LMI vs Saving 20%: Which Is Smarter?

"Don't pay LMI — it's a waste of money. Save 20% instead." This advice gets repeated constantly. And sometimes it's right. But sometimes it's the most expensive advice you'll ever follow.

The reality is that paying $15,000 in LMI to buy a property two years earlier can leave you $50,000+ ahead compared to waiting. Or it can leave you behind. The answer depends entirely on what the market does — and on your specific numbers. Let's run them.

The setup: Sarah's decision

Sarah is buying her first home in Melbourne. Here's her situation:

• Target property: $800,000
• Current savings: $80,000 (10% deposit)
• Saving rate: $3,000/month
• LMI at 90% LVR: approximately $15,000
• 20% deposit needed: $160,000 (another $80,000 to save)
• Time to save 20%: approximately 27 months (2.25 years)

Scenario 1: Market grows 5% per year

Option A: Buy now with LMI

• Buys at $800,000 with 10% deposit + $15,000 LMI
• After 2.25 years, property worth ~$893,000
• Equity gained from price growth: ~$93,000
• Net position: $93,000 equity gain − $15,000 LMI = $78,000 ahead

Option B: Wait and save 20%

• Saves for 27 months, accumulates $160,000 deposit
• But the $800,000 property is now worth ~$893,000
• 20% deposit on $893,000 = $178,600 (she's $18,600 short!)
• She either needs to save longer, buy a cheaper property, or... pay LMI anyway on the now-more-expensive house

Result: Buying with LMI wins by ~$78,000+. The goalposts moved faster than she could save.

Scenario 2: Market grows 2% per year

Option A: Buy now with LMI

• Buys at $800,000 + $15,000 LMI
• After 2.25 years, property worth ~$836,000
• Equity gained: ~$36,000
• Net: $36,000 − $15,000 LMI = $21,000 ahead

Option B: Wait and save 20%

• Property now costs $836,000, 20% = $167,200
• She's saved $160,000 — close enough to avoid LMI with a small top-up
• No LMI cost, but slightly larger loan
• Net: Saves $15,000 in LMI but missed $36,000 in equity

Result: Buying with LMI still wins, but by a smaller margin (~$21,000).

Scenario 3: Market is flat (0% growth)

Option A: Buy now with LMI

• Buys at $800,000 + $15,000 LMI
• After 2.25 years, property still worth $800,000
• No equity gain from price growth
• Net: −$15,000 (LMI cost with no offsetting gain)

Option B: Wait and save 20%

• Property still $800,000, 20% = $160,000 — exactly what she saved
• No LMI, same property price
• Net: $15,000 ahead (the LMI she didn't pay)

Result: Waiting wins by exactly the LMI amount ($15,000).

Scenario 4: Market falls 5% per year

Option A: Buy now with LMI

• Buys at $800,000 + $15,000 LMI
• After 2.25 years, property worth ~$715,000
• Equity loss: −$85,000
• Net: −$85,000 − $15,000 LMI = $100,000 behind

Option B: Wait and save 20%

• Property now $715,000, 20% = $143,000
• She's saved $160,000 — has $17,000 surplus
• Buys cheaper, no LMI, extra cash buffer
• Net: ~$100,000 ahead relative to buying with LMI

Result: Waiting crushes buying early. The LMI loss is magnified by the falling market.

The break-even: when does LMI pay for itself?

The rough rule of thumb:

• Above ~3% annual growth: Paying LMI and buying sooner is almost always better
• 1-3% annual growth: LMI is likely worth it, but the margin is thin
• 0% growth: Saving more is better by exactly the LMI amount
• Negative growth: Waiting is clearly better

Australian property has historically averaged 6-7% annual growth over the long term (though with significant year-to-year variation). Over the last 30 years, the number of 2-3+ year periods with zero or negative growth has been relatively small — mostly the 2017-2019 correction and a brief COVID dip in 2020.

Hidden factors most people miss

Rent costs while waiting

If Sarah is renting while saving, she's paying rent that doesn't build equity. At $500/week, that's $58,500 in rent over 2.25 years. If she buys, some of her mortgage repayment builds equity (the principal component). This further favours buying sooner.

Interest on the larger loan

Buying with a smaller deposit means a larger loan. At 90% LVR vs 80% LVR, the loan is $80,000 larger. At 6.2% over 30 years, that $80,000 costs ~$97,000 in additional interest. This is a real cost that partially offsets the price-growth benefit.

Opportunity cost of the deposit

The extra $80,000 sitting in a savings account while you save earns interest. At 5%, that's $4,000/year. Not huge, but it reduces the cost of waiting slightly.

Stress and life factors

There's a non-financial benefit to owning your home sooner: stability, the ability to renovate, no landlord, and (for many people) reduced financial anxiety. These are real considerations that don't show up in a spreadsheet.

The decision framework

Use this as a guide:

1. Calculate your specific LMI cost using our LMI Calculator
2. Estimate how long it would take to save the additional deposit
3. Consider the market — is your target area growing, flat, or at risk of falling?
4. Factor in rent you'll pay while saving
5. Run both scenarios — what's your net position in 5 years under each option?

If you can save the remaining deposit in under 12 months, waiting usually makes sense. If it'll take 2+ years and you're in a growing market, paying LMI is likely the smarter move.

The bottom line

"Never pay LMI" is overly simplistic advice. LMI is a cost, not a scam. It gives you access to the property market earlier. Whether that access is worth the premium depends on one question: will the property grow by more than the LMI cost during the time you'd otherwise spend saving?

History suggests the answer is usually yes — but there are no guarantees, and anyone who claims to know what the market will do next year is guessing.