Simple hacks to choose your first home loan structure

What's the actual difference between a fixed and variable rate?

A fixed rate locks in your interest rate for a set period, usually one to five years, so your repayments stay the same regardless of what happens in the market. A variable rate moves up or down with the lender's standard rate, which means your repayments can change.

The appeal of a fixed rate is certainty. You know exactly what you'll pay each month, which makes budgeting easier when you're adjusting to mortgage repayments for the first time. Variable rates give you flexibility. Most variable loans come with features like an offset account or the ability to make extra repayments without penalty, which can reduce the interest you pay over time.

Consider a first home buyer in Semaphore who locked in a fixed rate when they signed their contract in early 2025. Rates climbed by nearly half a percent within six months. Their fixed rate stayed put, which gave them breathing room while they adjusted to the costs of owning a home near the beach. The downside? They couldn't make extra repayments without triggering break fees, and they didn't have access to an offset account during the fixed period.

Can you use both at the same time?

Yes. A split loan divides your borrowing between a fixed portion and a variable portion. You might fix 60% of your loan and leave 40% variable, or any other combination that suits your goals.

Splitting gives you a middle ground. You get some certainty from the fixed portion and some flexibility from the variable portion. If rates rise, part of your loan is protected. If rates fall, part of your loan benefits. You can also make extra repayments or use an offset account on the variable portion without penalty.

In practice, a split works well for buyers who want predictable repayments but don't want to lock everything away. A buyer purchasing a character cottage near Semaphore Road might fix enough to cover their essential living expenses, then leave the rest variable so they can throw extra cash at the loan when work picks up or they receive a bonus.

Fixed rates and what you give up

Most fixed rate loans don't allow unlimited extra repayments. Lenders typically cap additional payments at $10,000 to $30,000 per year during the fixed period. If you exceed that limit, you may be charged a break fee.

You also can't link an offset account to a fixed loan in most cases. An offset account sits alongside your loan and reduces the interest you're charged based on the balance in that account. It's one of the more useful features for buyers who keep savings or regular income flowing through their accounts, but it's usually only available on variable loans.

If you're planning to pay off your loan faster or you expect irregular income, fixing your entire loan can limit your options. That's where splitting becomes more practical.

Variable rates and the offset account advantage

Variable loans give you access to features that can reduce your interest over time. The most common is an offset account. Every dollar in your offset account reduces the balance on which interest is calculated, so if you have $20,000 sitting in your offset and a $400,000 loan, you're only charged interest on $380,000.

This is particularly useful for first home buyers who are still building their financial buffer after settlement. Instead of locking savings away or making irreversible extra repayments, you can park funds in your offset and reduce interest while keeping full access to the money.

Redraw is another variable loan feature, but it works differently. If you make extra repayments, you can usually redraw those funds later, but some lenders charge a fee or limit how often you can access the money. Offset accounts are more flexible because the money stays in your own transaction account.

How Semaphore buyers can use the 5% Deposit Scheme with different loan structures

The Australian Government 5% Deposit Scheme lets eligible first home buyers purchase with a 5% deposit without paying lenders mortgage insurance. Semaphore falls under the capital city and regional centres price cap for South Australia, which is $900,000.

You can use the scheme with a fixed, variable, or split loan structure, depending on what your participating lender offers. Not all lenders on the panel offer every loan type, so it's worth confirming your options early in the process.

Some buyers assume they need to choose a variable loan to access flexibility, but a split structure can give you the same outcome. You might fix 50% of your borrowing under the scheme and leave the other 50% variable with an offset account attached. That way, you're not paying LMI, you've got rate protection on half your loan, and you've still got access to the features that help you pay down debt faster.

What happens when your fixed rate ends?

When your fixed term finishes, your loan automatically reverts to the lender's standard variable rate unless you choose to refix or refinance. The standard variable rate is usually higher than discounted variable rates offered to new customers, so your repayments can jump.

Most lenders will contact you a few months before your fixed term expires and offer you the option to lock in a new fixed rate. You can also switch to a variable loan or negotiate a lower rate with your current lender. If the rate your lender offers isn't competitive, refinancing to another lender might save you more in the long term.

Timing matters. If you wait until after your fixed term expires, you lose negotiating room. If you start the conversation three to six months out, you've got time to compare options and lock in a rate that works for your budget.

Interest rate movements and how they affect your repayments

Interest rates set by the Reserve Bank influence what lenders charge on variable home loans. When the cash rate rises, variable rates usually follow within a few weeks. When the cash rate falls, variable rates may drop, though not always by the same amount.

Fixed rates are priced differently. They're based on wholesale funding costs and expectations about future rate movements, which is why fixed rates can rise even when the cash rate is steady, or fall when variable rates are climbing.

For first home buyers in Semaphore, this means your choice depends partly on what you think rates will do, but more importantly on what structure gives you the financial control you need right now. If your income is steady and you value certainty, fixing makes sense. If you want the ability to pay your loan down faster or your income varies, variable or split structures give you more control.

Splitting your loan and how to structure the balance

There's no single formula for how to split a loan. Some buyers fix 70% and leave 30% variable. Others go fifty-fifty. The decision depends on how much certainty you want and how much flexibility you need.

A higher fixed portion gives you more rate protection but limits how much extra you can pay off. A higher variable portion means more of your loan is exposed to rate movements, but you can pay it down faster and use offset features on a larger balance.

If you're using a government scheme like the 5% Deposit Scheme and you're borrowing close to the property price cap, splitting lets you lock in certainty on the bulk of the loan while keeping a smaller variable portion for extra repayments as your income grows. You're not locked into one approach forever. When your fixed term ends, you can refix a different portion or switch entirely to variable depending on your circumstances at the time.

Comparing loan features before you apply

Not all fixed or variable loans are structured the same way. One lender might let you make $30,000 in extra repayments during a fixed term. Another might cap it at $10,000. One variable loan might come with a full offset account. Another might only offer partial offset or redraw.

Before you apply, check what features are included and whether they suit how you manage money. If you're self-employed or work in a seasonal industry, having access to redraw or offset can make a big difference during quieter months. If you're on a salary and your income is stable, a fixed loan without those features might be fine.

Your home loan application will also depend on your deposit size, income, and whether you're using a government scheme. A broker can help you compare loan features across multiple lenders and find a structure that matches your goals, rather than just the lowest advertised rate.

Call one of our team or book an appointment at a time that works for you. We'll walk through your options and help you choose a loan structure that actually fits how you want to manage your money.

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