Finance is different when buying an investment property: here’s what you need to know

Buying your first investment property? According to Westpac, investor finance is structured differently to a standard home loan, and it pays to understand how.

If you've owned a home before, you might assume that getting finance for an investment property works the same way.

And in many respects, it does.

But as Westpac sees it, there are some important differences that can catch first-time investors off guard and understanding them early can save you a lot of frustration down the track.

"The starting point of any financial discussion is understanding your position," Westpac Home Loan Specialist, Nicole Hill, says.

"That means looking at your current income, your existing commitments, and working out what you can comfortably afford."

Interest rates are higher for investors

The first thing most first-time investors notice is that investor loans come with a higher interest rate than owner-occupier loans.

This is standard across the industry and reflects the different risk profile lenders attach to investment lending.

Investing is about much more than just finding a property. Picture: Getty

In simple terms, lenders see investment loans as carrying more risk, partly because rental income can fluctuate and borrowers may prioritise repayments on their primary residence if finances come under pressure.

The gap isn't enormous, but it's worth factoring into your calculations before you commit.

How lenders assess your borrowing capacity.jtMhbqdisplay:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-box-pack:start;-webkit-justify-content:flex-start;-ms-flex-pack:start;justify-content:flex-start;-webkit-align-items:stretch;-webkit-box-align:stretch;-ms-flex-align:stretch;align-items:stretch;padding:0;/*!sc*/ .jtMhbq > *:not(:last-child)margin-bottom:16px;/*!sc*/ data-styled.g176[id="Stack__StackContainer-sc-agfvon-0"]content:"jtMhbq,"/*!sc*/ .eFWqPO.eFWqPObackground-color:var(--ck-backgroundPrimary);padding:20px 0;/*!sc*/ data-styled.g209[id="style__SEOFooterWrapper-sc-1j6h7ak-0"]content:"eFWqPO,"/*!sc*/ .dwSMrX.dwSMrXmax-width:1030px;padding:0px 15px;margin:auto;/*!sc*/ @media (max-width:1024px).dwSMrX.dwSMrXmax-width:658px;padding:0;/*!sc*/ @media (max-width:767px).dwSMrX.dwSMrXpadding:0px 15px;/*!sc*/ data-styled.g210[id="style__SEOFooterContainer-sc-1j6h7ak-1"]content:"dwSMrX,"/*!sc*/ .gNIfFx.gNIfFxcolor:var(--ck-textSecondary);margin-top:20px;/*!sc*/ data-styled.g211[id="style__SEODisclaimerText-sc-1j6h7ak-2"]content:"gNIfFx,"/*!sc*/ .hzOUpd.hzOUpdlist-style:none;display:block;-webkit-column-fill:auto;-webkit-column-fill:auto;column-fill:auto;-webkit-column-count:4;column-count:4;height:100px;display:block;overflow-x:hidden;/*!sc*/ .hzOUpd.hzOUpd lidisplay:list-item;/*!sc*/ .hzOUpd.hzOUpd afont-size:0.75rem;line-height:1rem;font-family:"Pangea","Helvetica Neue",Helvetica,Arial,sans-serif;font-variation-settings:"XTDR" 50,"APRT" 100,"SPAC" 40;font-weight:400;color:var(--ck-textSecondary);/*!sc*/ @media (max-width:1024px).hzOUpd.hzOUpd-webkit-column-count:3;column-count:3;height:150px;/*!sc*/ @media (max-width:767px).hzOUpd.hzOUpd-webkit-column-count:2;column-count:2;height:200px;/*!sc*/ .TswAe.TswAelist-style:none;display:block;-webkit-column-fill:auto;-webkit-column-fill:auto;column-fill:auto;-webkit-column-count:4;column-count:4;height:100px;display:none;overflow-x:hidden;/*!sc*/ .TswAe.TswAe lidisplay:list-item;/*!sc*/ .TswAe.TswAe afont-size:0.75rem;line-height:1rem;font-family:"Pangea","Helvetica Neue",Helvetica,Arial,sans-serif;font-variation-settings:"XTDR" 50,"APRT" 100,"SPAC" 40;font-weight:400;color:var(--ck-textSecondary);/*!sc*/ @media (max-width:1024px).TswAe.TswAe-webkit-column-count:3;column-count:3;height:150px;/*!sc*/ @media (max-width:767px).TswAe.TswAe-webkit-column-count:2;column-count:2;height:200px;/*!sc*/ data-styled.g212[id="style__TabContent-sc-1j6h7ak-3"]content:"hzOUpd,TswAe,"/*!sc*/ .epSGXp.epSGXp.epSGXp.epSGXp-ms-overflow-style:none;-webkit-scrollbar-width:none;-moz-scrollbar-width:none;-ms-scrollbar-width:none;scrollbar-width:none;/*!sc*/ @media (max-width:1024px).epSGXp.epSGXp.epSGXp.epSGXpmargin-right:calc(0px - ((100vw - 658px) / 2));/*!sc*/ @media (max-width:767px).epSGXp.epSGXp.epSGXp.epSGXpmargin-right:-1rem;/*!sc*/ .epSGXp.epSGXp.epSGXp.epSGXp ::-webkit-scrollbardisplay:none;/*!sc*/ data-styled.g418[id="styles__PlaylistStackContainer-sc-1gcgg89-1"]content:"epSGXp,"/*!sc*/ .hPzgAS.hPzgAS-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;width:318px;height:unset;margin:0;/*!sc*/ @media (max-width:767px).hPzgAS.hPzgASmargin:2.5rem 0 0 0;/*!sc*/ data-styled.g439[id="styles__FixedContent-sc-12allwc-1"]content:"fsWpYb,hPzgAS,"/*!sc*/

