APRA's DTI Cap: What It Means for Growing a Property Portfolio

From 1 February 2026, the Australian Prudential Regulation Authority (APRA) has limited how much high-leverage mortgage lending a bank can write. No more than 20% of a bank's new mortgage lending, measured separately for owner-occupiers and investors, can go to borrowers whose total debt sits at six times their annual income or more. For an investor building or expanding a multi-property portfolio, the detail that matters is what kind of limit this actually is.

What the Cap Actually Says

The measure was announced by APRA on 27 November 2025 and took effect on 1 February 2026. Each authorised deposit-taking institution must keep new lending at a debt-to-income (DTI) ratio of six times or more to 20% of its total new mortgage lending, with owner-occupier and investor books counted separately.

Two categories are exempt: bridging loans for owner-occupiers, and loans for the purchase or construction of new dwellings. Smaller ADIs get proportionate treatment.

A Limit on the Bank, Not on You

This is the part investors most often misread. The cap does not set a personal borrowing ceiling of six times your income. It caps the share of a bank's total new lending that can sit above that ratio.

APRA's own guidance on the mechanism is explicit about how a bank manages this in practice. According to its explainer on activating debt-to-income limits, lenders have flexibility in how they stay within the cap:

• Approve a new high-DTI application if the bank still has quota left for that quarter.
• Defer or decline further high-ratio applications once the quarter's quota is used, even where the borrower otherwise passes normal serviceability checks.
• Offer a borrower a lower-leverage loan structure instead.
• Direct a borrower toward a different lender that still has headroom.

Compliance is measured quarterly for larger banks, with a four-quarter rolling measure for smaller ADIs. A loan that would have been approved early in the quarter can be knocked back later simply because the bank's quota has filled.

How This Differs From the Serviceability Buffer

It is easy to conflate this cap with the separate 3 percentage point mortgage serviceability buffer, which APRA has run for years and kept unchanged at its most recent review. The two rules do different jobs, and both apply to you at once.

The buffer is applied to every individual application: your ability to repay is tested at an interest rate 3 percentage points above the actual rate on offer. The DTI cap operates one level up, at the bank's whole lending book, limiting how much of it can sit above a six-times-income ratio. Passing the buffer test does not guarantee a high-DTI loan gets written if the bank's quota for the quarter is already full.

Where the Cap Currently Sits

At its most recent review, published 28 May 2026, APRA confirmed both the buffer and the DTI limits unchanged, and reported high-DTI lending remained well below the 20% limit at an aggregate, industry-wide level. That figure is an average across the whole banking system, not a picture of any one lender's book.

A bank that has taken on a run of highly leveraged investor loans this quarter can sit much closer to its own limit than the industry average suggests, and that is the lender whose behaviour affects your next application.

What This Means for Expanding a Portfolio

For an investor adding a third, fourth or fifth property, the practical effect is less about whether you can borrow at all and more about timing and choice of lender. A few things follow directly from how the cap works:

• Ask your broker or lender directly how much headroom they currently have left in the quarter for high-DTI lending, not just whether you pass their standard serviceability test.
• Spread a run of highly leveraged purchases across more than one lender rather than relying on a single bank to absorb all of them in the same reporting period.
• Expect more variability in approval timeframes and outcomes for high-leverage applications than in previous years, since a lender managing its quota may sit on a decision or push it to the next quarter.
• Consider whether a lower-leverage structure on one property, freeing up serviceability elsewhere, keeps your overall borrowing further from any single lender's limit.

None of this changes the underlying economics of a highly leveraged portfolio. It changes which lender can say yes, and when, which matters if your settlement timeline is tight.

Talk to Us Before You Structure Your Next Purchase

How the cap interacts with your own borrowing depends on your existing debt and how concentrated your next few purchases are. We cannot advise on an individual's borrowing position in an article, but we can work through the structuring and timing questions with you directly. Speak to us about your circumstances before your next acquisition.

Disclaimer: This article contains general information only and does not constitute financial, legal or tax advice. It has been prepared without regard to your objectives, financial situation or needs. Tax and superannuation laws change frequently, and the information in this article may not reflect the current law or may become inaccurate over time. Before acting on anything in this article, you should consider its appropriateness to your circumstances and seek advice from a registered tax agent or qualified adviser.