If you’re buying a home or investment property, one of the first questions you’ll ask is “How much can I borrow?” In today’s lending market where interest rates, living costs, and lending rules are changing fast, understanding your borrowing power is essential.
How Borrowing Calculators Estimate Your Borrowing Power
Tools like a “How Much Can I Borrow?” home loan calculator give you an estimate based on:
- Income
Salary, casual or contractor income, rental income, bonuses, and self-employment earnings.
- Living Expenses
Household spending is compared against the HEM benchmark, which can reduce your estimate if your declared expenses seem low.
- Existing Debts
Credit card limits, personal loans, car loans, HECS/HELP and buy-now-pay-later services all affect servicing.
- Interest Rate Buffers
Lenders test your affordability at about 3% above the current interest rate to ensure you can handle future rate rises.
- Loan Type & Term
Longer loan terms or interest-only periods can change the result.
While calculators are a great starting point, each lender uses different rules so your real borrowing capacity can vary significantly.
What Affects Your Borrowing Capacity?
Key factors lenders assess include:
- Income stability (full-time, part-time, casual, contractor, self-employed)
- Credit score and repayment history
- Genuine savings and financial behaviour
- Number of dependents
- Current interest rate environment
- Existing debts and credit limits
How to Increase Your Borrowing Power
If you want to maximise how much you can borrow, these steps make the biggest impact:
- Reduce Credit Limits & Pay Down Debts
Close unused cards and lower limits. Even a $10k credit limit can reduce borrowing power.
- Improve Your Spending Habits
Avoid large purchases and cut unnecessary subscriptions 3–6 months before applying.
- Strengthen Your Savings History
Regular contributions prove financial discipline and improve your profile.
- Protect Your Credit Score
Pay bills on time and minimise new credit enquiries.
- Increase Your Income Where Possible
Extra shifts, documented bonuses or updated self-employed financials can help.
- Get a Broker Assessment
A mortgage broker can compare your scenario across multiple lenders, giving you a far more accurate borrowing estimate than any single online calculator. Brokers also understand how different lenders treat income types, expenses, and debts, which can make a significant difference to your borrowing capacity.
Why this matters?
Mortgage brokers in Australia are legally bound by the Best Interests Duty (BID). This means a broker must recommend the loan option that is in your best interests, not theirs.
Banks do not have this obligation and will only offer their own products, even if a better solution exists elsewhere.
Because of this, using a broker can have a meaningful impact not only on your borrowing power, but also on the suitability and long-term cost of the loan you end up with
