You did it. You’re self-employed. You answer to no one, you set your own hours, and you get to keep all the profits. The only downside is you also have to be your own HR department. That means setting up a real retirement plan. The two most common options you’ll hear about are the SEP IRA and the Solo 401k. The debate over **SEP IRA vs Solo 401k** can seem complicated, but it’s not.
Let’s get this out of the way right now: For most successful freelancers and single-owner businesses, the Solo 401k is the superior choice. It’s not even close.
I’m going to explain why.
So What’s the Difference?
First, a quick definition so we’re on the same page.
A SEP IRA, or Simplified Employee Pension, is basically a traditional IRA with much higher contribution limits. As the business owner, you make contributions for your employees. Since you are the employee, you make contributions for yourself. It’s simple and easy to understand.
A Solo 401k is a traditional 401k plan designed for a single business owner and their spouse. You wear two hats here. You make contributions as the "employee" and as the "employer". This two-hats distinction is the most important part of the entire discussion.
The Contribution Rules Are the Whole Game
This is where the Solo 401k pulls away from the competition. It’s all in how you contribute.
With a SEP IRA, you can only contribute as the "employer". The contribution is limited to 25% of your net adjusted self-employment income, up to a maximum of $69,000 for 2024.
With a Solo 401k, you contribute as both the "employee" and the "employer".
As the "employee," you can contribute 100% of your compensation up to the annual limit. For 2024, that’s $23,000 ($30,500 if you’re age 50 or older).
As the "employer," you can *also* contribute up to 25% of your net adjusted self-employment income.
The total combined "employee" and "employer" contributions cannot exceed the $69,000 limit for 2024.
Let’s use an example. Say your self-employed net income is $100,000.
With a SEP IRA, your maximum contribution is 20% of that net income (the math gets a little weird, it's effectively 20% of your net, not 25%). So you can contribute about $20,000.
With a Solo 401k, you could contribute $23,000 as the "employee" plus the same $20,000 as the "employer," for a total of $43,000. That is more than double the savings. More money in your retirement account is a good thing. This is the core reason the Solo 401k is the better **self-employed retirement plan** for most people.
You Want a Roth Option? Of Course You Do.
Here is another massive, undeniable win for the Solo 401k.
Your "employee" contributions to a Solo 401k can be made to a designated Roth account. This means you contribute after-tax dollars, but your qualified withdrawals in retirement are completely tax-free. Paying the tax now, especially if you expect to be in a higher tax bracket later, is a powerful strategy.
SEP IRAs have no Roth option. Period. The only way to get Roth money from a SEP is to contribute and then do a separate Roth conversion, which is an administrative headache and can have other tax consequences.
Having a built-in Roth option makes the Solo 401k the clear winner for anyone who wants tax diversification in retirement. And you should want that.
Can I Borrow From My Retirement Plan?
Sometimes, life happens. You need access to cash and you need it now.
A Solo 401k plan can be written to allow for participant loans. You can typically borrow up to 50% of your vested balance, with a maximum loan of $50,000.
You cannot borrow from a SEP IRA. Ever. The only way to get money out is to take a taxable distribution and pay a 10% penalty if you’re under 59.5.
Now, let's be clear. Borrowing from your 401k should be a last resort, not a piggy bank. It can disrupt your compounding and has to be paid back. But having the option for a true emergency is far better than not having it. It's an escape hatch. The lack of a loan provision is another major flaw in the **SEP IRA rules**.
Okay, Is the Solo 401k Harder to Manage?
This is the one area where the SEP IRA has a slight advantage. It is a bit simpler.
You can establish and fund a SEP IRA for a given tax year all the way up until your tax filing deadline, including extensions. This is great for procrastinators.
A Solo 401k plan document must be signed and established by December 31 of the tax year you want to make contributions for. You can still fund the "employer" portion up until your tax deadline, but the plan itself has to exist before the year ends. This is a hard deadline. Do not miss it.
Once your Solo 401k balance exceeds $250,000, you also have to file a simple annual information return called a Form 5500-EZ. It’s a one-page form that takes about 15 minutes to fill out. It is not difficult.
Don't let this minimal administrative work scare you away from the far superior plan. Sacrificing higher contribution limits and a Roth option just to avoid a December 31 deadline and a simple form is a bad trade.
So Which One Should I Pick?
Let's recap the **SEP IRA vs Solo 401k** scorecard.
The Solo 401k allows for significantly higher contributions at most income levels due to the "employee" deferral. The **Solo 401k contribution limits** are a huge advantage.
The Solo 401k has a Roth feature. The SEP IRA does not.
The Solo 401k can allow for loans. The SEP IRA does not.
The SEP IRA is slightly easier to set up, with a more flexible deadline.
The choice is obvious. The Solo 401k is the **best retirement plan for freelancers** and business owners who are serious about saving. The SEP IRA is a decent starter plan, but it’s one you will quickly outgrow if you are successful.
My advice is to skip the starter plan and go straight to the one that will serve you best for the long haul. Your future self will thank you for making the slightly harder, but much smarter, choice.