Common Mistakes First Home Buyers Make With Fixed Rates

Fixed Rates Lock You Out of Offset Access

Most lenders don't allow offset accounts on fixed rate home loans. You can have one or the other, but not both at the same time. A few lenders do offer fixed loans with partial offset functionality, but the rate is usually higher, and the offset percentage is capped at 60% or 70% of the loan balance. That means if you fix your rate to lock in certainty, you'll lose the flexibility to park extra cash against your mortgage and reduce the daily interest charged.

Consider a dental assistant buying a two-bedroom unit close to work. She has $25,000 saved, puts down a 10% deposit, and takes out a loan under the First Home Guarantee to avoid paying Lenders Mortgage Insurance. She fixes the full loan amount at the current rate for three years, attracted by the certainty of knowing exactly what her repayments will be. Six months later, she receives a $5,000 bonus from her practice. With no offset account attached to her fixed loan, she can either park the money in a savings account earning minimal interest, put it into the loan's redraw facility (if available), or hold it elsewhere. She can't use it to reduce the interest charged daily on her mortgage balance the way she could with an offset.

The offset account attached to a variable rate loan recalculates interest every day based on the combined balance of your loan minus the cash sitting in the offset. On a $300,000 loan at current variable rates, having $20,000 in offset could reduce your annual interest bill by more than $1,000. On a fixed loan without offset, that same $20,000 either sits in a low-interest savings account or goes into redraw, where access can be restricted and the tax treatment differs if you later convert the property to an investment.

The Split Strategy That Solves the Offset Problem

Splitting your loan between fixed and variable portions gives you rate protection on one part and offset access on the other. You might fix 60% of the loan for certainty and leave 40% variable with an offset account attached. Any extra income, bonuses, or irregular payments go into the offset account, reducing interest on the variable portion while the fixed portion stays locked at the agreed rate.

In our experience, dental assistants who receive quarterly or annual bonuses benefit from keeping at least 30% to 40% of the loan variable with offset. The fixed portion protects you if rates rise, and the variable portion with offset lets you make the most of any surplus cash without losing access or flexibility. You're not forced to choose between certainty and control.

Some lenders let you split a loan into multiple portions at application, others require the split to be set up after settlement. The application process doesn't change much, but knowing which lenders offer true offset on the variable split, and which rate applies to each portion, matters more than most first home buyers realise when they're comparing home loan options.

Redraw Facilities Are Not the Same as Offset Accounts

A redraw facility lets you withdraw extra repayments you've made above the minimum, but it's not a substitute for an offset account. Redraw is a feature controlled by the lender. They can restrict access, charge a fee, or require a minimum withdrawal amount. Offset accounts are transaction accounts in your name. The cash is yours, available any time, and the bank calculates interest daily based on the balance.

If you fix your rate and make extra repayments into a loan with redraw, you may find the lender restricts how much you can pull back out, especially if you've refinanced or changed the loan structure. Offset balances are quarantined from that risk. The money sits in your account, reduces your interest, and remains fully accessible without needing lender approval.

For tax purposes, redraw can also create complications if you later turn your home into an investment property. Withdrawing funds from redraw can reduce the deductible portion of your loan. Offset accounts don't have that issue because the cash never technically enters the loan. It just offsets the balance for interest calculation purposes. If you're planning to hold the property long-term and may eventually rent it out, keeping surplus funds in offset rather than redraw protects your future deductions.

How the First Home Guarantee Affects Your Fixed Rate Decision

The expanded First Home Guarantee now has no income cap and allows you to borrow with a 5% deposit without paying Lenders Mortgage Insurance. That opens up low deposit options that weren't available to many dental assistants even a year ago. But the scheme doesn't dictate whether you fix or go variable. That decision is still yours, and it still depends on your cash flow, job security, and how you plan to manage surplus income.

If you're using the guarantee and buying with a smaller deposit, you'll have less equity in the property initially. That makes offset access more valuable, because any cash you can park against the loan reduces interest and accelerates equity build-up without locking funds away. Fixing the entire loan in that scenario can leave you with no flexibility to offset surplus income, which is exactly when you need it most.

Some buyers using the guarantee choose to fix a portion for 12 to 24 months rather than the full three or five years. Shorter fixed terms usually come with slightly lower rates, and they let you reassess sooner without triggering large break costs if your situation changes. You'll still need to consider whether the lender offers offset on the variable portion and whether the rate difference between fixed and variable justifies losing offset access on the fixed part.

When Fixing the Full Loan Still Makes Sense

If your income is stable, your expenses are predictable, and you have no expectation of receiving irregular bonuses or gifts, fixing the full loan can work. You're not giving up anything you were going to use. The certainty of fixed repayments lets you budget accurately, and you avoid the risk of rate rises during the fixed period.

Dental assistants working in private practice often receive performance-based payments, end-of-year bonuses, or shift allowances that vary. In that case, fixing the full loan means those payments can't be used to reduce your mortgage interest in real time. But if you're salaried in a public clinic with no variable income, the value of offset diminishes and the protection of a fixed rate becomes more relevant, particularly if you're buying at a time when variable rates are expected to move.

The other scenario where full fixed makes sense is if you're planning to pay only the minimum repayment for the foreseeable future because you're directing surplus cash elsewhere, such as into superannuation under the First Home Super Saver Scheme or towards other debt. In that case, you're not losing offset functionality because you weren't going to use it anyway.

Understanding Break Costs Before You Fix

If you fix your rate and then need to exit the loan early, sell the property, or refinance, you may be charged break costs. These apply when you discharge a fixed loan before the end of the fixed term and interest rates have fallen since you locked in. The lender calculates the difference between the rate you're paying and the rate they can now lend that money at, then charges you the lost interest.

Break costs are not a flat fee. They vary based on how much time is left on your fixed term, how much rates have moved, and the size of your loan. On a $400,000 fixed loan with two years remaining, if rates have dropped significantly, break costs could run into tens of thousands of dollars. If rates have risen or stayed flat, the break cost may be zero.

You can't predict break costs at the time you fix, which is why fixing the full loan for a long term carries more risk if there's any chance you'll need to move, upsize, or refinance. Splitting the loan limits your exposure. If you need to sell or refinance, you'll only pay break costs on the fixed portion. The variable portion can be discharged without penalty.

Call one of our team or book an appointment at a time that works for you. We'll walk through your income pattern, your savings behaviour, and whether a split or a full fix makes more sense given where you're buying and how you're structuring the deposit. We work with lenders who offer genuine offset on variable splits, and we'll show you the rate difference on paper before you make the call.

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