If you’ve already got a home loan with one of the big four, the obvious move for your first investment property is to call the same bank. You know them, they know you, and the paperwork takes half as long. For a single property held over the long term, that decision usually works out fine.
But the moment you start thinking about a second property, the bank you trust quietly becomes the ceiling on how far your portfolio can grow. One lender means one credit policy and one serviceability calculator, which means one view of how much you can borrow. You don’t see that ceiling until you’ve already hit it.
This guide walks through what investors actually need from a lender when they’re building a portfolio: where banks work, where they fall short, and the structural decisions that compound over your second, third, and fourth purchase. Honest treatment of both sides, including where a bank still makes sense.
What a bank offers (and where it works)
Banks aren’t the enemy here, and for the right situation, going direct makes plenty of sense.
Where a bank works well:
- Existing relationship. You’ve had your home loan, savings, and credit card with them for a decade. They know your income, your spending patterns, and your repayment history. That history can mean faster processing and sometimes preferential pricing.
- Bundled products. Offset accounts, package discounts, credit cards with fee waivers. Banks bundle these to reward consolidated lending. If you have a professional package with a 0.1-0.15% rate discount, that’s real money.
- Direct communication. When something goes wrong mid-application, you’re talking to the lender directly rather than a middleman relaying messages. For some borrowers, that directness matters.
- Private banking access. If your combined lending is above $750K-$1M, some banks give you a dedicated relationship manager. That level of service can be hard to replicate.
Where a bank falls short for investors:
- They can only offer their own products. CBA can’t recommend an ANZ loan, even if ANZ’s credit policy would approve you for $80,000 more. A bank is one lender. Full stop.
- No cross-lender portfolio strategy. When you hold two or three investment properties, structuring loans across different lenders maximises your borrowing capacity. Your bank will always recommend consolidating everything with them, because that’s in their interest. It’s not necessarily in yours.
- Serviceability calculators vary. Some banks are more conservative than others. If your bank’s calculator says no at $600K, another lender’s might say yes at $650K using the same income and expenses. You won’t know this unless you look beyond your bank.
- Limited ongoing management. After settlement, the relationship is largely transactional. You might hear from them if they’re running a retention campaign. Otherwise, silence.
For a straightforward, single-property, owner-occupied loan, a bank can be fine. Once you add the complexity of investment property, the limitations start to bite.
What a broker offers (and why it matters for investment)
The value of a broker goes well beyond finding a rate, and for investors, three things matter most.
Access to 30+ lenders
Not just 30 different rates. Thirty different credit policies, serviceability models, and product structures.
This matters for investors specifically because lenders treat investment lending differently from each other in ways that change what you can actually borrow:
- Different lenders treat rental income differently. Some shade it at 80% for serviceability calculations, others at 70%. On a portfolio generating $40,000 in rent, that’s a $4,000 gap in recognised income, which translates to roughly $20,000-$30,000 of borrowing capacity depending on which lender’s calculator you’re sitting in front of.
- Different lenders have different DTI thresholds. One lender might cap you at a 6x debt-to-income ratio, another at 7x. When you’re buying property two or three, that difference determines whether you can borrow at all.
- Some lenders are more favourable for interest-only lending. IO terms, qualifying criteria, and rates vary substantially. A broker knows which lenders are writing competitive IO terms this month, because it changes.
A broker matches you to the lender whose policy fits your situation. Not just the one with the lowest advertised rate, but the one that actually approves you for the amount you need on terms that suit your investment strategy.
Best-interest duty
Since January 2021, brokers have been legally required to act in your interest, not the lender’s. This is the best-interest duty under the National Consumer Credit Protection Act.
Banks have no equivalent obligation. They sell their own products. A broker has to demonstrate that the loan they recommended is in your best interest.
The numbers back it up
77.6% of all new residential lending in Australia now flows through mortgage brokers (June 2025, MFAA data). That share has grown every year for the past decade. If brokers consistently delivered worse outcomes, that number would be heading the other direction.
The portfolio argument: why investors need a broker more than home buyers do
This is where the broker-vs-bank decision looks fundamentally different for investors than for someone buying a home to live in.
