Know Your Number Before the Lender Does

Ready to see real rates? Your number is just the beginning.

Now you know what you can borrow. The next step is finding out what rate you'll actually pay — and that depends on your credit profile, not a generic assumption.

How this Borrowing Power Calculator works

Personal loan lenders in Australia don't just look at your income — they look at what's left after everything you already spend and owe. This calculator mirrors that logic in three transparent steps.

Step 1: Convert income to a monthly net figure. If you enter a gross annual income, the calculator applies an estimated Australian resident income tax rate based on the ATO's 2025–26 marginal tax brackets to arrive at an approximate monthly take-home income. If you toggle to net monthly income instead — because you know your take-home pay precisely — that figure is used directly.

Step 2: Calculate your available surplus. From your estimated monthly net income, the calculator subtracts your monthly living expenses and existing monthly debt repayments. The result is your uncommitted monthly income — the cash left each month that could theoretically be directed toward a new loan repayment. If this figure is zero or negative, your calculated borrowing power is zero, and the calculator will tell you so directly rather than producing a misleading number.

Step 3: Reverse-engineer the maximum loan amount. The calculator uses the standard amortisation formula in reverse — solving for principal rather than repayment. Given your chosen rate and term, it calculates the largest loan whose repayments do not exceed your surplus. This is the same core logic lenders apply, though real lenders also layer on Household Expenditure Measure (HEM) benchmarks, Uncommitted Monthly Income (UMI) calculations, and their own credit risk buffers — which means a lender's assessment may produce a more conservative number than shown here.

A note on the tax estimation: simplified rates from the 2025–26 ATO resident brackets are used. Medicare levy, tax offsets, salary packaging, and investment property deductions are not included. If your actual take-home pay differs from the estimate, toggling to net monthly income will give you a more precise result.

How to interpret your results

• Maximum borrowing power is a ceiling, not a target. Borrowing at 100% of the calculated maximum leaves no room for rates to rise, income to dip, or unexpected expenses to arrive. Most experienced borrowers aim for 70–80% of their maximum. That buffer is what separates a manageable loan from a stressful one.
• What the affordability traffic light means. Green (under 15%): the repayment fits comfortably. Amber (15–25%): manageable but not generous — be disciplined about discretionary spending and have an emergency fund. Red (over 25%): meaningful pressure on your finances. Not necessarily a no — but go in with both eyes open.
• Worked example. $65,000 gross income, $2,500 monthly expenses, $500 existing debt repayments. At 10% p.a. over 5 years: net income ~$4,350; surplus ~$1,350/month; supports a max loan of ~$63,000. Targeting the amber zone (under 20% of take-home) brings a more conservative target of ~$38,000–$42,000.
• Total interest is a real cost, not a footnote. Extending the term to lower your monthly repayment doesn't make the loan cheaper. It makes it longer and more expensive. Loans reward discipline, not drama.

How to improve your borrowing power

• Reduce existing debt — especially credit card limits. Credit card limits count against you in lender serviceability calculations even if you never use them. Closing unused cards or reducing limits before you apply directly increases your calculated surplus.
• Document every legitimate income source. Rental income, dividends, government payments, and regular partner contributions can all be included. Use the additional income field — but only include income you can substantiate.
• Target a smaller loan amount. Borrowing $30,000 instead of $45,000 doesn't just lower the repayment; it lowers your total interest cost significantly and reduces the affordability risk.
• Extend the loan term knowingly. Moving from 3 years to 5 years lowers your monthly repayment and increases your calculated borrowing power — but increases total interest. A valid tool when cash flow is tight; a trap when used to over-borrow.
• Work on your credit score before applying. At 8% p.a. you can borrow substantially more than at 14% p.a. for the same monthly repayment. Check your credit report via Equifax, Experian, or illion. Correct errors, reduce credit enquiries, resolve any defaults.
• Consider a secured personal loan. If you have an asset to offer as security — a vehicle, equipment, or term deposit — a secured loan typically attracts a lower rate, increasing the loan amount you can service from the same surplus.

Example Borrowing Power Calculations in Australia

Four scenarios showing how income, expenses, and existing debt combine to produce different borrowing power outcomes. All figures are indicative and use May 2026 market rate assumptions.

Calculator assumptions

This calculator provides a directional estimate of personal loan borrowing power — not a guaranteed approval amount or a credit assessment. Results are based on simplified income tax estimates using 2025–26 ATO resident rates, standard amortisation mathematics, and the income and expense figures you enter. The actual borrowing capacity assessed by a lender will typically differ. Lenders apply HEM benchmarks as a floor for living expenses, add a credit risk buffer of 2–3% above the assessed rate for serviceability, and conduct a full review of credit history and income documentation. Figures reference market conditions as of May 2026 and are subject to change. This calculator does not constitute financial or credit advice. Reviewed by the LoanGorilla editorial team — last updated May 2026.