An example
For a 58-year-old former executive who sits on three corporate boards, the 2026 figures work out like this:
- Cash balance plan, first year
- $282,000
- Solo 401(k) alongside
- $32,000
- Both plans
- $314,000
- A Solo 401(k) on its own
- $80,000
- Federal income tax saved
- $39,300
Federal income tax only, compared with making no retirement contributions. State tax saved depends on where you live: see savings by state. An illustration from the same calculation as the estimate, not a quote.
Corporate directors are generally sometimes a specified service business for the 20% qualified business income deduction, depending on what exactly the work is. That changes how much a contribution saves at higher incomes. How the deduction interacts with contributions
Director fees are business income
IRS Publication 525 says corporate director fees are self-employment income, reported on Schedule C. That makes you a sole proprietor for this income, whether or not you think of board work as a business, and a sole proprietor can sponsor a retirement plan. See sole proprietors and single-member LLCs.
Retainers, meeting fees and committee chair fees paid in cash all fall under this. Fees paid in stock, or deferred under a company's plan for directors, raise timing questions about which year's earnings they belong to. Confirm those with your tax adviser before relying on them to support a contribution.
Board retainers are usually paid on a set schedule, which makes the income more predictable than most self-employment income and suits a plan that asks for a minimum contribution every year. The risk is a seat ending, through a sale of the company, a merger or a term limit. With several boards, losing one leaves the others; with one, it can remove most of the income that supports the plan. See minimum contributions and lean years.
Directors often start board work later in their careers, which suits the way a cash balance plan works: the closer you are to retirement age, the more the plan allows each year. See the limit at each age.
Directors with a day job
An executive who sits on one or two outside boards has two kinds of income. The salary from the employer belongs to that employer's plans. The board fees support a plan in your own business. The two sets of plans are separate, except that 401(k) deferrals share one per-person limit across both. See a W-2 job and a side business.
Board seats and the related-employer rules
A one-person plan needs a business that is not treated as part of a larger employer with employees. Sitting on a company's board does not by itself make you one employer with it. Ownership can.
- Owning 80% or more of a company with employees, counting family ownership, brings its employees into your count under the controlled group rules. On a private or family company's board, check your stake.
- A spouse's company. Your spouse's ownership of a business is normally not attributed to you if you have no role in it. Serving as a director or officer of it is one of the roles that ends that exception, so its employees can then count as yours.
Board fees and the QBI deduction
Board service is not named on the specified service list, and the regulations do not address it directly. Some advisers treat it as consulting, because a director gives advice and counsel; others do not. That is why this page shows the answer as depending on the facts. How the deduction interacts with a contribution is covered in the QBI deduction and retirement contributions.