APRA Holds the 3% Buffer, Flags New Limits on High-DTI and Investor Lending

The Australian Prudential Regulation Authority, known as APRA, has decided to leave its main lending safeguards unchanged. The mortgage serviceability buffer stays at 3 percentage points, and the countercyclical capital buffer stays at its default setting of 1% of banks' risk-weighted assets. On the surface that sounds like a quiet, no-change announcement. The detail underneath is more interesting, and it matters if you are planning to buy or refinance.

Alongside holding those settings, APRA signalled that it will shortly begin talking to banks about adding new tools to manage the risks in home lending. Specifically, it pointed to possible limits on new high debt-to-income lending, and possible limits on new investor or interest-only loans. Nothing has changed today, but the direction of travel is now on the record. Below we explain what was decided, why, and what it could mean for your borrowing power.

What APRA actually announced

Two things stayed put. The first is the serviceability buffer, which sits at 3 percentage points. The second is the countercyclical capital buffer, held at its default 1% of risk-weighted assets. That capital buffer is a behind-the-scenes setting about how much capital banks must hold, so it does not directly change your loan application. The serviceability buffer is the one that touches you most directly.

The more forward-looking part of the announcement was APRA flagging that it will soon engage with lenders on additional macroprudential measures. The two named possibilities are caps on new high debt-to-income lending, and caps on new investor or interest-only loans. These are not in force. They are a signal that APRA is preparing the ground, and that some borrowers may face tighter rules in future.

Why APRA is being cautious

APRA pointed to high levels of household debt and to total credit growth running above its longer-run average. It also noted that credit growth is expected to rise further as and when interest rates eventually come down, because cheaper money usually means people borrow more. In plain terms, the regulator wants to keep a lid on risky lending before any future rate cuts pour fuel on it.

It is worth separating the two main authorities here, because they are often confused. APRA sets the rules that banks must follow when they lend, including the serviceability buffer. The Reserve Bank of Australia, the RBA, sets the cash rate, which influences the actual interest rate on your loan. You can follow movements in the cash rate on our RBA cash rate tracker. The two work in different ways, and this announcement was about lending rules, not the cash rate itself.

How the 3% buffer affects your borrowing power

The serviceability buffer is simpler than it sounds. When a lender assesses your application, it does not test whether you can manage repayments at today's interest rate. It tests whether you could still cope if your rate were roughly 3 percentage points higher. So if your loan rate is around 6%, the bank checks your budget against repayments at about 9%. That cushion is designed to protect you, and the bank, if rates rise or your circumstances change.

The catch is that a higher assessed rate caps how much you can borrow. With the cash rate at 4.35% after three increases in 2026, loan rates are already elevated, and adding 3 percentage points on top pushes assessed rates higher still. The result is that borrowing capacity is tight for many households right now. If you want to understand the mechanics in more depth, our guide on how much you can borrow in Australia walks through the calculation step by step, and you can run your own numbers with the borrowing power calculator.

What new DTI or investor caps could mean

If APRA does move ahead with limits on high debt-to-income lending, the borrowers most affected would be those trying to borrow a large multiple of their income. A debt-to-income cap puts a ceiling on total borrowing relative to earnings, so some applicants who currently scrape through could find their maximum loan reduced.

Limits on new investor or interest-only loans would land more squarely on property investors and on anyone relying on interest-only repayments to make the sums work. Again, none of this is in place yet. But if you are an investor, or you are stretching to the top of your capacity, it is sensible to plan as though conditions could tighten rather than loosen.

What it means for you

The headline today is that nothing has changed, but the warning shot has been fired. For most buyers and refinancers, the practical response is the same: get a clear, current picture of your real numbers rather than relying on an old estimate. A few concrete steps:

• Refresh your pre-approval. Pre-approvals expire and lending rules can shift, so an up-to-date approval gives you a realistic budget. Our guide to home loan pre-approval in Australia explains how the process works.
• Know your real number. Use the borrowing power calculator to see roughly what you can borrow under today's assessed rates, then treat that as your working ceiling.
• Think about loan structure early. If you are weighing certainty against flexibility, our fixed versus variable rate guide can help you decide what suits your situation.
• Talk to a broker. A good broker can tell you how different lenders apply the buffer and where any future caps might bite. See our guide on how to choose a mortgage broker.
• Plan for tighter, not looser. If you are an investor or borrowing near your limit, build a little headroom now so a future change in the rules does not derail your plans.

There is no need to rush or panic. APRA holding its settings means the rules you are borrowing under today are stable. The smart move is simply to understand those rules clearly, keep your paperwork current, and stay informed as the conversation between APRA and the banks develops over the coming months.