When to Refinance for a Lower Interest Rate

Switching your mortgage to a lower rate can cut your monthly repayments and reduce what you pay in interest over the life of your loan.

The question is not whether a lower rate exists, it usually does. The real decision is whether refinancing now makes financial sense once you account for the costs involved, your current loan structure, and what you're trying to achieve. A rate that looks attractive on paper may not deliver the savings you expect if you're not comparing like-for-like features or if you're close to paying off your loan.

When the Rate Difference Justifies the Switch

A rate reduction of 0.30% or more typically makes refinancing worth exploring. Anything smaller than that may not cover the costs of switching, which usually include application fees, valuation fees, and potential discharge fees from your current lender. Consider someone with $450,000 remaining on their loan over 25 years. Dropping from 6.20% to 5.80% would save them around $600 per year in interest. If the refinance costs $1,200 in total, they break even after two years and save from that point forward.

Your loan size and remaining term influence whether the numbers stack up. A larger loan balance or longer time until you pay off the loan means more opportunity to recoup switching costs. If you're within five years of paying off your mortgage, the total interest saved may not justify the effort and expense.

Coming Off a Fixed Rate Period

You have the strongest position to refinance when your fixed rate period ends. Most lenders revert you to their standard variable rate, which is often higher than the rates they offer to new customers. If your fixed rate is about to expire, you're not locked in and you won't face break costs for leaving.

Lenders compete hardest for new business, so refinancing at this point often means you can access a lower rate without penalty. In our experience, borrowers who stay with their lender after a fixed term ends can pay 0.50% to 1.00% more than they would by switching. That difference compounds quickly on a loan of any size.

What Refinancing Costs to Account For

Application fees for a new loan typically range from $0 to $600, depending on the lender. A property valuation may cost between $200 and $400, though some lenders waive this or cover it as part of a refinance package. Your current lender may charge a discharge fee of $150 to $400 to release the mortgage. If you're still within a fixed rate period, break costs can run into thousands of dollars, and those usually wipe out any rate saving unless you're moving for reasons beyond the rate itself.

Settlement costs, including legal fees and government charges, add another $500 to $1,000. Some lenders offer cashback incentives to new customers, which can offset these costs, but you need to read the terms. Cashback offers often require you to stay with the lender for a minimum period or they claw the payment back.

Loan Features That Affect Your Decision

A lower rate matters, but the structure of your new loan determines whether you actually come out ahead. If your current loan includes an offset account that reduces the interest you pay on your full balance, switching to a loan without one could cost you more, even at a lower headline rate. The same applies if you lose redraw access or flexible repayment options that let you pay ahead without penalty.

Consider a borrower with $380,000 owing and $50,000 sitting in an offset account. They're only paying interest on $330,000. If they refinance to a rate 0.40% lower but lose the offset, they start paying interest on the full $380,000. The rate drop does not cover that difference. Before you move, compare what you're actually paying in interest now against what you'd pay under the new loan, including how you use the features you have.

Refinancing to Consolidate or Access Equity

Some borrowers refinance to roll other debts into their mortgage or to access equity for investment purposes. If you're doing this at the same time as chasing a lower rate, the savings on your mortgage interest may be partly offset by what you're now paying interest on at mortgage rates rather than higher personal loan or credit card rates. That can still be a win, but it changes the calculation.

As an example, someone consolidating $30,000 in credit card debt at 20% into their mortgage at 6.00% will save around $4,200 per year in interest on that portion alone. If they also drop their mortgage rate by 0.50%, the combined saving can be significant. The trade-off is that you're now paying off that $30,000 over the life of your mortgage unless you make extra repayments, which increases the total interest paid on that amount over time.

Switching Between Fixed and Variable Rates

If rates are falling or expected to fall, moving from fixed to variable lets you benefit immediately. If rates are rising or uncertain, locking in a fixed rate protects your repayments for the fixed period. The decision depends on where rates are heading and your tolerance for repayment changes. A variable rate gives you flexibility to make extra repayments and pay your loan off sooner without penalty. A fixed rate gives you certainty but usually restricts how much you can repay above the minimum each year.

Refinancing to switch rate types only makes sense if your circumstances or the rate environment have changed since you first locked in. If you fixed at 2.50% and variable rates are now sitting well above that, breaking your fixed loan early to switch will cost you more than you save. If your fixed period is ending and variable rates are lower than your revert rate, switching becomes straightforward.

Running a Loan Health Check Before You Commit

Before you apply to refinance, compare your current loan against what's available. A loan health check looks at your rate, fees, features, and how your loan fits your current situation. It also identifies whether you're paying for features you don't use or missing features that would save you money.

Lenders assess your borrowing capacity based on your current income, expenses, and credit history. If your financial position has changed since you first borrowed, that may limit your options or affect the rate you're offered. Knowing where you stand before you apply avoids wasted time and protects your credit file from unnecessary enquiries.

Call one of our team or book an appointment at a time that works for you. We'll compare your current loan against the market, calculate whether refinancing delivers a genuine saving, and walk you through the process if it makes sense for your situation.

Frequently Asked Questions