Retirement Savings for 1099 Contractors: SEP IRA vs. Solo 401(k)

7 min read · Updated July 2026

One of the quieter costs of moving from W-2 employment to 1099 contracting is losing access to an employer-sponsored 401(k), often with a matching contribution that was effectively free money. The good news is that self-employed workers have their own set of retirement account options — some of which allow considerably higher contribution limits than a typical employee 401(k).

SEP IRA: The Simplest Option to Set Up

A Simplified Employee Pension (SEP) IRA is popular among self-employed contractors specifically because it's straightforward to open and administer, with contributions calculated as a percentage of net self-employment income, up to an annual dollar limit that adjusts each year. There's no separate employee-vs-employer contribution split to track since you're both, in this context — you simply contribute up to the allowed percentage of your net earnings.

Solo 401(k): Often the Higher-Contribution Option

A Solo 401(k) (also called an individual 401(k)) is available to self-employed individuals with no employees other than a spouse. It allows contributions in two capacities — as the "employee" (an elective deferral, similar to a regular 401(k)) and as the "employer" (a profit-sharing-style contribution based on business income) — which combined often allows a meaningfully higher total contribution than a SEP IRA at the same income level, particularly for contractors with moderate net income. It also typically requires slightly more administrative upkeep, including a required annual filing once account assets cross a certain threshold.

SEP IRA vs. Solo 401(k): A Side-by-Side View

Traditional or Roth IRA as a Simpler Starting Point

For contractors just starting out, or those wanting a lower-maintenance option before their income justifies a SEP or Solo 401(k), a standard Traditional or Roth IRA remains available, subject to the same annual contribution limits and income eligibility rules that apply to any individual, self-employed or not. The contribution ceiling is considerably lower than the self-employed-specific plans, but the simplicity can make sense for irregular or lower freelance income.

Why This Matters More for Contractors Than It Might Seem

Beyond the long-term retirement benefit, contributions to these plans reduce current taxable income, which lowers your ordinary income tax bill for the year — though notably, retirement plan contributions do not reduce the self-employment tax calculated on your net earnings, since that calculation happens on a different base. Understanding this distinction matters when estimating your quarterly tax payments, since a retirement contribution helps your income tax bill but not your self-employment tax bill.

Choosing Based on Your Income Pattern

• Irregular, lower freelance income: A Traditional or Roth IRA offers simplicity without the administrative overhead of the self-employed-specific plans.
• Steady, moderate-to-high freelance income: A SEP IRA offers a straightforward way to shelter a meaningful percentage of net earnings.
• Higher freelance income where maximizing contributions matters most: A Solo 401(k) often allows the highest total contribution due to its dual employee/employer structure.

Frequently Asked Questions

This article is educational only and not financial or tax advice. Contribution limits and rules change; consult a licensed financial advisor or CPA before opening or funding a retirement account.