What's the best retirement plan for a self-employed person? It depends on whether you have employees and how much you want to contribute: a Solo 401(k) generally allows the highest contributions for a business owner with no employees, a SEP-IRA is simpler to administer but contributes as a flat percentage of income, and a SIMPLE IRA works well for small businesses with a handful of employees who want an easy, low-cost plan.

Article Summary

  • A Solo 401(k) lets you contribute both as the 'employee' and the 'employer' of your own business, which typically allows meaningfully higher total contributions at moderate income levels than a SEP-IRA.
  • A SEP-IRA is the simplest to set up and maintain, but if you have employees, you generally must contribute the same percentage of pay for them as you do for yourself.
  • A SIMPLE IRA caps contributions lower than the other two options but requires far less paperwork, making it a common choice for small businesses that already have a few employees and want to offer a retirement benefit without heavy administrative overhead.

"The four most dangerous words in investing are: 'this time it's different.'"

Sir John Templeton

Self-employed people don't get a company 401(k) match showing up automatically in a benefits packet, which means retirement saving has to be a deliberate decision made once a year instead of a payroll default nobody thinks about. That's a genuine disadvantage of working for yourself — but it also comes with more choice than most W-2 employees ever get, since business owners can pick from several plan structures, each shaped for a slightly different business size and savings goal.

SEP-IRA: Simple, but Contributions Scale With Employees

A Simplified Employee Pension IRA is popular with solo business owners largely because it's easy to open and requires minimal ongoing paperwork — contributions are calculated as a percentage of net self-employment income, up to an annually adjusted cap, and there's no requirement to contribute every year, which suits businesses with unpredictable income. The tradeoff shows up the moment you hire employees: if you contribute a given percentage of your own income, you're generally required to contribute that same percentage for every eligible employee, which can turn a low-maintenance plan into a real cost center as a team grows.

This makes a SEP-IRA a strong fit for solo freelancers and consultants who want simplicity and flexibility more than maximum contribution room, but a less obvious fit for a business that already has, or expects to add, several employees.

Solo 401(k): Higher Contribution Room for Owner-Only Businesses

A Solo 401(k), sometimes called an individual or one-participant 401(k), is designed for a business owner with no employees other than a spouse. It allows contributions in two capacities: an 'employee' contribution based on your compensation, plus an 'employer' profit-sharing contribution based on a percentage of business income, and combining both roles typically allows a business owner to set aside more per dollar of income than a SEP-IRA would allow at the same income level, particularly at moderate income.

The tradeoff is more administrative complexity: Solo 401(k)s generally require a bit more setup paperwork, and once plan assets cross a certain size, an annual filing with the IRS becomes required. Many providers also offer a Roth option within a Solo 401(k), letting a business owner mix pre-tax and after-tax contributions in a way a traditional SEP-IRA typically doesn't allow directly.

SIMPLE IRA: Built for Small Teams

A Savings Incentive Match Plan for Employees IRA is aimed at small businesses that already have employees and want to offer a retirement benefit without the cost and complexity of a full 401(k) plan. Employers are generally required to either match employee contributions up to a set percentage of pay or make a smaller fixed contribution for all eligible employees, and the plan carries lower administrative burden than a traditional 401(k), with less annual paperwork.

The tradeoff is a lower total contribution limit than either the SEP-IRA or Solo 401(k) typically allow, which makes a SIMPLE IRA a better fit for a business owner primarily focused on offering a straightforward benefit to a small staff rather than maximizing their own personal retirement contributions.

A Practical Framework for Choosing

Start with one question: do you have employees, or will you soon? If it's just you (and possibly a spouse), a Solo 401(k) generally offers the most contribution flexibility and is worth the modest extra setup effort for most people saving seriously for retirement. If you have or plan to have employees and want simplicity over maximum personal contributions, a SIMPLE IRA is usually the more practical choice. A SEP-IRA sits in between — simple to run solo, but reconsider it carefully the moment you're weighing whether to hire.

Because contribution limits, income thresholds, and plan rules are adjusted periodically and vary by provider, confirm current-year figures with a retirement plan provider or tax professional before opening an account, and revisit the choice if your business structure changes significantly, since the right plan at five employees may not be the right plan at fifteen.