How to Calculate Home Equity for Refinancing

Your home equity is the portion of your property you own outright.

Subtract what you owe from what your property is worth, and you have a figure that determines whether you can refinance, access cash, or fund your next investment. But what lenders will actually allow you to use is different from what you own on paper, and that difference matters when you're applying to restructure debt or move to a lower rate.

The Basic Equity Calculation

Home equity is your property's current value minus your outstanding loan balance. If your property is valued at $1,400,000 and you owe $800,000, you have $600,000 in equity. That calculation is straightforward. What gets overlooked is that lenders won't let you access all of it. Most cap lending at 80% of your property's value, meaning you need to keep at least 20% untouched as a buffer. In the same example, 80% of $1,400,000 is $1,120,000. Subtract your $800,000 debt, and your usable equity sits at $320,000, not $600,000. That $280,000 gap is the portion you own but can't borrow against without paying lenders mortgage insurance.

What Lenders Count as Your Property's Value

Lenders rely on their own valuation, not what you paid or what a real estate agent estimates. When you apply to refinance, the lender orders a valuation from a panel they select. In areas like Malvern, Armadale, and Toorak, where properties vary widely in condition and land size, two valuations on the same street can differ by $200,000 or more. A property with period features and original floorplan might be valued conservatively, while a recent renovation lifts the assessed figure. The valuation determines your loan-to-value ratio, which in turn controls how much equity you can access and whether you'll pay lenders mortgage insurance. If the valuer comes in lower than you expect, your usable equity shrinks accordingly.

How Equity Affects Your Refinance Application

Your equity position controls whether a lender will approve your refinance application and at what rate. Borrowers with more than 20% equity typically access lower rates and avoid lenders mortgage insurance. If you're sitting at 75% loan-to-value ratio, you have options. If you're closer to 90%, fewer lenders will compete for your business, and the rates on offer will reflect that risk. Consider a borrower in Malvern East with a property valued at $1,200,000 and an outstanding balance of $1,050,000. That's 87.5% loan-to-value ratio. They can still refinance, but they'll pay lenders mortgage insurance and face a smaller panel of willing lenders. Drop that balance to $960,000 through repayments or a slight valuation increase, and the loan-to-value ratio falls to 80%. The difference opens access to more competitive pricing and removes the insurance cost.

Releasing Equity to Fund an Investment Property

When you want to access equity to buy an investment property, lenders treat the transaction differently than a standard rate-and-term refinance. You're increasing your total debt, so serviceability becomes the main hurdle. The lender assesses whether your income can support both the existing loan and the additional borrowing. In inner-southeast Melbourne, where investment properties in suburbs like Carnegie or Bentleigh might require a 20% deposit plus costs, you could be pulling $200,000 or more from your existing property. That increase in debt changes your loan-to-value ratio and your repayment obligations. The lender will also assess the investment property's rental income, but they typically only count 80% of the projected rent to allow for vacancies and management costs. Your usable equity determines how much you can access, but your income determines whether the lender will approve it.

The 80% Threshold and Lenders Mortgage Insurance

Most borrowers aim to keep their loan-to-value ratio at or below 80% to avoid lenders mortgage insurance. That insurance protects the lender, not you, and the premium is calculated as a percentage of the loan amount above 80% loan-to-value ratio. On a property valued at $1,500,000, if you borrow $1,275,000, that's 85% loan-to-value ratio. The premium might sit between $15,000 and $25,000 depending on the lender and the exact ratio. That cost is usually capitalised into the loan, which increases your debt further. If you're refinancing to access equity and the withdrawal pushes you over 80%, factor the insurance premium into your decision. In some cases, waiting a few months to pay down the loan or hoping for a valuation increase is worth more than immediate access to cash.

How Property Valuations Move in Malvern and Surrounds

Property values in Malvern, Armadale, Glen Iris, and nearby suburbs have moved through cycles, but the area remains tightly held. Proximity to private schools, Glenferrie Road retail, and the Gardiners Creek Trail keeps demand consistent. Lenders update their postcode risk settings regularly, and suburbs in this pocket are generally viewed favourably. That doesn't guarantee a high valuation on your specific property, but it does mean lenders are willing to lend here at lower risk margins. When you're calculating equity for a refinance or investment purchase, the valuation is the variable you can't control. If you've renovated recently or your street has seen strong sales, mention that in your application. Valuers review recent comparable sales, and a broker can flag transactions that support a higher figure.

When to Recalculate Your Equity Position

Your equity shifts every time you make a repayment and every time your property value changes. If you've been in your home for several years and property values have risen, your equity may have grown substantially without any conscious effort. A loan health check gives you an updated picture of where you sit and whether refinancing makes sense. If your loan-to-value ratio has dropped from 85% to 75% since you last checked, you might now qualify for a lower rate or have enough usable equity to fund a deposit elsewhere. Recalculating equity is also relevant when your fixed rate period is ending. If your rate is set to revert to a higher variable rate and your equity position has improved, refinancing becomes a practical option to lock in a lower cost and restructure your loan at the same time.

Using Equity Without Refinancing Your Rate

Some lenders allow you to access equity through a top-up or separate split without refinancing your entire loan. This can make sense if your current rate is lower than what's available in the market, but you still want to release cash. The lender reassesses your property value and serviceability, then advances the additional funds against the same security. You end up with two splits under the one loan, one at your existing rate and one at the current rate for the new borrowing. Not all lenders offer this, and the process still involves a valuation and credit assessment. It's a middle option between doing nothing and moving your entire loan to a new lender.

Call one of our team or book an appointment at a time that works for you. We'll run the numbers on your current position, explain what equity you can access, and structure the refinance around what you're actually trying to achieve.

Frequently Asked Questions