Retirement Plans for Staffing Agency Owners: W-2 Wages, QBI, and Employee Obligations
Staffing agencies have a structural feature that makes retirement planning different from most businesses: they employ dozens or hundreds of workers on W-2 payroll, placing them at client sites. These workers are the staffing agency’s employees, and any retirement plan the agency offers must include them (subject to eligibility requirements). This creates a tension: the owner wants to maximize their own retirement contributions, but every plan that allows high owner contributions also requires employer contributions for the placed workers.
A staffing agency owner cannot use the Solo 401(k) (too many employees). The main options are SEP IRA (uniform percentage for everyone, including the owner and every eligible placed worker), SIMPLE IRA (lower deferral cap but lower employer cost through the match structure), and Safe Harbor 401(k) with eligibility restrictions (the most common choice for agencies). The key tool is the eligibility requirement: setting a 1-year, 1,000-hour service requirement excludes placed workers who leave within their first year. In the staffing industry, where turnover is high (often 100%+ annual turnover for temporary workers), the eligibility filter dramatically reduces the number of employees who ever qualify for the plan. A cross-tested or new comparability plan can also allocate a higher percentage to the owner than to eligible workers, but requires annual nondiscrimination testing and actuarial fees. Staffing agencies are not SSTBs, so the QBI deduction is fully available, and the large W-2 payroll means the 50% of W-2 wages limitation on QBI is rarely binding.
How does turnover affect the plan cost?
What about the SEP IRA?
The SEP IRA requires a uniform percentage contribution for all eligible employees. Eligibility is more restrictive than the 401(k): the employer can require employees to have worked in at least 3 of the last 5 years, be at least 21 years old, and have earned at least $750 in the current year. The 3-of-5-year requirement is powerful for staffing agencies with high turnover: very few temp workers stay long enough to qualify.
However, the SEP IRA is employer-contribution-only (no employee deferrals). The owner’s contribution is limited to 25% of compensation, and every eligible employee receives the same percentage. If the owner contributes 25%, every eligible placed worker also receives 25%.
For a staffing agency owner earning $150,000 in W-2 salary who wants to defer $37,500 (25%), the cost for 12 eligible workers at $35,000 each would be: 12 x ($35,000 x 25%) = $105,000. That is prohibitively expensive.
In practice, the owner would reduce the contribution percentage to something affordable (5-10%), which limits the owner’s own contribution. The Safe Harbor 401(k) is almost always better because the owner’s employee deferral ($24,500) does not require any employer match for the placed workers.
What about a new comparability plan?
A new comparability (cross-tested) plan allows different contribution rates for different groups of employees, as long as the plan passes nondiscrimination testing. The owner could receive a 15-25% employer contribution while eligible placed workers receive 5%. The testing ensures that the plan provides comparable benefits across employee groups on an actuarial basis.
This structure works well when the owner is significantly older than the placed workers (the age-weighted testing gives older participants a higher allocation), and when the number of eligible employees is small (fewer employees to test against). The downside is the annual administration cost ($3,000-$5,000 for actuarial testing and TPA fees).
Related guides:
- Staffing Agency Entity Structure Scorp
- Staffing Agency Franchise Tax Model
- Staffing Agency Multistate Compliance
- Staffing Agency Tax Deductions Payroll
- Staffing Agency Workers Comp Insurance Deductions
When must a staffing agency deposit placed workers’ 401(k) money?
Deferrals withheld from placed workers’ paychecks become plan assets as soon as they can reasonably be separated from agency funds. The outer limit is the 15th business day of the following month. The 7-business-day safe harbor covers only plans with fewer than 100 participants, which a big staffing payroll may outgrow.
The employer side runs on the agency’s return. Profit-sharing, SEP and new comparability contributions for 2025 are due by the return due date with extensions. For an S corporation that return is due March 16, 2026, or later if extended with Form 7004. A new 401(k) or profit-sharing plan can also be adopted after year-end, up to that extended date, for employer contributions.
- Anyone 50 or older whose 2025 wages from the agency topped $150,000 has to make 2026 401(k) catch-ups as Roth. The rule doesn’t apply to SEP or SIMPLE IRAs.
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Yarik Yarosh, CPA. "Retirement Plans for Staffing Agency Owners: W-2 Wages, QBI, and Employee Obligations." Blue Cloud CPA, September 5, 2026, updated September 23, 2026. https://bluecloudcpa.com/guides/staffing-agency-retirement-plans
This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.