The MOP is computed from the date of purchase of the flat if the SC flat owners who sublet the flat are the original purchasers. If there was a resale of part-share or transfer of flat ownership, the MOP is computed from the effective date of the resale of part-share/transfer of flat ownership, or the date the owner was included as an authorised occupier of the flat.　

　刚刚从HDB网站上抄的，还是我理解错了，其实从occupier开始就已经算mop，不需要重算了？