The Reserve Bank of Australia is preparing for a wave of defaults in the private credit market, warning that the sector's rapid expansion has created vulnerabilities that could spread quickly through the broader financial system.

Internal documents obtained by the Australian Financial Review indicate the central bank is particularly concerned about the concentration of risk within lender portfolios, which could exacerbate any financial shock originating in the industry.

The RBA’s assessment highlights a growing divergence between the traditional banking sector and the alternative lending market.

As private credit funds have ballooned in size, they have become increasingly interconnected with local financial institutions.

The central bank fears that a downturn in this opaque sector could trigger contagion effects, especially given the lack of standardized disclosure and the high concentration of assets held by a limited number of lenders.

This warning comes as the RBA intensifies its scrutiny of the financial stability landscape.