Service accounting code in gst

GST charged at 18%

GST NIL rate

We manage 3-4 apartments for the owners, We give it on rent for short stays of 1, 2 days to 1 month and more. What will be the applicable GST rate?

Owner wants us to collect all the amount in our company and he lets us keep 20% of amount collected and remaning we need to send to him from our bank account.

Will the GST rate be on the total amount we recieve for the occupancy from short stay tenenats 

or

Will the GST rate be on the amount Owner let us retain ?

GST at 18% rate to be charged on the total amount you recieve for the occupancy from short stay tenenats.