How to Calculate Home Equity for Refinancing

Your equity is what you own minus what you owe.

Take your property value, subtract your mortgage balance, and what's left is your usable equity. Lenders typically let you access up to 80% of your property's value without paying Lenders Mortgage Insurance, which means your equity calculation needs to account for that limit. If your home is worth $500,000 and you owe $300,000, you own $200,000 in equity, but you can only borrow against $400,000 (80% of $500,000). That puts your usable equity at $100,000 before LMI kicks in.

Why Property Valuation Drives the Number

Your equity calculation only works if your property value is current. Lenders don't accept your estimate or what you paid five years ago. They order a valuation, and that figure determines how much you can borrow. If you purchased in a suburb that's since softened, your equity might be lower than expected. If you bought before a price surge, you could be sitting on more than you realised. The difference matters when you're refinancing to access equity or consolidating debt.

Consider a mobile plant operator who bought in a regional mining town during a downturn and has been paying down the mortgage for three years. Purchase price was in the low $400,000 range, current balance is $320,000. The suburb has since lifted, and comparable sales put the property closer to $480,000. Usable equity sits around $64,000 without LMI, enough to fund a deposit on an investment property or clear a vehicle loan and a credit card. Without checking the valuation, that operator might assume equity is still modest and delay the decision.

How Lenders Handle the 80% Threshold

Most lenders cap your borrowing at 80% of your property's value to avoid LMI. Cross that line and the cost of insurance can add thousands to your loan, which eats into what you're trying to achieve. If you're refinancing to release equity, staying under 80% keeps the process cheaper and faster. If you need more than 80%, the calculation changes because you're now factoring in the insurance premium on top of the loan amount.

In our experience, FIFO workers often underestimate how much they've paid down during a solid run of work. A few years of consistent income and regular repayments can shift your equity position significantly, especially if your suburb has held value or appreciated.

Using Equity to Fund the Next Purchase

Once you know your usable equity, you can plan your next move. If you're looking to buy an investment property, that equity becomes your deposit. If you're upgrading, it covers the gap between selling and settling. If you're consolidating debt, it clears high-interest balances without needing a separate personal loan. The application process for home loan refinancing involves a formal valuation, so your estimate needs to be close to what the lender will accept.

As an example, a mobile plant operator with a property valued at $550,000 and a mortgage of $380,000 has $170,000 in equity. At 80%, the borrowing limit is $440,000. Subtract the existing mortgage and there's $60,000 available to pull out. That's enough for a deposit on a unit in a growth suburb or to fund a renovation that adds value. The key is knowing the figure before you start looking at properties or committing to a contractor.

What Happens When You Go Over 80%

If you need to borrow more than 80% of your property's value, the lender will add LMI to your loan. The premium depends on how much you're borrowing and your deposit size, but it's typically several thousand dollars. Some FIFO workers qualify for LMI waivers, which lets you borrow up to 90% or higher without the insurance cost. That changes your equity calculation because you're no longer capped at 80%.

Without the waiver, going to 85% might make sense if the extra borrowing capacity covers what you need and the LMI cost is manageable. Going to 90% or 95% starts to push your repayments higher and your equity buffer lower, which can limit your options if property values dip.

How Loan Purpose Affects What You Can Access

Lenders assess equity release differently depending on what you're using it for. If you're buying another property, they'll want to see the contract and confirm the deposit amount. If you're consolidating debt, they'll ask for balances and statements. If you're renovating, they might want quotes or a scope of work. The equity figure stays the same, but how much you can access depends on whether the lender sees the purpose as lowering risk or increasing it.

Debt consolidation is common for FIFO workers who've accumulated vehicle finance, credit cards, and personal loans during roster changes or between contracts. Rolling those into your mortgage can drop your monthly outgoings, but it only works if your equity supports the higher loan amount and the lender approves the purpose.

Calculating Equity When You're Coming Off a Fixed Rate

If your fixed rate period is ending, refinancing gives you a chance to reassess your equity and your loan structure. Your property may have increased in value since you locked in the rate, and your mortgage balance has likely dropped. That combination can open up options that weren't available when you first fixed. Running the equity calculation now, before your rate reverts, lets you compare refinancing offers with your current lender's variable rate.

We regularly see operators who fixed at the start of a construction boom and are now sitting on properties worth 10% to 15% more than their original valuation. That's equity you can use, but only if you refinance before your rate rolls over and your repayments jump.

When to Request a Valuation Before Applying

If you're uncertain about your property's current value, ordering a valuation before you apply can save time. Some brokers offer access to automated valuation models that give you a range based on recent sales. Others can arrange a formal valuation upfront if your equity position is unclear. Knowing the number before you lodge the application means you won't be surprised halfway through the process when the lender's valuation comes back lower than expected.

For mobile plant operators working long rosters, waiting weeks for a valuation during the application can delay settlement or cost you the opportunity. Getting it done early keeps the timeline under control and lets you move when you're ready.

Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions