"Employers can claim for regular payments they are obliged to pay their employees. This includes compulsory commission, as well as fees and past overtime. However, discretionary commission should be excluded, as well as discretionary bonuses (including tips) and non-cash payments."
A company has three salesmen who get paid commissions on their sales. Is that a "compulsory commission" ? The commissions are substantial - in excess of their regular salaries in two cases. I thought no, but now I'm not so certain.