Top tips to lock in a fixed rate as a first buyer

Why a fixed rate matters when you're buying your first home

A fixed interest rate locks in your repayment amount for a set period, usually between one and five years. For first home buyers in Victoria, this removes the uncertainty of rate movements while you adjust to mortgage repayments, body corporate fees, and the running costs that come with ownership.

The decision isn't whether to fix or not. It's how much to fix, and for how long. Most lenders let you split your loan between fixed and variable portions, which means you can lock in certainty on part of your debt while keeping flexibility on the rest. That flexibility matters when you want to make extra repayments or access an offset account without triggering break costs.

Consider a buyer securing a property with a 10% deposit under the First Home Guarantee. They fix 60% of the loan at a rate that keeps repayments predictable, and leave 40% on a variable rate with an offset account linked. When they receive a work bonus or tax return, the variable portion absorbs those extra payments without penalty. If rates drop, the variable portion benefits immediately. If rates rise, the fixed portion shields most of their repayment from the increase.

Fixed rate terms and what they actually protect you from

Most lenders offer fixed terms from one to five years. The longer the term, the more protection you have from rate rises, but also the longer you're committed to that rate even if the market falls.

A three-year fixed term is common among first home buyers because it covers the period when budgets are tightest and income is still growing. You're not locked in for so long that you miss out if rates fall, but you're protected through the initial years when unexpected costs are most likely to appear.

Shorter fixed terms of one or two years suit buyers who expect their income to increase soon or plan to refinance once they've built equity. Longer terms of four or five years suit buyers who value certainty above all else, or who are stretching their budget and can't afford repayment increases.

The term you choose should reflect your income stability and how much buffer you have in your budget, not the headline rate on offer. A slightly higher rate on a three-year term often makes more sense than a lower rate locked in for five years if your circumstances are likely to change.

How a split loan structure works in practice

A split loan divides your total borrowing into two or more portions, each with its own interest rate type. You might fix half your loan and leave the other half variable, or fix 70% and keep 30% variable. The split is flexible and depends on how much certainty you want versus how much flexibility you need.

The variable portion usually comes with an offset account, which is a transaction account linked to your loan. Every dollar in the offset reduces the balance on which interest is calculated. If you have a variable portion and keep your salary and savings in the offset, you reduce the interest charged each month without making extra repayments. This is particularly useful for first home buyers who are still building an emergency fund or expect irregular income.

The fixed portion doesn't allow offset accounts or unlimited extra repayments. Most lenders cap additional repayments on the fixed portion at around $10,000 to $30,000 per year. Go beyond that and you'll trigger break costs, which are calculated based on the difference between your fixed rate and the current wholesale rate the lender can access.

In our experience, buyers who split their loan 60/40 or 70/30 in favour of the fixed portion get enough stability to sleep well, and enough flexibility to avoid feeling trapped.

What happens when your fixed rate ends

When your fixed term expires, the fixed portion automatically rolls to the lender's standard variable rate unless you take action. That standard variable rate is almost always higher than the discounted variable rates offered to new customers, sometimes by 0.50% or more.

This is when you should review your loan. Most borrowers either negotiate a new fixed rate with their current lender, switch the fixed portion to a discounted variable rate, or refinance to another lender offering a lower rate or improved features.

If you've been making repayments on time and your property has increased in value, your loan-to-value ratio will have improved since you first borrowed. That often means you can access lower rates or remove LMI from a refinance. For buyers who started with a 5% or 10% deposit, this is the point where equity growth starts working in your favour.

Don't wait until the week before your fixed term ends to act. Start reviewing your options three to four months out. That gives you time to compare offers, get pre-approval if you're refinancing, and avoid rolling onto a higher rate by default.

How to choose between fixing and staying variable as a first buyer in Victoria

The decision depends on whether you value certainty or flexibility more, and how much room you have in your budget.

If your repayments are already stretching your budget and you're using most of your income each month, fixing a large portion or all of your loan makes sense. You won't have to worry about rate rises while you're adjusting to ownership costs.

If you have surplus income each month, expect bonuses or irregular payments, or want to pay down your loan faster, keeping a variable portion with an offset account gives you more control. You can park extra cash in the offset and reduce interest without losing access to those funds.

Victorian first home buyers using the $10,000 First Home Owner Grant on a new home often have less cash buffer after settlement, which makes a fixed rate appealing. Buyers purchasing established homes without the grant sometimes have more savings left over, which makes an offset account on a variable portion more valuable.

There's no universal answer, but there is a structure that fits your situation. A mortgage broker can model both scenarios with your actual figures and show you the difference in repayments, flexibility, and total interest cost over the life of the loan.

When break costs apply and how to avoid them

Break costs are charged when you pay out a fixed rate loan early, either by refinancing, selling the property, or making extra repayments beyond the annual limit. The cost is based on the difference between your fixed rate and the rate the lender can now lend that money at.

If you fixed at 5.5% and current wholesale rates are 4.0%, the lender has lost the opportunity to lend that money at the higher rate for the remainder of your fixed term. They calculate the present value of that lost income and charge you the difference.

Break costs can run into thousands of dollars, particularly if you're breaking a loan early in the fixed term or if rates have fallen significantly since you locked in. The cost is proportional to how much time is left on the fixed term and how far rates have moved.

You avoid break costs by not breaking the fixed portion. That's why a split loan structure is so useful. If you need to refinance, sell, or make large extra repayments, you can usually do so by acting on the variable portion only and leaving the fixed portion untouched. Some lenders also allow you to port a fixed rate to a new property if you're upgrading, though conditions apply.

If you're considering fixing your entire loan, make sure you're confident you won't need to refinance, sell, or make large lump sum repayments during the fixed term. If there's any chance you will, keep at least 30% to 40% of the loan on a variable rate.

Call one of our team or book an appointment at a time that works for you. We'll help you structure a loan that gives you the certainty you need without locking you into terms that don't suit your plans.

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