Published: 4 March 2026

Borrowing Power Calculator: Understanding How Much You Can Really Borrow

Dreaming of buying your first home, upgrading to a bigger property, or investing in real estate? Before you start attending open inspections, there's one crucial question you need to answer: how much can I borrow? A borrowing power calculator is the essential first tool every Australian home buyer should use to understand their lending capacity and set realistic property expectations.

In this comprehensive guide, we'll explain exactly how borrowing power calculators work, what factors Australian lenders consider when assessing your application, and how you can maximise your borrowing capacity. Whether you're a first-home buyer, an investor, or looking to refinance, understanding your true borrowing power will save you time, disappointment, and help you focus on properties within your reach for the 2025-26 financial year.

What Is a Borrowing Power Calculator?

A borrowing power calculator (also called a borrowing capacity calculator) is an online tool that estimates how much money a lender might be willing to loan you based on your financial circumstances. Unlike a simple mortgage repayment calculator that shows what your repayments would be on a specific loan amount, a borrowing power calculator works backwards — it starts with your income and expenses to determine the maximum loan amount you could potentially secure.

Most Australian banks and mortgage brokers offer free borrowing power calculators on their websites. While these tools provide helpful estimates, it's important to remember that they're only a starting point. Lenders use sophisticated algorithms and manual assessments that consider many additional factors beyond what a basic calculator can capture. Think of a borrowing power calculator as your financial compass — it points you in the right direction, but you'll need professional guidance for the full journey.

How Lenders Calculate Your Borrowing Power

When you apply for a home loan, Australian lenders don't simply look at your gross salary and multiply it by a magic number. They conduct a comprehensive assessment of your financial position using what's called a "serviceability calculation." This calculation determines whether you can comfortably afford loan repayments without experiencing financial stress.

The core formula lenders use considers your total assessable income minus your living expenses and existing debt commitments. What's left over must be sufficient to cover your new mortgage repayments plus a buffer. For the 2025-26 financial year, understanding your after-tax income is crucial because lenders assess your net disposable income — the money that actually hits your bank account after all deductions.

Here's how Australian income tax affects your borrowing power for FY 2025-26:

Note: These rates exclude the 2% Medicare Levy. Use our income tax calculator and Medicare levy calculator for precise figures.

In addition to income tax, don't forget that most Australians pay the 2% Medicare Levy. Higher income earners may also face the Medicare Levy Surcharge if they don't have private health insurance. All these deductions reduce your take-home pay and, consequently, your borrowing power. This is why using an accurate take-home pay calculator is essential before applying for a home loan.

Key Factors That Affect Your Borrowing Capacity

Beyond your gross income and tax obligations, several other factors significantly influence how much you can borrow. Understanding these elements can help you prepare a stronger loan application and potentially increase your borrowing power.

Living Expenses: Lenders use either your declared living expenses or their minimum benchmarks (whichever is higher) to assess your application. The Household Expenditure Measure (HEM) is commonly used as a baseline, but if your actual expenses are higher, lenders will use those figures. Categories include groceries, transport, utilities, insurance, entertainment, and childcare. Reducing discretionary spending in the months leading up to your application can positively impact your borrowing power.

Existing Debts: Any current debt commitments reduce your borrowing capacity. This includes credit cards (even if you pay them off monthly — lenders typically assess the limit, not the balance), personal loans, car loans, and investment property mortgages. Paying down high-interest debts and reducing credit card limits before applying can significantly boost your borrowing power.

Dependents: The number of people who rely on your income affects your borrowing capacity. Each dependent increases your assessed living expenses because you need to support more people on the same income. Single applicants often have higher borrowing power than families with children, all else being equal.

Employment Status: Lenders prefer stable, permanent employment with consistent income. Casual workers, contractors, and self-employed individuals may face stricter assessment criteria and need to demonstrate income over a longer period (typically two years of tax returns). If you've recently changed jobs, some lenders may require you to complete a probationary period before approving a loan.

The Impact of HECS-HELP Debt on Borrowing Power

If you have a university education debt, it's important to understand how HECS-HELP repayments affect your borrowing capacity. For the 2025-26 financial year, compulsory repayments begin once your income exceeds approximately $67,000, with the new marginal repayment system applying.

Under the marginal repayment system introduced in recent years, your HECS-HELP repayment rate is calculated only on the portion of your income above the threshold, not your entire income. This means higher-income earners may see smaller percentage repayments relative to their total income compared to the old system. However, lenders still factor these repayments into their serviceability calculations because they reduce your disposable income available for mortgage repayments.

