Lenders Mortgage Insurance Versus Saving a Larger Deposit: Which Costs Less Overall in Australia

Key Takeaway

Paying lenders mortgage insurance (LMI) to buy sooner with a smaller deposit can cost less overall than waiting to save 20 per cent if property prices rise faster than your savings rate. However, if you can save the extra deposit quickly or in a flat market, avoiding LMI saves thousands in upfront fees and reduces your total loan size. The best choice depends on your savings capacity, local price growth, and how long you need to wait.

Introduction

When you have less than a 20 per cent deposit, Australian lenders typically require lenders mortgage insurance (LMI), a one-off premium that protects the lender if you default. Many buyers assume waiting to save a full 20 per cent deposit always saves money by avoiding LMI, but the true cost comparison must account for property price growth, rent paid while saving, and opportunity cost. This guide compares both paths with worked examples to help you decide which costs less for your situation.

Quick Comparison

Factor	Pay LMI Now	Wait for 20% Deposit
Upfront LMI cost	A$8,000 to A$30,000+ (added to loan)	A$0
Time to purchase	Immediate (with 5-10% deposit)	1 to 4+ years
Exposure to price growth	Buy at today’s price	Risk of higher purchase price
Rent paid while saving	Stop renting sooner	Continue paying rent
Loan size	Larger (LMI capitalised)	Smaller
Interest paid over loan life	Higher (larger loan)	Lower (smaller loan)
Equity position	Lower initial equity	Higher initial equity

Option 1: Pay LMI and Buy Sooner

How It Works

When your deposit is below 20 per cent of the property value (loan-to-value ratio or LVR above 80 per cent), the lender charges LMI to cover their risk. The premium ranges from around 1 to 4 per cent of the loan amount depending on your LVR, loan size, and lender. Most buyers capitalise the LMI into the loan rather than paying it upfront in cash, so you pay interest on it for the life of the loan.

According to ASIC MoneySmart, LMI protects the lender, not you, and the cost increases sharply as your deposit shrinks (MoneySmart, 2026). For a A$500,000 property with a 10 per cent deposit (A$50,000), you borrow A$450,000 at 90 per cent LVR. LMI might cost A$15,000 to A$18,000, added to your loan for a total debt of A$465,000 to A$468,000.

Pros

• Enter the market sooner: you stop paying rent and start building equity immediately, and any price growth benefits you rather than pricing you out further.
• Capture price growth: in a rising market, buying today at A$500,000 beats waiting two years and paying A$550,000 even after accounting for LMI.
• Preserve cash savings: you keep more cash for furniture, emergency funds, and offset account deposits that reduce interest.

Cons

• Higher total loan: capitalising LMI increases your debt and the interest you pay over 25 to 30 years.
• Non-refundable: if you refinance or sell within a few years, you have paid LMI for a loan you no longer hold, and the new lender may charge LMI again unless your equity has grown past 20 per cent.
• Larger repayments: a bigger loan means higher monthly repayments, tightening your budget.

Option 2: Save a 20% Deposit and Avoid LMI

How It Works

By waiting until you have saved at least 20 per cent of the purchase price, your LVR drops to 80 per cent or below and the lender waives LMI. For a A$500,000 property, you need a A$100,000 deposit. If you currently have A$50,000 and save A$2,000 per month, you reach A$100,000 in about 25 months.

Pros

• No LMI fee: you save A$15,000 to A$30,000 in upfront costs, keeping your loan size smaller.
• Lower interest over time: a A$400,000 loan at 6.5 per cent costs roughly A$115,000 less in interest over 30 years than a A$465,000 loan at the same rate (illustrative, rates vary).
• Stronger equity position: you own 20 per cent of the property from day one, reducing your risk if prices fall.

Cons

• Rent paid while saving: two years of rent at A$2,200 per month costs A$52,800, money you never recover.
• Opportunity cost: the price you are saving for may rise while you save. If property prices grow 6 per cent per year, that A$500,000 home costs A$530,000 in one year and A$561,800 in two years, requiring a deposit of A$112,360 instead of A$100,000. You are chasing a moving target.
• Delayed equity building: every month you rent is a month you are not benefiting from price growth or paying down a home loan principal.

Read also: How to Avoid or Reduce Lenders Mortgage Insurance (LMI) in Australia

Which Costs Less? Worked Example

Scenario: You want to buy a A$500,000 property today and have a A$50,000 deposit (10 per cent). Variable rate 6.5 per cent, 30-year loan. Rent A$2,200 per month. You can save A$2,000 per month. Property prices grow 5 per cent per year (historical long-run average in many Australian capitals, though individual markets vary).

Path 1: Pay LMI Now

• Purchase price today: A$500,000
• Loan: A$450,000 + A$16,000 LMI = A$466,000
• Total interest over 30 years (6.5%): approximately A$590,000
• Total cost: A$466,000 + A$590,000 = A$1,056,000
• Rent paid: A$0 (you move in now)
• Grand total: A$1,056,000

Path 2: Wait 25 Months, Save 20% Deposit

• Property price in 25 months (5% annual growth): A$500,000 × 1.05^2.08 ≈ A$554,000
• Deposit needed (20%): A$110,800
• You save A$50,000 in 25 months, total A$100,000 (shortfall A$10,800, assume you bridge it or prices are slightly lower)
• Loan (assume A$550,000 price): A$440,000, no LMI
• Total interest over 30 years (6.5%): approximately A$557,000
• Rent paid while saving: 25 months × A$2,200 = A$55,000
• Total cost: A$440,000 + A$557,000 + A$55,000 = A$1,052,000
• Grand total: A$1,052,000

In this scenario, the two paths cost almost the same. Path 2 saves A$4,000, but the margin is slim and sensitive to the assumptions. If price growth is 7 per cent instead of 5 per cent, Path 1 (pay LMI now) costs less. If growth is 2 per cent or flat, Path 2 (wait) saves significantly more.

As covered in foundational finance texts such as Principles of Finance, comparing financial decisions over time requires accounting for all cash flows, including opportunity costs and foregone benefits, not just the headline premium.

Recommendations by Profile

• Rising market, can afford repayments now: pay LMI and buy sooner. Capturing price growth and stopping rent typically outweighs the LMI cost.
• Flat or falling market, tight budget: wait and save 20 per cent. You avoid LMI, reduce loan size, and are not racing against price increases.
• First home buyers eligible for government schemes: check the First Home Guarantee Scheme (FHGS) or state-based LMI waivers, which let you borrow up to 95 per cent LVR with no LMI if you qualify.
• High savings rate, short wait: if you can save the extra deposit in under 12 months, waiting often costs less because rent paid is limited and you avoid years of interest on the LMI amount.

Conclusion

Neither path is universally cheaper. Paying LMI to buy sooner costs less in rising markets or when the alternative is years of rent, while waiting to avoid LMI saves money in stable markets or when you can save quickly. Model your own scenario: estimate local price growth, calculate rent paid while saving, and compare total interest on both loan sizes. Consider consulting a licensed mortgage broker to run scenarios with current lender rates and LMI calculators for your situation.

General Advice Warning: This information is general in nature and does not consider your personal objectives, financial situation, or needs. LMI costs, loan eligibility, interest rates, and property price trends vary by lender, location, and market conditions. The worked example uses illustrative figures for comparison only; your actual costs will differ. Obtain personal advice from a licensed mortgage broker or financial adviser before making a decision. This is not personalised financial or lending advice.