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Most home buyers focus on interest rates, and that makes sense. Rates are in the news, they affect your repayments, and they’re easy to compare. But there’s another factor that has a more direct impact on what you can actually borrow, and it gets far less attention.

Borrowing capacity is the maximum amount a lender will approve you for, based on their full assessment of your financial position.

In 2026, with rates elevated and APRA’s lending rules tightened, understanding your borrowing capacity matters more than watching every RBA move.

The difference between the two

Interest rates affect what a loan costs you each month and over the life of the mortgage.

Borrowing capacity sets the ceiling on what you can borrow in the first place.

A lower rate might reduce your repayments on a given loan size. But if your capacity caps out at $650,000 and the property you want is $900,000, the rate is almost irrelevant.

The two are related, but they’re not the same thing.

Why you’re assessed at a rate higher than you’ll actually pay

This is the part that catches a lot of buyers off guard.

APRA requires all regulated lenders to assess your loan at your actual interest rate plus 3 percentage points; that’s the serviceability buffer.

With typical variable rates sitting around 6.25% to 6.5% right now, lenders are running the numbers as though you’re paying 9.25% to 9.5%. That’s the repayment level they need to be confident you can handle.

On an $800,000 loan, the difference between repayments at 6.3% and 9.3% is significant. The buffer is there for a reason, but it does meaningfully reduce how much you can borrow relative to what your actual repayments would look like.

From February 2026, APRA also introduced a debt-to-income limit. Most lenders are now capping loans at 6 times gross income, with a limit on how much of their new lending can exceed that threshold.

For a household on $120,000 combined, that’s roughly a $720,000 ceiling regardless of the buffer calculation.

Why two people on the same income can get very different results

This is something we see regularly, and it surprises a lot of people.

Two borrowers with identical salaries can get significantly different approvals depending on a few key things:

• Living expense benchmarks: Lenders use internal models to estimate your living costs. Some are more conservative than others, which directly reduces the income they’ll count toward serviceability.
• Existing debts and credit limits: Personal loans, car finance, HECS debt, and even credit card limits you never use all reduce your assessed capacity. A $10,000 credit limit is treated as a potential $10,000 liability.
• How your income is treated: Casual income, self-employment income, bonuses, and rental income are all handled differently by different lenders. Some shade these figures heavily.
• Lender policy differences: The gap between the most and least generous lender for the same borrower can be $80,000 to $120,000 in maximum loan size.

That last point is worth sitting with for a moment. Going directly to one bank gives you one interpretation of your borrowing capacity. Working with a broker means your application gets assessed across a wider range of lenders, and you find out where you’re likely to get the best outcome.

What you can do to improve your position

There are a few things that can genuinely shift the number before you apply.

• Reduce unused credit limits: Cancel cards or lower limits you don’t need. Every dollar of available credit counts against you.
• Clear small debts where possible: Personal loans, BNPL accounts, and car finance all reduce your assessed serviceability. Getting rid of them before applying can make a real difference.
• Keep your income stable: Lenders generally want two or more years of consistent income. Changing jobs or going self-employed close to an application can complicate things.
• Get pre-approval before you start searching: This gives you a confirmed number to work with. It also flags any issues in your profile while there’s still time to address them.

Rates matter, but your borrowing capacity is what actually determines your buying range.

Knowing that number and knowing which lender is likely to assess your situation most favourably puts you in a far stronger position than going into the market blind.

We work with buyers across Australia and can show you where you stand across a wide panel of lenders. If you’d like to understand your actual borrowing power, get in touch with the NMC Finance team.

This blog is intended for general informational purposes only. For personalised advice tailored to your unique financial situation, please contact NMC Finance.