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By Nojan Rahimi, principal broker at Blutin Finance — 14+ years in finance, MFAA-accredited.
Information current as of 25 June 2026.
An interest-only home loan lets you pay only the interest for a set period, usually up to five years for owner-occupiers, while the amount you borrowed stays exactly where it started. Your repayments are lower during that window. The trade-off is real: you pay more interest over the life of the loan, you build no equity through repayments, and your repayments jump sharply when the interest-only period ends. It suits some situations and carries genuine risk in others. Here is how it works, what it actually costs, and who it tends to suit.
With an interest-only loan, your repayments cover only the interest the lender charges, not the principal you borrowed. For the interest-only period, the loan balance doesn’t move. A $500,000 loan is still $500,000 at the end of the interest-only term.
When that period ends, the loan reverts to principal and interest (P&I) for the rest of the term. Now you’re repaying the full balance over fewer years, so the repayments step up, often steeply.
Interest-only is a structure, not a separate product. The same lender, the same property, the same rate can be set up as interest-only or principal and interest. What changes is what your repayment buys you each month.
Most interest-only loans run in two phases.
Phase one is the interest-only period. For owner-occupiers, lenders usually cap this at five years. For investors, it can run longer, sometimes across multiple interest-only terms totalling 10 to 15 years, subject to the lender’s policy and a fresh assessment each time you extend.
Phase two is principal and interest for the remaining term. If you took a 30-year loan with a five-year interest-only period, you repay the full balance over the remaining 25 years. The shorter the time left to clear the same balance, the higher the repayment.
You can sometimes extend the interest-only period, but it isn’t automatic. The lender re-assesses you, and extending pushes the repayment increase further down the track rather than removing it.
Numbers make the trade-off concrete. Here is an illustrative comparison, not a quote, on a $500,000 loan at, say, 6.00% p.a. over a 30-year term, with the rate held constant for clarity:
Two things widen that gap in the real world. Lenders usually price interest-only at a premium, so the rate is often higher than the P&I rate, not the same. And if rates have risen by the time your interest-only period ends, the revert repayment climbs further. This example holds the rate flat to isolate the structure. Reality rarely does.
Interest-only is common among investors and rare among owner-occupiers, and that split tells you what it’s actually for.
Around 40% of new investor lending has been interest-only since 2018, compared with just 8 to 12% for owner-occupiers (RBA, Bulletin, May 2026). Interest-only is largely a cash-flow and tax-timing tool for investors, not a way to afford a home you otherwise couldn’t.
For investors, interest-only can make sense where the goal is to keep outgoings low while rent and any tax position do the work, to preserve cash for other purposes, or while holding a property through a particular phase. Whether interest is deductible against rental income, and whether negative gearing or portfolio building suits your position, are questions for your accountant or a financial adviser. That’s their lane, not ours. We structure the loan; we don’t advise on tax or investment strategy.
For owner-occupiers, the honest answer is that interest-only is rarely the right long-term call. It can help through a genuine, temporary squeeze: a period of reduced income such as parental leave, study or a career change, a renovation, or a short stretch where cash flow is tight, on the understanding that you’ll move to principal and interest and start clearing the debt. Used as a way to buy more house than the repayments support, it usually just delays the problem and adds to the cost.
This is where The Quick No earns its keep. If interest-only would set you up to fail when the loan reverts, a good broker tells you before you sign, not after.
The benefits are straightforward. Lower repayments during the interest-only period free up cash flow. For an investor, that can support holding costs or other commitments. For an owner-occupier in a genuine short-term squeeze, it can buy breathing room.
The risks are equally concrete, and they matter more.
And here is the point many borrowers miss: lenders don’t assess you on the low interest-only repayment. They assess your ability to repay on a principal-and-interest basis over the remaining term, at an interest rate three percentage points above the actual rate. That’s the APRA serviceability buffer, set by the Australian Prudential Regulation Authority. The loan has to stack up against the harder number, not the easy one.
Every loan quote comes with a comparison rate, designed to fold in fees so you can compare like with like. For interest-only, read it with care.
The comparison rate is calculated on a standard $150,000 principal-and-interest loan over 25 years. An interest-only structure doesn’t behave like that loan. Because the comparison rate assumes you’re paying down principal the whole way, it can understate what an interest-only loan actually costs you over its life.
Use the comparison rate as a rough sorting tool. For interest-only, the number that matters is the total interest across both phases, the interest-only period and the revert to principal and interest, on your actual loan size and term.
The repayment increase, sometimes called repayment shock, is predictable. That makes it manageable if you plan for it.
Interest-only loans can carry the same features as principal-and-interest loans, and the features matter more here, not less.
An offset account holds savings against your loan balance and reduces the interest charged. On an interest-only loan, where you’re not reducing principal through repayments, an offset is one of the few levers that lowers your real cost.
Redraw lets you access extra repayments you’ve made. On a variable loan, it gives you flexibility to pay ahead and pull funds back if needed.
Fixed versus variable is the usual trade-off. Fixed gives repayment certainty for a set term. Variable gives flexibility and usually allows unlimited extra repayments. Fixed interest-only loans often restrict extra repayments, which removes one of your main tools for softening the revert, so weigh that before fixing.
