Rent vs Buy, the Real Maths
Rent vs buy is one of the most loaded questions in personal finance because the answer depends on inputs people don't usually pin down: how long you'll stay, the growth rate of the city you'd buy in, the rent you're paying, and what you'd do with the saved deposit if you didn't buy. The calculator runs both paths over 5 and 10 years so you can compare net wealth at the end.
This calculator factors in mortgage repayments, ongoing ownership costs (rates, insurance, maintenance), rent growth, opportunity cost on saved deposit if invested, and the tax position on the buy side.
The Two Paths Explained
Path one (buy): take out a loan, pay mortgage repayments, plus rates, insurance, maintenance, and stamp duty. Build equity in the property. Path two (rent + invest): pay rent, no ownership costs, save the deposit and the difference between rent and a hypothetical mortgage, and invest it. Build wealth in financial markets or in an investment property bought elsewhere. Whichever path produces more net wealth at year 5 and year 10 is the answer for that scenario.
When Buying Wins
Buying typically wins when you stay 7 plus years in a market growing at 5 percent or better, transaction costs amortise across the hold, and ownership cost is roughly equal to rent. Sydney over a 20-year hold has historically rewarded buyers because the long-run growth has been strong enough to outweigh the transaction costs.
When Renting Wins
Renting wins when you might move within 5 years (transaction costs eat any growth), the buy market is overheated and likely flat, you'd invest the deposit at higher returns elsewhere, or your buy budget is well below where you actually want to live. The classic rentvest play sits here. See our rentvesting page for the full strategy.
What Most Calculators Get Wrong
Three things. First, they assume you actually invest the rental difference if you rent. In reality, most people spend it. Second, they ignore lifestyle costs (commute, school zones, flexibility) which are real if not financial. Third, they don't model the tax position, where investing through a structure (super, investment property) might outperform shares in a personal name. Run this calculator and the growth projection calculator together for a fuller picture.
Rent vs buy is rarely binary. Many investors settle for rent-where-you-want-to-live, buy-where-the-numbers-work, which is the rentvesting play. Read more at rentvesting. Book a free strategy call for a guided walk-through.