The appeal of rentvesting is simple: you buy where the numbers work — affordable suburb, strong yields, solid growth — and rent where you want to live. The investment property pays most of the mortgage, negative gearing reduces your tax bill, and you keep the lifestyle flexibility of renting.
The strategy performs best when there is a meaningful gap between the property you can afford to buy and the suburb where you want to live. In Sydney and Melbourne, that gap is often $300,000–$600,000 or more — enough to make a material difference in both cash flow and capital growth.
The key levers are rental yield, capital growth of the investment property, and what you do with any cash flow surplus. Rentvestors who invest their surplus into a share portfolio tend to accumulate wealth faster — the calculator models this explicitly.