How Lenders Calculate Your Borrowing Capacity
Ever wondered how banks decide how much you can borrow? Here's an inside look at the assessment process.
Raj Bhangu
Principal Mortgage Broker
Key Takeaways
- 1Lenders assess PAYG salary plus overtime/bonuses; self-employed uses average of 2 years net profit
- 2Rental income typically counted at 80% of gross rent
- 3Buffer rate: lenders add 3% to current rate when assessing affordability
- 4Maximize borrowing: reduce credit card limits, pay off personal loans, close unused BNPL accounts
Understanding how lenders assess your borrowing capacity can help you prepare better and potentially increase the amount you can borrow.
Income Assessment
Lenders look at your gross income from all sources:
- PAYG employees: Base salary plus regular overtime, bonuses, and allowances
- Self-employed: Usually the average of the last 2 years' net profit
- Rental income: Typically 80% of gross rent is counted
- Other income: Dividends, government payments, etc.
Expense Assessment
Lenders use either your declared expenses or the Household Expenditure Measure (HEM), whichever is higher. They'll review your bank statements for:
- Living expenses
- Existing loan repayments
- Credit card limits (even if not used)
- BNPL services
The Buffer Rate
Lenders add a buffer (typically 3%) to the current interest rate when calculating if you can afford the loan. This ensures you can still make repayments if rates rise.
Example: If the loan rate is 6%, they'll assess at 9% to ensure you can handle potential rate increases.
Tips to Maximize Borrowing Capacity
- Reduce credit card limits (or close unused cards)
- Pay off personal loans and car loans
- Close unused BNPL accounts
- Minimize discretionary spending before applying
- Consider a longer loan term (though this increases total interest)
Want to know your borrowing power? Use our borrowing calculator for an estimate, or speak with us for a more accurate assessment.
Related Tool
Borrowing Power Calculator
Put the theory into practice, calculate your actual borrowing capacity.
Sources & References
This article references information from the following authoritative sources:
Raj Bhangu
Principal Mortgage Broker
Expert mortgage broker helping Australians achieve their property dreams with personalized home loan solutions.
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As a mortgage broker, iSmart Finance receives commissions from lenders when we successfully arrange a home loan. This does not affect the interest rate or fees you pay. Our service is free for you, and we're committed to finding the best loan for your needs.
About iSmart Finance
iSmart Finance Group ACN 608 986 554 is Credit Representative 481761 of BLSSA Pty Ltd ACN 117 651 760 (Australian Credit Licence 391237). We are members of the Finance Brokers Association of Australia (FBAA) and comply with the National Consumer Credit Protection Act 2009.
Our content is based on industry expertise, regulatory guidelines from ASIC and APRA, and data from the Reserve Bank of Australia. All information is current as of the publication date and subject to change.
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