Australia’s non-bank lenders are raising mortgage funding at unprecedented scale. A single issuer priced $3 billion of residential mortgage-backed securities this month, the largest RMBS transaction by an Australian non-bank on record. That same week, another non-bank closed a $1.2 billion deal. Across the calendar year, RMBS volume is tracking toward a record, with more than $60 billion already priced before year-end.
The question for borrowers and brokers: does bigger funding mean cheaper rates, or just more capacity to write loans at the same margin?
What RMBS does for non-banks
Residential mortgage-backed securities let non-bank lenders convert mortgage assets into tradeable bonds, selling them to institutional investors in Australia and offshore. The cash raised funds new lending. Non-banks typically rely on a mix of warehouse lines from major banks and RMBS issuance to grow their loan books.
When a lender can price a large RMBS transaction, it signals two things: the loan book is performing well enough to attract capital, and the lender has enough origination volume to justify the deal size. Low arrears, stable refinance activity and rising property values all help.
The bigger the deal, the more firepower the lender has to write new loans, expand product range and chase market share. But the funding cost itself depends on investor demand, prevailing credit spreads and the quality of the underlying mortgages.
The funding arithmetic
Non-banks price RMBS in tranches, with senior notes sold at the tightest spreads and subordinated notes carrying more risk and higher yield. Investor appetite determines the final pricing. When demand is strong, spreads compress and funding costs fall. When demand softens, the issuer either pays more or scales back the deal.
Right now, Australian credit markets are stable. Geopolitical risk is lower than in other jurisdictions, the regulatory environment is predictable, and mortgage arrears remain near historic lows. That mix brings offshore buyers from Japan, the UK and the US, chasing yield and diversification.
But pricing a $3 billion RMBS does not automatically translate to cheaper mortgage rates for borrowers. The lender’s cost of funds improved, but competition, credit risk appetite and margin targets determine the final rate offered to customers. If origination volumes are strong and warehouse capacity is full, a large RMBS deal simply maintains supply rather than lowering price.
Who benefits when deals hit record size
Brokers see more lending capacity when non-banks securitise at scale. More funds available means faster approval pipelines, more appetite for complex credit and potentially more flexible policy settings. Over half of one lender’s originations come through broker channels, so larger RMBS issuance directly supports broker deal flow.
Borrowers benefit indirectly if increased competition forces non-banks to sharpen their rates or broaden their product set. But that depends on how tight the funding market is. When all non-banks can access capital easily, the rate advantage narrows.
Investors get predictable cashflows from a stable, low-arrears asset class. Rising property values and strong refinance activity mean principal repays on schedule. The downside: if interest rates stay elevated and refinance activity slows, prepayment speeds drop and duration risk increases.
The catch
- RMBS funding is cheaper than equity, but it locks the lender into asset performance. If arrears tick up or property values stall, the next deal prices wider or smaller.
- Larger deals attract more scrutiny. Investors will pull back if underwriting standards soften or if loan-to-value ratios drift higher.
- Non-banks can issue billions of RMBS and still charge the same rates if demand for mortgages stays strong. More funding capacity does not equal lower borrower costs unless competition forces it.
Pressure points over the next six months
Interest rate settings remain the main risk. The RBA held rates steady recently, but inflation pressures and offshore rate moves could force another tightening cycle. Higher rates slow refinance activity, reduce prepayment speeds and stretch borrower serviceability.
Regulatory changes to lending standards or tax treatment of residential property could also shift demand. If borrower appetite cools, non-banks with large loan books and fixed funding costs face margin compression.
The major banks are tightening credit policy, which creates space for non-banks to grow. But if the majors ease again, non-banks lose their competitive edge and funding costs matter more.
Scenarios: base, stress, opportunity
Base case: RMBS issuance stays elevated through 2025, non-banks maintain market share near current levels, funding costs remain stable, mortgage rates drift slightly lower as competition increases.
Stress case: interest rates rise again, refinance activity drops sharply, arrears tick up, investors demand wider spreads, non-banks either pay more for funding or scale back origination.
Opportunity case: RBA cuts rates in 2025, refinance volumes surge, non-banks capture share from major banks, funding costs fall as investor demand strengthens, mortgage rates compress across the board.
What this means if you’re borrowing or refinancing
Non-bank lenders now have significant funding capacity. If you’re refinancing, compare non-bank rates against major bank offers. The gap has narrowed in recent months, but non-banks often move faster on approval and offer more flexibility on credit policy.
If you’re a broker, track which non-banks are issuing RMBS and when. A large deal usually signals appetite for new originations and faster turnaround on applications. Non-bank lender funding hits $1.2bn as securitisation keeps pace with mortgage slowdown covers how funding cycles affect rate competitiveness.
Watch for rate movements in the 30-60 days after a large RMBS transaction. That’s when lenders adjust pricing to deploy the new capital.
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General info, not financial advice.
