Why do you need a mortgage broker — and why has it never mattered more?

Why does a broker matter more now than a few years ago?

A broker matters more now because comparing home loans has become a genuinely harder problem, not because the marketing got louder. Mortgage brokers settled a record 81% of new residential home loans in the March 2026 quarter, up from 74.1% two years earlier, according to the Mortgage and Finance Association of Australia. That is a big shift in a short time.

Two things sit behind it. The lender landscape is crowded and moves quickly, with dozens of banks and non-bank lenders changing their rates and rules often. And the way loans are assessed has tightened. That is exactly where a broker's skill comes in — knowing how to navigate that market and find the lender that best suits your individual scenario, weighing your income and borrowing power against the best rate actually available to you.

What is the serviceability buffer, and why does it change the maths?

The serviceability buffer is the extra margin a lender adds when it tests whether you can afford a loan. Home loan applications are assessed at your actual interest rate plus three percentage points, a setting that APRA has held since 2021. So a loan advertised near 6% may be assessed as if you were paying around 9%.

That gap is the reason your borrowing power can feel smaller than your income suggests. It also means different lenders can reach very different answers on the same application, depending on how they count your income, debts and living costs. A broker's job is to know where those differences sit, so you are not knocked back at one lender when another might have said yes, depending on your circumstances.

Is it really that hard to compare loans yourself?

You can compare loans yourself, but the number of moving parts has grown to the point where it is a real time cost. A single advertised rate rarely tells the full story once you factor in fees, offset accounts, redraw, loan-to-value tiers and each lender's assessment rules.

Here is what a broker is weighing up for you:

• The rate, but also the fees, features and fine print that sit around it
• How each lender treats your income, existing debts and expenses under the buffer
• Which lenders are more likely to approve your situation, so you avoid needless knock-backs that can mark your credit file
• Whether a fixed, variable or split structure suits what you are trying to do

None of this guarantees a better outcome. It simply widens the field you are choosing from.

Is Australia unusual in leaning on brokers this much?

Australia is now unusual, in a small club. It is one of only three countries in the world, alongside the United Kingdom and the Netherlands, where brokers originate more than 80% of home loans (MFAA, March 2026). Broker-arranged lending topped $124.88 billion in the March 2026 quarter alone, the highest volume ever recorded for a January to March period.

Those numbers are worth reading as a signal rather than a scoreboard. When most borrowers in a mature market choose to use a broker, it usually reflects that the do-it-yourself path has become harder, not that people have stopped caring about their money.

What should you actually expect from a good broker?

You should expect a broker to explain their reasoning, not just hand you a rate. A good one will walk you through why a particular lender fits your situation, what the loan will cost over time, and where the trade-offs are.

Fair questions to ask include how they are paid, how many lenders they can access, and whether they are acting in your best interests. In Australia, mortgage brokers are subject to a best interests duty, a legal obligation to put your interests first. It is reasonable to ask them to show how a recommendation meets it.

The bottom line

The rise of brokers is less a fashion and more a response to a harder problem: a fast-moving field of lenders, each pricing risk differently, that is genuinely tough to compare on your own. The value of a broker is not simply knowing the buffer exists — it is knowing how to navigate that market and find the lender that best suits your needs, weighing your income, your borrowing power and the rate on offer. Once the right lender has been identified, a broker can also attempt to price match that recommendation against rates from other lenders, so you are not just getting a suitable loan, you are getting it on the best terms available.

Common questions