The Solo 401(k): A Wealth-Building Game Changer for One-Employee Businesses
The Solo 401(k): A Powerful Retirement Tool for One-Employee Businesses
If you are self-employed with no employees other than a spouse, the Solo 401(k) is one of the most powerful retirement savings vehicles available. It allows significantly higher contributions than a traditional or SEP IRA, and it provides flexibility that other plans cannot match.
How It Works
A Solo 401(k) allows you to contribute in two capacities: as an employee and as an employer.
Employee Contributions
As the employee of your own business, you can defer up to $23,000 of compensation per year (for 2024). If you are age 50 or older, an additional catch-up contribution of $7,500 is available, bringing the employee portion to $30,500.
These contributions are made on a pre-tax basis (reducing your taxable income) or on a Roth basis (contributed after-tax but growing tax-free).
Employer Contributions
As the employer, you can contribute an additional 25% of your net self-employment income (for sole proprietors and single-member LLCs) or 25% of your W-2 compensation (for S-Corp owners).
The combined employee and employer contributions cannot exceed $69,000 per year (for 2024), or $76,500 if you are 50 or older.
Why It Matters
The combined contribution limits make the Solo 401(k) significantly more powerful than other retirement options for self-employed individuals. A SEP IRA, for example, allows only employer contributions of up to 25% of compensation. It does not include an employee deferral component. This means for moderate income levels, the Solo 401(k) allows substantially larger total contributions.
Example: Julie's Solo 401(k)
Julie is a self-employed consultant earning $120,000 in net self-employment income. She is 45 years old.
Employee contribution: Julie defers $23,000 of her income.
Employer contribution: Julie's adjusted net self-employment income (after the self-employment tax deduction) is approximately $110,000. She can contribute 25% of that, or about $27,500.
Total contribution: Approximately $50,500.
If Julie used a SEP IRA instead, her maximum contribution would be approximately $27,500. The Solo 401(k) nearly doubles her retirement savings capacity.
Additional Benefits
Roth option. Unlike a SEP IRA, the Solo 401(k) allows Roth contributions. This can be valuable for owners who expect to be in a higher tax bracket in retirement or who want tax diversification.
Loan provision. Many Solo 401(k) plans allow you to borrow up to $50,000 or 50% of the account balance (whichever is less) from the plan. While borrowing from retirement funds should be approached cautiously, this feature provides a safety net.
No required minimum distributions for Roth. Roth Solo 401(k) accounts were previously subject to RMDs, but recent legislation has eliminated this requirement, allowing tax-free growth for a longer period.
Who Qualifies
The Solo 401(k) is available to self-employed individuals and business owners with no full-time employees other than a spouse. If you have employees, other plan types (such as a traditional 401(k) or SIMPLE IRA) may be more appropriate.
Getting Started
Solo 401(k) plans can be opened through most major brokerage firms. The plan must be established by December 31 of the tax year, though contributions can typically be made until the tax filing deadline.
Consult with your CPA to determine the optimal contribution strategy based on your income, tax situation, and retirement goals. The Solo 401(k) is a powerful tool, but it works best when integrated into a broader financial plan.