Understanding Home Affordability

Home affordability is one of the most important factors to consider before applying for a mortgage. Lenders assess your ability to repay a home loan based on several financial factors, and understanding these can help you prepare before you approach a bank or mortgage broker.

In Australia, most lenders use a debt-to-income ratio to determine how much they are willing to lend. As a general guide, your total home loan repayments should not exceed 30% of your gross income. However, this varies depending on your lender, your credit history, and current interest rates set by the Reserve Bank of Australia (RBA).

For a more detailed estimate of what lenders may offer you, try our Borrowing Power Calculator.

With property prices in cities like Sydney and Melbourne remaining high, knowing your affordability limit before you start searching can save you time and help you focus on properties within your realistic budget..

Key Factors That Affect How Much House You Can Afford

Several factors influence how much home you can afford. Understanding each one can help you make smarter financial decisions.

Your Income The higher your income, the more you can borrow. Lenders typically assess your gross annual income when calculating your maximum loan amount. If you have a partner or co-borrower, their income can also be included.

Existing Debts Car loans, personal loans, credit cards, and HECS-HELP debts all reduce your borrowing power. Lenders count your existing monthly repayments against your income when deciding how much to lend you. Paying off debts before applying for a home loan can increase your affordability.

Your Deposit A larger deposit means a smaller loan, which results in lower repayments and less interest paid over time. In Australia, most lenders require a minimum deposit of 5% to 20% of the property price. If your deposit is below 20%, you may also need to pay Lenders Mortgage Insurance (LMI).

Interest Rate The interest rate on your loan directly affects your monthly repayments. Even a small change in rate can significantly impact what you can afford over a 25 or 30-year loan term. Use this calculator to compare different rate scenarios.

Already have a loan? Our Mortgage Refinance Calculator can show you if switching to a lower rate could save you money.

Loan Term Choosing a longer loan term, such as 30 years, reduces your monthly repayments but increases the total interest you pay. A shorter term means higher repayments but lower overall cost.

Living Expenses Your day-to-day costs — groceries, utilities, insurance, and transport — reduce how much of your income is available for loan repayments. Lenders will assess your living expenses when reviewing your application..

Tips to Improve Your Home Affordability

If this calculator shows a lower home price than you were hoping for, there are practical steps you can take to improve your position:

• Save a larger deposit — Even an extra $10,000–$20,000 in deposit can meaningfully increase what you can afford and reduce your loan amount

• Pay down existing debts — Clearing car loans or credit card balances before applying can increase your borrowing power

• Reduce your monthly expenses — Cutting back on non-essential spending in the months before applying can improve how lenders view your finances

• Consider a longer loan term — Spreading repayments over 30 years reduces monthly costs, though it increases total interest

• Look at government schemes — First home buyers in Australia may be eligible for the First Home Owner Grant (FHOG) or the First Home Guarantee scheme, which can help reduce the deposit required

Frequently asked questions

How much house can I afford on a $100,000 salary in Australia?

As a general guide, lenders allow borrowing around 5 to 6 times your annual income, depending on your debts and expenses. On a $100,000 salary, you may be able to borrow between $500,000 and $600,000, though this depends on your deposit, existing debts, and the lender's assessment criteria.

How much deposit do I need to buy a house in Australia?

Most lenders require a minimum deposit of 5% to 20% of the property price. If your deposit is less than 20%, you will likely need to pay Lenders Mortgage Insurance (LMI), which adds to your upfront costs.

What is a good debt-to-income ratio for a home loan?

Most Australian lenders prefer your total debt repayments to be no more than 30–35% of your gross income. A lower ratio improves your chances of approval and may help you secure a better interest rate.

Is this calculator accurate?

This calculator provides a reliable estimate based on the information you enter. However, actual borrowing limits vary by lender, credit history, and current lending policies. Use this as a starting guide, then speak with a mortgage broker or bank for a personalised assessment..

Does my HECS-HELP debt affect how much I can borrow?

Yes. Australian lenders include HECS-HELP repayments when assessing your borrowing capacity. Even though HECS is repaid through your tax, it reduces your net income, which affects how much you can afford.

What is the difference between affordability and borrowing power?

Affordability refers to how much you can comfortably repay based on your budget. Borrowing power is the maximum amount a lender is willing to lend you. These figures are not always the same — you may be able to borrow more than you can comfortably afford, so it is important to assess both.

Can I use this calculator if I am buying with a partner?

Yes. Simply enter your combined annual income and combined monthly debts and expenses to get a household affordability estimate.

Does this calculator include stamp duty?

No. This calculator estimates your loan amount and home price based on your financial situation. Stamp duty is an additional upfront cost that varies by state.

Use our Stamp Duty Calculator to estimate this separately.

Start Planning Your Home Purchase Today

Understanding your affordability before you start house hunting puts you in a much stronger position. You will know which properties are within your budget, what deposit you need to save, and how different interest rates affect your repayments.

Use this calculator as a starting point, then explore our other free tools to build a complete picture of your home loan options.