Your debt-to-income ratio (DTI) is your total debt divided by your gross annual income. For example, $60,000 of debt on a $100,000 income is a DTI of 0.6. It's a useful health check, but most Australian car lenders focus more on monthly serviceability: whether your income covers expenses and all repayments with room to spare.
How DTI fits in
- DTI limits are most prominent in home lending, where high DTIs attract extra scrutiny.
- For car loans, a very high DTI, often driven by a big mortgage, can still limit options or trigger extra checks.
- Monthly surplus is usually the deciding factor.
Monthly view: what lenders really check
- After-tax income
- Minus living expenses (yours or the lender's benchmark, whichever is higher)
- Minus all existing repayments, including an assumed amount on card limits
- = the surplus available for the new car loan
How to improve both
- Close or reduce unused credit card limits.
- Pay off small debts, BNPL and personal loans.
- Avoid new debt before applying.
- Use a deposit to reduce the car loan amount.
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General information only. This isn't financial advice. Finance the Ride is a referral service and doesn't hold an Australian Credit Licence. Last reviewed September 2026.