The circumstances under which HST is or is not applicable to an assignment depends on the original intention the assignor/seller had in mind when they purchased the unit. If the primary purpose by the assignor/seller in buying from the builder was to profit by assigning/flipping the deal, then HST is applicable.
On the other hand, if an the original buyer originally signed an offer to purchase a condo apartment (to be newly constructed by a builder) with the primary intention that the unit bought would be used (for example) by:
(1) a son or daughter when attending University/College, OR
(2) a parent who wanted or needed a place to reside, or
(3) a spouse who planned to separate from the family, or
(4) the buyer(s) who intended to downsize, or
(5) the buyer(s) who intended to use the apartment when working downtown or when visiting Toronto
(6) a son or daughter who was engaged to be married, or
(7) buyer wanted to move closer to a workplace OR to relocate a place of work
in any of these cases the Canada Revenue Agency would typically conclude that HST is not applicable on the assignment/sale if (at a later date) a reasonable change in circumstance resulted in an assignment/sale of the unit if, for example,
(1) such son/daughter chose not to go to University/College, or
(2) the buyer’s mom or dad no longer could use or wanted to use such apartment as a residence
(due to their death or needs a retirement home), or
(3) intention to separate from family changed, or
(4) decision was made later not to downsize, or
(5) the buyer(s) reasonably changed his/their minds about such intended use, or
(6) the engaged son or daughter decided not to marry or decided to live elsewhere, or
(7) the workplace location changed or the intended relocation of workplace changed
