentage of your total wealth. Over twenty years, the difference between a 1% AUM fee and a flat $500-a-year fee is the difference between retiring in a studio apartment in Des Moines or a three-story flat in the backstreets of Porto.

The Checkbook Control Alpha

For those of you who really want to stick it to the traditional institutions, look into Nabers Group or Mysolo401k.net. These folks specialize in ‘Self-Directed’ Solo 401(k)s. Why does this matter? Because most 401(k) plans restrict you to a menu of 15-20 mediocre mutual funds. A true Canny Senior wants the freedom to buy private tax liens, physical gold, or small-bay industrial real estate inside their plan.

Imagine buying a small commercial property for $200k within your Solo 401(k). All the rent checks come back into the 401(k) tax-free. No personal income tax, no capital gains. This is the ‘insider’ move that the wealthy use while they tell the rest of us to keep buying target-date funds.

Pro-Tip: The Mega Backdoor Roth Maneuver

If you have a high-profit year, ask your plan provider if their document supports ‘After-Tax Contributions’ and ‘In-Plan Conversions.’ This allows you to perform the ‘Mega Backdoor Roth.’ Essentially, you can stuff up to the total limit ($76,500 for those 50+ in 2024) into a Roth sub-account. It sounds complicated, but here is the payoff: once that money is in the Roth side, it grows forever tax-free and is never taxed again upon withdrawal. You’re essentially building a private tax-free treasury that would make a hedge fund manager weep.

The Administrative Guts

Don’t let anyone scare you with the ‘Form 5500-EZ.’ Yes, once your plan assets cross the $250,000 threshold, you have to file a simple return with the IRS. It’s two pages long. If you can read a restaurant menu, you can fill it out. If you can’t, pay a CPA three hundred bucks to do it for you. Do not forgo the tax-shelter of a 401(k) because you’re afraid of a two-page form. That’s exactly what the lazy crowd does.

Specific Hardware for Your Strategy

If you’re going to manage this yourself, stop using Excel. It’s 2024. Use tools like Lunch Money for multi-account tracking or Kubera if you start getting into the ‘weird’ assets like crypto or foreign land. For the index fund portion of your 401(k), stick to the heavy hitters: Vanguard Total Stock Market (VTI) or Avantis US Small Cap Value (AVUV) if you want that factor tilt. Keep your expense ratios below 0.10%. Anything higher is just you subsidizing someone else’s yacht.

Canny Advice on the UK/AU Counterparts

I know we have some global readers. If you’re in the UK, your version is the SIPP (Self-Invested Personal Pension). If you’re a Director of your own limited company, don’t pay yourself a salary only to be taxed on it; have the company make direct contributions to your SIPP. It’s an allowable business expense, reducing your Corporation Tax while beefing up your pot.

In Australia? It’s all about the SMSF (Self-Managed Super Fund). The setup costs are higher ($2k-$3k roughly), but once you have over $300k in super, the percentage-based fees at the big retail funds become a joke. Go the SMSF route, buy a commercial unit, and lease it back to your own business at market rates. It’s legal, it’s savvy, and it keeps the money in your pocket.

The Wrap-Up

At the end of the day, a small business 401(k) isn’t just an account—it’s a weapon. Most people use it like a dull butter knife because that’s what their financial advisor told them to do. I’m telling you to sharpen it. Demand checkbook control, minimize the AUM fees, and max out those ‘Catch-Up’ contributions while the rules are still in your favor.

Don’t let the marketing folks tell you that you’re ‘too small’ for a real plan. You’re only as small as your strategy. Now, get your paperwork in order before the end of the fiscal year, or don’t complain to me when you see your tax bill in April.

Stay sharp,

Canny Senior