Fixed Rate Loans and Extra Repayments: Avoid These 3 Mistakes

Most fixed rate home loans in Australia come with a hard limit on extra repayments, typically between $10,000 and $30,000 per year. Go beyond that threshold and you'll trigger break costs that can wipe out any benefit you were chasing.

The decision you're making right now is whether to lock in your rate, and if so, how to structure that loan so you can still pay it down without penalty. The answer depends on how much extra you're likely to repay over the fixed period, not just whether you want the security of knowing your rate won't move.

The Annual Repayment Cap That Catches Most Borrowers

Every lender sets a cap on extra repayments during a fixed rate term, usually between $10,000 and $30,000 per year. Once you exceed that cap, the lender calculates a break cost based on the difference between your fixed rate and the wholesale rate they can now lend that money at. If rates have dropped since you fixed, you're effectively compensating the lender for lost interest income.

Consider a borrower in Tarneit who fixed at 5.8% for three years and then received an inheritance 18 months in. They wanted to put down $80,000, but their loan had a $20,000 annual cap. The additional $60,000 triggered a break cost of just under $4,000 because variable rates had fallen to 5.2%. They paid the fee, cleared the loan early and still came out ahead, but the cost was a surprise because they hadn't checked the product disclosure statement before fixing.

If you're planning to sell within the fixed term, receive a bonus or inheritance, or regularly put lump sums toward your mortgage, a fully fixed loan will restrict that flexibility. Some lenders waive break costs if you're selling and taking a new loan with them, but that only helps if you're upgrading or relocating, not if you're paying down debt.

Split Loans Let You Pay Extra Without Breaking Your Fixed Rate

A split loan divides your borrowing between fixed and variable portions, giving you rate certainty on one part and full flexibility on the other. You can make unlimited extra repayments to the variable portion without triggering any penalty, while the fixed portion protects you if rates climb.

In our experience, clients who expect to make more than $10,000 in extra repayments each year are better off splitting 50/50 or 60/40 in favour of variable. That structure keeps the fixed portion large enough to provide meaningful protection, while the variable side absorbs any lump sums, bonuses or regular additional payments.

A split also means you're not trying to predict the market. If rates rise, the fixed portion keeps your repayments stable. If they fall, the variable portion drops immediately and you're not locked into an above-market rate across your entire loan. The downside is slightly higher complexity, you'll have two loan accounts and two sets of statements, but most borrowers find that trade-off worthwhile once they understand the cost of breaking a fixed loan early.

Offset Accounts Don't Work on Most Fixed Rate Loans

Most lenders do not offer a linked offset account on a fixed rate loan. If they do, the offset percentage is often capped at 20% to 40%, meaning only a portion of your savings balance reduces the interest you're charged. On a variable loan or the variable portion of a split, a full 100% offset is standard and every dollar in the account reduces the interest calculated on your loan that day.

The lack of a functioning offset on a fixed loan is one of the bigger mistakes we see. A buyer in the Tarneit area might fix their entire loan to lock in a rate, then realise they've got $40,000 sitting in a savings account earning 3% while their mortgage is costing them 5.8%. Without an offset, that cash isn't working for them. If they'd kept even 40% of the loan variable with a linked offset, that $40,000 would reduce their interest bill by more than $2,000 a year.

If you're holding savings for renovation, a future investment deposit, or just general liquidity, you need that money in an offset account, not a separate savings account. That means keeping at least part of your loan variable or choosing a lender that offers a partial offset on the fixed portion, though those products are becoming harder to find.

What Happens If You Need to Refinance or Sell During the Fixed Term

Break costs also apply if you refinance or sell the property before the fixed term ends. The lender will calculate the cost using the same formula: the difference between your fixed rate and the current wholesale rate, multiplied by the remaining loan balance and the time left on the fixed term.

If rates have risen since you fixed, there's usually no break cost because the lender can now lend that money at a higher rate. If rates have fallen, the cost can run into the thousands or even tens of thousands depending on your balance and how much time is left. Some lenders offer portability, meaning you can transfer your fixed rate loan to a new property without penalty, but that only works if you're buying again and the new loan amount is equal to or greater than the amount you're porting across.

Before you fix, consider how likely you are to move, whether your household income might change, or if there's any chance you'll want to access equity in the next few years. A fixed rate loan ties up that equity unless you're willing to pay the break cost. For first home buyers in growth areas like Tarneit, that can be a real issue if you want to upgrade or invest within three to five years.

How to Structure a Fixed Rate Loan If You Still Want Flexibility

If you want rate certainty but also expect to make extra repayments, a 50/50 split with a full offset on the variable side covers most scenarios. You fix half the loan for two to three years to protect against rate rises, and you direct all extra repayments and savings to the variable portion. That way you're not guessing how much extra you'll repay each year, and you're not risking a penalty if your circumstances change.

Another approach is to fix a smaller portion, say 30% to 40%, and keep the majority variable. This works well if you're less concerned about rate rises and more focused on paying the loan down quickly. You still get some protection, but you're not locked into a structure that charges you for making progress.

Whatever split you choose, make sure the variable portion has a linked offset account and no monthly fees. Some lenders charge a fee for each split, which can add up if you're trying to keep costs down. Check the product disclosure statement and ask your broker to confirm the annual repayment cap on the fixed portion before you settle. That number matters more than the interest rate if you're planning to pay extra.

A fixed rate loan can still make sense in the current environment, but only if it's structured around how you actually use your mortgage, not just around the lowest advertised rate. If you're likely to make extra repayments, need access to an offset, or might move within a few years, a split loan is almost always the smarter option. If you're fixing the whole amount, check the annual cap, understand the break cost formula, and make sure you're comfortable with the restrictions before you lock anything in.

Call one of our team or book an appointment at a time that works for you. We'll run through your repayment plans, talk through how much you're likely to pay extra over the next few years, and structure a loan that gives you the certainty you're after without locking you into a corner.

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