Rental turnover costs are a serious challenge for property managers and brokers, especially when the turnover rate is high. According to the National Apartment Association, the average tenant turnover rate is around 40%. So that means if you’re managing 200 units, then 80 units will turnover each year. Those add up, meaning you’ll be turning 6-7 units every month. And the cost of each of those 80 turnovers chips away at the bottom line of your rental income.