It’s one of the most common questions buyers ask.

How much can I afford to spend on a home loan?

Most banks use affordability models that assess your income, expenses and credit profile to determine how much they're prepared to lend.

As a general benchmark, monthly bond repayments often fall within 25% to 30% of gross monthly income. However, this is a guide, not a hard rule.

There's an important distinction between what a bank is willing to approve and what is comfortable for you to repay.

The difference between approval and sustainability

Banks assess risk. They calculate whether you can meet repayments based on current income and declared expenses. Their models also factor in interest rate fluctuations and regulatory requirements.

But affordability on paper doesn't always reflect real life.

Your monthly repayment should factor in other responsibilities, like insurance, lights and water, school fees, transport costs, medical expenses, and daily living costs.

Over time, even the newest homes need a lick of paint or a leaky roof repaired.

This means that a bond that technically qualifies may still feel tight in practice.

Building in breathing room

A useful approach is to consider not just whether you can meet the repayment today, but whether you could still manage if interest rates rise or your circumstances change.

Interest rates move in cycles - and even a slight increase can weigh a little heavy on your monthly repayment. Planning for this possibility takes all the stress out of the equation.

It's also worth considering your longer-term goals. Do you want to continue investing? Start a business? Travel? Support family? A home loan shouldn't leave you in a tight financial corner.

Sustainable homeownership is about balance.

Fixed expenses vs lifestyle choices

A useful way to think about affordability is to separate essential fixed costs from discretionary spending. Fixed costs such as insurance, transport and school fees are unavoidable, whereas lifestyle expenses can be adjusted, even though they still form part of your overall financial wellbeing.

At BondExcel, we encourage a holistic view - the goal isn't to eliminate enjoyment, but to ensure your home loan doesn't crowd out the rest of your life.

Gross income vs take-home pay

Another common oversight is focusing on gross income rather than net income. Tax, retirement contributions and other deductions reduce the amount you actually have available each month.

A repayment that appears reasonable as a percentage of gross income may feel different when viewed against your take-home pay.

A responsible starting point

There's no universal percentage that works for every household. Some buyers are comfortable taking on more debt while others prefer a more conservative approach to keep things flexible.

What matters is understanding your full financial picture before committing.

At BondExcel, affordability conversations begin with pre-qualification. By submitting one application to multiple banks and comparing lending options, you gain clarity on a range of outcomes available.

More importantly, those conversations allow space to assess comfort, not just qualification.