“Borrowing power” is one of the most searched home loan questions in Australia—and for good reason. It determines what you can realistically afford and how competitive you are as a buyer. While online calculators are a starting point, lenders use far more detailed assessments to calculate your real borrowing capacity.

This guide explains how borrowing power works, what lenders look at, and the steps you can take to strengthen your position before applying for a home loan.

What Borrowing Power Actually Means

Borrowing power (or borrowing capacity) is the amount a lender is willing to let you borrow based on their assessment of your ability to repay the loan comfortably.

It isn’t a fixed number—different banks will often give you very different outcomes.

How Lenders Calculate Borrowing Power

Lenders use a detailed formula built around your income, expenses, debts, credit history, and the loan product you choose. Key factors include:

1. Income

Lenders consider:

1. Salary or wages
2. Overtime, bonuses or commissions (usually shaded or reduced)
3. Rental income
4. Business income (if self-employed)
5. Government payments (case-by-case)

Reliable and recurring income increases borrowing power.

2. Living Expenses

Financial institutions assess your actual spending patterns across categories such as groceries, utilities, transport, childcare, insurance, entertainment, and subscriptions.

Your spending is compared against HEM (Household Expenditure Measure), but banks increasingly rely on real transaction history.

Higher living costs = reduced borrowing power.

3. Existing Debts

Any debt can significantly reduce your capacity, including:

Credit cards (even unused limits)

1. Personal loans or car loans
2. Buy now, pay later accounts
3. HECS/HELP
4. Overdrafts
5. Other mortgages

Even a $10,000 credit card limit can reduce borrowing power by tens of thousands.

4. Your Deposit Size

A larger deposit reduces risk for the bank and may give you access to better rates or avoid Lenders Mortgage Insurance (LMI), improving overall borrowing ability.

5.Your Credit Score

Strong credit history = more lending options.

Poor credit = restricted lender choices and lower approved amounts.

Banks look for:

1. A clean repayment history
2. Low credit utilisation
3. Stability with credit products
4. Absence of late payments or defaults

6. Loan Type and Interest Rate

Your borrowing capacity changes depending on whether you choose:

1. Principal and interest
2. Interest-only
3. Fixed rate
4. Variable rate
5. Loan term length

Even small rate differences change the lender’s serviceability calculations.

Why Borrowing Power Varies Between Lenders

Every lender uses its own:

1. Serviceability calculator
2. Income shading rules
3. Risk appetite
4. Policy on overtime, bonuses, or self-employed income
5. Assessment rates (buffer added to the actual interest rate)

This is why a broker often finds significantly higher borrowing power than a single bank.

How to Increase Your Borrowing Power

Small adjustments can make a noticeable difference. Key steps include:

1. Reduce or close unused credit limits
   • Credit cards and BNPL facilities are some of the biggest capacity killers.
2. Trim discretionary spending:
   • Banks review 3–6 months of transactions. Reducing after-pay cycles, takeaway, subscriptions and online shopping improves your serviceability profile.
3. Pay down personal or car loans:
   • Clearing short-term debts increases free cash flow.
4. Build a stronger savings pattern:
   • Regular deposits into your savings account demonstrate discipline and lower perceived risk.
5. Improve your credit score  
   • Pay bills on time
   • Reduce credit utilisation
   • Avoid unnecessary credit applications
6. Extend loan term (if appropriate)
   • A longer term reduces repayments and may boost capacity—though you pay more interest overall. Not suitable for everyone.

Why Online Calculators Can Be Misleading

Most calculators don’t factor in:

1. Real spending habits
2. Credit file details
3. Bank-specific policies
4. Income shading
5. Lender risk rules
6. HECS/HELP
7. Variations in interest rate buffers

Your true borrowing power can be dramatically higher—or lower—than the estimate.

A Broker Gives a More Accurate Picture

Brokers can run your scenario through multiple lender calculators, compare policies, and identify who will give you the strongest borrowing outcome. It’s also faster and avoids unnecessary credit enquiries.

Final Thoughts

Knowing your borrowing power early gives you confidence when planning, searching, or negotiating. If you want a clear, accurate figure based on your personal circumstances, a conversation with a broker will give you the most reliable result.