invoice date and tax liability

Somen Dutta (Asst. Accountant) (43 Points)

14 December 2017  
we r doing manpower supply, like security guard, housekeeping etc to various organization. after completion of month we raised invoice very next day. for example November'17 service provide and invoice raised 1st December 2017 , also invoice date 1st December'17.
Now my question is what is the my tax liability month and what is the payment due date of tax?