RMBS are financial instruments backed by residential mortgages, allowing lenders to raise capital by selling these securities to investors. The proceeds from such issues enable lenders like Firstmac to continue offering competitive home loan products to consumers.

Firstmac's record-breaking RMBS issuance is indicative of the growing prominence of non-bank lenders in Australia's mortgage market. These institutions often provide more flexible lending solutions compared to traditional banks, catering to a diverse range of borrowers, including those who may not meet the stringent criteria of major banks.

For borrowers, this development could translate into more competitive mortgage rates and a wider array of loan products. The increased liquidity from such substantial RMBS issues allows non-bank lenders to expand their offerings and potentially lower borrowing costs.

However, it's essential for consumers to conduct thorough research and consider their financial circumstances when selecting a mortgage product. Consulting with financial advisors and comparing offerings from various lenders can help in making informed decisions.

In conclusion, Firstmac's $2.5 billion RMBS issue not only sets a new record but also highlights the evolving dynamics of Australia's mortgage market. As non-bank lenders continue to gain traction, borrowers may benefit from increased competition and more tailored lending solutions.