---
title: "Why Paying Cash for Investment Property Is the Most Expensive Mistake You Can Make"
description: "With $1M cash you can buy one property growing at 2% or five properties growing at 10% combined. Leverage is the mathematical reason property outperforms every other asset class in Australia."
author: Joey Don
date: 2023-06-15
category: Market Analysis
url: https://premiumrea.com.au/blog/leverage-mortgage-multiplier-australian-property-returns
tags: ["leverage", "mortgage", "good debt", "bad debt", "return on equity", "property investment", "Rich Dad Poor Dad", "cash flow"]
---

# Why Paying Cash for Investment Property Is the Most Expensive Mistake You Can Make

*By Joey Don, Co-Founder & CEO at PremiumRea — 2023-06-15*

> I have clients who can afford to pay cash for investment property. And I talk every single one of them out of it. Not because borrowing is fun. Because the maths makes paying cash genuinely irrational once you understand how leverage multiplies returns in Australian property.

"I have the cash. Why would I pay interest to a bank?"

I hear this from clients at least once a month. Usually from Chinese-Australian professionals who've saved diligently, invested conservatively, and accumulated $800K-$1.5M in cash or liquid assets. They've worked incredibly hard for that money, and the idea of voluntarily taking on debt to buy something they could afford outright feels wrong.

I get it. I genuinely do. In China, mortgage debt is a burden. You borrow because you have to, and you pay it down as fast as possible because the rental yields are too low to cover the interest, let alone the principal. Chinese property is pure capital appreciation play with negative cash flow. Borrowing is necessary evil, not strategic advantage.

But Australia isn't China. And the difference isn't cultural — it's mathematical. Australian property has a combination of characteristics that makes leverage not just beneficial but essential for maximising returns: high rental yields (5-8% after renovation), strong capital growth (7%+ in growth corridors), full tax deductibility on investment interest, and a stable banking system that allows 80% LVR on residential property.

Let me show you why paying cash is, counterintuitively, the most expensive way to buy Australian investment property.

## The leverage multiplier: one property vs five

Scenario 1: You have $1,000,000 in cash. You buy one investment property for $1,000,000, outright, no mortgage.

The property grows at 7% per year. After one year, it's worth $1,070,000. Your return: $70,000 on a $1,000,000 investment. That's 7%.

Scenario 2: Same $1,000,000. Instead of buying one property outright, you use it as five deposits of $200,000 each. Each deposit is 20% of a $1,000,000 property (or you buy slightly cheaper properties — say five at $850K with $170K deposits plus transaction costs). You now control $4,250,000 worth of property with $1,000,000 of your own money.

Each property grows at 7%. Total appreciation: $297,500 across the portfolio. Your return: $297,500 on a $1,000,000 investment. That's 29.75%.

Same capital. Same market conditions. Same growth rate. But leveraged, your return is 4.25x higher. This is the most basic version of the leverage multiplier, and it's the mathematical reason property consistently outperforms cash-purchased assets over medium and long time horizons [1].

Yes, you're paying interest on four additional mortgages. At current rates of 6.49-6.79% on IO loans, that's approximately $220,000 per year in interest across the portfolio. But if each property generates $850 per week in rent (our actual average for well-selected Melbourne southeast houses), your five properties produce $221,000 in annual rent — almost exactly covering the interest.

Rent covers interest. You keep the growth. The leverage is effectively free.

## Good debt vs bad debt: the Rich Dad framework, applied properly

Robert Kiyosaki's Rich Dad Poor Dad introduced the concept of good debt and bad debt to popular culture. Most people who quote it don't actually apply it correctly. Here's how it works in Australian property.

Bad debt: borrowing that takes money out of your pocket. A car loan. A personal loan for a holiday. A home loan on a PPOR (the house doesn't generate income, and the interest isn't tax-deductible). You service bad debt from your salary. Every repayment makes you poorer in real terms.

Good debt: borrowing that puts money into your pocket. An investment property mortgage where the rental income covers the interest, the interest is tax-deductible, and the asset appreciates. You don't service good debt — the tenant does. Every year of holding makes you wealthier.

In China, almost all property debt is bad debt. Rental yields of 1-2% don't cover even the interest on a typical Chinese mortgage, let alone the principal. The entire strategy relies on capital growth to overcome the cash flow deficit. If growth stalls — as it has in many Chinese cities since 2021 — you're trapped in a negatively geared position with no exit.

In Australia, investment property debt can be structured as genuinely good debt. Our team routinely achieves rental yields of 5.5-6.5% after light renovation [2]. At these yields, IO interest costs are covered by rent. The borrower's out-of-pocket contribution is near zero. The tenant pays the interest. The owner keeps the growth. The ATO reduces the owner's tax bill because the interest is deductible.

That's not debt as burden. That's debt as wealth-building infrastructure. And it only works because Australian rental yields are high enough to support it.

