One of the first questions most buyers ask is: how much can I borrow for a home loan?

It sounds like a simple question, but the answer depends on much more than your income. Lenders look at your deposit, expenses, debts, credit history, employment type, loan term, interest rate buffer and even the type of property you want to buy.

That is why two people earning the same income can have very different borrowing capacities.

In this guide, we explain how lenders assess home loan borrowing capacity, what can increase or reduce your borrowing power, and why speaking with a mortgage broker can give you a more accurate picture than relying on an online calculator alone.

What Is Borrowing Capacity?

Borrowing capacity, also known as borrowing power, refers to the amount a lender may be willing to lend you based on your financial situation.

When assessing your application, lenders want to know whether you can comfortably afford the proposed loan repayments now and in the future. This is known as serviceability.

In Australia, APRA-regulated lenders must apply a mortgage serviceability buffer of at least 3 percentage points above the loan interest rate when assessing a borrower’s ability to repay a new home loan. APRA confirmed in May 2026 that the buffer remains at 3 percentage points. This means your application is assessed at a higher rate than the rate you may actually pay, as a safeguard against future rate rises or changes in your circumstances.

Why Online Borrowing Calculators Are Only A Starting Point

Online borrowing calculators can be useful for a rough estimate, but they rarely capture the full picture.

They may not fully account for:

• different lender policies
• overtime, bonuses or commission income
• self-employed income
• credit card limits
• HELP/HECS debt
• buy now, pay later accounts
• existing investment properties
• family tax benefits or other income types
• lender-specific expense benchmarks
• loan structure and interest rate assumptions

This is why an online estimate can differ from what a lender is actually prepared to approve. A mortgage broker can compare multiple lenders and provide a clearer view of your real borrowing capacity.

What Do Lenders Look At When Calculating How Much You Can Borrow?

Every lender has its own credit policy, but most look closely at the following factors.

1. Your Income

Your income is one of the biggest drivers of your borrowing power, but lenders do not always treat all income the same way.

They may assess:

• base salary or wages
• overtime
• bonuses
• commission
• self-employed income
• rental income
• dividends
• government benefits
• child support
• investment income

Some income may be shaded, averaged or excluded depending on the lender. For example, bonus and overtime income may need a consistent history before it is accepted in full.

2. Your Employment Type

Stable employment can improve lender confidence. PAYG employees may have a simpler assessment, while self-employed borrowers often need to provide more documentation.

If you are self-employed, lenders may ask for:

• tax returns
• notices of assessment
• business financial statements
• BAS statements
• business bank statements

Some lenders also offer alt-doc loan options for borrowers who cannot provide traditional income documents.

3. Your Living Expenses

Lenders assess your regular household spending to determine how much surplus income you have available for repayments.

They may review expenses such as:

• groceries
• utilities
• insurance
• transport
• childcare
• school fees
• subscriptions
• entertainment
• medical costs
• existing rent or board

It is worth reviewing your expenses before applying. Not because you should artificially understate them, but because unnecessary spending can genuinely reduce your borrowing capacity.

4. Your Existing Debts And Credit Limits

Existing debts can have a major impact on how much you can borrow.

Lenders will consider:

• credit cards
• car loans
• personal loans
• business loans
• HELP/HECS debt
• buy now, pay later facilities
• existing mortgages
• overdrafts and lines of credit

Importantly, lenders usually assess credit cards based on the limit, not just the balance. A card with a $20,000 limit can reduce your borrowing capacity even if you only owe a small amount.

APRA’s residential mortgage lending guidance also notes that lenders should consider HELP debt obligations alongside other debts when assessing borrowing capacity.

5. Your Deposit And Loan-To-Value Ratio

Your deposit affects both your borrowing power and the loan products available to you.

A larger deposit can:

• reduce your Loan-to-Value Ratio (LVR)
• improve your chances of approval
• reduce or avoid Lenders Mortgage Insurance (LMI)
• give you access to more lenders
• potentially improve your interest rate

As a general guide, borrowers with a deposit of at least 20% may avoid LMI. However, some first home buyer schemes and lender policies may allow eligible buyers to purchase with a smaller deposit and no LMI.

6. Your Credit Score And Credit Conduct

Lenders will review your credit report as part of the assessment.

They may consider:

• repayment history
• missed payments
• defaults
• credit enquiries
• credit card and loan accounts
• hardship arrangements
• overall account conduct

A strong credit profile can support your application. If there are issues on your report, it is better to know before you apply so they can be addressed or explained.

7. The Interest Rate And Serviceability Buffer

Your borrowing capacity is affected by the interest rate used in the lender’s assessment.

Because lenders must test your ability to repay at a rate higher than the actual loan rate, a higher interest rate environment can reduce how much you can borrow.

