What is the minimum deposit to avoid LMI?
To avoid Lenders Mortgage Insurance (LMI), you need a deposit of at least 20% of the purchase price — this gives you an 80% loan-to-value ratio (LVR). Below 20%, most lenders will charge LMI, which protects the lender (not you) if you default. The cost varies but can reach tens of thousands of dollars on a typical Illawarra purchase, and is usually added to your loan balance.
The Fuller Picture
Lenders Mortgage Insurance is a one-off premium charged when your deposit falls below 20% of the property's purchase price. It exists to protect the lender — not you — in the event that you default and the property sells for less than what you owe. The cost is typically added to your loan balance, which means you end up paying interest on it for the life of the loan.
The 20% threshold is the most common benchmark, but lenders don't all draw the line in exactly the same place. Some lenders will allow borrowing up to 85% LVR without LMI through professional packages, particularly for medical, legal, or accounting professionals. The LMI premium itself is calculated on a sliding scale — the higher your LVR, the more expensive the insurance, and the difference between 85% and 95% LVR can be significant.
Several government schemes allow eligible buyers to purchase with less than a 20% deposit without triggering LMI. The First Home Guarantee allows eligible first home buyers to purchase with as little as 5% deposit, with the government guaranteeing up to 15% of the purchase price — meaning the lender treats it as an 80% LVR loan. These schemes have income caps, property price caps, and limited places each financial year, so eligibility is not automatic.
What This Means for Your Purchase
The practical impact is about timing and total cost. Saving to 20% takes longer but typically costs less overall, since you avoid the LMI premium entirely. Entering the market earlier with a smaller deposit means paying LMI, but you may benefit from property price growth in the interim — particularly relevant if prices in your target area are rising faster than you can save. Neither option is universally better; it depends on your savings rate and how the local market is moving.
LMI can be a significant cost. On an $800,000 purchase with a 10% deposit, the LMI premium could be $15,000–$22,000 depending on the lender and insurer. That amount is usually capitalised — added to your loan — so you are effectively borrowing it and paying interest on it over 25–30 years. Understanding this true cost is important when comparing the decision to buy now versus save more.
Your lender will use their own valuation — not the purchase price — when calculating your LVR. If the bank values the property below what you paid, your effective LVR goes up, which can push you into LMI territory even if you thought your deposit was sufficient. This is a practical risk when buying at auction, where there is no finance clause to fall back on.
How This Shows Up in the Illawarra
In Wollongong, Shellharbour, and the broader Illawarra market, entry-level houses currently sit in the $750,000–$1,000,000 range, with units and townhouses starting lower. A 20% deposit on an $800,000 purchase is $160,000 — a figure that takes most buyers several years to accumulate after rent and living costs. For that reason, many buyers in this market do purchase with 10% or 5% deposits and factor the LMI cost into their overall buying budget as a deliberate trade-off.
The prevalence of auctions in coastal Illawarra suburbs — particularly Thirroul, Austinmer, and parts of Wollongong — adds a layer of risk. At auction, you exchange contracts immediately with no cooling-off period and no finance clause. If your bank later values the property lower than your winning bid, your effective LVR rises and an LMI charge you did not plan for can appear. Working through a mortgage broker who understands local valuations before auction day reduces that risk considerably.
What to Do
Once you understand the LMI threshold, you can make an informed decision about whether to wait and save more, or enter the market sooner and absorb the cost as part of your budget.
- Ask your mortgage broker to calculate your exact LMI premium at 5%, 10%, 15%, and 20% deposit for your target price range — the difference between these levels is often larger than buyers expect
- Check whether you qualify for the First Home Guarantee or Regional First Home Buyer Guarantee, which can eliminate LMI on a 5% deposit if you meet the eligibility requirements
- If you are close to the 20% threshold, ask your lender whether an LMI waiver is available for your profession or through a specific loan product
- Factor LMI into your total purchasing costs alongside stamp duty, legal fees, and inspection costs — not just your deposit figure
- Before bidding at auction, confirm your lender's likely valuation of the property so there are no surprises on your actual LVR after exchange
- If you plan to capitalise LMI into your loan, ask your broker to show the total interest cost over the loan term — it helps clarify whether saving a little longer is the better financial decision
Frequently Asked Questions
Does LMI protect me as the buyer?
No. LMI protects the lender, not you. If you default and the property sells for less than what you owe, the insurer compensates the lender — and may then pursue you for the shortfall. You receive no direct benefit from the premium you pay.
Can LMI be refunded if I pay my loan off early?
LMI premiums are generally non-refundable, though some insurers offer a partial refund in the first year. If you refinance within the first few years, you may need to pay LMI again with the new lender — this is worth considering before refinancing early in your loan term.
As a first home buyer, can I avoid LMI with less than a 20% deposit?
Yes, if you qualify for the First Home Guarantee. This scheme allows eligible first home buyers to borrow up to 95% LVR without paying LMI, because the government guarantees the gap. Annual places are limited, and income and property price caps apply.
How is LMI calculated?
LMI is calculated based on your loan amount and LVR. The premium increases as the LVR rises — borrowing at 90% LVR costs more than at 85% LVR. Your lender or mortgage broker can provide an estimate based on your specific deposit amount and purchase price.
If I'm just under the 20% threshold, is it worth saving a bit more?
Often, yes. If you are at 18–19% deposit, saving for another few months to clear the LMI threshold can save a meaningful premium. Your broker can show you the exact figures, and the answer usually depends on how fast prices are moving in your target suburb relative to your savings rate.
Can a buyers agent help with LMI-related risks?
A buyers agent cannot arrange your finance, but they can help by assessing likely bank valuations before you bid at auction. That gives you a clearer picture of your true LVR and reduces the risk of paying more than the bank's assessed value — and being hit with an unexpected LMI charge after exchange.
If you're weighing up whether to enter the market now or save a larger deposit, a conversation with a local buyers agent can help you think through the trade-offs specific to your situation. Reach out to The Shoreline Agency and we can walk you through how this plays out in the Illawarra market.
