Retirement Plans for Marketing Agency Owners: Solo 401(k) with a Contractor Model

By Yarik Yarosh, CPA ·September 5, 2026 ·3 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Marketing agency owners who operate with only 1099 subcontractors (freelance designers, copywriters, developers) and no W-2 employees can use the Solo 401(k), the most flexible and generous retirement plan available. This is one of the structural advantages of the all-contractor model: the agency owner keeps the Solo 401(k) while paying freelancers who manage their own retirement savings.

✓Key takeaway

An agency owner with no W-2 employees uses the Solo 401(k): $23,500 deferral plus 25% of net SE income (sole proprietor) or W-2 salary (S-Corp), up to $70,000 combined. A spouse who works in the business can also participate, doubling the household contribution to $140,000. Once the agency hires a W-2 employee (even part-time), the Solo 401(k) is no longer available. The transition to a SIMPLE IRA or Safe Harbor 401(k) reduces the owner’s contribution capacity and adds employer costs. Many agency owners deliberately maintain the all-contractor model partly to preserve the Solo 401(k). The trade-off above the QBI threshold: W-2 employees generate W-2 wages that support the QBI deduction (50% of W-2 wages test), but the Solo 401(k) contribution capacity with the contractor model may offset this. The analysis depends on the agency’s specific income level.

How much can an agency owner contribute?

Hypothetical example

Round numbers. A marketing agency owner (S-Corp) pays $95,000 in W-2 salary. The S-Corp also pays $120,000 to 1099 freelancers. Total agency revenue: $350,000. Net S-Corp profit after salary, freelancers, and expenses: $85,000 (distribution to owner).

Solo 401(k):

Employee deferral: $23,500
Employer contribution: 25% of $95,000 salary = $23,750
Total: $47,250

Tax savings at 24% marginal rate: approximately $11,340.

If the owner hired one freelancer as a W-2 employee ($50,000 salary) and used a Safe Harbor 401(k):

Owner deferral: $23,500
Employer 3% non-elective on owner: $2,850
Employer 3% on employee: $1,500
Owner employer contribution would be limited to the plan’s formula
Additional costs: employer FICA ($3,825), workers’ comp ($1,000), TPA fees ($2,000)
Total additional annual cost: approximately $8,325

The Solo 401(k) with the contractor model avoids the $8,325 in additional costs while providing a comparable contribution level.

Illustrative numbers only, not a real client and not advice for your facts.

What about the spouse in the business?

A spouse who works in the agency (bookkeeping, project management, client communication) is a permitted Solo 401(k) participant. If the spouse earns a W-2 salary of $50,000 from the S-Corp:

Spouse deferral: $23,500
Spouse employer contribution: 25% of $50,000 = $12,500
Spouse total: $36,000

Combined household: owner $47,250 + spouse $36,000 = $83,250. At a 24% rate, the household saves approximately $19,980 in taxes.

The spouse must actually perform services for the business. The salary must be reasonable for the work performed. Paying a spouse $50,000 for occasional bookkeeping would not survive IRS scrutiny. A spouse who manages client projects, handles invoicing, and manages the freelancer network can justify $40,000-$60,000 depending on the market.

Related guides:

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Cite this page

Yarik Yarosh, CPA. "Retirement Plans for Marketing Agency Owners: Solo 401(k) with a Contractor Model." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/marketing-agency-retirement-plans-contractors

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.