This is not correct. Perhaps this person were talking specifically about [broken link removed] where first time buyers get preferential relief for seven years compared to non first time buyers? In general (e.g. when it comes to stamp duty etc.) it is not true to say that one's FTB status is retained for seven years even if houses are bought/sold during that period. This shows why it's a good reason to get a second opinion, and preferably an independent/professional one (not mine - I'm just an amateur punter), on issues such as this.