First Home Buyer Calculator Australia
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Borrowing Capacity Calculator
Estimate how much you may be able to borrow for a home loan using your income, living expenses, existing debts, credit card limits, and an assessment-rate buffer. This calculator helps you test realistic lending scenarios by showing how commitments and input changes can affect your indicative borrowing range.
You can model base salary, additional income, rent, household costs, and debt repayments to understand serviceability sensitivity before speaking with a lender. Estimates only. Results can vary by lender policy, documentation, and your circumstances.
Estimate your borrowing power using common Australian lending assessment concepts and debt impacts.
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How we estimate your borrowing capacity
LoanMetric estimates your borrowing capacity using a simplified version of Australian lender serviceability models. We calculate an indicative maximum loan based on your income, living expenses, existing debts and credit limits, and an assessment interest rate (including a buffer). Every bank uses its own credit policy, so actual results may differ.
- Uses an assessment interest rate (rate + buffer)
- Includes credit card limits as ongoing commitments
- Shows indicative results only (not approval)
What to do next
Continue your scenario across LoanMetric calculators.
Home Loan Calculator
Next stepTurn your borrowing estimate into repayment scenarios.
Personal Loan Calculator
Model an unsecured loan and understand cost.
Car Loan Calculator
Model repayments and how debt affects borrowing power.
Data Sources & Methodology
Assessment interest rate
We estimate repayments using an assessment rate equal to your entered interest rate plus a buffer. In Australia, prudential settings often use buffered serviceability concepts. In practice, lenders generally assess loans at a higher rate than the current product rate to allow for potential future rate increases, and each lender sets its own final policy.
Income shading
Base salary is counted at 100%. Other income is shaded to 80% and rental income to 75% to reflect a conservative estimate commonly seen in serviceability approaches.
Living expenses
We compare your entered monthly living expenses with a simplified household benchmark and use the higher value for assessment. This reflects common lender practice where declared expenses can be lifted if they are below benchmark.
Credit card limits
We assess credit card limits at 3% per month as an indicative debt commitment. This is a serviceability assumption and not the card interest rate charged by your provider.
Existing home loans
Existing home loan repayments reduce borrowing capacity because they are treated as ongoing commitments. For simplicity, this calculator uses the monthly repayment you enter. Some lenders may reassess existing home loans using higher assessment rates, which can reduce borrowing capacity further. You can optionally enable advanced mode to assess the existing loan using the higher of your entered repayment and an estimated repayment at the assessment rate.
Serviceability
Serviceability represents the monthly surplus income available to support repayments after living expenses and existing commitments.
Reverse-calculation formula
We first estimate monthly surplus income, then reverse-calculate the loan amount that surplus could support over your selected term at the assessment rate using standard principal-and-interest repayment maths.
Debt-to-Income (DTI)
DTI compares your estimated borrowing amount with your gross annual income. It is displayed as an indicator only and does not directly cap the borrowing estimate in this model.
Last updated: 16 February 2026
Estimates only. Not financial advice or a credit offer.
Resources
Borrowing capacity calculator FAQs
No. This calculator provides an estimate only and is not a credit approval or lender quote.
How much can I borrow in Australia?
A borrowing power calculator is most effective when used to test ranges, not chase a single maximum number. If you are researching how much can I borrow Australia outcomes, the key variables are usually assessable income, ongoing commitments, declared living expenses, and policy buffers. This page helps you map those drivers in a transparent way so you can see which assumptions move the result most and where your borrowing profile may be sensitive.
Borrowing power calculator assumptions
Lenders generally assess serviceability above the product rate. This lender buffer rate is a central part of repayment resilience testing and aligns with prudential concepts often discussed as an APRA buffer framework. In practical terms, the calculator applies an assessment rate to monthly surplus cash flow, then reverse-solves an indicative loan amount supported by that surplus. This provides a more conservative estimate than using only headline product rates.
Results can still differ by lender because serviceability models include policy overlays beyond base repayment maths. Examples include variable income treatment, benchmark expense checks, debt loading, and internal risk settings. Use this calculator as a baseline model, then compare outcomes with lender guidance to understand where policy differences may create narrower or wider borrowing ranges.
Debt-to-income ratio Australia context
Debt-to-income ratio Australia benchmarks are often used as a risk lens, even when repayment capacity appears acceptable. A higher DTI does not automatically mean decline, but it can trigger more conservative credit treatment in some cases. This page surfaces DTI to help you compare scenarios more realistically, especially when testing changes to non-housing debt, credit card limits, or variable income assumptions.
After you estimate range, move to the home loan calculator to test repayment structures and interest sensitivity. You can then cross-check net income assumptions with the take-home pay calculator and monitor macro rate context on the RBA cash rate page.
Example scenario: borrowing power calculator with APRA-style buffer
Example query: "borrowing power calculator with lender buffer rate Australia." Start with your current income and debts, then compare two assumptions: one at current market rate and one with an additional serviceability buffer. Review the change in borrowing estimate, monthly surplus, and DTI. Next, reduce credit card limits or non-home-loan repayments and observe how much capacity recovers. This pattern helps identify which adjustments improve serviceability most before pre-approval discussions.
Practical interpretation and next steps
A strong approach is to plan with a conservative range you can service comfortably, not only the highest estimate shown. Scenario testing around expenses, debt levels, and buffered rates usually gives better decision confidence than relying on one optimistic case. Once scenarios stabilise, discuss verification requirements and lender policy fit with a broker or lender so your estimate-stage work translates cleanly into application-stage expectations.
For term definitions, visit the Finance Glossary. You can also compare debt assumptions with the personal loan calculator.
Disclaimer
- Estimates only. Borrowing outcomes may differ between lenders and products.
- LoanMetric does not provide personal financial advice, credit assistance, or loan approvals.
- Policies, rates, buffers, and market conditions can change at any time.
- Consider speaking with a licensed mortgage broker, lender, or qualified financial professional before making decisions.