The three buffers first-home buyers should not confuse

A smaller deposit can bring a first home within reach sooner. It does not make the home cheaper, reduce the mortgage or make the household safer after settlement.

Australia’s expanded 5% Deposit Scheme has helped separate the size of a deposit from the cost of lenders mortgage insurance. Since 1 October 2025, eligible first-home buyers have been able to buy with a deposit as small as 5 per cent. Places are uncapped and income caps have been removed. The Australian Government guarantees part of the loan to the participating lender, so eligible buyers do not pay lenders mortgage insurance under the scheme.

That solves an access problem. It does not replace the three buffers a buyer needs to protect the household: equity, spare cash and retirement savings.

Buffer one: the deposit protects equity

A 5 per cent deposit generally implies a starting loan-to-value ratio of about 95 per cent before transaction costs. Consider a simplified A$600,000 purchase:

• 5 per cent deposit: A$30,000
• starting loan: A$570,000
• property value after a 5 per cent fall: A$570,000

Before allowing for buying costs or principal already repaid, the property’s value and the loan balance would be roughly equal after that fall. A larger decline could leave the owner in negative equity, where the mortgage is greater than the property’s market value.

Negative equity does not automatically force someone to sell. A borrower who can keep making repayments may remain in the home and wait for the loan balance or property value to improve. The risk appears when life removes that flexibility: unemployment, separation, illness, relocation or an unaffordable change in repayments.

The scheme removes lenders mortgage insurance for an eligible buyer. It does not remove leverage or guarantee the value of the home.

Buffer two: serviceability is not spare cash

APRA confirmed in May 2026 that the mortgage serviceability buffer remains 3 percentage points . APRA-regulated banks must apply at least that buffer when assessing a new borrower’s capacity to repay.

Passing that assessment is useful, but it is not the same as having an emergency fund. A lender applies a model across income, expenses, debts and an assumed interest rate. Real household costs arrive unevenly: repairs, strata levies, council rates, insurance excesses, medical bills, parental leave, vehicle replacement and gaps between jobs.

Before committing the deposit, a buyer can ask:

• How much cash remains after the deposit and every buying cost?
• What would the repayment be if the interest rate rose by 3 percentage points?
• How many months of essential expenses would remain in cash?
• Could the household manage a temporary loss of one income?
• Are body-corporate fees and likely maintenance included?
• Would the first major repair need to go on a credit card or personal loan?

If reaching the deposit threshold empties every accessible account, the next problem is no longer the deposit. It is liquidity.

Buffer three: super protects the future household

The super guarantee rate is 12 per cent of qualifying earnings in 2026–27 . Super is intended for retirement, and early access is restricted.

The First Home Super Saver Scheme does not provide general access to compulsory super. It allows an eligible buyer to release qualifying voluntary contributions and associated earnings. The contribution limits are A$15,000 in one financial year and A$50,000 across all years. Compulsory super guarantee contributions made by an employer are not part of the eligible pool.

That boundary matters. It lets a buyer choose to build part of a deposit inside the concessionally taxed super system without routinely converting compulsory retirement savings into housing equity.

Broader access to super would involve a genuine trade-off. Buying sooner may avoid rent and provide earlier exposure to the housing market. Against that sit lost investment compounding and the possibility that extra purchasing power lifts prices when housing supply cannot respond quickly.

The outcome depends on age, income, future contributions, rent avoided, mortgage costs, the purchase price, investment returns, tax and how long the buyer expects to remain in the home. No single assumption settles the question for every household.

Three questions, not one

“Can I buy now?” is too narrow. A better decision separates three questions:

1. Access: Can I assemble the deposit and qualify for the loan?
2. Resilience: Can I carry the mortgage through a bad year without a forced sale?
3. Retirement: Do I still have a credible path to adequate long-term retirement savings?

A buyer can pass the first test and fail the other two.

The government guarantee and the bank’s approval are not personal recommendations. The guarantee reduces part of the participating lender’s credit exposure. The serviceability assessment applies a minimum capacity test. Neither one knows how much uncertainty, flexibility or financial pressure a particular household can comfortably accept.

A practical pre-purchase stress test

Use the actual property price and loan quote, not a generic borrowing calculator. Test the household budget under four conditions:

1. the quoted interest rate and that rate plus 3 percentage points
2. one income reduced or absent for several months
3. property-price declines of 5, 10 and 15 per cent
4. a major repair or special levy soon after settlement

Then include the costs that do not build equity: interest, council rates, insurance, strata fees, maintenance and the costs of buying and eventually selling.

The price-decline scenarios are not forecasts. They reveal how much freedom remains if the property cannot be sold without crystallising a loss. The income and repair scenarios test whether the household can keep the loan current while an adverse event passes.

If the plan works only when rates fall, both incomes continue without interruption, the property rises immediately and no major repair appears, the deposit is not the only thin buffer.

What can improve the position

Waiting for a 20 per cent deposit is not always the best answer. Delay has a cost in rent and can expose a buyer to further price rises. Australia’s wider housing problem also reflects slow supply, construction capacity and infrastructure constraints, as our analysis of migration, housing and labour capacity explains.

Improvements can be incremental:

• buy below the maximum amount the lender approves
• keep an accessible cash reserve outside the deposit
• choose a property with manageable ongoing costs
• make principal-and-interest repayments
• use an offset account where its costs and conditions suit the loan
• understand that refinancing can be harder while equity remains below 20 per cent
• make voluntary super contributions deliberately rather than assuming all super is accessible
• compare realistic buy-now and wait scenarios, including rent, transaction costs and the value of flexibility

The counter-signal is important: a buyer with stable income, substantial cash left after settlement, a long holding period and repayments well below their limit may be resilient even with a 5 per cent deposit. A small deposit is not proof that a purchase is unsafe.

Conditions that would change the view

The assessment should change when the facts change. A larger cash reserve, a lower purchase price, a second reliable income, lower ongoing property costs or a longer expected holding period can make an earlier purchase more defensible. Less secure income, a property with large known capital works, a budget dependent on rate cuts or a likely need to move soon should make the buyer more cautious.

The 5% Deposit Scheme can be a useful bridge into home ownership. It works best as an access tool, not as a substitute for equity, cash reserves or retirement planning.

Official guidance

• Australian Government home ownership support and the 5% Deposit Scheme
• Australian Government 5% Deposit Scheme details
• ATO guidance on the First Home Super Saver Scheme
• ATO super guarantee rates
• APRA’s May 2026 macroprudential settings
• Moneysmart guidance for mortgage hardship

General information only. It does not take account of your objectives, financial situation or needs. Consider independent financial, tax and legal advice before making a property or superannuation decision.