Simple hacks to navigate the home buying process

How lenders assess your borrowing capacity

Lenders assess your borrowing capacity using your income, expenses, existing debts, and a serviceability buffer that adds 3.0 percentage points to the loan product rate. Every loan application is tested against this buffered rate to confirm you can service repayments if rates rise. The Australian Prudential Regulation Authority requires all authorised deposit-taking institutions to apply this buffer, which has been set at 3.0 percentage points since October 2021.

Consider a buyer in Mandurah earning $85,000 with no dependents and a car loan balance of $12,000. The lender calculates serviceability by adding 3.0 percentage points to the proposed rate, reducing the amount they can borrow by approximately 20 to 25 per cent compared to serviceability at the product rate alone. If the buyer clears the car loan before applying, their assessed capacity increases by roughly $60,000 to $80,000 depending on the lender's policy. That can shift them from a two-bedroom unit to a house on a smaller block.

From 1 February 2026, authorised deposit-taking institutions are also subject to a debt-to-income lending limit. Each institution can lend up to 20 per cent of new owner-occupier loans and up to 20 per cent of new investor loans to borrowers with a total debt-to-income ratio of six times or greater. Bridging loans for owner-occupiers and loans for the purchase or construction of new dwellings are excluded. If your income is $90,000 and you are seeking to borrow $600,000, your debt-to-income ratio is 6.67, which places you in the restricted portion of the lender's portfolio. Lenders manage this at the portfolio level, not on a case-by-case basis, but it can affect approval speed or product availability during periods of high demand.

Pre-approval and how long it lasts

Home loan pre-approval confirms the amount a lender is willing to lend before you sign a purchase contract. Pre-approval is conditional and subject to property valuation, employment verification, and updated credit checks. Most lenders issue pre-approval for 90 days, though some extend to 120 days or reduce to 60 days depending on credit policy.

In Mandurah's market, where waterfront and canal properties move within weeks during peak demand, buyers with current pre-approval can make offers with confidence and negotiate on settlement terms rather than finance conditions. If your pre-approval expires before you locate a property, you will need to reapply. Lenders reassess income, liabilities, and credit history at that point. If your circumstances have changed, such as a shift from permanent to contract employment or a new personal loan, the approved amount may reduce or the application may require additional documentation.

Choosing between variable, fixed, and split rate structures

Variable rate home loans allow you to make unlimited additional repayments and redraw funds without penalty. Rate changes flow through to your repayment within one billing cycle. Fixed rate home loans lock your rate for a set term, typically one to five years, and limit additional repayments to a capped amount, usually between $10,000 and $30,000 per year depending on the lender. Break costs apply if you repay the loan in full during the fixed term, refinance, or breach the additional repayment cap.

A split rate loan divides the balance between a variable portion and a fixed portion, typically in ratios such as 50/50, 60/40, or 70/30. You gain partial rate certainty on the fixed portion while retaining flexibility on the variable portion. The variable portion usually includes an offset account, allowing you to reduce interest on that portion of the debt while the fixed portion continues to accrue interest at the locked rate.

Consider a buyer purchasing in Mandurah with a loan of $450,000. They split the loan with $300,000 fixed for three years and $150,000 on a variable rate with a linked offset. During the fixed term, they deposit their savings and salary into the offset account, reducing the interest charged on the $150,000 variable portion. At the end of the fixed term, they can restructure the loan, fix again at the prevailing rate, or move the entire balance to variable depending on their circumstances at that time.

How offset accounts reduce interest costs

An offset account is a transaction account linked to your home loan. The balance in the offset account is subtracted from the loan balance before interest is calculated each day. If your loan balance is $400,000 and your offset account holds $30,000, you pay interest on $370,000. The interest saved is equivalent to earning interest on your savings at the loan rate, without paying tax on that notional income.

Offset accounts are typically available on variable rate loans and the variable portion of split loans. Most lenders offer 100 per cent offset, meaning the full balance offsets the loan. Some lenders offer partial offset, where only a percentage of the account balance, such as 40 per cent or 60 per cent, is offset against the loan. Always confirm the offset percentage and whether the account includes transaction features such as a debit card and direct debit capability.

For buyers in Mandurah who receive irregular income, such as shift allowances, overtime, or seasonal work common in hospitality and tourism, an offset account provides a holding place for funds that maintains liquidity while reducing loan interest daily. This is different from making additional repayments into the loan itself, which may limit your ability to access those funds without a formal redraw request.

