If you are paying the premium for a policy for which premium is overdue or due for payment till June 30, 2017, then GST will not be applicable to you.
If your policy premium is due for payment on or after July 1, 2017, which is the proposed implementation date for GST, then GST will be applicable on your premium. In case you pay the premium in advance, the balance amount due if any, on account of GST will have to be paid after the GST implementation date.