Borrowing power
What lenders include in serviceability
A practical guide to the income, debts, expenses, buffers, and living-cost assumptions that shape borrowing capacity.
5 min read · Updated 30 May 2026
Serviceability is the lender's test for whether your household can reasonably afford a loan. It is not just your salary. Lenders look at the full picture: income, commitments, living expenses, dependants, buffers, and the structure of the loan you want.
Key takeaways
- Serviceability is the lender's test for whether the proposed loan remains affordable after income, expenses, debts and buffers are included.
- Credit-card limits, dependants and existing commitments can reduce capacity even when headline income looks strong.
- Preparing a clean Fact Find before applying helps reveal which lender policies may suit the borrower.
The core question
A serviceability assessment asks whether you can meet repayments now and if conditions change. Lenders typically model your proposed loan repayments at a higher assessment rate than the advertised rate, then compare that against income, expenses, and other commitments.
This is why two borrowers with the same income can receive different borrowing-capacity results. The mix of debts, dependants, credit cards, spending patterns, and loan structure matters.
What usually goes in
Each lender has its own policy, but most assessments include a consistent set of inputs.
- Income: salary, wages, overtime, bonuses, commissions, rental income, business income, government payments, and investment income, depending on lender policy.
- Existing debts: personal loans, car finance, credit cards, buy-now-pay-later limits, HECS/HELP obligations, investment loans, and existing mortgages.
- Living expenses: declared household spending, often compared with benchmark living-expense assumptions.
- Household profile: number of applicants, dependants, relationship status, and living situation.
- Loan details: loan amount, term, repayment type, interest-only periods, rate type, and whether the loan is owner-occupied or investment.
- Buffers: a stressed repayment rate or serviceability margin to test whether repayments remain affordable if rates rise.
Why credit limits can reduce borrowing power
A common surprise is that a credit card limit can affect borrowing capacity even if the balance is low. Lenders often assess the potential repayment commitment based on the available limit, not just today's balance.
Reducing unused credit limits, paying down personal debts, and clarifying actual living expenses can materially improve a serviceability result.
How to prepare before applying
Before speaking with a broker or lender, build a clean picture of your income, debts, expenses, deposit, and goals. That does not mean dressing up the numbers. It means understanding them clearly enough to see what is helping or hurting your position.
Borro is designed around that preparation step: a structured Fact Find, readiness signals, document preparation, and scenario modelling before the formal application process begins.
See how lender serviceability affects your number.
Start with a borrowing-power assessment before choosing where to apply.
Check my borrowing powerFrequently asked questions
Serviceability is a lender's assessment of whether you can afford repayments after income, expenses, debts, dependants, and buffers are considered.
Each lender uses different policy settings for income, expenses, debts, credit-card limits, and assessment rates.