Lending Tools

Borrowing Power Calculator

Enter your income and expenses — see how seven lenders compare, using each bank's current assessment rate, living expense floors, and credit card treatment. Lenders are colour-coded only.

Your situation

Loan purpose

DTI speed limits: 6× owner-occupied, 7× investment.

Household type
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Exclude rent/mortgage. Each bank applies its own expense floor.

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Card limit is counted as a monthly commitment. Debt balance reduces your DTI ceiling.

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Bank-to-bank range
DTI ceiling
Criteria sourced from each lender's current broker serviceability calculator. Rates change regularly — contact Trebla for a tailored assessment.
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How it works

Every bank calculates differently. That's why the gap matters.

Each lender uses their own assessment rate, minimum living expense floor, and credit card treatment. The result: the same household can borrow significantly more from one bank than another — sometimes $80,000 or more.

Assessment rate

Banks don't test your affordability at today's market rate. They apply a higher stress rate — typically 6.5–7.0% — to ensure you can still afford repayments if rates rise. Each lender sets their own floor, which is why the same income produces different results.

Why it matters: A 0.15% difference in assessment rate changes maximum borrowing by roughly $10,000–$15,000 on a $700k loan.

Living expense floors

Every bank applies a minimum monthly expense figure regardless of what you declare. These floors — based on household size — vary meaningfully between lenders. Your disclosed expenses only count if they're higher than the floor. Otherwise the bank substitutes their minimum.

The hint: If you see "Bank minimum applied" under expenses, that bank is using their floor — not your number.

Credit card treatment

Banks treat credit card limits as if you'd drawn the full balance and are repaying it monthly. The monthly commitment percentage applied to your limit varies by lender — meaning a $10,000 card limit reduces borrowing power by different amounts at different banks.

Reducing or cancelling unused credit cards before applying is often the single fastest way to lift your borrowing capacity.

What this calculator doesn't include

Banks also assess credit history, employment type and stability, LVR tier, and the specific property. Each lender may apply additional overlays for self-employed income, commission, bonuses, or rental. The gap between this calculator and a real pre-approval can be significant for complex situations.

We run full assessments across the whole market at no cost. Talk to our team →

Results are indicative only. Lending decisions involve criteria beyond what this calculator models. Book a free chat with our team for a proper borrowing assessment.

Want to know which bank to go with?

The calculator shows the ceiling — we know which lender will actually approve your deal and on what terms. One conversation, seven lenders compared.