How to calculate salary in case of gratuity payment

thanks for your reply can you please tell me how to know that or i mean how to know that which company comes under covered under payment of gratuity act

Thanks

If covered under gratuity act- 10 months immediately preceeding the DATE of retirement.

If not under Gratuity Act- 10 months immediately preceeding the MONTH of retirement.

I have two question

1) how to know that it comes under gratuity act or not

2) if under gratuity act (current salary or 10 months immediately preceeding the DATE of retirement)

or if not under gratuity act ( average of 10 months from month of retirement)

Please clear my doubts

HI all, GM, in my organisation, in salary payment, grade pay is also paid as per pay scale (Grade pay+pay+DA+HRA+OA). Should we add this grade pay amount while calculating basic pay for gratuity workings. Because for calculating DA & HRA basic pay is arrived by adding Grade pay and Pay. Request to clear my doubt.