Retirement Plans for Self-Employed Business Owners Compared

Choosing the right retirement plan for self-employed business owners is one of the highest-leverage tax decisions you'll make. The right plan shelters income from taxes now, grows tax-free (or tax-deferred), and can save you $20,000 to $300,000+ per year depending on your income and age. The wrong plan leaves money on the table. Here's a side-by-side comparison of every option available to you.

The Five Retirement Plans for Self-Employed Owners

Each plan has different contribution limits, administrative requirements, and ideal use cases. The right choice depends on your income level, age, whether you have employees, and how much you want to contribute.

Side-by-Side Comparison

SEP IRA: Simple and Effective

The SEP IRA is the easiest retirement plan to set up and maintain. There's no annual filing requirement, no plan document to maintain, and contributions are entirely flexible year to year. You can contribute up to 25% of net self-employment income, maxing out at $69,000 for 2026.

The downside: there's no employee deferral component (contributions are employer-only), no Roth option, and no catch-up provision. If you have employees, you must contribute the same percentage for them as you do for yourself — which can get expensive quickly.

Solo 401(k): Maximum Flexibility

The Solo 401(k) — also called an individual 401(k) — is the most versatile option for self-employed owners without employees (other than a spouse). You make contributions in two roles: as the employee ($23,500 deferral, plus $7,500 catch-up if 50+) and as the employer (25% of compensation).

This dual contribution structure means you can often shelter more income at lower earnings levels compared to a SEP IRA. A business owner netting $100K can contribute roughly $43,500 through a Solo 401(k) versus about $25,000 through a SEP.

Additional advantages include a Roth option (contribute after-tax dollars that grow tax-free), loan provisions (borrow up to $50K from your own plan), and the ability to accept rollovers from other retirement accounts.

SIMPLE IRA: Built for Small Teams

If you have employees, the SIMPLE IRA is a straightforward way to offer retirement benefits without the administrative burden of a full 401(k) plan. Employees contribute up to $16,500 (2026), and the employer matches up to 3% of compensation or makes a flat 2% contribution for all eligible employees.

The contribution limits are lower than SEP or Solo 401(k), making this a weaker choice for high-income owners. But for businesses with a small team where you want to provide a benefit without hiring a plan administrator, the SIMPLE IRA fills a clear niche.

Defined Benefit Plan: The High-Earner Powerhouse

For business owners earning $400K+ — especially those aged 45 or older — a defined benefit plan is the most powerful tax shelter available. Annual contributions can reach $200,000 to $350,000 or more, depending on your age and income.

Unlike defined contribution plans (SEP, 401(k)), where the contribution limit is fixed, a defined benefit plan's limit is based on the retirement benefit you're funding toward. The closer you are to retirement age, the more you can contribute annually to reach that target — which is why these plans are especially powerful for owners in their late 40s, 50s, and 60s.

The tradeoff: defined benefit plans require an actuary to design and maintain, annual filings (Form 5500), and a commitment to fund the plan each year. They're not casual — but for the right owner, the tax savings dwarf the administrative costs.

Cash Balance Plan: The Hybrid Approach

A cash balance plan is a type of defined benefit plan that looks and feels like a defined contribution plan. Each participant has a notional "account balance" that grows by a guaranteed annual credit rate. But because it's legally a defined benefit plan, the contribution limits follow the same generous actuarial formulas.

Many high-income owners stack a cash balance plan on top of a 401(k) — contributing $69K through the 401(k) and another $150K–$300K+ through the cash balance plan. This combination can shelter $200K–$400K+ per year from taxes.

Which Plan Should You Choose?

The decision tree is simpler than it looks:

• Solo, earning under $150K, want simplicity: SEP IRA
• Solo, earning under $300K, want flexibility: Solo 401(k)
• Have employees, want a basic benefit: SIMPLE IRA
• Earning $400K+, age 45+, want maximum shelter: Defined benefit plan
• Earning $500K+, want the absolute maximum deduction: 401(k) + cash balance plan combo

The right plan can also be combined with other strategies — like an S-Corp election to reduce self-employment tax on the income that doesn't go into the retirement plan.