While I understand your frustration, we would absolutely set this plan up as a 401(k), only because there is no extra cost in our operation to do so and there might be a year where his income drops significantly so the ability to defer up to the max instead of treating it as a employer contribution and the limits attached to that might be helpful. That is the essence of flexibility of design that organizations that know what they are doing bring to the game. I agree if there was a significant "upcharge" for such a plan that it becomes questionable, but I find it hard to justify any additional cost for a one man 401(k) where the individual defers. It's even easier if the entity is not incorporated because then we can split the contribution (made during the year) any way we want (as employer contribution or 401(k) deferral) that best meets the client needs. We do this all the time.