APRA's 3% Serviceability Buffer: Why It Limits Your Borrowing, And What Might Change

If a lender has ever told you that you can borrow less than you expected, the APRA serviceability buffer is almost certainly the reason. It is the single most influential factor limiting home loan approvals in Australia, and it is currently at its highest-ever level of 3 percentage points above your actual loan rate.

What Is the Serviceability Buffer?

APRA (the Australian Prudential Regulation Authority) requires all regulated lenders, banks, credit unions, and building societies, to assess whether you can afford your loan not at your actual interest rate, but at your actual rate plus a minimum 3%. This "buffer" tests whether you could still make repayments if rates were to rise significantly after you take out the loan.

In practice, this means:

• If your home loan rate is 5.50%, lenders assess your repayments as if the rate were 8.50%
• If your rate is 4.35%, the assessment rate is 7.35%
• If your rate is 6.00%, the assessment rate is 9.00%

At 9% instead of 6%, your monthly repayment on the same loan is dramatically higher, and if your income cannot support that hypothetical repayment, the lender must decline or reduce the loan.

How Much Does the Buffer Actually Reduce Your Borrowing Power?

For most borrowers, the 3% buffer reduces maximum borrowing capacity by approximately 20–25% compared to what they could theoretically service at their actual rate. Here is a worked example:

	Without buffer (actual rate 5.5%)	With 3% buffer (assessed at 8.5%)
Household income	$150,000	$150,000
Monthly living expenses (HEM)	$3,200	$3,200
Maximum borrowing (30-year loan)	~$870,000	~$650,000
Reduction due to buffer	~$220,000 (25%)

That $220,000 gap is the buffer at work. It is not a negotiating number, it is a regulatory requirement that every APRA-regulated lender must apply.

History of the Buffer: How We Got to 3%

Period	Buffer requirement	Context
Pre-2019	2% above actual rate, minimum floor of 7%	APRA's original combined floor-and-buffer approach
July 2019	2.5% above actual rate, floor removed	APRA removed the 7% floor as rates fell
October 2021	3% above actual rate	APRA increased buffer to cool the booming 2021 property market
2026 (current)	3% (under review)	Senate inquiry underway; multiple economists recommend reduction

The October 2021 increase was explicitly designed to slow the property market and reduce systemic risk during a period of record-low rates. With the cash rate now at 4.35%, significantly higher than when the 3% buffer was set, some argue the buffer overcorrects: borrowers at 5.5% variable are being tested at 8.5%, which no one expects rates to reach.

The Current Debate: Should APRA Reduce the Buffer?

In 2026, a Senate Standing Committee on Economics inquiry examined the buffer's impact on housing affordability. Key findings and positions include:

• Property Council of Australia: Recommended reducing to 2% to improve affordability access
• REIA (Real Estate Institute of Australia): Advocated for a 1% buffer reduction
• RBA: Has noted the buffer contributes to housing affordability constraints
• APRA: Maintains the buffer is a systemic risk tool, not an affordability tool, and that a reduction would require confidence that systemic risks have materially diminished
• Treasury: Has flagged reviewing macroprudential settings as part of the broader housing policy response

No formal change had been announced as of May 2026, but the political pressure is significant. Both major parties have acknowledged housing affordability as a primary policy challenge.

What Happens If the Buffer Is Reduced to 2.5%?

If APRA reduces the buffer from 3% to 2.5%, the impact for the same borrower above would be:

	3% buffer (current)	2.5% buffer (proposed)
Assessment rate	8.50%	8.00%
Maximum borrowing ($150k income)	~$650,000	~$690,000
Increase in borrowing capacity	~$40,000

For couples or higher-income borrowers, the increase would be proportionally larger, potentially $60,000–$100,000 of additional borrowing power.

What Can You Do About It Right Now?

While the buffer is fixed by regulation, there are legal ways to improve your position:

• Reduce existing debts and credit card limits, Every $10,000 of credit card limit reduces your borrowing power by approximately $30,000–$40,000 under assessment.
• Maximise assessable income, Bonuses, overtime, rental income, and government benefits can be assessed at varying rates depending on the lender. A broker finds the lender with the most favourable income policy for your situation.
• Consider non-bank lenders, Some non-ADI (non-APRA-regulated) lenders apply a 2.5% buffer or alternative assessment methods. This is legal and may be appropriate for some borrowers. Risk must be understood and disclosed.
• Offset accounts, Holding savings in an offset reduces your loan balance and therefore the repayment assessed under the buffer.
• Use a broker, Different lenders assess income, expenses, and the HEM benchmark differently. A broker using multiple lenders can identify which institution's policy gives you the highest approval amount under current APRA rules.

Use our Borrowing Power Calculator for an initial estimate, then speak to a broker who can show you the difference across multiple lenders. You can also use our Mortgage Stress Calculator to see exactly how rate changes affect your monthly repayments.