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Australian Lending Policy Reference

How Existing Debts Affect Servicing

How existing debts are assessed in a mortgage application — including how repayments are stressed at a higher rate and why the assessed commitment differs from the actual repayment.

Vetted and updated: 2026ACL 387460 Vetted

Core Assessment Analysis

Existing mortgages are stressed at ~3% above their actual interest rate when banks calculate your capacity. For example, if you pay 6.0% on an existing $600,000 mortgage, the bank assesses your commitment at 9.0% on a principal and interest basis over the remaining term. Furthermore, unused credit cards are calculated as a virtual ongoing liability at ~3% of their limit, regardless of whether your balance is $0.

Why Underwriters Focus Here

Banks must stress all household debt liabilities to protect against systemic defaults during rate hikes.

Key Outcome Assessment Factors

Your total credit card limits, existing investment loan structures, and pre-tax HECS tax deductions.

Your pathway from here
General Information Only

Reducing or closing unused credit card limits is the fastest way to boost borrowing capacity.

Model Mortgages Pty Ltd | Australian Credit Licence 387460

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How Borrowing Capacity Is Calculated