Via CoreLogic:
Over the 12 months to June 2017, 3,861 dwellings were sold after having been held for less than a year nationally with a further 16,749 resold after being owned for between one and two years. These figures represented 1.3% and 5.7% of all resold property sales over the year. Flipping remains a small proportion of the overall housing market however, flips between one and two years have been trending higher over recent times. In its heyday in the early 2000s, 4.4% of all properties were flipped in less than 12 months and 16% were flipped between 12 and 24 months from previous purchase.
What is surprising is that the introduction of the capital gains tax discount for investors that held properties for more than 12 months in 1999, made little difference to flipping behaviour. In fact, the incidence of flipping didn’t rise substantially until the national housing market boomed between 2001 and 2004.