If you are from an SC/SPR household, you can apply for the Citizen Top-Up when your SPR family member takes up Singapore Citizenship or when you have a SC child.
You are liable to pay a resale levy of $55,000 when you sell the EC bought with the CPF Housing Grant after complying with the minimum occupation period, and, after meeting a 30-month waiting period, buy a second subsidised flat from HDB or take over ownership of a subsidised HDB flat or buy an Executive Condominium (EC) from a developer where the land sale was launched on or after 9 Dec 2013, including those where tenders were not closed, i.e. Westwood Avenue, Canberra Drive and Anchorvale Crescent.
If you do not intend to buy a second subsidised flat from HDB, for instance, if you are buying a resale flat, a new DBSS flat, an Executive Condominium (EC) from a developer where land sale was launched before 9 Dec 2013 or a private residential property, you need not pay the resale levy.