When does the 15 months cooling period start from?

The 15-month wait-out period for private property owners (PPOs) who are less than 55 years old and want to buy a resale HDB flat starts from the date of the legal completion of their private property sale. This means that once the sale of your private property is finalized, the 15-month countdown begins, after which you will be eligible to purchase a resale HDB flat.