Should You Avoid LMI? What the Numbers Actually Show

What Is LMI and Why Do People Want to Avoid It?

Lenders Mortgage Insurance is a one-off cost charged by the bank when you borrow more than 80% of a property's value. It protects the lender, not the borrower, in the event of a default.

On a $500,000 property with a 10% deposit, LMI costs approximately $7,000 to $10,000 depending on the lender and loan size. That cost can be paid upfront or added to the loan balance.

Most investors hear the word insurance attached to a cost that benefits the bank and immediately want to avoid it. That reaction is understandable. It is also, in many cases, the decision that costs them significantly more over time.

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The Real Question Is Not LMI. It Is Opportunity Cost.

The decision between a 10% and 20% deposit is not really about LMI. It is about what you do with the difference.

Consider this scenario using a $500,000 property:

• A 20% deposit requires $100,000 plus approximately $35,000 in upfront costs. Total cash required: $135,000. You control one property worth $500,000.
• A 10% deposit requires $50,000 plus $35,000 in upfront costs per property. With $100,000 you can split that across two $500,000 properties, putting $85,000 into the first and using the remaining capital toward the second.

Same starting capital. Very different outcome.

At a conservative 5% annual growth rate over 10 years:

• One $500,000 property grows to approximately $814,000. Equity generated: $414,000. Cash-on-cash return on the $135,000 outlay: approximately 306%.
• Two $500,000 properties worth $1,000,000 combined grow to approximately $1,620,000. Equity generated: $720,000. Cash-on-cash return on the $170,000 total outlay: approximately 423%.

The 10% deposit strategy generates $306,000 more in equity over 10 years, even after accounting for LMI costs. That gap widens significantly over 20 and 30-year hold periods as compounding accelerates.

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Why Debt Is Not the Enemy

There is a mindset shift that separates investors who build substantial portfolios from those who stay stuck at one property. It is the understanding that debt attached to a growing asset is not a liability, it is leverage working in your favour.

Here is a simple example: if you purchased a property in Sydney 30 years ago for $200,000 with a 100% loan, your debt today would still be $200,000. The property, however, would be worth somewhere between $2 million and $3 million. Your loan-to-value ratio would have fallen from 100% to roughly 7% through growth alone, without paying down a single dollar of principal.

This is the compounding nature of capital growth combined with the devaluation of currency over time. The debt stays fixed. The asset keeps growing. Over long enough time horizons, the debt becomes almost irrelevant relative to the value it helped you control.

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When Avoiding LMI Does Make Sense

The 10% deposit strategy works best when you have the borrowing capacity to service two properties and the financial buffers to hold through challenging periods.

If your borrowing capacity only allows for one property, the LMI argument changes. In that case, putting 20% down removes the LMI cost without sacrificing portfolio scale, because you could not buy a second property anyway. The extra 10% sitting in an offset account may actually serve you better as a buffer than being deployed into a second purchase you cannot service.

The honest answer is that the right deposit size depends on your individual position. What your income supports, what your borrowing capacity allows, and what cash reserves you can maintain after settlement are all variables that change the calculation.

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The Cash on Cash Return Comparison

To make this concrete, here is how the two scenarios compare on a cash-on-cash basis over 10 years using conservative 5% annual growth:

20% deposit strategy:

• Total cash outlay: $135,000
• Equity after 10 years: $414,000
• Cash-on-cash return: approximately 306%

10% deposit strategy (two properties):

• Total cash outlay: $170,000
• Equity after 10 years: $720,000
• Cash-on-cash return: approximately 423%

For every dollar deployed in the 10% strategy, you generate approximately $4.23. For every dollar in the 20% strategy, approximately $3.06. The LMI cost is absorbed and then significantly outpaced by the additional equity generated through the second asset.

These numbers are based on a conservative growth assumption. In markets delivering closer to the long-term national average of 6 to 7% annually, the gap between the two strategies widens further.

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What This Means for Your Portfolio Strategy

The investors who build substantial portfolios over 10 to 20 years are rarely the ones who waited until every cost was minimised before entering the market. They are the ones who understood that time in the market, and the compounding that comes with it, consistently outweighs the cost of LMI.

Every month spent waiting to accumulate a larger deposit is a month the market moves without you. On a $500,000 property growing at 6% annually, that is approximately $2,500 in value growth per month. LMI of $7,000 to $10,000 is recovered within four to five months of ownership.

The first step is always the hardest. The numbers consistently show it is also the most important.

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Ready to Work Out the Right Strategy for Your Position?

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. We'll discuss your goals and position, and help you build a clear plan to move forward with confidence.