Families outgrow their homes faster than they expect. A second child, a home office, or the need for a separate living area changes the equation overnight.
The difference between affording the upgrade and walking away from it usually comes down to how the home loan is structured, not just how much equity you hold.
How much borrowing capacity do you gain when upgrading
Borrowing capacity depends on net income after tax, existing debts, and the serviceability buffer applied by the lender. Banks assess your ability to service the loan at a rate 3.0 percentage points above the product rate, meaning a variable rate loan at 6.2 per cent will be assessed at 9.2 per cent.
Consider a household earning $140,000 combined with no other debts and a current loan balance of $420,000 on a property now valued at $630,000. That household holds $210,000 in equity. At an 80 per cent loan-to-value ratio, total borrowing is capped at $504,000, allowing access to $84,000 in usable equity before lenders mortgage insurance applies. If the household is purchasing at $720,000, the shortfall between available equity and the required deposit will need to be funded either by accepting a higher LVR and paying LMI, or by holding a larger deposit through savings.
In practice, most upgrading families in Truganina with two incomes and school-age children find themselves serviceability-constrained rather than equity-constrained. The combined effect of childcare costs, school fees, and increased living expenses reduces the surplus available for loan servicing, even where equity is sufficient.
Does a split loan structure reduce repayment pressure during the transition
A split loan allows you to fix a portion of your borrowing while leaving the remainder on a variable rate. Fixing 50 to 70 per cent of the loan provides certainty over the majority of your repayments while retaining access to offset and redraw facilities on the variable portion.
The scenario that highlights the value of this structure is the family holding two properties during settlement. You exchange contracts on the new home before selling the existing property, creating a bridging period where both loans are active. During this period, any surplus income or sale proceeds can be directed into the offset account linked to the variable portion, reducing the interest burden without penalty. The fixed portion remains unaffected, keeping the majority of your repayments predictable.
Split structures also allow flexibility at refinance. If one lender offers a lower fixed rate but another offers better offset terms on the variable component, you are not locked into a single institution for the entire loan amount. Each portion can be refinanced independently.
What happens to borrowing capacity if you keep the existing property
Retaining the existing property as an investment loan converts it from an owner-occupied liability to an income-producing asset. Rental income increases your serviceability, though lenders typically apply a shading factor of 20 per cent to account for vacancy and maintenance.
Truganina has attracted strong tenant demand in recent years, particularly from families seeking proximity to Westbourne Grammar, Truganina P-9 College, and the Riverside estate precinct. Three-bedroom homes in the suburb typically achieve rental returns between $450 and $550 per week depending on condition and location within the suburb. After shading, a rental income of $500 per week contributes approximately $20,800 per year to serviceability.
The trade-off is that the existing loan balance remains in full and is assessed at the higher investment loan serviceability rate. A household with $420,000 outstanding on the retained property and applying for a new $600,000 owner-occupied loan is servicing a combined debt position of $1,020,000. That requires a higher income threshold than servicing the new loan alone.
Tax deductions on the investment loan interest improve the net position but do not alter the upfront serviceability assessment. Borrowers considering this structure should model the cash flow position with rental income shaded and both loan repayments active before committing to the purchase.
How does pre-approval timing affect your ability to secure the property
Pre-approval provides conditional loan approval before you make an offer. It confirms your borrowing capacity, flags any documentation gaps, and reduces the finance clause period required in the contract.
In Truganina, where properties near Williams Landing Station and the Westside precinct can attract multiple offers within the first week of listing, a pre-approval allows you to move quickly without overcommitting. Sellers are more willing to negotiate on settlement terms or minor conditions when the buyer has finance already assessed.
Pre-approval is valid for 90 days in most cases, though some lenders issue conditional approval for 120 days. Rates are not locked at pre-approval unless you separately elect to lock during the application. If rates increase between pre-approval and formal approval, the higher rate applies. If rates fall, most lenders will pass on the reduction.
The other advantage is clarity around LMI. Pre-approval confirms whether your deposit and borrowing amount will trigger LMI and provides the premium estimate upfront. That cost can then be included in your settlement budget or capitalised into the loan if required.
Should you use equity or save a larger deposit
Using equity from your existing property allows you to upgrade without waiting years to accumulate additional savings. Equity can be accessed by refinancing the existing loan or by cross-securing both properties under a single lending structure.
The alternative is to hold the existing property, continue paying down the loan, and accumulate savings toward a cash deposit on the new property. This approach avoids increasing your overall debt position but delays the upgrade.
For a family in Truganina where the existing property is a three-bedroom home purchased several years ago and now valued higher due to infrastructure improvements along Forsyth Road and the expansion of the Westside Village shopping precinct, equity may have increased significantly without additional principal repayments. Accessing that equity allows the upgrade to occur while the children are still at an age where the additional space has the most value.
The risk is borrowing at a higher LVR and paying LMI if usable equity is insufficient to reach an 80 per cent LVR on the new property. Families upgrading from a $600,000 property to a $750,000 property with $150,000 in equity can contribute that equity as a deposit, but the new loan amount of $600,000 represents an 80 per cent LVR only if no LMI or other capitalised costs apply. In practice, small shortfalls often push the LVR marginally over 80 per cent, triggering an LMI premium that could have been avoided with an additional $10,000 to $15,000 in cash savings.
Call one of our team or book an appointment at a time that works for you. We work with families across Truganina and structure lending to match your equity position, income, and timing without overcommitting your cash flow during the transition.
Frequently Asked Questions
Can I use equity from my current home to buy a larger property without selling first?
Yes, equity can be accessed by refinancing your existing loan or through cross-securitisation. You will need sufficient borrowing capacity to service both loans during any bridging period before the sale settles.
Does a split loan reduce repayment pressure when upgrading to a larger home?
A split loan fixes a portion of your borrowing for repayment certainty while keeping the remainder variable with offset access. This structure is useful during bridging periods or when managing two properties temporarily.
How does keeping my existing property as an investment affect my borrowing capacity?
Rental income increases serviceability, though lenders shade it by around 20 per cent. The existing loan balance remains in full and is assessed at investment loan rates, requiring higher income to service both loans.
How long is pre-approval valid and does it lock in the interest rate?
Pre-approval is typically valid for 90 to 120 days depending on the lender. Rates are not locked unless you separately elect to do so during the application period.
Will I need to pay lenders mortgage insurance when upgrading to a larger home?
LMI applies if your loan-to-value ratio exceeds 80 per cent on the new property. The premium is calculated on the loan amount above 80 per cent LVR and can be paid upfront or capitalised into the loan.
