Calls On Contributories:

                                      Every person who is a member of the company at the commencement of winding up and every past member is in principle liable to contribute to the company's assets whatever may be required to enable it to pay its debts in full.  Present and past members are therefore called "contributories". This serves to give present and past members the status of contributories with, for example, the right to petition for compulsory winding up. But if the company is limited by shares and its issued shares are fully paid the contributories have not liability to contribute anything in normal circumstances.

 A contributory may be liable to contribute in the following circumstances:

(a) if the shares which he holds or previously held are partly paid or if it is found that the rules on consideration have been breached in the allotment of shares as fully paid'

(b) if the company is limited by guarantee;

(c) if the company is unlimited.

As explained below the persons who are members at the time when liquidation commences are primarily liable (when there is any liability).  The liability of past members is very restricted.