I would like to know about this too. Said u plan to ROM as what it was stated on the Date of completion date. However the project was ahead for a year. Are we going to ROM a year advance too?
HDB InfoWEB: Additional Info on FS : Buying A New Flat
Submission of Marriage Certificate
If you are applying for the Additional CPF Housing Grant (AHG), you must submit a copy of your marriagecertificate to the HDB on or before the date you take possession of the flat as the Housing Grant is meant for married couples.
If you have solemnised your marriage before you collect the keys to your flat, you will have to submit a copy of your marriage certificate to our Sales Office.
If you are not applying for the AHG and you have booked a flat that is completed, you must produce your marriage certificate within three months after you have taken possession of the new flat.
If you are not applying for the AHG and you have booked a flat that is under construction, you must produce your marriage certificate at the estimated Delivery Possession Date of the flat or within three months after you have taken possession of the new flat, whichever is later.
If you solemnise your marriage after you have taken possession of the new flat, you will have to submit a copy of your marriage certificate to the HDB Branch Office managing the lease of your flat.
It depends on ur situation and which category u fall in...