## Why the bank wants you to borrow (and why that's actually fine)

Here's a thought that might reframe your relationship with banks: the bank wants you to borrow because lending money is how they make money. And in Australian residential property, they lend at extremely favourable terms because they know — based on 100+ years of data — that well-located residential property almost never defaults at scale.

Australian banks will lend you 80% of a property's value at 6-7% interest, secured against an asset that has never experienced a national price decline of more than 10% [3]. From the bank's perspective, this is one of the safest lending categories in existence. The asset is physical, immovable, and backed by land that appreciates over time.

Compare this to any other asset class. Stocks? Banks won't lend you 80% against a share portfolio. Crypto? Banks won't even look at it. Business? Maybe 50% against business assets, at higher rates, with personal guarantees. Commercial property? 60-70% LVR at higher rates.

Residential property is the only asset class where institutional lenders will extend 80% leverage at reasonable rates to individual retail investors. This is an extraordinary structural advantage that exists in very few countries at this scale. In the US, you can get high-LVR residential loans, but the foreclosure risk is higher and the rental yield-to-price ratio in growth cities is often worse. In the UK, similar. In China, the yields don't support the debt.

Australia sits in a sweet spot where leverage is accessible, affordable (relative to yields), tax-advantaged, and secured against a historically stable asset class. Not using this advantage is like having access to a wholesale price that nobody else gets and choosing to pay retail.

## The compounding effect over 10 and 20 years

Let's extend the leverage multiplier over real time horizons.

Cash purchase: $1M property, no mortgage. 7% growth per year.
- After 10 years: $1,967,151. Total growth: $967K.
- After 20 years: $3,869,684. Total growth: $2,870K.

Leveraged purchase: $1M capital deployed as 20% deposits across five properties worth $4.25M total. 7% growth per year.
- After 10 years: $8,360,391 portfolio value. Total growth: $4,110K. Your $1M equity is now worth approximately $4,360K (portfolio value minus original debt).
- After 20 years: $16,446,408 portfolio value. Total growth: $12,196K.

The leverage gap grows exponentially over time because the growth rate applies to the entire asset base, not just your equity. After 20 years, the leveraged portfolio has generated $9,326K more in growth than the cash purchase — from the same $1M starting capital [4].

And remember: during those 20 years, the rent from five properties was covering the interest on the loans. Your ongoing cash contribution was near zero. The tenant funded the leverage. The bank provided the capital. You kept the growth.

This is why every wealthy property investor I've met — every single one — uses leverage. Not because they can't afford to pay cash. Because paying cash is mathematically inferior. The maths doesn't care about your comfort level. It just compounds.

## How Australian rental yields make leverage structurally viable

I keep emphasising rental yields because they're the linchpin of the entire leverage strategy. Let me explain why.

Leverage without cash flow is speculation. If you borrow 80% to buy an asset that generates no income — a vacant block of land, an off-the-plan apartment under construction, a painting — you're entirely dependent on capital appreciation to service the debt. If appreciation stalls or reverses, the debt consumes you.

Leverage with cash flow is investment. When the asset's income covers the debt service cost, you can hold indefinitely regardless of short-term price movements. You don't need to sell during a downturn. You don't need to top up from your salary. The asset is self-sustaining.

Australian residential property in well-selected growth corridors achieves 5.5-6.5% gross rental yields after light renovation [2]. At 80% LVR with IO rates of 6.49-6.79%, the interest cost on the borrowed portion is approximately 5.2-5.4% of the total property value. Gross yield of 5.5-6.5% minus interest-equivalent of 5.2-5.4% leaves a positive or neutral cash flow before expenses.

This is why Australian property leverage works and Chinese property leverage doesn't. Chinese rental yields are 1-2%. At 80% LVR, the interest cost is 3-4% of property value. The cash flow gap is 2-3% — meaning the investor must subsidise the property from their salary by $20,000-$30,000 per year. That's not leverage as wealth building. That's leverage as wealth destruction.

The yield is the moat. As long as rents in Melbourne's southeast corridors stay above 5% (they're currently 5.5-6.5% and rising), the leverage strategy remains viable. And with national vacancy at historic lows and net migration at record highs, there's no structural reason for yields to compress below 5% in the foreseeable future.

Our entire acquisition strategy starts with yield assessment. If a property can't generate 5.5%+ gross yield within 6 months of purchase (including planned renovation), we don't buy it — regardless of how strong the capital growth story looks. Because without the yield, the leverage doesn't work. And without leverage, the returns are pedestrian.

## The risk side of leverage: what can actually go wrong

I've been making the case for leverage, and I believe every word of it. But I'd be doing you a disservice if I didn't address the risks explicitly. Because leverage amplifies losses just as effectively as it amplifies gains.

