When does it actually make sense to refinance? A practical framework

Refinancing gets a lot of attention — and rightly so. For many borrowers, switching lenders is one of the most effective ways to reduce the cost of their mortgage. But it's not always the right move, and the timing and numbers matter a lot more than most people realise.

The basic case for refinancing

At its core, refinancing makes sense when the ongoing savings from a lower rate outweigh the costs of switching. Simple in theory — but the calculation requires a few layers.

The rough rule of thumb: if you can save 0.5% or more on your rate and your loan has a meaningful remaining balance and term, refinancing is usually worth investigating. But that's just the starting point.

The true cost of switching

Before you move, you need to know what it'll cost you. The typical costs of refinancing include:

• Discharge fees from your existing lender (usually $150–$400)
• Break costs if you're on a fixed rate (can be significant — see below)
• New loan application/establishment fees at the new lender
• Valuation fees (some lenders waive these)
• Lenders Mortgage Insurance (LMI) if your LVR has gone above 80% — this is rare but can occur if property values have fallen
• Government registration fees for changing mortgage holder

In most cases, total switching costs range from $500 to $2,000 for variable rate loans. The question is how quickly your monthly savings offset that outlay.

The break-even calculation

Here's a simple framework:

Monthly saving = (Current rate − New rate) × Loan balance ÷ 12

Break-even point (months) = Total switching costs ÷ Monthly saving

Example: You owe $600,000. You can reduce your rate by 0.6%. That's $3,600/year in savings — or $300/month. If switching costs you $1,500, you break even in 5 months. Any year after that, you're ahead by $3,600.

If your break-even is under 12 months, refinancing is almost certainly worth it. If it's 2–3 years or more, it requires more careful thought — especially if there's any chance you'll sell or refinance again before that point.

When fixed-rate break costs change the picture

If you're currently on a fixed rate, breaking out of it can cost thousands — sometimes tens of thousands — of dollars. Break costs are calculated based on the difference between your fixed rate and current wholesale rates, multiplied by your loan balance and the remaining term. When rates have moved significantly, these costs can be substantial.

As a general rule: if you're within the last 6–12 months of a fixed term, it may be worth waiting it out. If you're 2+ years in and rates have changed dramatically, the maths might still work in your favour — but you need to run the actual numbers.

Beyond the rate: other reasons to refinance

Rate is the most common reason, but not the only one. Refinancing can also make sense if you want to:

• Access equity to fund a renovation, purchase an investment property, or consolidate other debts
• Change loan features — for example, adding an offset account, switching to interest-only, or removing a guarantor
• Change the loan structure — such as splitting your loan or moving to a P&I arrangement
• Consolidate debt — rolling high-interest personal or car debt into your mortgage at a lower rate (though this requires careful thought around repayment term and total interest)
• Get a better service experience — sometimes borrowers simply want a lender who communicates better or has a more functional app or offset structure

When refinancing doesn't make sense

There are situations where staying put is the smarter call:

• You're deep in a fixed-rate term with significant break costs
• You're planning to sell in the next 12–18 months
• Your financial situation has changed (income drop, new credit issues) and you're unlikely to be approved on competitive terms
• Your LVR has crept above 80% due to falling property values — switching may trigger LMI you don't currently pay
• The rate savings are marginal and your loan balance is relatively small

The loyalty tax — and how to fight it

Australian lenders routinely offer better rates to new customers than they do to existing ones. If you haven't reviewed your loan in 2+ years, there's a reasonable chance you're paying more than you need to.

Sometimes the best outcome isn't switching — it's calling your existing lender and asking them to match what's available in the market. Many will. But you need to know the market rate to have that conversation effectively, and that's where a broker adds value: we know what's genuinely available right now and can negotiate on your behalf.

A practical starting point

If you haven't reviewed your home loan in 12+ months, it's worth getting a comparison done. The numbers might not support switching — but you won't know until you look. A 30-minute conversation will tell you whether the opportunity is there and whether it's worth pursuing.