This is why your borrowing capacity can change when rates move, even if your income and expenses stay the same. RBA commentary in 2026 noted that financial conditions remained somewhat restrictive, with established housing market conditions and housing credit growth part of the broader picture.

8. The Loan Term

A longer loan term can reduce monthly repayments, which may improve serviceability. However, it can also increase the total interest paid over the life of the loan.

For example, a 30-year loan may allow lower repayments than a 25-year loan, but the longer term usually means you pay interest for longer.

The right term depends on your age, goals, repayment strategy and lender policy.

9. The Property You Want To Buy

The property itself can also influence approval.

Lenders may apply different rules for:

• apartments under a certain size
• high-density unit developments
• rural or remote properties
• unusual construction types
• company title properties
• properties with commercial zoning
• off-the-plan purchases

Even with strong borrowing capacity, the property must meet the lender’s security requirements.

10. Debt-To-Income Ratio

Debt-to-income ratio compares your total debt to your gross income. From February 2026, APRA-regulated banks are required to limit residential mortgage lending where debt is at or above six times income to no more than 20% of new mortgage lending.

This does not mean borrowers above that level are automatically declined, but it does mean high debt-to-income applications may face tighter assessment depending on the lender.

How To Improve Your Borrowing Capacity

If your borrowing power is lower than expected, there may be ways to improve it before applying.

1. Reduce Credit Card Limits

Because lenders assess the limit rather than the balance, reducing unused credit card limits can make a meaningful difference.

2. Pay Down Personal Loans Or Car Finance

Existing loan repayments reduce your available income. Paying down or closing some debts may improve serviceability.

3. Review Your Living Expenses

Review subscriptions, discretionary spending and recurring costs. A cleaner spending pattern can help demonstrate stronger cash flow.

4. Build A Larger Deposit

A larger deposit may improve your LVR, reduce LMI, expand lender options and strengthen the overall application.

5. Avoid New Credit Applications

Multiple credit enquiries in a short period can affect your credit profile. Avoid applying for new credit before seeking pre-approval.

6. Improve Your Credit Score

Key elements involved in improving your credit score include: paying bills on time, checking your credit report, correcting errors and keeping debts manageable.

7. Choose The Right Lender

This is where a broker can make a big difference. Different lenders assess income, debts and expenses differently. One lender may decline or restrict your borrowing, while another may provide a better outcome.

Why Your Borrowing Capacity Can Differ Between Lenders

Borrowing capacity is not the same across all banks.

Each lender may apply different rules to:

• overtime and bonus income
• self-employed income
• rental income
• credit card limits
• HELP debt
• living expenses
• dependants
• loan terms
• interest rate buffers
• acceptable property types

That means the right lender can make a meaningful difference to your borrowing power, especially if your income or circumstances are not straightforward.

How Sapphire Finance Can Help

At Sapphire Finance Brokerage, we help buyers understand their true borrowing capacity before they start making offers.

We can help you:

• calculate your borrowing power across multiple lenders
• compare home loan options
• identify issues before you apply
• improve your application strategy
• assess whether you may qualify for grants, concessions or low-deposit schemes
• choose between fixed, variable, split or interest-only structures
• move from borrowing estimate to pre-approval with confidence

The goal is not just to borrow as much as possible. It is to secure a home loan that fits your budget, lifestyle and long-term financial goals.

If you're looking for assistance with a home loan reach out to Sonya to explore your borrowing capacity.

Mobile: 0420 954432 Email:admin@sapphirefinance.com.au

Frequently Asked Questions

How much can I borrow for a home loan?
The amount you can borrow depends on your income, expenses, debts, deposit, credit history, loan term, interest rate and lender policy. A mortgage broker can compare multiple lenders to give you a more accurate borrowing capacity estimate.

Why is my borrowing capacity different with each lender?
Each lender uses its own credit policy and assessment method. Some lenders treat overtime, bonuses, self-employed income, rental income, credit card limits and expenses differently, which can change how much they are prepared to lend.

Does my credit card limit affect how much I can borrow?
Yes. Lenders often assess your credit card based on the limit, not just the amount owing. Reducing unused limits can sometimes improve borrowing capacity.

Does HELP/HECS debt affect home loan borrowing power?
Yes. HELP/HECS debt can reduce borrowing capacity because lenders consider ongoing repayment obligations when assessing your ability to service a home loan.

Can I increase my borrowing capacity before applying?
You may be able to improve borrowing capacity by reducing credit card limits, paying down debts, reviewing expenses, building a larger deposit, improving your credit score and choosing a lender whose policy suits your situation.

Is borrowing capacity the same as pre-approval?
No. Borrowing capacity is an estimate of how much you may be able to borrow. Pre-approval is a conditional assessment by a lender, subject to final checks and property approval.

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