What Is Borrowing Capacity and How Do You Maximise Yours Before Buying an Investment Property?
Image of a bank sign on a building.
Most people think their borrowing capacity is fixed. It is not.
Your borrowing capacity is the amount a lender will approve you to borrow based on your financial position at the time of application. And while it starts with your income, it is shaped by a much wider set of factors, many of which you can actively change before you apply.
Understanding what drives your borrowing capacity, and what quietly reduces it, is one of the most valuable things you can do before buying an investment property. It is also one of the most overlooked.
What Is Borrowing Capacity and How Is It Calculated?
Borrowing capacity is the maximum amount a lender is willing to lend you based on their assessment of your ability to service, meaning repay, the loan over time.
Lenders do not just look at your income and divide by a number. They run a detailed serviceability assessment that factors in your income, existing debts, living expenses, the proposed loan repayments, and a buffer rate on top of the actual interest rate to stress test whether you can still meet repayments if rates rise.
The formula varies between lenders, which is why your borrowing capacity at one bank can be meaningfully different from your capacity at another. This matters more than most people realise.
What Do Lenders Actually Look At?
Your gross income
This includes salary, wages, rental income from existing properties, business income if self-employed, and in some cases other income such as overtime, bonuses or government payments. Lenders treat each income type differently. Salary income is taken at full value. Rental income is typically assessed at 70 to 80 percent to account for vacancy and costs. Bonus income is sometimes included and sometimes not, depending on the lender and how consistent it is.
Your existing debts and liabilities
Every debt you carry reduces your borrowing capacity. This includes your home loan if you have one, car loans, personal loans, HECS or HELP debt, and credit cards. Credit cards are assessed on their limit, not their balance. A $20,000 credit card limit you never use still reduces your borrowing capacity because the lender assumes you could draw it down at any time.
Your living expenses
Lenders use a combination of your declared living expenses and a benchmark called the Household Expenditure Measure to assess your ongoing costs. If your declared expenses are lower than the benchmark, the lender typically uses the benchmark. Living frugally does not always translate to more borrowing power in the way people expect.
The buffer rate
Lenders do not assess your serviceability at the actual interest rate on the loan. They add a buffer, typically 3 percent above the rate, and test whether you could still repay at that higher rate. This is a regulatory requirement introduced by APRA to ensure borrowers are not overexposed if rates rise.
Rental income from the investment property
When you are buying an investment property, lenders will factor in the expected rental income as part of your income. This partially offsets the cost of the loan in their serviceability calculation. Properties with stronger rental yields improve your borrowing position more than low-yield properties.
What Quietly Reduces Your Borrowing Capacity?
Many investors are surprised to find their borrowing capacity is lower than expected. In most cases, the culprits are predictable once you know what to look for.
Credit cards with high limits
As mentioned above, lenders assess credit cards on limit, not balance. Reducing or cancelling credit cards you do not need is one of the fastest ways to improve your borrowing capacity before applying.
Buy now pay later accounts
Afterpay, Zip, and similar services are increasingly picked up in lender assessments. Even small limits can affect the calculation. Close accounts you are not actively using.
Too many recent credit enquiries
Every time you apply for credit, an enquiry is recorded on your credit file. Multiple enquiries in a short period can signal financial stress to lenders and reduce your assessed capacity. If you are preparing to apply for an investment loan, avoid unnecessary credit applications in the six months prior.
HECS and HELP debt
HECS debt does not affect your credit score, but it does reduce your borrowing capacity because lenders factor in your compulsory repayment amount as an ongoing liability. A $60,000 HECS debt can reduce borrowing capacity by more than $100,000 in some lender models.
Being self-employed
Lenders assess self-employed income differently from salary income. Most require two years of tax returns and will use your average income or the lower of the two years. If your income has grown significantly, your assessed income may be lower than your current actual earnings.
How to Maximise Your Borrowing Capacity Before You Apply
The good news is that borrowing capacity is something you can work on. Here is where to focus.
Reduce or cancel unused credit cards and BNPL accounts
This is the lowest effort, highest impact action for most people. Go through your credit file and close anything you are not using. Even reducing a $20,000 credit card limit to $5,000 can meaningfully improve your capacity.
Pay down or eliminate personal loans and car loans
High-interest, short-term debt carries a disproportionate weight in serviceability calculations. Clearing a personal loan before applying can free up significant borrowing capacity.
Understand how rental income is counted
When buying an investment property, the rental yield of the property you are buying affects your borrowing position. A property with a 5 percent yield is assessed more favourably than one with a 3 percent yield. This is one of the reasons yield matters beyond just monthly cashflow.
Compare lenders, not just rates
Because serviceability models vary between lenders, your borrowing capacity is not the same at every institution. A mortgage broker who has access to dozens of lenders can identify which lenders will assess your position most favourably. This is not about finding a lender who will lend you more than you can afford. It is about finding the lender whose model best reflects your actual financial position.
Get your documentation in order early
Lenders want to see consistent, well-documented income. If you are self-employed, make sure your tax returns are lodged and up to date. If you have variable income, be prepared to show evidence of its consistency.
How Does the 2026 Federal Budget Affect Borrowing Capacity?
For investors buying established property after Budget night, the ring-fencing of negative gearing losses to property income only from July 2027 does not directly affect your borrowing capacity at application. Lenders assess serviceability based on rental income and loan repayments, not on the tax deductibility of losses.
However, it does affect your cashflow position after purchase. Because the immediate annual tax benefit of negative gearing is reduced for established property, investors need their properties to carry more of their own weight. This makes rental yield and holding costs more important than ever when selecting a property.
For new build investors, full negative gearing is retained, which means the cashflow position looks the same as it always has under lender assessment.
Want to know exactly how much you can borrow for your next investment property?
Our finance team at Motivate Finance works with investors Australia-wide to find the right lender and structure for your situation. Book a free finance assessment today to see where you’re at.
Frequently Asked Questions
How much can I borrow for an investment property in Australia? This depends entirely on your individual financial position including income, existing debts, living expenses and the rental income of the property you are buying. The best way to get an accurate number is to speak with a mortgage broker who can run a full serviceability assessment across multiple lenders.
Does owning my own home affect how much I can borrow for an investment property? Yes. Your existing home loan repayments are factored into your serviceability assessment as an ongoing liability. However, the equity in your home may also be used as security for an investment loan, which can reduce or eliminate the need for a separate cash deposit.
Can I use the rental income from my investment property to increase my borrowing capacity? Yes. Lenders factor in expected rental income, typically assessed at 70 to 80 percent of the gross rent, as part of your income in the serviceability calculation. A stronger rental yield improves your borrowing position.
How long does it take to improve my borrowing capacity? Some actions take effect quickly, such as reducing credit card limits or paying off a personal loan. Others, like building a track record of consistent income, take longer. If you are planning to buy in the next 6 to 12 months, now is the time to start optimising your position.
Should I use a mortgage broker or go directly to my bank? For investment property, using a mortgage broker who has access to a panel of lenders is almost always the better option. Lender serviceability models vary significantly and a broker can identify which lender will assess your situation most favourably.
Disclaimer: This article provides general information only and does not constitute financial or lending advice. Borrowing capacity assessments depend on individual circumstances. Always seek advice from a qualified mortgage broker or financial adviser before making borrowing decisions.