For many Australians, getting into the property market has become increasingly difficult. Rising property prices, higher interest rates and pressure on household budgets have made lower monthly mortgage repayments more attractive.

That is where a 40-year mortgage can appear appealing. Extending a home loan from the traditional 25- or 30-year term can reduce the required monthly repayment and potentially make a property appear more affordable.

But a lower repayment does not necessarily mean a cheaper mortgage.

As discussed by John Saade, CEO and Co-Founder of Latitude Accountants, the real question is not simply whether you can afford the repayment today. You also need to consider what the loan will cost you over its entire term and whether the underlying property purchase makes financial sense.

With the Reserve Bank of Australia’s cash rate influencing mortgage rates, borrowing costs remain an important consideration for Australian households.

So, are 40-year mortgages worth it? For some borrowers, they may provide useful cash-flow flexibility. For others, the additional decades of interest could significantly increase the overall cost of home ownership.

What Is a 40-Year Mortgage?

A 40-year mortgage is a home loan structured to be repaid over 40 years rather than a more common 25- or 30-year term.

The basic principle is straightforward:

• You borrow money to purchase a property.
• You make regular principal and interest repayments.
• The repayment period is extended to 40 years.
• Your required periodic repayment can be lower.
• However, you generally pay interest for longer.

Australian government financial guidance notes that a longer loan term generally means lower repayments but more interest paid over the life of the loan.

The attraction is therefore primarily cash-flow relief, not necessarily a reduction in the cost of borrowing.

Why Are 40-Year Home Loans Becoming More Attractive?

The biggest reason is affordability.

When property prices are high, borrowers may struggle to meet the repayment requirements associated with a standard 30-year mortgage.

Extending the loan term can potentially:

• Reduce monthly repayments
• Improve short-term cash flow
• Increase borrowing capacity in some circumstances
• Make a property appear more affordable
• Give borrowers additional financial breathing room

For a household struggling with monthly expenses, that difference can matter.

But there is an important distinction between making a property affordable to finance and being able to comfortably afford the property itself.

If extending the loan to 40 years is the only way the numbers work, it is worth asking whether the property is simply too expensive for your current financial position.

How Much More Does a 40-Year Mortgage Cost?

The biggest drawback is the additional interest.

Consider a hypothetical $600,000 mortgage. The exact repayment and interest difference will depend on the interest rate, fees, and loan structure, but extending the term can substantially increase the total interest paid.

For example, using a constant illustrative interest rate, a longer term can reduce the required monthly repayment while increasing the amount paid to the lender over time.

This is why borrowers should look beyond the monthly repayment and compare:

• Monthly repayment
• Total interest
• Total amount repaid
• Loan term
• Principal reduction
• Expected cash flow
• Ability to make additional repayments

A mortgage calculator can help demonstrate this difference. MoneySmart specifically recommends considering both the repayment amount and total cost when comparing loan terms.

Lower repayments can come at a high price

A lower monthly payment can feel like a saving, but it may simply mean that you are spreading the debt across a much longer period.

In other words:

Lower repayment ≠ lower cost.

That distinction is one of the most important things to understand before committing to a 40-year mortgage.

40-Year Mortgage vs 30-Year Mortgage

The difference between a 30-year and 40-year mortgage is not simply another 10 years on paper.

Those additional years can materially affect your overall financial position.

The right choice depends on your circumstances, but the longer term should not be viewed as “free affordability.”

The Impact on Your Long-Term Wealth

Your mortgage is one of the largest liabilities most households will ever have.

Taking longer to repay that liability can affect how quickly you build equity in your home.

This matters because home equity can contribute to your overall net worth.

A longer mortgage may mean:

• More interest paid to the lender
• Slower reduction of the principal
• Slower accumulation of home equity
• Less flexibility later in life
• A mortgage that extends further into retirement

This is particularly important for younger borrowers who may assume that they have plenty of time to repay the loan.

Forty years is a very long financial commitment.

What Happens If Interest Rates Rise?

A longer mortgage does not eliminate interest-rate risk.

If you have a variable-rate loan, your repayments can change when interest rates change. The Reserve Bank explains that its cash rate influences other interest rates, including mortgage rates.

This means borrowers should not assess affordability using today’s repayment alone.

Instead, consider:

• What happens if your interest rate increases?
• Could you still afford the repayments?
• What happens if your household income falls?
• Could you handle higher living costs?
• Do you have an emergency cash reserve?

MoneySmart recommends testing mortgage affordability against higher interest rates rather than assuming current rates will remain unchanged.

When Could a 40-Year Mortgage Make Sense?

A 40-year mortgage is not automatically a bad financial decision.

There may be circumstances where the additional flexibility is useful.