If you’re buying one property and holding it for 25 years, the rate is the main variable, and going with whichever option fits your situation is probably fine. If you’re building a portfolio (even just two or three properties), the broker relationship creates structural advantages that compound over time.
Lender diversification
Spreading loans across multiple lenders maximises your borrowing capacity, because different lenders assess existing debt differently. When Property 1 sits with Lender A, Lender B assesses that debt at face value and applies their own serviceability model to determine how much more you can borrow.
Consolidating everything with one bank works the opposite way. They see all your debt on their books and apply a single serviceability model. That model might be conservative, and you won’t know until they say no.
A broker maps the optimal lender allocation across your portfolio. Property 1 with the lender whose serviceability gives you the most headroom. Property 2 with the lender whose credit policy suits your updated debt position. Property 3 follows the same logic.
Your bank wants all your lending. Your broker wants the right lender for each loan.
Borrowing capacity modelling
Most investors don’t think about this until they’re stuck: how you structure Property 1 directly affects whether you can buy Property 2.
A principal-and-interest loan at 80% LVR gives you maximum equity growth. An interest-only loan at 90% LVR minimises your repayments and preserves cashflow for the next deposit. Neither is universally right, and the answer depends on your income, your timeline, and your goals.
A broker thinks about Property 3 when structuring Property 1. A bank structures Property 1 in isolation.
Interest-only strategies
Interest-only periods make sense for many investors, because lower holding costs improve cashflow and the interest is fully tax-deductible on investment debt. But IO terms vary significantly across lenders.
Some offer 5-year IO periods, others cap at 3 years for investors. Rates on IO can run 0.2-0.5% above P&I at the same LVR, and the gap shifts by lender and by month. A broker knows which lenders are offering competitive IO terms right now and which ones have tightened their criteria. This is not something you can Google once and rely on.
Offset vs redraw decisions that affect tax
For investment loans, the distinction between offset and redraw isn’t a feature comparison. It has tax implications.
If you push surplus cash into an investment loan via extra repayments and later redraw it for personal use, the interest on the redrawn amount may not be deductible anymore, because the purpose of the borrowing has changed. An offset account on an investment loan keeps your cash liquid and accessible without affecting deductibility, because the loan balance never changes.
This is the kind of structural detail that matters for investors but rarely surfaces in a standard home loan conversation. A broker who works with investors every day catches it. A bank lender processing their twentieth application this week often doesn’t.
For more on how loan structure affects your tax position, see our guide on debt recycling in Australia.
What about rates? Do brokers actually get better deals?
Honest answer: brokers access the same rates as banks. Sometimes broker-exclusive products come through that aren’t available on the bank’s direct channel, and sometimes a bank’s retention team matches or beats a broker rate to keep a customer.
The rate difference between broker and bank channels is usually small, in the range of 0.05-0.15% either way. Meaningful on large loans, but not the main reason to choose one path over the other.
The data tells the real story: 77.6% of all new residential lending flows through brokers. If brokers consistently delivered worse rates, that market share wouldn’t exist.
Rate matters. But for investors, it’s not the whole picture. On a $600K loan, a 0.2% rate difference is $1,200 per year. That’s real money.
But the structural decisions around a loan (lender selection, IO vs P&I, offset strategy, how your borrowing capacity is preserved for the next purchase) often have a bigger long-term financial impact than the rate.
A 0.2% better rate on a poorly structured loan is still a worse outcome than a 0.2% higher rate on a loan that’s structured for portfolio growth.
Consider a practical example. Investor A gets a 5.89% rate, and their broker structures the loan to preserve maximum borrowing capacity. Investor B gets 5.79% from their bank, but the structure leaves them $80K short of qualifying for their next purchase.
Investor A buys Property 2 eighteen months sooner, and the capital growth on that second property makes the 0.1% rate difference look like a rounding error.
The “disadvantages” of a broker (addressed honestly)
No honest comparison dodges the downsides. Here are the real concerns and the honest responses.
