Gst applicability on 90% compled flat - in gujarat

1. AN APARTMENT IS 90% CONSTRUCTED , AND PAID 90% OF VALUE AGAINST BANK LOAN, & OWER MRGIN
2. FINAL SALE DEED IS PENDING BECAUSE OF BU PERMISSION (CORPORATION), AND LIKELY TO COME IN JULY, AFTER WHICH FINAL SALE DEED SHALL BE DONE.
3. WHETHER GST ON FULL VALUE OF SALE DEED WILL BE APPLICABLE ON  SALE DEED EXECUTION ON JULY ? OR ONLY ON THE FINAL 10% VALUE PAYABLE IN JULY , 

NITIN SHAH