Avoid these Refinancing Mistakes When Switching to Fixed

Switching from variable to fixed through refinancing can protect you from rate rises, but only if you time it correctly and choose a structure that fits your cashflow.

Many borrowers refinance to a fixed rate when they're worried about repayments climbing. That instinct makes sense, but the execution often doesn't. You might lock in a rate that's already priced for future increases, or you might choose a fixed term that doesn't match when you'll actually need flexibility. The result is either paying more than you needed to or facing break costs when your circumstances change.

This article walks through the specific mistakes that cost first home buyers money when they refinance from variable to fixed, and what to do instead.

Locking in a Rate Without Comparing What You're Leaving Behind

The rate you're moving to matters less than the gap between what you're paying now and what you'll pay after refinancing. If your current variable rate is sitting at 6.2% and the fixed rate you're considering is 6.0%, you're looking at a small saving that might not cover the costs of switching.

Consider a borrower with a $450,000 loan at a variable rate. Their lender's retention team offers them a discounted rate of 5.95% to stay, but they've already applied to fix at 6.1% with a new lender because they want certainty. The fixed rate feels safer, but over three years they'll pay roughly $6,000 more in interest compared to the retention offer. Refinancing isn't always about fixing the rate, it's about ensuring the rate you fix to is genuinely lower than what you can negotiate on your current loan.

Before you commit to a fixed rate elsewhere, call your current lender and ask what they'll offer to keep you. If they drop your variable rate below the fixed rate you're considering, you need to decide whether the certainty of fixing is worth the extra cost. Sometimes it is. Often it isn't.

Fixing Your Entire Loan When You'll Need Access to Funds

A fully fixed loan removes your ability to make extra repayments or redraw funds without penalties. If you're a first home buyer who's still building your savings buffer or planning renovations in the next few years, fixing 100% of your loan can box you in.

In our experience, borrowers who fix their entire loan balance often regret it within 18 months. They get a bonus at work, want to pay down debt, and discover they're capped at $10,000 in extra repayments per year. Or they need to access funds for an urgent repair and realize their redraw facility no longer exists on the fixed portion.

A split loan structure solves this. You might fix 60% to 70% of your loan to protect most of your repayments from rate rises, and leave the rest variable with an offset account or redraw. The variable portion gives you flexibility to make extra repayments or access funds if needed, while the fixed portion gives you budget certainty. It's not an all-or-nothing decision, even though most borrowers treat it that way.

Choosing a Fixed Term Based on the Lowest Rate Instead of Your Timeline

Lenders often advertise their lowest fixed rate for a specific term, usually one or two years. That rate looks appealing, but if you fix for two years and need to sell or refinance in year three, you'll wear the break costs when your circumstances change.

The right fixed term depends on your plans, not the advertised rate. If you're likely to upgrade your home, have another child, or change jobs in the next few years, a shorter fixed term or a split structure gives you more room to move. If you're settled and your income is stable, a longer fixed term makes sense because you're prioritizing certainty over flexibility.

A borrower who fixes for three years at 5.9% because it's cheaper than the four-year rate at 6.1% might save $900 in the first year. But if they need to sell in year four and break the loan, they could face break costs of $8,000 or more depending on how rates have moved. The lowest rate isn't always the right rate if it doesn't match your timeline.

Ignoring the Application Costs and Valuation Requirements

Refinancing isn't without cost. You'll usually pay for a property valuation, application fees, and sometimes discharge fees from your current lender. If you're refinancing to save 0.2% on your rate, the costs might outweigh the benefit unless you're holding the loan for several years.

A valuation alone can cost between $200 and $400 depending on your property type and location. Some lenders waive application fees, others don't. Your current lender might charge a discharge fee of $300 to $500. Add it up before you commit, and calculate how long it will take for your interest savings to cover those upfront costs.

If you're refinancing within two years of taking out your original loan, check whether you're still within a fixed rate period or subject to any early exit fees. These can add thousands to the cost of switching and make refinancing unviable unless the rate difference is significant.

Assuming Your Current Loan Structure Will Transfer to the New Lender

Not all loan features carry across when you refinance. Your offset account balance doesn't transfer automatically. Your redraw funds sit with your old lender until the loan is discharged, and you'll need to move that money manually. If you've been using an offset account to manage your cashflow, make sure your new fixed loan includes an offset on the variable portion if you're splitting.

Some lenders don't offer offset accounts on fixed rates at all. Others cap the offset functionality or charge a higher rate to include it. If you're relying on an offset to reduce your interest, and you fix your entire loan with a lender that doesn't offer one, you've just lost a key feature without realizing it.

Ask your broker or lender to confirm which features are included in the fixed loan you're considering. Don't assume the new loan will work the same way as your current one, because it probably won't.

Moving to a Fixed Rate Just Because Rates Might Rise

Rate speculation is not a strategy. If you fix your rate purely because you're worried about future increases, you might lock in at a point where fixed rates are already priced higher than current variable rates. The market prices fixed rates based on expectations, so by the time you're worried, the fixed rates have often already moved.

There's a difference between fixing because it suits your cashflow and fixing because you're reacting to headlines. If your budget is tight and you can't absorb a 0.5% rate rise, fixing makes sense because it removes uncertainty. If your budget has room to move and you're fixing purely as a hedge, you might be paying a premium for protection you don't need.

The decision to fix should be based on your financial position and your tolerance for repayment changes, not on what you think the Reserve Bank will do next quarter. If you're unsure, model out what your repayments would be if rates rose by 0.5% or 1%, and decide whether you can manage that. If you can't, fix. If you can, consider whether the cost of fixing is worth the certainty.

Refinancing to a fixed rate gives you certainty, but only if the structure, term, and rate actually suit your situation. The mistakes outlined above cost first home buyers thousands because they prioritize the rate itself over the loan structure and timing. If you're thinking about refinancing from variable to fixed, call one of our team or book an appointment at a time that works for you.

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