When people first start thinking about buying a home or investing, one of the first questions they ask is: “How much can I borrow?”
Most assume the answer is simple: “It depends on my income.”
Income matters, of course. But in reality, borrowing power is influenced by a much wider set of factors, many of which aren’t obvious at first glance.
Understanding these early can make a meaningful difference to what — and when — you can buy.
Income Is Just the Starting Point
Your income forms the foundation of your borrowing capacity, but lenders don’t look at it in isolation.
They consider how stable your income is, how it’s structured (whether that’s salary, casual, self-employed, or investment income), and how long you’ve been earning it.
Two people earning the same amount can end up with very different borrowing power, simply due to how predictable their income appears to a lender. Someone who’s been in the same salaried role for three years will typically have stronger borrowing capacity than someone who’s been self-employed for six months, even if their current income is identical.
Your Expenses Matter Just as Much
Lenders focus heavily on what’s left over after your expenses, not just what comes in. This is called serviceability, and it’s one of the most important factors in determining how much you can borrow.
This includes everyday living costs like groceries, utilities, subscriptions, and transport. It also includes existing debts like credit cards, car loans, personal loans, and HECS. Even dependants and family commitments factor into the calculation.
Here’s something that surprises many people: even unused credit card limits can reduce borrowing power, because lenders assume they could be used at any time. A $10,000 credit card you haven’t touched in years might still be reducing your borrowing capacity by $50,000 or more.
Debt Is Assessed More Strictly Than Most People Expect
Not all debt is “bad”, but all debt is counted when you apply for a home loan.
Credit cards are assessed based on the limit, not the balance. So even if you pay off your card in full every month, the lender assumes you could max it out tomorrow. Car loans reduce capacity more than many expect due to fixed repayments over multiple years. Buy-now-pay-later facilities like Afterpay or Zip are still assessed, even if you rarely use them.
For investors, rental income helps, but it’s not counted dollar-for-dollar. Most lenders will only count 80% of rental income to account for vacancies and maintenance, and existing investment loans still reduce your overall capacity.
Interest Rates Are Stress Tested
Lenders don’t assess your loan at today’s interest rate. Instead, they add a buffer above the actual rate (typically 3% or more) and test whether you could still afford repayments if rates rise.
This protects borrowers long-term, but it also means borrowing power can change even if your income stays the same. When rates rise, the amount you can borrow falls, even if nothing else in your financial situation has changed.
That’s why understanding when to speak to a broker matters so much. Having a clear picture of your borrowing position early means you can plan around rate movements rather than being caught off guard.
Borrowing Power Is a Strategy, Not a Single Number
One of the biggest mistakes first home buyers and new investors make is treating borrowing capacity as a fixed limit, rather than something that can be planned and improved.
Your borrowing power is shaped by income and expenses, existing commitments, loan structure, timing, and future plans. That’s why early conversations matter, not to rush a purchase, but to help set things up properly from the start.
Ways to Improve Your Borrowing Power
The good news? There are often practical steps that can improve borrowing capacity over time. Some common examples include:
Cleaning Up Unused Debt. Closing unused credit cards or reducing limits can have a surprisingly positive impact, even if the cards aren’t used. This is one of the simplest and most effective ways to improve serviceability.
Reviewing Existing Loans. Refinancing or restructuring personal loans or car finance can sometimes improve cash flow and serviceability. If you’re thinking about buying soon, it’s worth reviewing whether refinancing makes sense.
Building a Consistent Savings Pattern. Lenders like to see genuine savings, not just for the deposit, but as evidence of financial discipline. Regular contributions over several months show you can manage cash flow responsibly.
Adjusting Timing. Sometimes waiting a few months to clear a debt, finish a probation period, or build income history can meaningfully improve outcomes. This doesn’t mean delaying unnecessarily, just being strategic about when you apply.
Choosing the Right Loan Structure. The way a loan is set up (interest type, features, repayment style) can affect both current borrowing power and future flexibility. This is especially important for buyers who plan to upgrade, invest, or change how the property is used later. Understanding the difference between variable and fixed loans is a good place to start.
Final Thought
Borrowing the maximum possible isn’t always the goal. The real aim is to buy comfortably, stay resilient if things change, and keep future options open.
Understanding how borrowing power actually works puts you in control, and helps avoid surprises later in the process. It’s not just about what you can borrow today, but what you can do with that borrowing capacity over the long term.
Want to Know Where You Stand?
If you’re thinking about buying your first home or investment property, a short conversation can help clarify your current borrowing position, what’s helping or limiting it, and what steps could improve it over time.
There’s no pressure to apply or buy, just a chance to get clear and plan with confidence.
Book a time to chat and let’s work out where you really stand.