Your Property Grew 17 Percent. You Still Lost Money. Here Is the Maths.

I received a message last week from a follower in Darwin. His investment property had grown 17 percent in the previous twelve months. He wanted to know whether he should sell.

My answer surprised him. Do not sell. Not because Darwin is about to boom further — frankly, I have no idea what Darwin will do next quarter and neither does anyone else. Do not sell because the transaction costs of Australian property are so brutally high that even a 34 percent gain over two years barely survives the journey from paper profit to bank account.

Let me walk you through the arithmetic. This is not theory. These are the actual line items that appear on a vendor's settlement statement.

The real numbers behind a 34 percent gain

Assume you purchased at $500,000. Over two years, the property appreciated 34 percent. Your gross gain is $170,000. Extraordinary by any measure. Now let us subtract the costs that nobody mentions in their celebration videos.

Stamp duty on the original purchase: $24,000 in the Northern Territory for a $500,000 investment property. You paid this upfront, but it is a real cost that must be recovered before you are in profit 1.

Conveyancing and legal fees, twice — once to buy, once to sell: approximately $1,500 each, totalling $3,000 2.

Selling agent commission at 2 percent of the sale price ($670,000): $13,400. Some agents charge more. Very few charge less in regional markets 3.

Renovation, staging, and advertising to achieve that sale price: conservatively $5,000. If you needed a fresh coat of paint and professional photography, add another $2,000-$3,000.

So far, your $170,000 gross gain has been reduced to approximately $125,000.

Now comes capital gains tax. You held for more than twelve months, so you receive the 50 percent CGT discount. Your taxable capital gain is $62,500. At a marginal tax rate of 35 percent — typical for someone earning enough to invest in property — you owe $21,875 in additional income tax 4.

Final cash in your hand: approximately $103,000.

You thought you made $170,000. You actually netted $103,000. That is a 39 percent haircut, and it assumes everything went perfectly — no extended vacancy during the sale campaign, no price reduction, no building inspection surprise that required remediation before settlement.

If you used a buyer's agent on the purchase side as well, subtract another $15,000-$20,000.

The compounding cost of buying and selling three times versus once

Here is where the comparison becomes devastating for the flip-and-repeat strategy.

Consider two investors, each starting with the same capital. Investor A buys in hot regional markets — Darwin, Perth, Tasmania — chasing 15-20 percent annual growth. Over a ten-year period, they buy and sell three times, attempting to ride each boom and exit before each correction.

Investor B buys in a major capital city — Melbourne, Sydney, or Brisbane — and holds for the full decade. They refinance against equity growth to fund subsequent purchases, never selling.

Investor A pays stamp duty three times. They pay selling agent commissions three times. They pay conveyancing fees six times (three buys, three sells). They trigger capital gains tax three times. They experience vacancy periods of three to six months with each sale-and-repurchase cycle — call it nine to eighteen months of lost rental income across the decade 5.

Investor B pays stamp duty once per property. They never pay selling commission. They never trigger CGT during the holding period. They refinance — a process that costs approximately $500 in valuation fees and zero in tax — and deploy the extracted equity into additional properties 6.

After ten years, Investor A has paid roughly $150,000 in cumulative transaction costs and lost $80,000-$160,000 in vacancy. Investor B has paid perhaps $30,000 in total transaction costs and experienced minimal vacancy because they never disrupted their tenancies.

The paper returns might look similar. The after-cost returns are not even close.

Why regional boom-bust markets are particularly dangerous

Darwin, Perth, and Tasmania share a historical pattern that property commentators conveniently forget during upswings. These markets experience sharp, sentiment-driven booms — 15 to 25 percent annual growth — followed by equally sharp corrections that give back most or all of the gains 7.

Darwin's median house price peaked at approximately $580,000 in 2014, crashed to $420,000 by 2019, and has since recovered to around $500,000. An investor who bought at the 2014 peak and held through the cycle is essentially flat after a decade. An investor who bought in 2019 and is now celebrating a 17 percent annual gain is looking at a market that has merely recovered to its previous peak — not broken new ground 8.

Perth followed an almost identical trajectory: peak in 2014, trough in 2019-2020, recovery through 2024. The investors who made money in Perth bought in 2019, not 2014. But the investors buying in Perth today, at or near the previous peak, are running the same risk the 2014 buyers faced.

Melbourne and Sydney do not exhibit this pattern. Their corrections are shallower (10-15 percent) and their recoveries are faster, driven by diversified economies, higher population growth, and deeper pools of owner-occupier demand. The boring, steady 5-7 percent annual growth in these markets compounds more reliably than the thrilling but volatile 15-20 percent swings in resource-dependent economies 9.

I say this as an actuary by training: the variance of returns matters as much as the mean. A market that delivers 7 percent consistently beats a market that delivers 20 percent one year and negative 10 percent the next, once you factor in the transaction costs triggered by each buy-sell cycle.

The refinance alternative that nobody talks about

Here is what sophisticated investors actually do. They buy a property at $650,000 on a 600-square-metre block in Melbourne's southeast. They spend $13,000 on a light cosmetic renovation — new flooring, fresh paint, a partition wall that creates a second living space. The property's rental income jumps from $500 per week to $850 per week 10.

Six months later, they request a bank revaluation. The combination of improved rental income, comparable sales data, and the physical improvements pushes the valuation to $750,000 or higher. They refinance at 80 percent loan-to-value ratio, extracting $50,000-$80,000 in equity — tax-free, because refinancing is not a taxable event 11.

That extracted equity becomes the deposit for property number two. The process repeats. No stamp duty on a sale. No agent commission. No CGT. No vacancy.

This is why I tell every client the same thing: the most important metric in property investment is not the growth rate. It is the holding period. Time in the market will always beat timing the market, but only if you structure your portfolio to avoid the friction costs that erode returns.

I am an actuary. The most important thing in investment is not timing. It is time.