Retirement Plans for Small Business Owners: SEP IRA, Solo 401(k), and More

Small business owners often put retirement savings on the back burner — there's no employer automatically enrolling you in a 401(k), no HR department handling the paperwork. But that also means you have access to some of the most powerful, high-contribution retirement plans available, often far more generous than what a typical employee plan allows.

Why This Deserves Attention Early

Retirement plans for business owners aren't just a savings vehicle — many also reduce your current-year taxable income, sometimes substantially. Waiting until the business is "more established" often means missing years of tax-advantaged compounding that are hard to make up later.

SEP IRA (Simplified Employee Pension)

A SEP IRA is one of the simplest options to set up and maintain, which makes it popular with sole proprietors and small business owners with few or no employees.

  • High contribution limits. You can contribute up to 25% of compensation (or net self-employment earnings, with adjustments), up to an annual dollar cap set by the IRS each year.
  • Employer-only contributions. Only the business contributes — employees don't make their own contributions, which simplifies administration.
  • Flexible year to year. You aren't locked into a fixed contribution amount; you can contribute more in strong years and less (or nothing) in lean ones.
  • Must cover eligible employees equally. If you have employees who meet eligibility requirements, you generally must contribute the same percentage of compensation for them as you do for yourself.

Solo 401(k)

Designed specifically for business owners with no employees (other than a spouse), a Solo 401(k) often allows for higher total contributions than a SEP IRA at the same income level, because it combines two contribution types.

  • Employee contribution. As the "employee," you can contribute up to the standard 401(k) employee deferral limit, with an additional catch-up amount if you're 50 or older.
  • Employer contribution. As the "employer," the business can also contribute up to 25% of compensation, on top of the employee contribution.
  • Roth option. Many Solo 401(k) plans allow Roth contributions, letting you pay tax now in exchange for tax-free withdrawals in retirement.
  • Loan provisions. Some Solo 401(k) plans allow you to borrow against your balance, an option not available with a SEP IRA.

SIMPLE IRA

A SIMPLE IRA fits businesses with a small number of employees who want to offer a retirement benefit without the cost and complexity of a full 401(k) plan.

  • Employee contributions allowed. Unlike a SEP IRA, employees can contribute their own money through payroll deferral.
  • Required employer contribution. The business must either match employee contributions up to 3% of compensation or make a fixed 2% contribution for all eligible employees, whether or not they contribute themselves.
  • Lower contribution limits than a Solo 401(k) or SEP IRA, making it better suited to businesses prioritizing simplicity over maximum contribution room.

Choosing Between Them

  • No employees, want maximum contribution room: a Solo 401(k) usually allows the highest total contributions.
  • No employees, want the simplest possible setup: a SEP IRA requires less ongoing administration.
  • A few employees, want to offer a benefit affordably: a SIMPLE IRA balances cost and employee benefit.
  • Larger, growing team: a traditional 401(k) plan, while more complex and costly to administer, offers the most flexibility in plan design.

The Bottom Line

These plans are among the few tools available to a small business owner that build personal wealth and reduce current tax liability at the same time. The specific rules and contribution limits change periodically and depend on your business structure, so working with a tax professional or financial advisor to set one up correctly is worth the cost — but the decision to start saving shouldn't wait until that conversation happens.

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