When to Lock in a Fixed Rate as a First Home Buyer

A fixed rate loan locks your interest rate for a set period, giving you certainty over repayments during that time.

First home buyers in Sydney often face a choice between fixing all or part of their loan and leaving it on a variable rate. The decision depends on your tolerance for repayment changes, your budget margin, and whether you value rate protection over flexibility. A fixed rate loan removes the risk of rate rises during the fixed period but also removes your ability to make extra repayments beyond small annual limits and removes access to features like an offset account.

This article walks through how fixed rate loans work for first home buyers, what you give up when you fix, and when that trade-off makes sense.

What You Give Up When You Fix Your Rate

Most lenders do not allow offset accounts on fixed rate loans and restrict extra repayments to around $10,000 to $30,000 per year depending on the lender. If you fix your rate, you lose the ability to park savings in an offset to reduce interest or make large lump sum repayments without penalty. If you break the fixed rate early by refinancing, selling, or paying down the loan beyond the extra repayment limit, you may face break costs that can run into thousands of dollars.

Consider a buyer who purchases in Penrith with a 10% deposit and fixes their rate for three years. They receive a pay increase 18 months later and want to put an extra $40,000 into the loan. The lender allows only $20,000 in extra repayments per year on the fixed portion. The buyer either holds the surplus in a savings account earning interest at a lower rate than the loan, or they refinance and pay a break cost that depends on the difference between their fixed rate and the rate the lender can now earn on the wholesale market. In this scenario, the buyer gave up control over their repayment strategy in exchange for three years of rate certainty.

Variable rate loans with an offset account allow you to reduce interest without locking funds into the loan, and they allow unlimited extra repayments at any time without penalty.

When a Fixed Rate Makes Sense for Your Budget

A fixed rate works when your budget has little room for repayment increases and you need to know exactly what you will pay over the next few years. If your income is stable but tight, or if you are borrowing close to your maximum capacity, fixing part or all of your loan removes the risk that a rate rise forces you to cut spending elsewhere or miss repayments.

In our experience, buyers who fix successfully are those who have a limited savings buffer after settlement and who prefer to plan around a fixed repayment amount rather than monitor rate movements. Buyers who fix unsuccessfully are usually those who did not account for the loss of flexibility and later regretted the inability to make extra repayments or refinance without cost.

Split Rate Loans for First Home Buyers

A split rate loan divides your loan into a fixed portion and a variable portion. The fixed portion gives you rate certainty, and the variable portion retains access to an offset account and unlimited extra repayments. Most lenders allow you to split the loan in any proportion, such as 50/50 or 70/30.

A buyer purchasing in Parramatta with a 5% deposit under the Australian Government 5% Deposit Scheme might fix 60% of the loan to protect the majority of their repayments and leave 40% variable with an offset. This allows them to build savings in the offset over time and reduce interest on the variable portion while still benefiting from fixed rate protection on the larger share of the loan. The split structure means they avoid putting all their borrowing into one rate structure and retain some flexibility without giving it up entirely.

Split loans require two loan accounts and may involve two sets of fees, but most lenders charge the same application and ongoing fees whether you have one loan or a split. Confirm the fee structure with your broker before proceeding.

Fixed Rate Terms and What Happens When They End

Fixed rate terms typically range from one to five years. At the end of the fixed term, the loan automatically reverts to the lender's standard variable rate unless you refinance or negotiate a new fixed rate before expiry. The standard variable rate is usually higher than the discounted variable rate offered to new borrowers, so you may see a repayment increase even if the cash rate has not moved.

Buyers approaching the end of a fixed term should review their loan at least three months before expiry. You can refinance to a new lender, negotiate a new rate with your current lender, or refix with your current lender if you still want rate certainty. Refinancing may involve application fees, valuation fees, and settlement costs, but it also gives you access to current interest rate discounts and loan features that may not have been available when you first borrowed. If you are on a fixed rate loan that is due to expire soon, a fixed rate expiry review with a broker will show you what rates and features are now available and whether refinancing or staying put makes more sense for your situation.

How First Home Buyer Concessions Work with Fixed Rate Loans

First home buyer concessions such as stamp duty exemptions and the Australian Government 5% Deposit Scheme apply regardless of whether you choose a fixed or variable interest rate. In New South Wales, eligible first home buyers receive full stamp duty exemption on properties up to $800,000 and a sliding concession on properties between $800,000 and $1,000,000. These concessions reduce the upfront cost of buying but do not restrict your choice of loan structure.

The 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 31 lenders, and most of those lenders offer both fixed and variable rate options. If you are borrowing with a low deposit, confirm with your broker which lenders on the panel offer the loan features you want, such as offset accounts, split rate options, or the ability to make extra repayments. Not all lenders structure their fixed rate products the same way, and some allow higher annual extra repayment limits than others.

Fixed Rate Loans and Borrowing Capacity

Lenders assess your borrowing capacity by applying a serviceability buffer, which is typically 3% above the loan's interest rate. Some lenders assess fixed rate loans at the fixed rate plus the buffer, while others assess at the higher of the fixed rate or the standard variable rate plus the buffer. The assessment method can affect how much you can borrow, particularly if you are fixing at a rate lower than the lender's standard variable rate.

A buyer applying for a home loan with a 5% deposit may find that one lender offers a higher borrowing capacity because they assess the fixed rate at the actual fixed rate plus buffer, while another lender assesses at their standard variable rate plus buffer regardless of the fixed rate chosen. This difference is not always disclosed upfront and is one reason why working with a broker who compares assessment policies across lenders can increase the amount you can borrow or reduce the deposit you need to save.

When to Speak to a Broker About Fixed Rate Loans

If you are a first home buyer trying to decide whether to fix your rate, speak to a broker before you apply. A broker can show you the fixed and variable rates available across the panel of lenders they work with, explain the extra repayment limits and break cost terms for each lender, and model what your repayments would look like under different rate scenarios. They can also structure a split rate loan if you want partial rate certainty without giving up all flexibility.

Call one of our team or book an appointment at a time that works for you.

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