Evaluating the real contribution of every partner is also subjective. Partner A may do all the work but Partner B, for example, has such good contacts in the industry that, alone, Partner B can catapult the company from 0 to 6-0 in no time at all. Years ago I had a lazy partner that had the gift of being able to get through the front door of a potential client, without a referral, without an appointment, knowing nobody inside and getting out with a signed contract. He had 50% of the company, worked a full 8 hours... per week, and was the best partner I have ever had. Besides, you can compensate the difference in work participation with salary, bonuses... and keep the partnership intact.