Generally it is a pre condition for shareholder that until he paid the total amount of shares he has no right to get bonus from the company. Then the company firstly collect the partly paid shares then issued fully paid bonus shares to shareholders.
26 October 2012
The basic reason being that bonus shares are issued by capitalizing free reserves. Bonus shares being fully paid up shares warrants that it should be issued to such shareholders only holding fully paid up shares as on closure date.