What lenders mortgage insurance actually is
Lenders mortgage insurance, or LMI, is a one-off insurance premium that a borrower pays when their deposit is less than 20% of the property's purchase price. The policy insures the lender, not the borrower, against the risk of a shortfall if the property is repossessed and sold for less than the outstanding loan balance.
Most Australian lenders require LMI when the loan-to-value ratio (LVR) exceeds 80%. That threshold exists because lenders consider higher LVR loans to carry greater default risk. The premium is typically capitalised into the loan, meaning it is added to the loan balance and repaid over time rather than paid as a separate upfront cash amount at settlement.
The size of the premium scales with two variables: the LVR and the total loan amount. A borrower purchasing a $700,000 property with a 10% deposit (90% LVR) will pay a higher LMI premium than someone purchasing the same property with a 15% deposit (85% LVR). Most Australian lenders use one of two LMI providers, Helia (formerly Genworth) or QBE LMI, and premiums are calculated from rate cards that apply a percentage to the insured loan amount based on the LVR tier.
What LMI actually costs at different deposit levels
The numbers move significantly across LVR tiers. On a $630,000 loan at 90% LVR, LMI premiums typically range from $12,000 to $18,000 depending on the lender and insurer. At 85% LVR on the same loan, premiums fall to roughly $8,000 to $10,000. At 95% LVR, premiums on larger loans can exceed $25,000.
When LMI is capitalised into the loan at 6.28%, a $16,000 premium accrues interest over the loan term alongside the rest of the balance. Over 30 years, the interest charges on that $16,000 alone add more than $19,000 to the total amount repaid. This is why the effective cost of LMI is meaningfully higher than the premium figure shown at settlement.
A common question: Can I pay LMI upfront instead of adding it to the loan? Most lenders allow this, but few borrowers opt to do so because it requires additional cash at settlement on top of the deposit, stamp duty, and conveyancing costs already required.
How to avoid LMI when your deposit is below 20%
There are several routes to avoiding LMI without reaching a 20% deposit.
The most widely used is the First Home Guarantee, administered by the National Housing Finance and Investment Corporation (NHFIC) on behalf of the federal government. Eligible first home buyers can purchase with as little as a 5% deposit and the government guarantees the remaining 15%, removing the LMI requirement entirely. Places are capped each financial year, income thresholds apply (currently $125,000 for individuals and $200,000 for couples), and property price caps vary by location.
A guarantor loan achieves a similar outcome through a different mechanism. If a parent or close family member offers their own property as additional security for part of the loan, the effective LVR against the purchased property can drop below 80%, eliminating LMI. Guarantor arrangements carry genuine financial risk for the guarantor and require independent legal advice. Both parties need to understand clearly what is being secured and under what circumstances the guarantor's property could be called upon.
Some lenders also offer LMI waivers for borrowers working in specific professions, including medicine, dentistry, law, accounting, and engineering. Eligible applicants can sometimes borrow up to 90% LVR without LMI, though the specific professions, loan sizes, and conditions vary by lender.
Whether paying LMI can make financial sense
This is where the question becomes genuinely situation-dependent. Paying LMI is not automatically a poor financial decision. In certain markets, the cost of waiting another 12 to 18 months to save a larger deposit can exceed the LMI premium, particularly when property prices are rising.
Consider a buyer who pays $18,000 in LMI to purchase a $750,000 property six months earlier than they otherwise would have. If prices in that suburb rise 5% over those six months, the property increases in value by $37,500. The buyer who waited and avoided LMI enters a market that now costs $37,500 more. The LMI cost is offset against a significantly larger price increase. Whether this trade-off makes sense depends on the specific market, the realistic price trajectory, and the individual's savings rate during the waiting period.
This calculation is not straightforward and the assumptions matter considerably. A qualified financial adviser and mortgage broker together can model both scenarios using current market data and your actual savings capacity. Tax, stamp duty implications on a higher purchase price, and the cost of ongoing rent during the waiting period also factor into a complete comparison.
The deposit strategy question: 20% or enter sooner?
The 20% deposit threshold matters because it is the point at which LMI disappears entirely and, at many lenders, the point at which better interest rates become available. Borrowers above 80% LVR are often placed on a higher rate tier until they reduce their loan enough to cross that threshold.
Whether reaching 20% before purchasing makes sense depends on how quickly you can realistically get there, what your current rent costs relative to likely mortgage repayments, and what the property price trend looks like in your target area. For buyers close to 20%, the premium saving by waiting a few more months can be well worth it. For buyers at 5% to 10% deposit with a long savings runway ahead, the calculation is less clear.
A mortgage broker can calculate exact LMI figures across multiple lender scenarios and compare them against a continued savings projection, so you are working from specific numbers rather than estimates.
