hi doll, when u take up a flat from HDB direct(eg, walk in selection, ballot), the price quoted already includes the grant. HDB will just tell u that the price of a new flat is already subsidzed. So if u bought the flat at say 300k from HDB directly, u will surrender at 85% of 300k. I m not sure how they calculate the interest, etc. The grant is only specified when u bought a resale, I think.
"The resale levy will only be charged to the party that has profited from an HDB sales." ... As for this, say if ur next flat is 300k and HDB charge u for the levy, if u cannot pay the levy urself, then ur next partner will have to bear part of it as well... that is my guess