Interest Rates and Property Prices: The Pros and Cons

How Interest Rates Shape What You Can Borrow

Interest rates directly control how much you can borrow because lenders assess your capacity to service the loan at a rate higher than the quoted product rate. When rates move, your borrowing capacity moves with them.

Consider a buyer who earns $95,000 a year with no other debts or dependents. At a variable rate of 6.0%, that buyer might qualify for a loan around $540,000. If the rate drops to 5.5%, their borrowing capacity could increase by $30,000 or more, depending on the lender's assessment buffer. That shift can determine whether a buyer qualifies for a property at Secret Harbour's current median of $825,000 or needs to look elsewhere.

Lenders use a serviceability buffer of at least 3.0 percentage points above the loan product rate, as required by APRA. Your loan is assessed at the product rate plus that buffer, meaning a 6.0% variable loan is tested at 9.0%. If rates fall and the product rate drops to 5.5%, the test rate falls to 8.5%, and your serviceability improves. The reverse happens when rates rise. This buffer exists regardless of whether you choose a variable rate, fixed rate, or split loan.

What Rising Rates Do to Property Prices Over Time

Rising rates reduce what buyers can afford to borrow, which typically slows price growth or pushes values down. Falling rates do the opposite.

Secret Harbour sits in a coastal corridor where demand has stayed firm even during rate increases, supported by Perth's broader supply shortage and consistent interstate migration. REIWA forecast in early 2026 that Perth's median house price would rise by more than 10%, driven by population growth running at 2.2% while new home completions declined each quarter since late 2024. That imbalance means rate movements don't always translate into price drops the way they might in oversupplied markets.

When rates climbed through the last cycle, some suburbs saw prices flatten or dip slightly, but areas like Secret Harbour held value due to limited stock and strong local appeal. Buyers who waited for a correction often found themselves competing in a market where available listings dropped faster than prices did. The relationship between rates and prices depends heavily on local supply, and in suburbs where supply is tight, rate cuts can accelerate competition rather than reduce it.

The Timing Problem for First Home Buyers

First home buyers face a specific challenge when rates change. Lower rates improve borrowing capacity, but they also bring more buyers into the market, increasing competition for entry-level stock.

A buyer using the Australian Government 5% Deposit Scheme with a household income of $110,000 might qualify for a loan of $600,000 at current rates. If rates drop by 0.5%, that same buyer could borrow an additional $35,000 to $40,000, but they're now competing with dozens of other buyers whose capacity has also increased. In suburbs like Secret Harbour, where house supply is limited, that competition often pushes prices up faster than the borrowing capacity gain.

The Western Australian Government's revised stamp duty concessions from 7 May 2026 now apply statewide, with no duty on homes valued up to $600,000 and a concessional rate on homes between $600,001 and $800,000. Combined with the $10,000 First Home Owner Grant for new builds under $800,000, these concessions help offset some of the cost pressure, but they don't remove the competition dynamic created by improved serviceability across the buyer pool.

Fixed Rates as a Hedge Against Future Increases

Fixed rates let you lock in a known repayment for a set term, typically one to five years. If variable rates rise during that period, you're protected. If they fall, you're locked in at the higher rate.

In our experience, buyers who fixed during the low rate window in early 2021 benefited as variable rates climbed sharply over the following two years. Buyers who fixed at the peak in late 2022 found themselves paying more than the variable rate once the Reserve Bank paused its increases. The decision depends on your tolerance for repayment volatility and your view on where rates are heading, not on trying to time the market perfectly.

A split loan structure, where part of your loan is fixed and part remains variable, gives you some stability while retaining flexibility to make extra repayments on the variable portion. Many buyers use a 50/50 split or a 70/30 split favouring the variable side if they plan to pay down the loan faster. If you're coming off a fixed rate and considering your options, comparing the cost of refixing versus moving fully variable will depend on current rate offerings and your circumstances.

How Offset Accounts Work When Rates Move

An offset account reduces the interest charged on your home loan by offsetting your loan balance with the funds in that account. When rates are higher, the value of an offset increases because the interest you're avoiding is calculated on a higher rate.

If you have $30,000 sitting in an offset linked to a $600,000 loan at a variable rate of 6.2%, you're avoiding interest on that $30,000 at 6.2%, which saves you roughly $1,860 per year. If the rate drops to 5.5%, the same $30,000 saves you about $1,650 per year. The offset still works, but the benefit shrinks as rates fall. Offset accounts are typically available only on variable rate loans or the variable portion of a split loan, and they usually come with a slightly higher interest rate or annual fee compared to a basic variable product.

What Rate Cuts Mean for Refinancing Activity

When rates fall, refinancing activity increases as borrowers move to lock in lower repayments or switch to a lender offering improved features. That can create processing delays, longer approval times, and increased competition for broker and lender capacity.

Buyers looking to refinance during a rate-cutting cycle should expect turnaround times to stretch. A refinance that might settle in three to four weeks during a quiet period can take six weeks or more when lender volumes spike. If you're refinancing to improve your rate before purchasing a second property or accessing equity for a deposit, factor in extra time and start the process earlier than you think you need to.

The Trade-Off Between Waiting and Buying Now

Waiting for rates to drop might improve your borrowing capacity, but it also risks higher purchase prices and reduced stock availability. Buying now locks in today's price but commits you to current rates until you refinance or they fall.

The calculation depends on your specific numbers. If a rate drop of 0.5% increases your borrowing capacity by $35,000 but median prices in Secret Harbour rise by $50,000 in the same period, you've lost ground. If prices stay flat and rates fall, waiting pays off. The challenge is that you can't know which scenario will play out, and in a supply-constrained market like Secret Harbour, betting on price stability while rates fall is optimistic.

Buyers who are ready now, with deposit and pre-approval in place, have the advantage of certainty. You can negotiate without competing against a flood of buyers whose capacity has just improved, and you can refinance to a lower rate later if the market moves in your favour. Waiting makes sense only if your current borrowing capacity genuinely prevents you from buying what you need, and even then, building a larger deposit might deliver a better outcome than hoping for a rate cut.

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