Everything You Need to Know About Fixed Rates and Offsets

Fixed Rate Loans Don't Work With Standard Offset Accounts

A fixed rate loan locks your interest rate for a set period, typically one to five years. The catch is that most lenders don't attach full offset accounts to fixed rate products. Instead, they offer redraw facilities, which allow you to make extra repayments and pull that money back when needed, but without the tax flexibility or accessibility of a true offset.

The difference matters if you're an investor or someone who receives irregular income. Redraw balances reduce your loan principal, which sounds helpful until you realise that re-accessing those funds can trigger tax complications for investment properties or require lender approval. An offset account sits separately from your loan, so the balance stays liquid and doesn't affect how the ATO views your deductible debt.

Consider a buyer purchasing an owner-occupied property who expects to convert it to an investment within three years. Putting extra cash into a fixed rate loan via redraw now means those funds become mixed with the principal when the property converts. Keeping them in an offset would have preserved a clear separation, making the maximum amount of interest tax-deductible later.

Split Rate Structures Let You Use Both

A split loan divides your total borrowing into two portions, one on a fixed rate and one on a variable rate. The variable portion can have a full offset account attached, while the fixed portion remains locked at your chosen rate. This setup is commonly used when buyers want rate certainty on part of their debt but still want the flexibility and offset benefits that come with a variable loan.

In our experience, a 50/50 split is common, though there's no requirement to divide evenly. You might fix 70% of the loan if rate stability is the priority, or fix only 30% if you plan to make large additional repayments and want most of your borrowing accessible through the offset. The ratio depends on your cash flow, risk tolerance, and whether you expect rates to rise or fall during the fixed period.

Lenders treat each portion as a separate loan account, so you'll see two balances on your statements. Repayments are calculated separately as well, though most lenders combine them into a single monthly deduction from your account. If you're refinancing or restructuring, keep in mind that break costs apply only to the fixed portion, not the variable side.

How Offset Accounts Reduce Interest Without Changing Your Rate

An offset account is a transaction account linked to your home loan. The balance in the offset is subtracted from your loan balance before interest is calculated each day. If you have a loan of $500,000 and $30,000 sitting in the offset, you pay interest on $470,000. The interest rate itself doesn't change, but the amount of interest charged does.

This is not the same as making extra repayments into the loan. Money in an offset remains yours to spend, transfer, or withdraw at any time without lender approval. It's still earning value by reducing your interest, but it's never locked away. That distinction is useful if you're saving for renovations, holding funds for tax payments, or keeping a buffer for irregular expenses.

For someone on a variable rate with offset, every dollar in that account works against the loan balance. If you're paid monthly and your mortgage comes out mid-month, keeping your salary in the offset for those two weeks reduces the interest charged during that period. It's a small saving on each cycle, but it compounds over the life of the loan. That's why we regularly see buyers with variable loans channel all their income through the offset, even if they're also spending from it.

Why Lenders Rarely Offer Full Offsets on Fixed Rates

Lenders price fixed rate loans by locking in their funding cost for the term you choose. They borrow or allocate capital at a set rate and pass that rate to you with a margin attached. If you're paying down the loan faster than expected or keeping a large offset balance that reduces the interest they collect, the lender's margin shrinks and the funding cost stays the same. That's why fixed rate loans either don't allow offsets or limit them to partial offsets that only reduce interest on a portion of the balance.

Some lenders do offer partial offset accounts on fixed rates, typically offsetting between 20% and 60% of the loan balance depending on the product. These are less common and often come with a higher interest rate or annual fee to compensate the lender for the reduced interest income. Whether that trade-off is worth it depends on how much you expect to hold in the offset and how long you plan to keep the fixed rate in place.

If you're comparing fixed rate products and one offers a partial offset, calculate whether the interest saved by the offset outweighs the higher rate or fees. In most cases, if you're not holding a significant balance in the offset consistently, you're better off with a lower fixed rate and no offset at all. If you are holding substantial savings, a split rate structure might deliver more value than a partial offset.

Fixed Rate Break Costs Can Outweigh the Benefit of Switching

Break costs apply when you exit a fixed rate loan early, whether by refinancing, selling the property, or paying out the loan in full. The cost is based on the difference between the rate you're paying and the rate the lender can now earn by re-lending that money for the remaining fixed term. If rates have fallen since you fixed, the lender loses income and passes that cost to you. If rates have risen, there's typically no break cost because the lender can re-lend at a higher rate.

These costs can run into the thousands or even tens of thousands depending on your loan size, the time left on the fixed term, and how far rates have moved. That's why fixing your rate is not a decision to take lightly if there's any chance you'll need to sell, refinance, or access equity before the fixed period ends. It's also why split loans can be useful as a risk management tool, because if you need to exit early, only the fixed portion attracts break costs.

We've seen scenarios where a buyer fixed for three years, then needed to sell 18 months in because of a job relocation. Rates had dropped by more than half a percent in that time, and the break cost came to just over $12,000 on a $600,000 fixed loan. That wiped out most of the savings they'd made by locking in the lower rate. A split structure with only half the loan fixed would have halved that exit cost.

Using a Split Loan to Build Equity Faster on the Variable Side

When you split your loan and attach an offset to the variable portion, any extra cash you hold in that account reduces the interest charged on the variable side but leaves the fixed portion unchanged. That means your minimum repayment stays the same across both portions, but the interest component on the variable side drops while the principal component increases. Over time, you're paying down the variable portion faster without affecting the fixed rate or triggering any break costs.

This approach works well if you want rate certainty on part of your borrowing but also want to reduce your overall debt ahead of schedule. The offset gives you flexibility to pull the funds back if needed, while the fixed portion provides a floor under your repayments so you're not exposed to rate rises on the full balance.

As an example, someone with a $700,000 loan might fix $350,000 for three years and leave $350,000 on a variable rate with a linked offset. They keep $40,000 in the offset, which brings the effective variable balance down to $310,000. The interest saved on that $40,000 each month goes toward paying down principal instead, and they still have access to the full $40,000 at any time. If rates rise during the fixed period, the fixed portion is protected. If rates fall, the variable portion benefits immediately and there's no break cost to switch.

What Happens to the Offset When the Fixed Period Ends

When your fixed rate term ends, the loan automatically reverts to the lender's standard variable rate unless you proactively choose a new fixed term or refinance. At that point, if your loan is still split, the former fixed portion usually becomes a standard variable loan and you can request an offset account be attached to it. Some lenders will combine both portions into a single variable loan with one offset, while others keep them separate unless you ask to consolidate.

If you're planning to refix, you'll need to choose a new fixed rate product, and the same rules apply as before. Most fixed products still won't offer a full offset, so if you want to keep that feature, you'll either need to keep the loan split or move entirely to a variable rate with offset. That decision depends on where variable rates are sitting at the time and whether you still want the certainty that comes with fixing.

Don't assume your lender will notify you about offset options when the fixed term ends. In most cases, the reversion happens automatically and you'll need to contact your lender or broker to request product changes or account linking. If you're working with a broker, flagging your fixed rate expiry a few months in advance means there's time to compare rates and restructure without rushing.

If you're weighing up whether a fixed rate, variable rate with offset, or split structure suits your situation, call one of our team or book an appointment at a time that works for you.

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