The Assumptions

• Price: $700,000 per property
• Deposit and costs: 10% deposit ($70,000) plus 5% purchase costs ($35,000), so $105,000 cash per property
• Loan: 90% of the price, interest-only, so the debt never falls. That is $630,000 per $700,000 property
• Capital growth: 6% a year
• Rent: 4% of the purchase price in the first year, growing 4% a year
• Running costs: $6,000 a year per property, held flat. This covers rates, insurance, and management
• Interest rate: 5.5%
• Not included: tax, selling costs, lenders mortgage insurance, and vacancy

Buying timeline:

• One property: bought in year one
• Three properties: two in year one and the third a year later. The third costs about $742,000, because prices have risen
• Five properties: two in year one, then one a year for three years. Total purchase price is about $3.76 million, with about $3.39 million of debt and about $564,000 of cash needed over four years

Buying sooner generally helps, because you have more time in the market and later purchases cost more. In this model a property bought in year four costs about $834,000 instead of $700,000.

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What the Numbers Show

This table shows the net gain at each point. It is equity (value minus loans), less the cash you put in at purchase, plus or minus the cumulative cash flow along the way.

After 10 years, the portfolios are worth about $1.25 million, $3.76 million, and $6.27 million. After 30 years, they are worth about $4.02 million, $12.06 million, and $20.10 million.

Two patterns stand out:

1. Compounding is slow, then fast. Very little seems to happen in the first ten years, and then the gap between the paths widens. By year 30, three properties produce about three times the net gain of one, and five produce about five times.
2. The debt shrinks without being paid down. The loans stay the same size, but values rise, so the loan-to-value ratio falls from 90% to about 16% by year 30.

These gains are before tax and selling costs. They are also on paper, so you can only use them by selling or borrowing against them.

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Cash Flow: The Part That Takes Years

The gains come with holding costs. Under these assumptions each property starts at a shortfall because the interest is larger than the rent.

• One property: about $12,650 a year short at the start, turning positive in year 11, and about $46,700 a year by year 30
• Three properties: a peak shortfall of about $36,100 a year, turning positive in year 11, and about $139,600 a year by year 30
• Five properties: a peak shortfall of about $55,100 a year, turning positive in year 12, and about $230,600 a year by year 30

By year 30 the rent has outgrown the interest, because the loan stays flat while the rent rises 4% a year. A larger portfolio then gives you choices. For example, you could sell one property and use the proceeds to pay down debt on the others, though that triggers selling costs and capital gains tax.

The early years are what limit most people. Five properties need about $352,000 of cash over the early years, on top of the deposits, before the portfolio pays for itself.

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A Tougher Case

The assumptions above are favourable. The interest rate is lower than most loans today, and running costs stay flat for 30 years. Here is what happens with 3% growth, a 6.5% interest rate, and running costs rising 3% a year.

The holding costs are much heavier in this case.

• Peak annual shortfalls: about $18,950 for one property, $55,500 for three, and $89,400 for five
• Cash flow turns positive: in year 16, year 17, and year 18
• Most cash needed over the early years: about $165,000, $500,000, and $850,000

The strategy still produces gains over 30 years, though much smaller. After ten years, five properties have a net gain of only $220,000. National prices are currently down 2.7% from their March 2026 peak, so this case is worth taking seriously.

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What the Model Leaves Out

Tax. For established residential properties bought after 12 May 2026, losses carry forward against future property income instead of offsetting your wages. New builds keep full negative gearing. From 1 July 2027, the CGT discount is replaced with indexation and a 30% minimum tax on real gains.

Lenders mortgage insurance. At 90% loan-to-value, LMI applies, and the model does not include it.

Borrowing capacity. Lenders assess you at a rate 3 percentage points above your actual loan rate. Five properties at 90% means about $3.4 million of debt, which very few borrowers can obtain. 

Interest-only limits. The model assumes interest-only repayments for 30 years. Interest-only terms are usually limited to a set period, after which repayments can rise.

Yields. Rent grows 4% a year and values grow 6%, so the yield falls over time.

Vacancy and repairs. Real properties have vacancies and unexpected costs.

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Spreading the Portfolio

Many investors spread a larger portfolio across states and property types. Each state has its own rules, including stamp duty and land tax, and those rules can change. Properties in neighbouring suburbs also behave more like one property than several.

Spreading takes more research and local knowledge, which is where a buyers agent or other adviser helps. Check out our blog on property diversification for more information.

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Questions to Ask Before You Choose

1. What can you borrow? Get a formal assessment, because it decides how many properties are possible.
2. Can you carry the peak shortfall? The figures above show how much cash each path needs before it turns positive.
3. Do you hold a buffer? Three to six months of repayments across all your properties is a common starting point.
4. Are the properties in supply-constrained markets with real demand drivers? Our cash flow blog shows how to test the numbers.
5. How long can you hold? The results depend on holding for decades.

Many investors start with one property and add more once they have seen how holding costs and the market behave.

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Ready to Work Out How Many Properties Fit Your Plan?

At Search Property, we help Australians cut through the noise and build data-driven investment strategies aligned with long-term wealth goals. Our buyers agents have helped thousands of clients build wealth through property because we focus on fundamentals, not headlines.

Book a FREE investment assessment call with Search Property.

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