Dear Sachin,
The principle of set on and set off of allocable surplus is-
Where for any year the alllocable suplus exceeds the amount of max bonus payable to the employees then, the excess shall subject to the limit of twenty per cent of the total salary or wages of the employees, be carried forward for being set on in the succeeding year and so on to be utilised for the purpose of payment of bonus where for any year there is no available suplus, or the allocable suplus in respect of that year falls short of the amount of minimum bonus payable to the employees, and there is no amount or sufficient amount carried forward and set on which could be utilised for the purpose of payment of the minimum bonus then, such minimum amount or the deficiency shall be carried forward for being set off in the succeeding year and so on.
Regards,
Brijesh