The Power of the Solo 401(k)
Being self-employed means working tirelessly to live out your vision and build your business. When it's finally time to give serious thought to a retirement savings vehicle, the SEP IRA is usually the first thing that comes to mind – and maybe it’s the only thing you remember your accountant mentioning. While the SEP IRA might be perfect for your situation, it can also mean leaving real money and flexibility on the table. Another option sole proprietors can consider is a solo 401(k).
The Difference
A Solo 401(k) is great for sole proprietors who are already taking full advantage of their SEP IRA and want more saving power. If used correctly, it can be a powerful wealth-building tool. This is available to sole proprietors, LLCs, S-corps, and 1099 workers. It carries a higher contribution limit than a SEP IRA, and can even include a Roth option.
A Solo 401(k) can include a Roth component, which can be critical for younger people, or those expecting higher future tax rates. Saving in a Roth Solo 401(k) means saving after-tax dollars that compound into tax-free retirement income. Doing this in a Solo 401(k) is more powerful than a Roth IRA due to the higher annual contribution limit.
The contribution limit of a Solo 401(k) is the core differentiator for sole proprietors. Since you are both the employer and employee, you can contribute as both. This could mean contributing up to $72,000:
Employee Deferral: $24,500 (or 100%) of compensation.
Employer Profit-Sharing: up to 25% of W-2 wages (S-Corp) or 20% of net self-employment income (sole proprietor or LLC).
This does not include the additional catch-up contributions available to certain age groups. These can bring totals up to $80,000 and $83,250, respectively:
Ages 50-59 & 64+: $8,000
Ages 60-63: $11,250
The Solo 401(k) also includes a loan provision. While we generally don’t recommend taking loans from retirement plans, a Solo 401(k) lets you borrow up to 50% of your vested balance (max $50,000). The SEP-IRA simply doesn’t have this feature, which adds to the power of the Solo 401(k).
Trade-Offs to Consider
Of course, you should consider trade-offs when comparing two retirement plans. One catch with the Solo 401(k) is that it requires more administrative setup and costs more than a SEP-IRA. Once a Solo 401(k) exceeds a balance of $250,000, there are additional forms to file annually. Setting one up also requires slightly more upfront work, which is still likely worth it, but it's a consideration nonetheless.
The question is, is a Solo 401(k) right for you?
Best Fit: Sole Proprietors with a meaningful net income (especially true for those who are already maxing out their SEP-IRA).
Not Ideal: Someone with either low or highly variable income. The SEP-IRA's simplicity wins in cases like these.
The bottom line: If you work for yourself and want to maximize your retirement savings, the Solo 401(k) is worth considering. To learn more or see what is best for your situation, set up a meeting to discuss these options with one of our financial advisors today.