Interest-only generally comes with tighter criteria than principal and interest, because lenders treat it as higher risk. They assess the usual things, your income, expenses, existing debts and credit history, then apply stricter limits for interest-only on top.
Expect a lower maximum loan-to-value ratio (LVR). Many lenders cap interest-only at 80% or 90% LVR, policy-dependent, so you may need a larger deposit than you would for a P&I loan. Borrowing above 80% usually means Lenders Mortgage Insurance , which protects the lender, not you, and adds to your cost.
Serviceability is tested on principal and interest at the buffered rate, as above. You need to show you can afford the higher P&I repayment, not just the interest-only one.
Policies vary widely between lenders. One lender’s cap, term limit, or pricing on interest-only can differ sharply from the next. That spread is the reason to compare. We work across 45+ lenders , from the major banks to mid-tier and specialist non-bank lenders, and over 95% of the applications we submit get approved, because we run an Honest Assessment against the right lenders’ policies before anything goes in.
You’re not locked in. You can switch off interest-only early, or extend it, depending on your situation and your lender’s policy.
Switching to principal and interest early starts you clearing the balance sooner and reduces total interest, at the cost of higher repayments now. Extending interest-only keeps repayments low for longer but pushes the revert, and the cost, further out.
Either way, weigh the fees. Refinancing to another lender can carry discharge fees on the old loan and break costs if you’re exiting a fixed rate. The saving has to clear those costs to be worth it. That’s the same test we apply to any refinance: does the benefit recover the switching cost within a sensible window?
Yes, almost always. During the interest-only period you’re not reducing the balance, so you’re charged interest on the full amount for longer, and interest-only rates often carry a premium over P&I rates. On a $500,000 loan, five years of interest-only can cost roughly $37,000 more in interest over the life of the loan than going principal and interest from the start (illustrative, at a flat 6.00% p.a.). The exact gap depends on the interest-only length, the rate difference, and what you do with the cash you free up. Invest or offset it productively and the picture changes; simply spend it and the loan just costs more.
During the interest-only period, your loan balance stays flat, so you build equity only if the property’s value rises, not through your repayments. Equity is the gap between what the property is worth and what you owe. On a principal-and-interest loan, that gap widens two ways: prices may rise and your debt falls. On interest-only, you’re relying on price growth alone, which isn’t guaranteed. If values fall while your balance sits still, your equity can go backwards, and in a sharp downturn you can owe more than the property is worth.
Yes. You can sell or refinance at any point during the interest-only period. If you’re selling, the loan is repaid from the proceeds like any other mortgage. If you’re refinancing, you might move to a better rate, switch to principal and interest, or, where it fits, set a new interest-only term with another lender. Watch for costs: discharge fees on the existing loan, and break costs if you’re exiting a fixed rate. Any new lender will re-assess your serviceability on a principal-and-interest basis at the buffered rate.
Possibly, but that’s a question for your tax adviser or the ATO, not your broker. Investors may be able to claim loan interest against rental income, which is one reason interest-only appeals to some investors. Whether it applies to you, and how, depends on your circumstances and current tax rules. That’s their lane, not ours. We can structure the loan and compare lenders; we don’t give tax advice. Get the tax position confirmed independently before you build it into your plans.
You’ll usually need a lower LVR (a larger deposit) for interest-only than for principal and interest. Many lenders cap interest-only at 80% or 90% of the property value, subject to their policy, so a deposit of at least 10% to 20% is common, and the exact figure varies by lender and borrower type. Borrowing above 80% generally triggers Lenders Mortgage Insurance, which adds to your cost. Because interest-only policies differ widely between lenders, the deposit one lender wants can differ from the next, which is exactly why it’s worth comparing before you apply.
For owner-occupiers, the maximum is typically five years. For investors, it’s often longer, sometimes 10 to 15 years across multiple interest-only periods, subject to the lender’s policy and a fresh assessment each time you extend. When the interest-only term ends, the loan reverts to principal and interest for the remaining years. Extending is possible with some lenders but never automatic, and each extension pushes the higher repayments further down the track rather than removing them.
For owner-occupiers, the maximum is typically five years. For investors, it’s often longer, sometimes 10 to 15 years across multiple interest-only periods, subject to the lender’s policy and a fresh assessment each time you extend. When the interest-only term ends, the loan reverts to principal and interest for the remaining years. Extending is possible with some lenders but never automatic, and each extension pushes the higher repayments further down the track rather than removing them.
Interest-only can be the right tool or an expensive mistake, and the difference is in the detail of your numbers. Before you commit, it’s worth seeing both phases modelled against your actual loan, the interest-only period and the revert to principal and interest, and comparing how different lenders price and structure it.
That’s a 30-minute first meeting. We’ll run an Honest Assessment, model the revert so there are no surprises, and compare across our 45+ lenders. If interest-only doesn’t fit your situation, we’ll tell you. No obligation, no fee, no paperwork before the call.
Book a time at calendly.com/blutinfinance/first-meeting-website , or call 1300 188 808. We’re an independent brokerage in Bundoora , serving Melbourne’s northern suburbs.