When to Use Home Equity to Buy a Second Home

Buying a second home using equity from your existing property gives you access to capital without needing to save a separate deposit from scratch.

The decision to use equity rather than cash savings usually comes down to three factors: whether you have sufficient usable equity, whether your income can service both loans, and whether the purchase timeline suits a refinance or top-up. Understanding these upfront helps you structure the loan correctly and avoid delays during the purchase process.

How Much Equity Can You Actually Use

Most lenders allow you to borrow up to 80% of your property's current value, minus what you still owe.

Consider a property valued at $800,000 with a remaining mortgage of $400,000. At 80% lending, the maximum borrowing is $640,000. Subtract the existing $400,000 loan, and you have $240,000 in usable equity. That amount can cover the deposit, stamp duty, and settlement costs on a second property without requiring cash savings.

If you need to borrow above 80%, lenders mortgage insurance applies. That adds several thousand dollars to the cost and may not be approved if your borrowing capacity is already stretched across two properties. Running the numbers early with a broker clarifies whether you have enough equity to proceed without hitting serviceability limits.

Structuring the Loan Across Two Properties

You can either refinance the existing property to release equity, or keep the current loan in place and take out a separate loan for the second home.

Refinancing works when your current interest rate is uncompetitive or when consolidating both properties under one lender simplifies repayments. The downside is that refinancing can take four to six weeks, and if your current loan has a fixed rate with break costs, the expense may outweigh any benefit.

A standalone second dwelling finance on one title loan keeps the existing mortgage untouched. This approach suits buyers who have a competitive rate, want to keep offset accounts linked to the original loan, or need faster approval for a time-sensitive purchase. Each property is assessed separately, but your total debt across both loans is considered when calculating serviceability.

Deposit and Purchase Costs for the Second Property

The deposit for an investment property is typically 20% of the purchase price, though some lenders accept 10% if you can demonstrate strong income and equity position.

Stamp duty, conveyancing, and building inspections add another layer of cost that must be funded from either usable equity or cash reserves. In New South Wales, stamp duty on a $600,000 investment property is around $24,000. In Victoria, it is approximately $31,000. Queensland charges roughly $16,000 for the same purchase price. These figures vary depending on concessions and whether the property is classified as an investment or future owner-occupied home.

If your usable equity covers the deposit but not the full cost of purchasing, lenders may allow you to capitalise some of these expenses into the loan, provided your loan-to-value ratio stays within policy limits. That keeps cash reserves intact but increases the total amount borrowed and the monthly repayment.

When Serviceability Becomes the Limiting Factor

Having enough equity does not automatically mean you can borrow the full amount needed.

Lenders assess your income against all existing debts, living expenses, and the proposed repayments on both the existing and new loans. If rental income from the second property will form part of your servicing, most lenders only accept 80% of the projected rent to account for vacancy periods and maintenance costs.

In scenarios where a buyer has $300,000 in usable equity but limited surplus income, the lender may approve a smaller loan amount or require a larger deposit to reduce monthly repayments. Pre-approval before committing to a purchase contract confirms exactly how much you can borrow and prevents issues at settlement.

Timing the Purchase Around Pre-Approval

Pre-approval typically lasts three to six months and gives you a clear borrowing limit before you start looking at properties.

Without pre-approval, you risk finding a property, making an offer, and discovering during formal application that your equity position or income does not support the loan structure you assumed was available. This is particularly relevant for buyers using equity release to build a granny flat or purchasing a second dwelling on the same title, where lender policy varies significantly.

Some lenders treat a second home on the same title as a construction project rather than a standard property purchase, which changes the assessment process and the documents required. Clarifying this during pre-approval ensures the loan structure matches the intended purchase and that funds will be available when needed.

Repayment Structure and Offset Considerations

Most buyers choose principal and interest repayments on the original home loan and consider interest-only repayments on the investment property loan.

Interest-only reduces monthly cash flow pressure and allows rental income to cover most or all of the loan cost. The principal is not reduced during the interest-only period, but the borrower retains flexibility to pay down the loan faster if cash flow improves.

If you are using an offset account linked to your existing home loan, check whether refinancing or restructuring will affect that linkage. Some lenders allow offset accounts to remain attached to the original loan even after releasing equity, while others require the offset to be reapplied or split across both loans. Losing offset functionality on a loan with a large balance can increase the effective interest paid over time.

Call one of our team or book an appointment at a time that works for you. We will walk through your equity position, clarify your borrowing capacity across both properties, and structure the loan so it aligns with your purchase timeline and repayment preferences.

Frequently Asked Questions