No wages, no plan contributions.
You should be careful to be very precise in discussing this topic with clients, advisors, CPAs and prospects. If S-corp shareholders received "profit distributions", then they did receive "income" from the corporation. What they apparently did not receive from the corporation were "wages" for employment. Wages are the basis of plan compensation. Using imprecise language like "income" leads to these situations. I get proposal requests all the time, telling me a prospect has tons of "income". But that income may or may not be plan compensation. Usually a good chunk of it is in fact NOT plan compensation. Sometimes it is gross revenue, sometimes it is their 1040 adjusted gross income, sometimes it is a WAG. I always ask for the entity type and how it is electing to be taxed. Then I can ask specific questions to get to a plan compensation figure to use.