”Broker commissions create conflicts”
Brokers earn a commission from the lender when your loan settles. Typically 0.6-0.7% of the loan amount upfront, plus a trailing commission of around 0.15-0.2% per year. You don’t pay the broker directly.
The concern is valid on its surface: does the broker recommend the lender that pays the highest commission? Under best-interest duty legislation, they’re legally required not to. Commission structures are disclosed.
The legislation was specifically designed to address this conflict. It’s not a perfect system, but it’s a regulated one, and it’s more than banks are required to do when recommending their own products to you.
”Adding a middleman slows things down”
It can, if the broker is disorganised. A good broker actually speeds things up by knowing exactly which lender to submit to, what documentation they need, and how to package the application to avoid back-and-forth. A poor broker creates delays.
That’s a broker quality issue, not a broker model issue.
”Quality varies widely”
True, and this is the legitimate concern. Not all brokers are investment specialists. Many handle a couple of investment loans a year between a stack of owner-occupier refinances. They might not understand multi-lender strategy, or borrowing capacity modelling, or the nuances of IO terms across different lenders.
The fix isn’t to avoid brokers. It’s to find one who specialises in investment lending.
The one real disadvantage
If you have a strong existing bank relationship with private banking access, significant package discounts, and a relationship manager who picks up the phone, consolidating with that one lender can make financial sense. The rate discount, fee waivers, and service level may outweigh the portfolio benefits of a broker.
This is most relevant for investors with substantial lending (typically $1M+) at a single institution. If that’s your situation, compare what the bank is offering against what a broker recommends. It’s worth checking, and a good broker won’t be offended by the comparison.
What happens after settlement (and why this is the real difference)
Most content about broker vs bank focuses on the application process. Get the loan. Settle. Done.
For investors, the post-settlement period is where the real value shows up, or doesn’t.
With a bank
The relationship is transactional. Your loan settles, you make repayments, and if a better rate appears on the market nobody calls you. If your fixed rate is about to expire, you might get a generic letter offering their current variable rate.
Ring and threaten to leave, and you’ll get a retention offer (usually 0.1-0.3% off your rate). That’s the extent of proactive management.
Meanwhile, the loyalty tax (the penalty for not actively negotiating) averages around $1,070 per year for Australian borrowers. That’s money you lose by not paying attention, and your bank isn’t going to flag it for you.
With a generalist broker
Slightly better. Some will check in around the anniversary of your loan. Most won’t proactively monitor whether a better rate or product has appeared, because they’ve moved on to the next application.
With a proactive, investment-focused broker
Your loans get monitored against the market continuously. When a better rate appears (one that would save you real money after accounting for switching costs) you hear about it before you ask.
When your fixed rate expiry approaches, refinance options are already being assessed. When property values shift and new equity becomes accessible, it surfaces as an opportunity rather than something you stumble across six months later.
The loyalty tax never sneaks up on you. Your portfolio stays optimised. And when you’re ready for the next purchase, your borrowing position is already mapped.
Most brokers disappear after settlement. The question isn’t broker vs bank. It’s what kind of broker.
This is where Approov is built differently. The platform monitors your loans against the market 24/7, so rate drops, refinance windows, and equity changes surface proactively.
Not because you chased, but because the system caught it. Your broker brings the strategy. The AI keeps watch so nothing slips through the cracks.
How to choose a broker for investment property
Not every broker is the right broker for investment lending. Here’s what to look for, and what to watch out for.
What matters:
- Investment lending volume. How many investment loans do they write per month? A broker who handles two a year between thirty owner-occupier refinances isn’t an investment specialist.
- Loan structuring expertise. Do they talk about borrowing capacity across multiple properties? Do they understand lender diversification? Can they explain why Property 1’s structure affects Property 2’s approval?
- Lender panel breadth. At least 30-40 lenders. Narrow panels mean fewer options, which defeats the purpose.
- Ongoing management capability. What happens after settlement? Do they monitor your loans? Will they flag a better rate, or do they wait for you to call?
- Understanding of investor-specific strategies. Interest-only lending, debt recycling, offset vs redraw for tax purposes, lender selection based on rental income shading.
Questions to ask:
- How many investment loans do you write per month?
- How do you structure loans for portfolio growth?
