Refinancing your home loan: when it actually saves you money

Refinancing sounds like an easy win on paper: find a lower rate, switch lenders, save money every month. In practice, whether it’s actually worth it depends on a few numbers most people don’t check before they start the process. Here’s how to work out if refinancing is likely to pay off for you.

What actually drives the savings

The interest rate difference is the obvious factor, but it isn’t the only one. The real savings calculation weighs the rate difference against your remaining loan balance, how many years are left on the loan, and the switching costs involved. A rate cut that looks meaningful on a large, long-term balance can be marginal on a small balance with only a few years left, once you account for fees.

It’s also worth checking whether you can get a better deal from your existing lender before switching entirely. Lenders sometimes offer existing customers a better rate simply for asking, particularly if you mention you’re comparing other options, which can save you the switching costs altogether.

Finding the break-even point

A simple way to think about it: divide the total switching costs by the monthly saving the new rate would deliver, and that gives you roughly how many months it takes to come out ahead. If that break-even point sits well within how long you plan to keep the loan, refinancing is likely worth it. If it stretches out longer than your realistic timeframe, especially if you might sell or refinance again before then, the switch may not pay off in practice even if the rate itself looks attractive.

The costs that eat into the savings

Cost	When it applies	Typical size
Discharge fee	Ending your current loan	A modest fixed fee from your current lender
Application or valuation fee	Setting up the new loan	Varies by lender, sometimes waived as an incentive
Lenders mortgage insurance	If your equity is still under 20%	Can be significant, worth checking before committing
Break costs	Only if you’re refinancing out of a fixed rate early	Can be substantial, get a specific figure from your current lender first

Situations where refinancing usually makes sense

• Your fixed rate is ending soon and you’d otherwise revert to a much higher variable rate.
• Your property has grown in value enough that you now have over 20% equity, avoiding LMI on the new loan.
• Your income or circumstances have improved since you first borrowed, which may qualify you for a better rate tier.
• You want features your current loan doesn’t have, like an offset account, and the combined benefit outweighs the switching cost.

Situations where it’s usually not worth it yet

• Only a small amount remains on the loan, or you’re close to paying it off entirely.
• You’re still within a fixed-rate period with a significant break cost.
• The rate difference is marginal and the switching costs would take years to recover.

Refinancing for reasons other than rate

Rate isn’t the only reason people refinance. Some borrowers switch to consolidate other debts into their home loan at a lower rate than a personal loan or credit card, others refinance to release equity for a renovation or another purchase, and some simply want a lender with better service after a poor experience elsewhere. Each of these comes with its own trade-offs worth weighing separately from a pure rate comparison, since consolidating debt into a 25 or 30 year loan, for example, can cost more in total interest even if the monthly repayment feels lighter.

Getting an honest answer, not just a sales pitch

A broker working across multiple lenders can run these numbers properly and tell you honestly if refinancing isn’t worth it yet, rather than pushing a switch that mostly benefits their own commission. If you’re weighing this up, it’s worth asking a mortgage broker to model your actual numbers rather than relying on a rough rule of thumb, since the break-even point depends heavily on your specific loan balance and remaining term. Our methodology explains how we assess brokers on this kind of honest, numbers-first advice, and our home page is a good place to start comparing.