Lenders mortgage insurance and how it is calculated

Lenders mortgage insurance is a cost applied to home loans where the loan amount exceeds 80 per cent of the property value. The premium is calculated on a sliding scale based on the loan-to-value ratio and the loan amount. The higher the LVR, the higher the premium as a percentage of the loan. The premium is a one-time cost, typically capitalised into the loan balance, though it can be paid upfront.

A buyer in Mandurah purchasing a property valued at $500,000 with a 10 per cent deposit borrows $450,000, giving an LVR of 90 per cent. The LMI premium on this loan might range from $12,000 to $18,000 depending on the lender and insurer. If the buyer increases their deposit to 15 per cent, the LVR drops to 85 per cent and the premium reduces to approximately $6,000 to $9,000. At 20 per cent deposit, the LVR is 80 per cent and no LMI applies.

Under the Australian Government 5% Deposit Scheme, eligible first home buyers in Mandurah can purchase with a 5 per cent deposit and avoid LMI. Housing Australia provides a guarantee to the participating lender of up to 15 per cent of the property value, bringing the combined deposit and guarantee to 20 per cent. The scheme has no income caps, no annual place limits, and applies to properties up to $850,000 in Perth and applicable metropolitan postcodes. Buyers must confirm the applicable cap using the postcode search tool at firsthomebuyers.gov.au. Applications are made through a panel of participating lenders, not directly to Housing Australia. The scheme cannot be combined with Help to Buy.

Understanding principal and interest versus interest-only repayments

Principal and interest repayments reduce the loan balance each month. Each repayment includes an interest component calculated on the outstanding balance and a principal component that reduces the debt. Over time, the interest portion decreases and the principal portion increases, building equity in the property.

Interest-only repayments cover the interest charged each month without reducing the loan balance. The loan amount remains the same throughout the interest-only period, which is typically one to five years. At the end of that period, the loan reverts to principal and interest, and the repayment increases because the remaining term is shorter.

Interest-only structures are used by investment property buyers to maximise deductible interest and direct surplus cash flow to other purposes, such as offsetting an owner-occupied loan or funding further investment. For owner-occupiers, interest-only periods can provide temporary cash flow relief during periods of reduced income, such as parental leave, business establishment, or study, but they delay equity building and increase the total interest cost over the life of the loan.

First home buyer grants and stamp duty concessions in Western Australia

From 7 May 2026, the Western Australian First Home Owner Grant is $10,000 for eligible buyers purchasing or building a new home. The grant is not available for established homes. For eligible transactions commencing on or after 7 May 2026, the value cap is $800,000 for homes south of the 26th parallel of south latitude and $1,000,000 for homes north of the 26th parallel. Mandurah is located south of the 26th parallel, so the $800,000 cap applies. At least one applicant must be an Australian citizen or permanent resident, and each applicant must occupy the home as their principal place of residence for a continuous period of at least six months commencing within 12 months of completion.

From 7 May 2026, a single statewide threshold applies for the First Home Owner Rate of duty regardless of location. No duty is payable on homes valued up to $600,000. A concessional rate applies on homes valued between $600,001 and $800,000, at a rate of $16.15 for every $100 or part thereof above $600,000. The maximum dutiable value to access the concession is $800,000. For vacant land, no duty is payable on land valued up to $450,000, with a concessional rate on land valued between $450,001 and $550,000.

First home buyers in Mandurah purchasing an established home within the $600,000 threshold pay no stamp duty. Buyers purchasing at the suburb's median, which sits within the concessional band, pay reduced duty calculated on the portion above $600,000. This can reduce upfront costs by several thousand dollars compared to standard transfer duty rates, leaving more funds available for settlement costs, furniture, or an offset account buffer.

Portability and how it works when you move

A portable loan allows you to transfer your existing loan to a new property without discharging and reapplying. Portability is a product feature offered by some lenders, usually on variable rate loans and the variable portion of split loans. The benefit is that you retain your current rate, offset account, and loan structure without paying discharge fees or new application fees.

Portability works by discharging the mortgage over the first property and registering a new mortgage over the second property, while the loan account itself remains open. The lender reassesses your serviceability based on your current income and liabilities, and revalues the new property. If the new property is more expensive and you need to borrow additional funds, that top-up is assessed as a new loan, which may be offered at a different rate or under different terms. If the new property is less expensive and you are repaying part of the loan, the lender will process that as a partial discharge.

For buyers who anticipate moving within three to five years, such as those relocating for work between Mandurah and Perth, or upsizing as family circumstances change, portability provides continuity without the cost and delay of a full refinance.

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