credit note by real estate developers

Can adjust..

But credit note can be raised i) before 30th Sep'19 for invoices pertaining to FY 18-19 and ii)before 31st Mar'19 for FY 17-18

Logically if flat is booked prior to FY 18-19/17-18, credit note cannot be raised to that extent of prior period..

But practically it may not be possible as flat can be cancelled at any point of time..

If possible we may try to tell the customer that GST amount is not refundable..