Simple hacks to choose fixed, variable or split loans

A first home buyer applying for a loan faces three structural choices: fix the rate entirely, leave it variable, or split the loan between the two.

The choice matters because each structure responds differently when the Reserve Bank moves rates. With the cash rate at 4.35% and major banks forecasting at least one more increase before year-end, the structure you choose now shapes your repayments through what is likely to be a volatile rate cycle. The decision should be anchored to your actual cash flow capacity and your ability to absorb rate movements, not to predictions about where rates might land in two years.

How a Fixed Rate Protects Against Rate Rises

A fixed rate locks your interest rate for a set period, typically one to five years. During that time, your repayments remain unchanged regardless of Reserve Bank decisions.

Consider a buyer purchasing a unit in Newstead at the current median who borrows with a fixed rate. If the Reserve Bank raises the cash rate by 25 basis points in September and again in November, a variable rate borrower would see their repayments increase twice. The fixed rate borrower's repayments do not move. The value of that protection depends entirely on the size of your financial buffer. A buyer with three months of repayments in reserve values rate certainty differently to a buyer with twelve months of reserve sitting in an offset account.

Fixed rates typically price in the market's expectation of future rate movements. If lenders expect rates to rise, fixed rates will often sit above current variable rates. The margin between the two reflects what the market believes is coming. Locking in a fixed rate at a premium only makes sense if you expect actual rate rises to exceed what is already priced in, or if the certainty itself is worth paying for.

Variable Rates and Offset Flexibility

A variable rate moves in line with your lender's pricing decisions, which generally follow Reserve Bank movements but are not bound by them.

The primary advantage of a variable rate is access to an offset account. An offset account is a transaction account linked to your loan. The balance in the offset reduces the interest charged on your loan without locking your funds away. For a first home buyer who receives irregular income, carries a variable expense base, or plans to make lump sum repayments from bonuses or sale proceeds, the offset provides liquidity that a fixed loan does not.

In our experience, buyers in Newstead often enter the market with a deposit close to the minimum required under the Australian Government 5% Deposit Scheme. Once settlement occurs, rebuilding cash reserves becomes the next priority. A variable loan with an offset allows you to park those reserves in an account where they reduce your interest bill immediately, while remaining accessible if an urgent cost arises. A fixed loan typically offers redraw rather than offset. Redraw allows you to withdraw extra repayments you have made, but the funds are not reducing your interest in real time the way an offset balance does, and access can be subject to lender approval and processing delays.

Split Loans Allocate Risk Across Two Rate Structures

A split loan divides your borrowing between a fixed portion and a variable portion. Each portion operates independently with its own rate, terms, and features.

The most common split is 50/50, but the allocation can be adjusted to suit your circumstances. A buyer purchasing in Windsor at the suburb's current median might fix 70% of the loan to protect the bulk of their repayments, and leave 30% variable to retain access to an offset for their cash buffer. The fixed portion shields them from the majority of any rate rise impact. The variable portion provides flexibility to make extra repayments or use offset funds without restriction.

Splits are not a hedge in the financial sense. They do not eliminate rate risk. They distribute it. The fixed portion provides a floor on how high your minimum repayment can go during the fixed term. The variable portion retains flexibility but moves with rate changes. The structure works when you have a clear view of which portion of your borrowing needs protection and which portion benefits from liquidity.

The cost of a split is administrative rather than financial. You will have two loan accounts, two sets of statements, and potentially two sets of fees. Some lenders charge higher ongoing fees on split structures. The benefit must outweigh that complexity.

Selecting the Right Structure Based on Borrowing Capacity

Your borrowing capacity is calculated using a serviceability buffer, typically 3%. Lenders assess whether you can service the loan at a rate approximately 3% above the rate you will actually pay.

A buyer borrowing at current variable rates is assessed at a rate above 7%. If the Reserve Bank raises rates twice more and your variable rate increases by 50 basis points, your actual rate remains well below the rate at which you were assessed. You are servicing the loan within the buffer the lender already tested. A buyer who borrowed at maximum capacity has less room to absorb increases, but the buffer provides some insulation.

A fixed rate assessed at the same serviceability buffer provides certainty within that tested range. If you fix at 6.5% for three years, your repayments will not exceed the level you were assessed at unless you refinance or the fixed term ends. For buyers who have borrowed close to their maximum and have limited surplus income, fixing provides time to build equity and increase income without repayment pressure.

The structure you select should match the margin between your assessed capacity and your actual repayment commitment. A buyer with significant surplus capacity can afford to take variable rate risk and benefit from offset flexibility. A buyer at maximum capacity benefits more from fixed rate certainty during the period when their cash flow is tightest.

Fixed Rate Break Costs and Early Exit Penalties

A fixed rate loan charges a break cost if you repay the loan or refinance before the fixed term ends. The break cost compensates the lender for the difference between the rate you are paying and the rate the lender can now earn by re-lending that money.

Break costs are calculated using a present value formula based on the remaining term, the amount being repaid, and the movement in wholesale interest rates since you fixed. If rates have risen since you locked in your fixed rate, the break cost is usually nil because the lender can re-lend at a higher rate. If rates have fallen, the break cost can be substantial.

A buyer who fixes for three years and needs to sell after 18 months due to a job relocation will incur a break cost if rates have dropped during that period. The cost can run into thousands of dollars and is deducted from your loan payout. Variable rate loans and the variable portion of split loans do not carry break costs. You can repay or refinance at any time without penalty beyond standard discharge fees.

If there is any chance you will sell, relocate, or refinance within the fixed term, the risk of a break cost should factor into your decision. Fixing provides certainty, but it removes optionality.

