Lenders mortgage insurance (LMI) is a one-off premium charged when your deposit is below 20 per cent of the property value. The cost typically ranges from a few thousand to tens of thousands of dollars, depending on your loan-to-value ratio (LVR), loan amount, and the lender’s insurer. Our LMI calculator helps you estimate this cost quickly before you commit to a high-LVR home loan.

What Is Lenders Mortgage Insurance?

Lenders mortgage insurance (LMI) protects the lender, not you, if you default on a home loan where the deposit is less than 20 per cent of the property value. According to ASIC MoneySmart, LMI allows borrowers to enter the property market sooner with a smaller deposit, but it adds a significant upfront cost to your loan (MoneySmart, 2026).

Most Australian lenders require LMI when your loan-to-value ratio (LVR) exceeds 80 per cent. The LVR is calculated as your loan amount divided by the property value. For example, if you borrow A$480,000 to buy a A$600,000 home with a A$120,000 deposit, your LVR is 80 per cent and you avoid LMI. Drop the deposit to A$60,000, and your LVR rises to 90 per cent, triggering an LMI premium.

How LMI Premiums Are Calculated

LMI is not a standard percentage. Insurers assess several factors to determine the premium, making each calculation specific to your loan:

Loan-to-value ratio (LVR). The higher your LVR, the greater the risk to the lender and the higher the LMI premium. An LVR of 85 per cent attracts a lower premium than 95 per cent for the same loan amount.

Loan amount. Larger loans carry higher premiums in dollar terms because the insurer’s potential exposure increases. A A$500,000 loan at 90 per cent LVR will have a higher LMI cost than a A$300,000 loan at the same LVR.

Property type and use. Owner-occupied homes typically attract lower LMI premiums than investment properties because insurers view owner-occupiers as lower risk. Apartments and non-standard dwellings may also incur higher premiums compared to detached houses.

Postcode and location. Some insurers adjust premiums based on the property’s postcode, reflecting regional market volatility and historical default rates.

Insurer and lender. Each lender uses one or more LMI providers (such as Genworth or QBE), and premium scales differ between insurers. Comparing lenders can reveal material differences in LMI cost for the same LVR.

As foundational texts such as Principles of Finance explain, insurance pricing reflects actuarial risk assessment, and mortgage insurance is no exception: the premium is calibrated to the probability of default and the insurer’s potential loss.

Example Scenario

Suppose you are purchasing a home valued at A$700,000 with a deposit of A$70,000. Your loan amount is A$630,000, giving you an LVR of 90 per cent. Using typical insurer scales as of August 2026, your LMI premium might range from A$15,000 to A$25,000, depending on the lender and insurer. You can capitalise this premium (add it to your loan balance) or pay it upfront at settlement.

If you increase your deposit to A$140,000, your LVR drops to 80 per cent and you eliminate the LMI cost entirely, saving tens of thousands of dollars over the life of the loan.

Read also: How to Calculate LMI on a High-LVR Home Loan in Australia

Using the LMI Calculator

Our LMI calculator estimates your premium in seconds. Enter the property value, your deposit amount (or your intended LVR), and select the property type and loan purpose. The calculator returns an approximate LMI cost based on current insurer scales and shows how changing your deposit affects the premium.

The estimate is indicative only. Actual LMI premiums are quoted by your lender once your application is assessed. Factors such as your credit file, employment type, and the lender’s risk appetite can influence the final figure. Always confirm the exact LMI cost with a licensed mortgage broker or lender before proceeding.

How to Reduce or Avoid LMI

Save a larger deposit. Reaching a 20 per cent deposit eliminates LMI entirely. Even a small increase in your deposit can reduce the premium materially by lowering your LVR.

Use a family guarantee. Some lenders allow a parent or family member to guarantee part of your loan using their property equity, reducing your effective LVR and potentially waiving LMI.

Access government schemes. The Home Guarantee Scheme (including the First Home Guarantee component) allows eligible first-home buyers to borrow up to 95 per cent LVR without paying LMI, with the Commonwealth guaranteeing the lender’s risk (Housing Australia, 2026).

Compare lenders and insurers. LMI premiums vary between lenders because each uses different insurers and scales. A mortgage broker can compare LMI costs across lenders to find the lowest premium for your situation.

Consider the trade-off. Paying LMI to enter the market sooner may be financially sound if property values are rising, even though the premium adds to your total borrowing cost. Run the numbers with your broker to weigh upfront LMI against potential capital growth and rental savings.

Next Steps

Use our LMI calculator above to estimate your premium and see how adjusting your deposit changes the cost. Once you have an indicative figure, speak with a licensed mortgage broker or lender to confirm the actual LMI amount for your loan application and explore strategies to reduce or avoid it.

LMI is regulated by APRA and the cost, eligibility, and availability vary by lender, insurer, property type, and your personal circumstances (APRA, 2026). This information is general in nature only and does not consider your objectives, financial situation, or needs. You should consider obtaining personal advice from a licensed mortgage broker or financial adviser before acting on it.

General Advice Warning: The information in this article is general in nature and does not consider your personal objectives, financial situation, or needs. It is not personalised financial, lending, or legal advice. Lenders mortgage insurance premiums, loan eligibility, and terms vary by lender, insurer, property type, and your individual circumstances. You should consider obtaining advice from a licensed mortgage broker or financial adviser before making any borrowing decision. Rates, fees, and government schemes mentioned are current as of August 2026 and are subject to change.