iscover 
The Australian Prudential Regulation Authority’s (APRA) latest Monthly Authorised Deposit-taking Institution Statistics have found that the big four banks lifted balances by $18.3 billion in housing investment loans from November 2024 to November 2025.
Now with a balance of $211.7 billion, this represents the largest increase in dollar terms at 9.5 per cent growth.
Across the sector, Australia’s investor mortgage market has expanded to a new high, with total outstanding housing investment loans reaching $778.1 billion in November 2025, according to APRA’s data.
This represents an increase of about $51 billion over the year, equivalent to around 7 per cent growth between November 2024 and November 2025. After surging during 2021, investor lending slowed through 2022–23, before returning to robust growth over the past year.
Following the Commonwealth Bank of Australia (CBA), Macquarie Bank stood out for the speed of its expansion, growing its investor mortgage portfolio from $49.1 billion to $61.9 billion over the year. This represents an increase of $12.8 billion, or 26 per cent, making it the fastest-growing large lender in the investor segment.
The remaining major banks posted more modest gains. Westpac increased investor loans by $6.4 billion, from $161.3 billion to $167.7 billion, a rise of 4 per cent.
ANZ lifted its investor book by $4.5 billion, from $102.3 billion to $106.8 billion, an increase of 4.4 per cent, while NAB added $4.1 billion, growing from $109.3 billion to $113.4 billion, or 3.8 per cent.
Several smaller lenders recorded much faster percentage growth from lower bases. ING Bank Australia grew its investor loan book by 36 per cent, from $11.3 billion to $15.4 billion, an increase of $4.1 billion.
Bank Australia expanded from $1.9 billion to $3.5 billion, an increase of $1.6 billion, equivalent to 81.8 per cent growth. However, much of this was driven by acquisitions, such as the merger with Qudos Bank.
A similar picture was played out in monthly growth. On a month-to-month basis, housing investment loans rose from $772.8 billion in October 2025 to $778.1 billion in November, an increase of $5.3 billion, or 0.7 per cent in a single month.
CBA again led in absolute terms, lifting its investor loan book by $2.3 billion in November to $211.7 billion, a 1.1 per cent increase over the month.
Macquarie Bank recorded the strongest momentum among large lenders, growing investor loans by $1.6 billion in a single month, or 2.7 per cent, to $61.9 billion.
Westpac added $1.2 billion in investor lending during November, taking its total to $167.7 billion, a 0.7 per cent monthly rise.
[Related: Judo Bank keeps growth on track as loan book expands]