How Interest Rate Discounts Vary by Loan Structure

Lenders offer different interest rate discounts depending on the loan structure, the loan size, and the loan-to-value ratio.

Variable rates generally carry larger discounts than fixed rates when you borrow above a certain threshold or maintain a loan-to-value ratio below 80%. A buyer borrowing with a 10% deposit will receive a smaller discount than a buyer borrowing with a 20% deposit, and that difference can be 20 to 30 basis points depending on the lender. Some lenders also offer tiered discounts where the rate reduces once your loan balance exceeds $500,000 or $750,000.

Fixed rates are less responsive to discounting. The fixed rate is set by the lender's cost of funds in the wholesale market, and there is less room to negotiate. A broker can identify which lenders are pricing fixed rates competitively at any given time, but the margin for discount is narrower than on a variable loan.

Split loans can be structured to take advantage of discounting on the variable portion while locking in certainty on the fixed portion. The weighted average rate across the two portions becomes your effective rate. A split where 50% is fixed at 6.4% and 50% is variable at 6.1% produces an effective rate of 6.25%. The structure allows you to access a lower average rate than a fully fixed loan while retaining more protection than a fully variable loan.

Loan Features That Differ Between Fixed and Variable Products

Fixed and variable loans provide different access to features that affect how you manage the loan over time.

Variable loans typically allow unlimited extra repayments without penalty. You can pay $500 extra one month, $2,000 the next, and nothing the month after, depending on your cash flow. Fixed loans either prohibit extra repayments entirely or cap them at a yearly limit, often $10,000 or $30,000 depending on the lender. Exceeding that cap triggers a penalty calculated similarly to a break cost.

Variable loans provide access to offset accounts as standard. Fixed loans generally do not. Some lenders offer a partial offset on fixed loans, but it is uncommon and typically only offsets 40% to 60% of the balance rather than 100%.

Redraw is available on most variable loans and some fixed loans, but the terms differ. On a variable loan, redraw is usually free and accessible online. On a fixed loan, redraw may incur a fee, require lender approval, and take several days to process. The distinction matters if you plan to use redraw as a liquidity management tool rather than a long-term savings vehicle.

Portability allows you to transfer your loan to a new property without breaking the existing loan contract. Variable loans are generally portable. Fixed loans can be portable, but moving the loan to a new property before the fixed term ends may still trigger a break cost if the new loan amount differs from the old one or if the lender re-prices the loan.

Accessing the 5% Deposit Scheme with Different Loan Structures

The Australian Government 5% Deposit Scheme allows eligible first home buyers to purchase with a 5% deposit without paying Lenders Mortgage Insurance. The scheme is available through a panel of participating lenders, and loan structure eligibility varies by lender.

Most participating lenders offer variable rate loans under the scheme. Fixed rate and split loan availability depends on the individual lender's policy. Some lenders allow you to fix part or all of the loan under the scheme, while others restrict scheme loans to variable rates only. The restriction is not imposed by Housing Australia but by the lender's own credit policy and funding arrangements.

A buyer using the scheme to purchase in Newstead with a 5% deposit should confirm loan structure options with their broker before assuming they can fix. If your priority is rate certainty and the lender does not allow fixed rates under the scheme, you may need to choose a different lender from the participating panel or accept a variable rate structure and plan to fix after settlement once the loan is no longer governed by scheme restrictions.

The property price cap for the scheme in Queensland is $1,000,000 for capital city and regional centre properties, which covers the Newstead unit median of $950,000 and provides access across most of Brisbane's inner-northern suburbs.

When to Lock in a Fixed Rate During Your Application

A fixed rate is not locked at the time of pre-approval. It is locked when you formally apply for the loan after signing a contract.

Fixed rates change daily based on movements in wholesale funding markets. The rate you see advertised today may not be the rate available when you are ready to lock. Most lenders allow you to lock a fixed rate once your loan application is submitted and you have a signed contract. The lock period is typically 90 days, meaning the rate is held for 90 days from the lock date or until settlement, whichever comes first.

If your settlement period exceeds 90 days, the fixed rate may expire and you will need to re-lock at whatever the current rate is at that time. In a rising rate environment, a long settlement period creates risk that your locked rate expires and the new rate is higher. In a falling rate environment, some lenders allow you to re-lock at a lower rate if rates have dropped since your original lock, but this is not universal.

A buyer purchasing an off-the-plan unit in Newstead with a 12-month settlement should be aware that fixed rates cannot be locked for the entire period. You will lock the rate closer to settlement, and the rate available at that time may differ significantly from the rate available at contract signing. This risk applies to fixed and split loans but not to variable loans, which are priced at the lender's current variable rate on the day of settlement.

Comparing Your Options with a Mortgage Broker

A mortgage broker can access rate cards and loan features across the full panel of lenders and compare them against your specific borrowing scenario.

The difference between the best and worst rate available to you for the same loan structure can be 30 to 50 basis points depending on your deposit size, loan amount, and the lender's current pricing. On a loan of $750,000, a 0.4% difference in rate equals approximately $3,000 per year in interest. Over a three-year fixed term, that is $9,000.

Brokers also identify lenders that allow specific combinations of features that may not be obvious from a lender's website. Some lenders allow an offset account on a split loan but only on the variable portion. Others allow up to $20,000 in extra repayments on a fixed loan without penalty, while most cap it at $10,000. Some lenders will approve a 90% loan-to-value ratio split loan under the 5% Deposit Scheme, while others will only approve variable. These details are not standardised and change by lender and by loan size.

The structure you choose should be tested against your actual numbers before you commit. Call one of our team or book an appointment at a time that works for you.

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