How Is LMI Calculated in Australia? What Drives the Premium and How to Reduce It

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If you have ever asked how is LMI calculated, the short version is that lenders mortgage insurance is priced from your loan to value ratio (LVR), the size of your loan and the type of borrower you are, using a scale set by each lender's insurer. It is a one-off premium that applies when you borrow more than 80 per cent of a property's value, and it can run to tens of thousands of dollars on larger loans.

What LMI is and who it protects

Lenders mortgage insurance is a policy that covers the lender, not you, if a borrower defaults and the sale of the property does not clear the debt. Lenders generally see loans above 80 per cent of the property value as higher risk, so they either require LMI or decline the loan. The borrower pays the premium, but the insurer can still pursue a borrower for any shortfall after paying the lender.

That distinction matters. LMI is not mortgage protection insurance and it will not cover your repayments if you lose your job or fall ill. Its job is to let lenders say yes to buyers who have a smaller deposit, which is why it sits behind many first home purchases across the country.

How is LMI calculated: the main factors

There is no single national formula. Each lender works with one or more insurers, and each insurer publishes its own pricing grid. The grid usually starts with these inputs.

1. Loan to value ratio

LVR is your loan divided by the property value. A $640,000 loan against an $800,000 property is an LVR of 80 per cent. Most lenders do not charge LMI at or below 80 per cent, although some apply it in narrower cases depending on the property type or location. Above 80 per cent, the premium rate steps up as the LVR climbs, and the jump between 90 and 95 per cent is typically the steepest.

2. Loan amount

The premium is a percentage of the loan, so a larger loan costs more in dollar terms. Many pricing scales also change by loan size band, which means two borrowers at the same LVR can pay different rates if their loans sit in different bands.

3. Borrower type and purpose

Owner-occupiers are usually priced more favourably than investors, and some lenders add a loading for self-employed borrowers. First home buyers and borrowers with a genuine savings history may be treated differently depending on the lender's policy.

4. The lender and insurer

Because pricing is set lender by lender, the same loan can attract noticeably different premiums depending on which lender you choose. That is one reason it is worth comparing the total cost of a loan, including LMI, and not only the interest rate.

How your deposit changes your LVR

The table below shows how deposit size drives LVR on an illustrative $800,000 purchase. It does not include stamp duty or other costs, and it does not show premiums, because those depend on the lender.

Deposit	Deposit amount	Loan amount	LVR	LMI usually applies
5%	$40,000	$760,000	95%	Yes, at the highest rates
10%	$80,000	$720,000	90%	Yes
15%	$120,000	$680,000	85%	Yes, at lower rates
20%	$160,000	$640,000	80%	Generally no

An illustrative example, including capitalised LMI

Suppose you buy a $700,000 home with a 10 per cent deposit of $70,000. Your loan is $630,000 and your LVR is 90 per cent. For illustration only, assume the insurer's rate for this loan is 2.0 per cent. That is a hypothetical figure, not a quote, and your actual rate could be higher or lower. The premium would be $12,600.

If you add the premium to the loan, your borrowing becomes $642,600, which is an LVR of 91.8 per cent. Assuming a 6.34 per cent variable rate over 30 years, the extra $12,600 adds roughly $78 a month to your repayments, and you pay interest on it for as long as it stays in the loan. Paying the premium in cash avoids that cost, but uses money you may need for the deposit, stamp duty and moving expenses.

Ways to reduce or avoid LMI

Because LMI can be a large, one-off cost, it is worth knowing the common ways borrowers reduce it or avoid it entirely.

• Save a larger deposit. Moving from 90 to 85 per cent LVR lowers the rate, and reaching 80 per cent generally removes LMI.
• Use the Australian Government 5% Deposit Scheme. Eligible first home buyers can buy with as little as 5 per cent deposit without paying LMI, because Housing Australia guarantees part of the loan. Price caps and eligibility differ by location, and you apply through a participating lender, so check the current rules on the Housing Australia website.
• Check for professional LMI waivers. Some lenders waive or discount LMI for professions such as doctors, nurses, pharmacists and lawyers. Our guide to LMI waivers for professionals explains who may qualify.
• Consider a family guarantee. Using a parent's property as additional security can reduce the LVR on the lender's books, but it puts the guarantor's property at risk, so independent advice for them is important.
• Compare lenders. Pricing and policy differ, so asking for quotes from several lenders can reveal a meaningful gap.

Is paying LMI ever worth it

Sometimes it is. If property prices in your target area are rising faster than you can save, or rent is eating into your savings, buying earlier with LMI can be a reasonable trade-off. In a softer market the reverse can apply: with values falling, a high LVR leaves less buffer, which is worth thinking about carefully. Our article on borrowing power and the serviceability buffer covers how lenders test whether you can afford the loan in the first place.

Michael and the team model both paths for clients: buying now with LMI against waiting to reach 80 per cent, including the total interest and the cost of the premium. You can start with a quick rate check or explore the free calculators on our tools page.

For more answers on loans, fees and the application process, see our frequently asked questions. Mankin Finance holds 130+ five-star Google reviews from clients across Australia.