When assessing an investor loan, lenders look at your overall financial picture, not just the property you're buying.

That means your existing mortgage (if you have one), your other debts, your income, and your living expenses all come into play.

Lenders will also take rental income into account, but typically only a portion of it, usually around 70-80%. This approach takes into consideration potential vacancy periods and the ongoing costs of managing a rental property.

"People are sometimes surprised by how the rental income is factored in," says Nicole.

"It's not counted at face value. Lenders apply a buffer to make sure borrowers aren't overexposed if a property sits vacant for a period."

Interest-only vs principal and interest

One of the more meaningful decisions investors face is how their loan is structured, both in terms of the interest rate, and how repayments are made.

According to Westpac data from 2025, more than 98% of investors opted for variable rate loans, where the interest rate can move up or down over time in line with variable rate changes.

By contrast, a fixed rate locks in your interest rate for a set period, offering more certainty around repayments but less flexibility if conditions change.

Separate to that is how you choose to repay the loan.

Interest-only loans keep repayments lower in the short term, which can be useful for managing cash flow, particularly when you’re just getting started.

But they don’t reduce your debt over time, which means you’re relying more heavily on capital growth to build your equity position.

When investing, take time to think about what loan structure will work best for you and your goals. Picture: Getty

Principal and interest loans cost more each month, but you’re steadily paying down the loan and building equity along the way.

“There’s no one-size-fits-all answer here,” says Nicole.  

“It really comes down to your strategy, your cash flow position, and your long-term goals. That’s exactly the kind of conversation worth having with a lending expert before you make any decisions.”

The costs beyond the mortgage

One thing that catches many first-time investors by surprise is the full picture of costs involved in owning a rental property.

Gross rental yield (the headline figure you’ll often see quoted) is a simple way of measuring how much income a property generates relative to its value.

It’s calculated by taking the annual rent and dividing it by the property price, then expressing it as a percentage.

For example, if a property costs $800,000 and rents for $800 a week, that’s $41,600 a year in rental income. Divide that by $800,000, and you get a gross rental yield of 5.2%.

But it doesn’t account for additional expenses, such as maintenance, strata fees, insurance and property management costs, and so it can give a slightly inflated view of the actual return.

According to the PropTrack Westpac Investor Report 2026, in recent years, most of the rental income from a typical investment property has gone straight towards covering interest costs alone, before factoring in any other expenses.

That doesn't mean investment property isn't worth pursuing, of course. But going in with a clear-eyed view of the full cost picture is essential.

Where a lender comes in

Navigating all of this for the first time doesn't have to be overwhelming.

Westpac's Book a Banker tool lets you sit down with a home lending expert at a time that suits you, whether that's in a branch, at home, or wherever works best.

Westpac lenders help you from wherever is convenient - in a branch, or at home. Picture: Getty

"Our role is to help investors understand their options and move forward with confidence," says Nicole.  

"Whether you're just starting to explore the idea or you've already found a property you want to move on, having that conversation early makes all the difference."

Because when the right property comes up, the last thing you want is to be scrambling to sort your finances.

The investors who move quickly and decisively are usually the ones who did the groundwork first.

Things you should know:Westpac data: January to December 2025. Conditions, credit criteria, fees and charges apply. Residential lending is not available for Non-Australian Resident borrowers. This information is general in nature and has been prepared without taking your personal objectives, circumstances and needs into account. You should consider the appropriateness of the information to your own circumstances and, if necessary, seek appropriate professional advice. Any tax information described is general in nature and it is not tax advice or a guide to tax laws. We recommend you seek independent, professional tax advice applicable to your personal circumstances.© Westpac Banking Corporation ABN 33 007 457 141 AFSL and Australian credit licence 233714.