When to Check How Rates Shift Your Borrowing Power

Your borrowing power changes every time interest rates move.

Lenders assess what you can borrow by testing your income against a repayment calculated at the loan rate plus a 3.0 percentage point buffer. When the variable rate you're quoted rises or falls, your maximum loan amount shifts with it. For buyers in Margaret River, where median property values have climbed steadily over recent years, that shift can mean the difference between making an offer and missing out.

How Lenders Calculate What You Can Borrow

Lenders calculate your borrowing capacity by applying your income, expenses, and debts to a serviceability test. The test uses the interest rate on the loan product you're applying for, then adds a 3.0 percentage point buffer on top. If you're quoted a variable rate of 6.2 per cent, the lender assesses your ability to service the loan at 9.2 per cent. This buffer has been in place since October 2021 and applies to all new borrowers at banks, credit unions, and building societies regulated by APRA.

The buffer exists to protect both you and the lender if rates rise after settlement. It also means your borrowing capacity is directly tied to the rate environment at the time you apply. A 0.5 per cent increase in the quoted rate pushes the test rate up by the same amount, which reduces the loan amount you can service.

Interest Rate Movements and Loan Amounts

Consider a couple earning a combined $140,000 with $1,800 in monthly expenses and no other debts. At a variable rate of 6.0 per cent, tested at 9.0 per cent, they might be assessed as able to service a loan of around $620,000. If the variable rate rises to 6.5 per cent, pushing the test rate to 9.5 per cent, their maximum loan amount could drop to around $580,000. That $40,000 reduction matters when you're looking at homes near Prevelly or along the Bussell Highway, where stock in the $600,000 to $700,000 range moves quickly.

The reverse also applies. When rates fall, borrowing capacity increases. A buyer who was assessed six months ago may now qualify for a higher loan amount if rates have dropped in the interim, even if their income and expenses haven't changed.

Fixed and Variable Rates Affect Capacity Differently

Lenders apply the same 3.0 percentage point buffer whether you choose a variable rate, fixed rate, or split rate structure. However, the starting rate differs. Fixed rates are often priced differently to variable rates depending on the term and lender, which means the test rate and resulting borrowing capacity can vary depending on the loan structure you select.

If you're considering a split loan, the lender will assess serviceability using a blended rate across both portions, then apply the buffer to that blended figure. A split structure doesn't increase your borrowing capacity, but it can give you more control over repayments once you've settled.

Margaret River Property Market and Timing

Margaret River's property market draws a mix of local buyers, Perth-based downsizers, and interstate purchasers drawn to the coast and wine region. Homes within walking distance of town, or with proximity to beaches like Gnarabup and Surfers Point, tend to hold value even when broader market conditions soften. The local market has seen consistent demand over the past few years, supported by lifestyle migration and limited new stock.

For buyers working within a set budget, a small rate change can determine whether a property in central Margaret River or a bush block on the outskirts is within reach. Checking your borrowing capacity before you start attending open homes gives you a realistic price range and avoids the frustration of making an offer that can't be supported by a lender's assessment.

When to Lock in a Pre-Approval

A home loan pre-approval is valid for three to six months depending on the lender. It gives you a clear loan amount based on the rates and serviceability criteria in place at the time of approval. If you're approved during a period of lower rates, you're protected against rate rises that occur before you find a property, provided your circumstances don't change and you settle within the validity period.

Pre-approval also strengthens your position when negotiating. Sellers in Margaret River, particularly those with properties that have been on the market for a while, are more likely to engage seriously with a buyer who has finance already assessed.

If rates are rising, getting pre-approved sooner rather than later can lock in a higher borrowing capacity. If rates are falling, you may benefit from waiting, though this depends on how quickly you need to move and what stock is available.

Deposit Size and Rate Sensitivity

Your deposit size influences how sensitive your borrowing position is to rate changes. A buyer with a 20 per cent deposit avoids lenders mortgage insurance and typically has access to better rate discounts, which lowers the test rate and increases borrowing capacity. A buyer with a 10 per cent deposit will face a higher rate, a higher test rate, and a lower maximum loan amount.

For first home buyers in Margaret River using the Australian Government 5% Deposit Scheme, the property price cap in WA regional centres is $600,000. The scheme removes the need for LMI, but the serviceability test still applies using the lender's standard rate and buffer. If the rate you're quoted under the scheme is higher than a standard loan, your borrowing capacity will be lower, even though your deposit requirement is reduced.

Why Refinancing Changes the Equation

Existing borrowers are not subject to the same serviceability test as new applicants when their rate changes. If you're on a variable rate and it rises, your repayments increase, but your loan amount doesn't decrease. However, if you want to refinance to a new lender or access equity, you'll need to meet current serviceability requirements. This means a rate rise since you first borrowed could limit how much equity you can access or whether a refinance is approved at all.

For Margaret River property owners looking to renovate, invest, or consolidate debt, it's worth running a loan health check to understand how current rates affect your options before you commit to a plan.

Call one of our team or book an appointment at a time that works for you. We'll run the numbers based on current rates, talk through your deposit and income position, and give you a clear picture of what you can borrow in today's market.

Frequently Asked Questions