- What happens after my loan settles?
- How do you decide which lender to recommend, and how do you factor in my next purchase?
Red flags:
- Broker only talks about rate. Never mentions structure, capacity, or lender selection criteria.
- Doesn’t ask about your investment goals. Treats the investment loan the same as a home loan.
- Can’t explain how your current loan structure affects your borrowing capacity for the next purchase.
- No post-settlement process. The relationship ends at settlement.
Finding the right broker is worth the effort. The wrong one costs you more than going to the bank would have.
The bottom line
For investment property, the broker model is structurally better. Lender access across 30+ options. Portfolio-level strategy that a single bank can’t provide. Ongoing management that protects you from the loyalty tax and keeps your loans working as hard as your properties do.
The bank model still works for straightforward, single-property lending. And if you have genuine private banking access with strong package discounts, it’s worth comparing.
For most investors (especially those thinking beyond one property) a broker who specialises in investment lending isn’t a nice-to-have. It’s a structural advantage that compounds with every purchase.
The real question isn’t broker vs bank. It’s whether your broker thinks about your portfolio the way you think about your portfolio.
See what an investment-specialist broker does differently. Get your numbers from Approov. We’ll map your borrowing position across 30+ lenders, model your options, and show you what your next purchase looks like, structured for the one after that.
Or if you want to understand how we’re different from a traditional broker, see how Approov works.
Frequently asked questions
Is it better to go through a broker or a bank?
For a straightforward owner-occupier home loan, a bank can work fine, especially if you have a strong existing relationship. For investment property, a broker is structurally better positioned. Brokers access 30+ lenders, match you to the lender whose credit policy suits your situation, and can structure loans across multiple lenders for portfolio growth. 77.6% of all new residential lending in Australia now flows through brokers.
What are the disadvantages of using a mortgage broker?
The main concerns are commissions (though best-interest duty legislation requires brokers to act in your interest, not the lender’s), the risk of a middleman slowing things down (though a good broker speeds up the process by knowing which lender to target), and broker quality varying widely. If you have private banking access or significant package discounts, consolidating with one lender may make more sense.
Do mortgage brokers get you better rates?
Brokers access the same rates as banks, sometimes with broker-exclusive products. The rate difference is usually small. The bigger value for investors sits in lender selection, loan structure, and ongoing management. On a $600K loan, 0.2% is about $1,200 per year, but the structural decisions around a loan (which lender, IO vs P&I, how borrowing capacity is preserved) often have a bigger long-term impact.
Is a mortgage broker worth it for investment property?
For most investors, yes. Investment lending has specific requirements that a single bank can’t serve. Different lenders treat rental income differently, have different DTI thresholds, and offer different terms on interest-only lending. A broker matches you to the right lender for your situation. For portfolio investors, brokers also provide lender diversification, borrowing capacity modelling, and ongoing rate monitoring.
How do mortgage brokers make money?
Brokers earn a commission from the lender when your loan settles. Typically 0.6-0.7% of the loan amount upfront, plus a trailing commission of around 0.15-0.2% per year. You don’t pay the broker directly. Under best-interest duty legislation, brokers must recommend the loan that’s in your interest, not the one that pays the highest commission. Commission structures are disclosed before you proceed.
Should I use the same broker as my home loan for investment?
If your current broker understands investment lending, portfolio strategy, and multi-lender structuring, yes. But many brokers specialise in owner-occupier loans and treat investment lending the same way. The right broker for investment property thinks about your next purchase when structuring the current one, understands interest-only strategies, and knows which lenders are most favourable for investors right now. If your current broker doesn’t ask about your investment goals, it’s worth talking to an investment specialist.
What does a mortgage broker do that I can’t do myself?
You can compare rates online and apply directly with a bank. What’s harder to do yourself: compare serviceability outcomes across 30+ lenders, identify which lender’s credit policy best fits your rental income and debt position, structure loans across multiple lenders to maximise borrowing capacity, monitor your loans against the market after settlement, and know which lenders offer the best terms for investor-specific products at any given time. That’s the broker’s job, and for investors, it’s where the real value sits.