Australia Borrowing Power Calculator

What is a Borrowing Power Calculator?

A borrowing power calculator estimates the maximum amount an Australian bank or lender will approve you to borrow for a home loan, based on your income, expenses, existing debts, and the lender’s assessment criteria. Knowing your borrowing power before you start house hunting is one of the most important steps in the property buying process — it tells you your realistic budget and prevents the disappointment of falling in love with a property you can’t finance.

Australian lenders are required by APRA (the Australian Prudential Regulation Authority) to assess your ability to repay a loan at a serviceability buffer of 3% above the actual loan rate. This means if the current rate is 6.2%, the bank will check whether you can afford repayments at 9.2% — a significant stress test designed to ensure borrowers can handle rate rises.

How is Borrowing Power Calculated in Australia?

Australian banks calculate borrowing power using a net surplus income method. They assess your total income (with some shading depending on income type), subtract your living expenses and all existing debt commitments, and then determine what loan repayment you can afford at the assessment rate. The loan amount that produces that repayment is your borrowing power.

How to Use This Borrowing Power Calculator

Enter your gross annual income (and your partner’s if applying jointly). Add any rental or investment income — note that banks typically shade this by 20%. Select your employment type, as casual and self-employed applicants are assessed more conservatively. Enter your actual home loan rate (check current rates with your lender or broker) — the calculator automatically adds the 3% buffer. Enter your monthly living expenses, number of dependants, and all existing debt commitments including car loans, credit card limits, and HECS repayments.

What is the APRA 3% Serviceability Buffer?

Since November 2021, APRA requires all Australian banks and lenders to assess mortgage applications at a minimum buffer of 3% above the loan’s interest rate. This replaced the previous 2.5% buffer. The buffer is a regulatory stress test — it doesn’t mean you’ll pay that rate, but the bank must be satisfied you could afford repayments if rates rose by 3%. With current variable rates around 6.1–6.4%, banks are assessing applications at approximately 9.1–9.4%.

How Credit Cards Affect Borrowing Power

Many Australians are surprised to learn that banks assess credit card limits — not balances — when calculating borrowing power. Most lenders apply a monthly commitment of approximately 3.8% of your total credit card limit (some use 3%). On a $20,000 credit card limit, that’s $760/month counted as a commitment regardless of whether you owe anything on the card. Reducing or cancelling unused credit cards before applying for a home loan can significantly increase your borrowing power.

How HECS Debt Affects Borrowing Power

Your compulsory HECS repayment is assessed by lenders as a monthly commitment that reduces your disposable income and therefore your borrowing power. On a $75,000 income with a $30,000 HECS balance, your compulsory repayment is approximately $218/month — which can reduce borrowing power by $40,000–$60,000 depending on the lender. This is separate from the HECS balance itself, which does not appear on your credit report.

Employment Type and Borrowing Power

Full-time PAYG employees have the highest borrowing power as income is considered most stable. Part-time income is assessed at face value if it has been consistent for at least 12 months. Casual income requires at least 12 months history and is typically shaded by 20%. Self-employed applicants must provide two years of tax returns and financials — lenders use the lower of the two years’ income or an average, and often apply conservative shading. Contractors vary by lender — some treat them like PAYG, others like self-employed.

How to Increase Your Borrowing Power

• Cancel unused credit cards: Reducing total credit limits directly increases monthly surplus.
• Pay down existing debts: Eliminating car loans or personal loans removes monthly commitments from the assessment.
• Increase your deposit: A larger deposit reduces the loan amount needed and may eliminate LMI costs above 80% LVR.
• Joint application: Adding a co-borrower with income significantly increases combined borrowing power.
• Reduce declared living expenses: Be accurate but thorough — don’t over-declare discretionary spending.
• Choose a longer loan term: A 30-year term has lower monthly repayments than a 25-year term at the same rate, increasing borrowing power.
• Pay off HECS voluntarily: If your HECS balance is small, paying it off removes the monthly commitment from lender calculations.

What is LVR and Why Does it Matter?

LVR (Loan-to-Value Ratio) is your loan amount divided by the property value, expressed as a percentage. An 80% LVR means you’re borrowing 80% and have a 20% deposit. Above 80% LVR, most lenders require Lenders Mortgage Insurance (LMI) — a one-off premium that protects the lender (not you) if you default. LMI can cost $8,000–$30,000+ and is typically added to the loan, reducing your effective borrowing power further. Saving a 20% deposit to avoid LMI is a significant financial advantage.

Frequently Asked Questions