Over the past few years, the fastest-moving part of Australia’s housing market hasn’t been prestige suburbs or luxury homes — it’s the lower end. Economists call it the 25th percentile, or P25 — the price point below which 25 per cent of homes sell.

In simple terms, it’s the entry-level market, where first-home buyers, young families, and early investors compete for the same limited stock.

In 2024, this was the strongest-performing segment nationally. And with the government’s expanded 5 per cent Deposit Home Guarantee, that pressure looks set to build again.

What the Scheme Actually Does

The Home Guarantee program allows eligible buyers to purchase a property with just a 5 per cent deposit and no Lender’s Mortgage Insurance (LMI). The government guarantees the remaining 15 per cent, so the bank treats the buyer as if they’d put down the full 20 per cent.

That sounds like a shortcut to ownership — and for individual buyers, it is. However, on a macro level, it simply expands demand without adding a single new dwelling to supply.

How LMI Works — and Why It Matters

LMI doesn’t protect you; it protects the lender if you default and the sale of your home doesn’t cover the loan. It’s required whenever your deposit is below 20 per cent.

Buyers usually have two choices:

1. Save a 20 per cent deposit and avoid LMI altogether, or
2. Buy sooner with a smaller deposit (often 10 per cent) and pay LMI, which typically costs 1–3 per cent of the property price.

The government scheme removes that trade-off: you can now buy with a 5 per cent deposit and skip LMI entirely.

How Much Buying Power It Adds

If we compare the scheme to the most common alternative — a buyer who would have purchased with a 10 per cent deposit and paid LMI — the uplift equals the 5 per cent smaller deposit plus the avoided LMI premium of roughly 2 per cent.

That’s about a 7 per cent increase in effective purchasing power.

Seven per cent might not sound dramatic, but in a tight market dominated by first-home buyers, that’s enough to shift price brackets and bidding behaviour — especially in the lower quartile.

Where It Hits Hardest

Most participants won’t buy right up to the scheme’s price caps; they’ll be active below them, which is exactly where the 25th percentile sits.

Approximate P25 ranges:

• Sydney – $700,000 to $900,000
• Melbourne – $600,000 to $700,000
• Brisbane – $550,000 to $700,000

When close to a third of buyers suddenly have around 7 per cent more borrowing power, the competitive pressure lands squarely in these brackets.

Estimated Buying-Power Uplift by City

City	Scheme Cap	Deposit Saving (5%)	Typical LMI Saving	Total Boost in Capacity
Sydney	$1.5m	$75,000	~$30,000	≈ 7%
Melbourne	$950k	$47,500	~$19,000	≈ 7%
Brisbane	$1.0m	$50,000	~$20,000	≈ 7%
Adelaide	$900k	$45,000	~$18,000	≈ 7%
Perth	$850k	$42,500	~$17,000	≈ 7%
Hobart	$700k	$35,000	~$14,000	≈ 7%
Canberra	$1.0m	$50,000	~$20,000	≈ 7%
Darwin	$600k	$30,000	~$12,000	≈ 7%

While the percentage is similar across capitals, the dollar amount grows with property value — and the psychological anchor of each city’s cap tends to cluster demand just below those limits.

The Politics of “Affordability“

Back in 2003, Prime Minister John Howard summed up the politics of housing in one sentence:

“I haven’t found anybody in seven and a half years shake their fist at me and say, ‘Howard, I’m angry with you for letting the value of my house increase.’”

That line still rings true. Rising house prices make most voters feel wealthier — and around two-thirds of Australian households (≈ 67%) already own a home.

When most voters benefit from rising values, governments have little incentive to deliver policies that would cause prices to fall. So instead, every “affordability” initiative — whether it’s a grant, a tax break, or a deposit guarantee — ends up boosting demand, not supply.

The Affordability Paradox

Here’s the paradox: the very schemes designed to improve affordability often make it worse in the long run.

By helping buyers stretch further, they lift prices across the entry-level segment — the part of the market they’re meant to make more accessible. What starts as a helping hand becomes a ratchet that permanently resets the starting point higher.

Each round of intervention ends up chasing the effects of the last one, while true supply-side reforms — faster planning approvals, zoning flexibility, and infrastructure investment — remain politically harder and slower.

History Keeps Repeating

We’ve seen it before. The First Home Owner Grant, the post-GFC incentives, and the pandemic-era HomeBuilder program all produced the same pattern:

1. A burst of new demand.
2. Entry-level prices jump 5–10%.
3. Affordability erodes again within 12–18 months.

Each cycle leaves prices higher than the one before, creating the illusion that something new must be done to “fix” affordability.

Where It Leaves Us

The 5 per cent Deposit Home Guarantee doesn’t make housing more affordable — it just boosts prices, and most of the value accrues to those who sign up first.

By giving buyers about 7 per cent more purchasing power, it amplifies competition in the 25th-percentile segment — the most price-sensitive part of the market.

For investors, that means the floor of the market continues to rise.

For policymakers, it’s a reminder that you can’t fix a supply problem with demand money, and that paradoxically, the very policies designed to make housing more affordable are the ones that keep pushing it further out of reach.

And politically, as long as two-thirds of voters already own a home, no one in Canberra is likely to lose sleep over that.