💸 Borrowing Power Calculator

Borrowing Power Calculator: How Much Can You Borrow?

Understanding your borrowing power is the first step toward buying a home, refinancing, or planning a large purchase. Borrowing power — sometimes called borrowing capacity or loan eligibility — refers to the maximum loan amount a lender is likely to approve based on your financial situation. This page provides a practical calculator and a clear explanation of the factors lenders consider, so you can plan with confidence.

What determines borrowing power?

Most lenders assess borrowing power using two broad approaches: a simple income-multiplier and a detailed serviceability test. The income-multiplier multiplies your annual income by a factor (commonly 3–6x) to give a quick estimate. Serviceability is more comprehensive and inspects your net monthly income, living expenses, existing debt repayments, the loan’s interest rate and term — producing a realistic maximum loan that you can afford to repay.

Income multiplier vs serviceability — which to trust?

An income multiplier is fast and useful for early planning but can be misleading because it ignores monthly expenses and other liabilities. The serviceability method is more accurate. It simulates the monthly repayment for a hypothetical loan using an assumed interest rate and term, then compares that repayment to your disposable income after expenses and debts. Lenders typically require a buffer to account for rate rises and unforeseen costs.

Key inputs that affect borrowing power

Your borrowing power increases when:

• Your gross annual income or stable additional income rises.
• You reduce monthly living costs and outstanding debts.
• Interest rates fall or you choose a longer loan term (though a longer term increases total interest paid).
• Your credit history is strong — lenders may offer better terms.

How the calculator works (briefly)

This tool offers both methods. The income-multiplier multiplies combined incomes by your chosen multiplier (default 4.5). The serviceability method uses the loan payment formula to calculate the maximum principal that results in a monthly repayment your income can support after debts and expenses. The loan payment formula used is the standard amortizing loan formula used by banks worldwide.

Real world tips

Use conservative assumptions. Try several scenarios: lower income, slightly higher interest rate and higher living costs to see the effect. If lenders use a stress interest rate (for example, 3%–5% above current rates), test your suitability against that higher rate. Pre-approval from a mortgage broker or lender gives the most reliable borrowing power figure.

When to consult a professional

Calculators are excellent planning tools, but individual circumstances vary — self-employed income, short-term contracts, or complex investment and asset structures need professional review. Speak with a mortgage broker or lender for tailored pre-approval and to compare loan products.

Summary

Borrowing power matters because it shapes your property search and budgeting. Use this calculator to estimate possibilities, but confirm with lenders. Reduce debts, improve savings and manage expenses to increase your borrowing capacity and secure better loan terms.

Frequently Asked Questions