For example, a borrower may deliberately choose a longer term because they:

• Have irregular income
• Want greater cash-flow flexibility
• Expect their income to increase
• Plan to make additional repayments
• Want to maintain a larger emergency buffer
• Have a specific investment or financial strategy

However, the strategy needs to be intentional.

The danger is taking a 40-year loan simply because it is the only way to purchase a property that is otherwise unaffordable.

Questions to Ask Before Taking a 40-Year Home Loan

Before signing a long-term mortgage, consider the bigger financial picture.

Ask yourself:

1. What is the total cost of the loan?
2. How much interest will I pay over 40 years?
3. Could I afford the property with a shorter loan term?
4. What happens if interest rates rise?
5. How much equity will I build during the first five or ten years?
6. Will the mortgage extend into retirement?
7. Could I make additional repayments?
8. Does buying this property make sense based on my overall financial position?

The decision should be based on more than whether the bank is willing to lend you the money.

Don’t Confuse Borrowing Capacity With Affordability

One of the biggest mistakes borrowers can make is treating their maximum borrowing capacity as their ideal borrowing amount.

Just because a lender says you can borrow a certain amount does not necessarily mean you should.

Your personal budget should account for:

• Mortgage repayments
• Council rates
• Insurance
• Utilities
• Maintenance
• Other debts
• Household expenses
• Emergency savings
• Future financial goals

A mortgage that leaves you with no room in your cash flow can become a significant financial burden.

How Can You Reduce the Cost of a Long Mortgage?

If you do take a longer-term mortgage, there may be ways to reduce the overall interest cost.

Depending on your loan conditions, you could consider:

• Making additional repayments
• Paying fortnightly rather than monthly where appropriate
• Using an offset account
• Refinancing when appropriate
• Reviewing your interest rate
• Increasing repayments when your income rises

However, check your loan terms for fees, restrictions or other conditions before making changes.

The goal should be to use the longer term for flexibility, rather than automatically taking the full 40 years to repay the debt.

The Bottom Line: Are 40-Year Mortgages Worth It?

A 40-year mortgage can make monthly repayments more manageable, but that flexibility comes at a cost.

The longer you carry the debt, the more interest you may pay and the longer it can take to build meaningful equity.

For some borrowers, a longer loan term may be a strategic way to manage cash flow. For others, it could simply allow them to borrow more than they can comfortably afford.

The key question is not:

“Can I afford the monthly repayment?”

It is:

“Can I afford this property and this debt over the long term?”

Before making that decision, look at the complete numbers rather than focusing only on today’s repayment.

Frequently Asked Questions About 40-Year Mortgages

Are 40-year mortgages available in Australia?

Some Australian lenders offer extended mortgage terms, although availability, eligibility and conditions vary between lenders. Borrowers should check the specific product terms rather than assuming a 40-year option will be available to them.

Is a 40-year mortgage cheaper than a 30-year mortgage?

Usually, no. A longer loan term can reduce the required repayments but generally increases the total interest paid over the life of the loan.

What is the biggest disadvantage of a 40-year mortgage?

The major disadvantage is the additional interest that can accumulate over the longer repayment period. It can also slow down the rate at which you build equity in the property.

Can you pay off a 40-year mortgage early?

Potentially, yes. Depending on the loan’s terms and conditions, you may be able to make additional repayments or refinance. Check whether your lender applies any fees or restrictions.

Should first-home buyers consider a 40-year mortgage?

It depends on their individual circumstances. A longer term may improve short-term cash flow, but first-home buyers should carefully assess the total interest cost, future affordability and whether they can comfortably manage the debt.

Should I speak to an accountant before taking a mortgage?

An accountant can help you understand the broader financial and tax implications of a property decision, particularly if the property is being purchased as an investment or through a business or investment structure. However, mortgage product and lending advice should come from an appropriately licensed finance professional.

Make Better Financial Decisions With Latitude Accountants

A mortgage is more than a monthly repayment. It can affect your cash flow, debt position, investment strategy and long-term financial goals.

At Latitude Accountants, our team provides practical accounting, taxation and business advisory support to help Australians make informed financial decisions. John Saade, FCA, CEO and Co-Founder of Latitude Accountants, has more than 20 years of experience advising Australian small and medium-sized business owners on accounting, tax, structuring and business decisions.

If you want to understand how a major financial decision could affect your broader financial position, speak with the Latitude team.

📍 Sydney Olympic Park | Marrickville | Melbourne | Loxton
📞 1300 706 597
📧 info@latitudeaccountants.com.au

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Disclaimer

This article is provided for general information only and does not constitute personal financial, credit, tax or investment advice. Mortgage products, interest rates, lending criteria and individual circumstances vary. Before making a property or borrowing decision, consider obtaining advice from appropriately qualified and licensed professionals who can assess your specific circumstances.