Under the new regulation, authorised deposit-taking institutions (ADIs) will be restricted in their issuance of home loans where the borrower's debt exceeds six times their income. Currently, approximately 6% of new loans surpass this threshold, with nearly half falling between four to six times the borrower's income. Notably, the cap will not apply to loans for new housing developments, aiming to support housing supply.

APRA Chair John Lonsdale emphasized the proactive nature of this measure, stating that introducing limits now will help mitigate risks stemming from high-risk lending and be less disruptive than waiting. The Australian banking sector's substantial exposure to residential mortgages makes it particularly susceptible to housing-related shocks, necessitating such preemptive actions.

This policy shift aligns Australia with international counterparts like New Zealand and Canada, which have implemented similar measures to manage housing market risks. The decision follows recent interest rate cuts and government incentives for first-home buyers, which have contributed to record property prices and an 18% surge in investor loans in the last quarter.

For prospective borrowers, this development underscores the importance of maintaining a manageable debt-to-income ratio. Lenders will likely scrutinize applications more rigorously, particularly for those seeking loans that would result in higher DTI ratios. Borrowers should be prepared for potentially stricter lending criteria and consider how their income levels and existing debts may impact their loan eligibility.

In summary, APRA's forthcoming cap on high DTI home loans represents a strategic effort to safeguard the financial system and promote sustainable lending practices. Prospective homebuyers and investors should stay informed about these changes and assess their financial positions accordingly to navigate the evolving lending landscape effectively.