For example, if you earn $90,000 per year and have a HECS-HELP debt, you'll have compulsory repayments deducted from your salary. A lender will subtract this amount from your assessable income when calculating your borrowing power. Use our HECS-HELP calculator to determine your exact repayment obligations before applying for a home loan.

How to Improve Your Borrowing Power

If your initial borrowing power calculation comes in lower than expected, don't despair. There are several proven strategies to improve your borrowing capacity before submitting a formal loan application.

Reduce Your Credit Card Limits: Lenders assess your credit card limits, not your outstanding balances. A $20,000 credit card limit could reduce your borrowing power by $50,000 or more, even if you pay it off monthly. Consider reducing your limits or closing unused cards entirely.

Pay Down Existing Debts: Eliminating personal loans, car loans, and credit card debt frees up your income for mortgage servicing. Focus on high-interest debts first, but remember that any debt reduction helps your application.

Consider Salary Sacrifice: Strategic use of salary sacrifice arrangements can sometimes improve your overall financial position. By contributing pre-tax dollars to your superannuation, you may reduce your taxable income while building long-term wealth. However, be careful — salary sacrificing reduces your reported income, which could potentially lower your borrowing power in the short term. Consult a financial adviser to determine the right strategy for your situation.

Increase Your Deposit: While this doesn't directly increase your borrowing power, a larger deposit reduces your loan-to-value ratio (LVR) and demonstrates financial discipline to lenders. It also helps you avoid Lenders Mortgage Insurance (LMI), saving you thousands of dollars.

Include All Income Sources: Many applicants forget to declare all assessable income. This can include rental income from investment properties, dividends from shares, child support payments, and certain government benefits. Make sure your borrowing power calculation includes every legitimate income source.

Apply with a Partner: Combining incomes with a spouse or partner is one of the most effective ways to increase borrowing power. Lenders assess the combined income and combined expenses, which often results in significantly higher borrowing capacity than applying individually.

Understanding the Interest Rate Buffer

Australian lenders don't assess your borrowing power based solely on current interest rates. The Australian Prudential Regulation Authority (APRA) requires lenders to apply a serviceability buffer, typically around 3% above the loan's interest rate or a minimum floor rate (whichever is higher). This ensures you can afford repayments even if interest rates rise significantly.

For example, if you're applying for a loan at 6% interest, the lender will assess whether you could afford repayments at 9% (6% + 3% buffer). This conservative approach protects both you and the lender from financial stress if rates increase. When using a borrowing power calculator, remember that the maximum loan amount shown already factors in this buffer.

Comparing Borrowing Power Across Different Lenders

Not all lenders calculate borrowing power the same way. Some are more conservative, while others may be more flexible depending on their risk appetite and current lending policies. A borrowing power calculator from a major bank might show a different result than one from a credit union or non-bank lender.

This variation means it pays to shop around. A mortgage broker can help you compare borrowing capacities across multiple lenders simultaneously, potentially finding you a lender who will approve a higher loan amount based on your specific circumstances. They understand each lender's unique assessment criteria and can direct your application to the most suitable option.

Remember that your borrowing power is just one part of the equation. You should also consider whether the loan amount is comfortable for your lifestyle and financial goals. Just because you can borrow a certain amount doesn't mean you should.

Summary: Maximising Your Borrowing Power

Understanding your borrowing power is a crucial first step in your home buying journey. By using a reliable borrowing power calculator and understanding the factors lenders consider, you can set realistic property expectations and take steps to improve your borrowing capacity if needed.

Key takeaways for Australian home buyers in FY 2025-26:

• Calculate your exact take-home pay after income tax and Medicare levy
• Account for HECS-HELP repayments if you have a student loan
• Reduce credit card limits and pay down existing debts before applying
• Include all assessable income sources in your calculation
• Consider salary sacrifice strategies with professional advice
• Boost your superannuation to demonstrate long-term financial planning
• Remember that lenders apply an interest rate buffer (typically 3%) to assess serviceability
• Shop around — different lenders may offer varying borrowing capacities
• Borrow within your comfort zone, not just your maximum capacity

With careful preparation and a clear understanding of your financial position, you can approach the property market with confidence. Start by calculating your true after-tax income, then use a borrowing power calculator to explore your options. Your dream home might be more achievable than you think.

⚠️ Disclaimer: All figures are estimates for FY 2025-26 based on current tax rates and lending guidelines. Borrowing power calculations are for informational purposes only. Lending criteria, interest rates, and government policies change frequently. Always consult a mortgage broker, financial adviser, or registered tax agent for personalised advice. MyPayAU is not affiliated with the Australian Taxation Office or any financial institution.