How to start a digital marketing agency 401k

A 401(k) for your agency starts with choosing between a traditional Solo 401(k) (if you're self-employed or have only a spouse as an employee) or a standard 401(k) plan if you have multiple employees. For most growing agencies, a Solo 401(k) is the entry point—it's designed specifically for self-employed people and small business owners, costs less to set up than a full 401(k), and lets you contribute as both employer and employee. You'll set this up through a plan provider like Fidelity, Charles Schwab, E*TRADE, or Vanguard. The process takes about an hour online, and you'll choose your investments from their available options. You don't need to file any special paperwork with the IRS to establish one, though you will report it when you file your business tax return. The deadline to open a Solo 401(k) is December 31st of the tax year you want it active, so timing matters if you're planning for 2024.

Once you have employees beyond yourself, you'll need to transition to a standard 401(k) plan. This becomes more complex because you'll need to handle compliance testing, make employer contributions, and file annual forms with the IRS. Many agencies outsource this to a plan administrator who handles the compliance requirements—this costs around $1,500 to $3,000 annually depending on the number of employees. At this growth stage, some agencies use PEO (Professional Employer Organization) services like Guidepoint or ADP, which bundle 401(k) administration with payroll and HR compliance for a flat fee per employee.

Contribution limits for 2024 are $23,500 if you're under 50, plus you can add employer contributions. As a business owner, you can contribute up to 25% of your net self-employment income as an employer contribution to your own Solo 401(k), which creates significant tax savings. The real benefit of starting early is tax deferral—every dollar you put in reduces your taxable business income. Keep documentation clean from day one, especially once you have employees, because the IRS actively audits 401(k) plans for compliance violations. If you're uncertain about compliance requirements, a CPA or tax advisor who works with agencies can review your plan annually and help you avoid costly mistakes.