For prospective homebuyers, this policy means that obtaining a mortgage with a high DTI ratio may become more challenging. Lenders will need to adhere to the new cap, potentially leading to stricter lending criteria and more thorough assessments of borrowers' financial situations.

Existing mortgage holders with high DTI ratios should be aware that while the cap applies to new loans, it may influence refinancing options and the availability of additional credit. It's advisable for borrowers to review their financial positions and consider strategies to reduce their DTI ratios, such as increasing income or reducing existing debts.

APRA's decision underscores the importance of responsible lending practices and aims to prevent the accumulation of excessive household debt, which could pose risks to the broader economy. Borrowers are encouraged to seek financial advice to understand how these changes may affect their individual circumstances and to explore options for maintaining financial health in a changing regulatory environment.