Risk 1: Interest rate spikes. If rates jump from 6.5% to 8.5%, the annual interest cost on a $560K loan increases by approximately $11,200. If your property's rent doesn't increase proportionally, you'll need to subsidise from your salary. On a five-property portfolio, that's a $56,000 annual cash flow hit. This is why we stress-test every acquisition at +2% rates before purchase.

Risk 2: Vacancy. If your property sits empty for 4 weeks between tenants, you lose approximately $3,400 in rent while still paying $2,800 in interest. In our growth corridors (1.2-1.5% vacancy), this risk is minimal — our average time-to-lease is under 14 days. But in a softer market, extended vacancy can turn a positive-cash-flow property negative very quickly.

Risk 3: Property-specific devaluation. A contamination event (meth lab), major structural defect (foundation failure), or adverse zoning change can reduce your property's value significantly while the debt remains unchanged. Landlord insurance covers some of these scenarios. Thorough due diligence prevents most of them.

Risk 4: Forced sale in a downturn. If you need to sell during a market correction — because you've lost your job, because your other investments failed, because of personal circumstances — you may sell at a loss while still owing the full mortgage. Leverage turns a 10% market decline into a 50% equity loss (on 80% LVR).

Mitigation: maintain a cash buffer of $30-50K per property. Never leverage above 80% LVR. Diversify across 3+ properties to reduce single-property risk. Stress-test cash flow at +2% interest rates. And only buy in markets with structural demand support (population growth, infrastructure, supply constraints) that provide a floor under both prices and rents.

Leverage is powerful medicine. Like all powerful medicine, the dosage matters. 80% LVR on a well-selected, cash-flow-positive property in a growth corridor? That's the therapeutic dose. 90%+ LVR on a speculative asset in a declining market? That's an overdose.

Respect the tool. Use it correctly. And it will build more wealth than any other financial instrument available to retail investors in Australia.

## When to NOT use leverage (yes, these situations exist)

I'd be irresponsible not to mention the scenarios where cash purchase or low leverage makes sense.

SMSF purchases: Self-Managed Super Fund property investments have restrictions on structural modifications (no adding granny flats or converting rooms while the property is held in the SMSF with a loan). SMSF borrowing rates are also typically 1-2% higher than standard residential rates. For some SMSF strategies, particularly in regional Victoria where properties cost $400-500K and generate 5-6% yields, lower leverage or cash purchase within the fund may be appropriate [5].

Near-retirement investors: If you're 55+ and your investment timeline is 10 years or less, the compounding benefit of leverage is reduced while the cash flow risk (interest rate spikes, vacancy events) remains. Lower leverage — 50-60% LVR instead of 80% — provides a buffer that's worth the reduced return.

Properties with development intent: If you're buying to subdivide or develop within 2-3 years, the holding period is too short for growth compounding to offset the interest cost. In development scenarios, minimising holding costs (including interest) maximises project profit.

But for the typical investor — 30-50 years old, 10-20 year horizon, buying well-selected houses in growth corridors — maximum leverage at 80% LVR is the mathematically optimal strategy. Not because debt is good in some abstract philosophical sense. Because in the specific context of Australian residential property with 5.5-6.5% yields and 7%+ growth, the numbers say so.

And the numbers don't lie.

## References

1. [CoreLogic, '25-Year Residential Property Returns — Melbourne', 2020. Compound annual growth 7.0-7.5% for middle-ring suburbs.](https://www.corelogic.com.au/research/quarterly-economic-review)
2. [PremiumRea portfolio data. Average rental yield 5.5-6.5% after light renovation. 350+ transactions.](#)
3. [Reserve Bank of Australia, 'Financial Stability Review', October 2020. Australian residential property: no national decline >10% in recorded history.](https://www.rba.gov.au/publications/fsr/2020/oct/)
4. [Australian Securities and Investments Commission, 'MoneySmart Compound Interest Calculator', 2020. Used for 10 and 20-year growth projections.](https://moneysmart.gov.au/budgeting/compound-interest-calculator)
5. [Australian Taxation Office, 'SMSF — Limited Recourse Borrowing Arrangements', 2020-21.](https://www.ato.gov.au/Super/Self-managed-super-funds/Investing/Borrowing/)
6. [Reserve Bank of Australia, 'Statistical Tables — Indicator Lending Rates', December 2020.](https://www.rba.gov.au/statistics/tables/)
7. [SQM Research, 'Weekly Rents — Melbourne Southeast', Q4 2020. Median house rents $400-$450 pre-renovation, $800-$950 post-renovation.](https://sqmresearch.com.au/weekly-rents.php)
8. [Domain, 'Leverage and Property Returns — Research Note', 2020.](https://www.domain.com.au/research/)

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Source: https://premiumrea.com.au/blog/leverage-mortgage-multiplier-australian-property-returns
Publisher: PremiumRea (Optima Real Estate) — Melbourne buyers agent