10 Things to Know About Fixed Rate Home Loans

Fixed Rate Home Loans Lock Your Repayments for a Set Period

A fixed rate home loan holds your interest rate steady for an agreed term, typically between one and five years. Your repayments stay the same regardless of what happens to variable rates during that period. Once the fixed term ends, your loan reverts to the lender's variable rate unless you renegotiate.

The attraction is certainty. You know exactly what leaves your account each month, which makes budgeting more predictable. That certainty costs something in flexibility, though. Fixed rate products usually restrict extra repayments, limit access to offset accounts, and charge break costs if you exit early.

How Fixed Rate Break Costs Are Calculated

Break costs apply when you pay out a fixed rate loan before the term ends. The lender calculates the difference between the rate you locked in and the current wholesale rate for the remaining period. If rates have fallen since you fixed, you pay the lender for the lost interest they would have earned.

Consider a borrower who fixed $500,000 at 3.5% for three years. Eighteen months later, they sell the property. If the lender's current wholesale rate for the remaining eighteen months sits at 2.8%, the break cost covers the gap between what the lender expected to earn and what they can now earn by lending that money elsewhere. The calculation involves economic cost formulas that most lenders outline in their loan contracts, but the result can run into tens of thousands of dollars depending on how far rates have moved.

Some lenders waive break costs if you port the loan to a new property, though that option depends on settlement timing and eligibility. Others reduce the break cost if you refinance to a new product with the same lender. Reading the fine print before you fix matters as much as the rate itself.

When Break Costs Work in Your Favour

Break costs can also work the other way. If rates rise sharply after you fix, and you exit the loan early, the lender may owe you money rather than the reverse. The economic cost formula still applies, but in your favour.

This happened during recent rate cycles when borrowers who fixed at lower rates found their break costs calculated as negative amounts. The lender effectively paid them to exit because the lender could now re-lend that money at a higher rate than the borrower had locked in. Not every lender passes this through as a credit, though. Some contracts cap the benefit at zero, meaning you pay nothing to break but receive nothing back either. Checking how your lender treats negative economic costs before signing gives you another data point when comparing products.

Split Rate Loans Balance Certainty and Flexibility

A split loan divides your borrowing between fixed and variable portions. You might fix 60% of your loan and leave 40% variable, or choose a different ratio depending on your priorities. The fixed portion gives you repayment certainty, while the variable portion lets you make extra repayments, access an offset account, and avoid break costs if you need to sell or refinance.

In our experience, borrowers who expect income to vary or plan to make lump sum repayments find a split structure more forgiving than locking the entire amount. You still reduce exposure to rate rises on the fixed portion, but you keep enough on variable to absorb extra cash without penalty.

Rate Lock Periods Protect You During Application

When you apply for a fixed rate loan, the lender offers a rate lock period, usually between 60 and 120 days. This guarantees the rate you applied for, even if rates rise before settlement. If rates fall during that window, some lenders let you relock at the lower rate, though not all do.

Rate lock periods matter during busy property markets when settlement can stretch beyond 60 days. If your lock expires before settlement, the lender applies whatever fixed rate is current at that time, which could be higher than the rate you budgeted for. Extending a lock usually costs a fee, often calculated as a percentage of the loan amount. For construction loans, where drawdowns happen in stages, coordinating your lock period with the final drawdown date becomes more complex. Discussing timing with your broker before signing a contract saves confusion later. You can explore construction loans in more detail if your purchase involves a building phase.

Fixed Rates Suit Borrowers Who Value Predictability Over Savings

Fixed rates work for borrowers who prioritise knowing their repayment amount over chasing the lowest possible cost. If you operate a household budget with limited margin for rate increases, or if you plan major expenses around a fixed outgoing, locking your rate removes one variable from your planning.

Variable rates, by contrast, give you more flexibility to pay down your loan faster, access features like offset accounts, and avoid break costs if your circumstances change. Over long periods, variable rates have historically cost less than fixed rates because lenders price fixed products with a margin for uncertainty. That margin reflects their own funding costs and the risk they take by locking in your rate.

The decision rests on whether you value certainty more than you value flexibility and potential savings. Neither approach is wrong, but mixing the two through a split structure often suits borrowers who want both.

What Happens When Your Fixed Term Ends

At the end of your fixed period, your loan reverts to the lender's standard variable rate unless you take action. That rate is usually higher than the discounted variable rates offered to new customers, sometimes by a full percentage point or more. Your repayments can jump significantly if you do nothing.

Most lenders contact you 30 to 90 days before your fixed term expires, offering you the option to refix at a new rate or switch to a variable product. This is also when many borrowers refinance to another lender if their current lender's rates no longer suit. If you have been managing your loan well and your property value has held or increased, your loan to value ratio improves, which can qualify you for lower rates elsewhere. Reviewing your options before the expiry date, rather than waiting for the lender to contact you, gives you more time to compare and negotiate. We cover this process in detail on our fixed rate expiry page.

Offset Accounts Are Rarely Available on Fixed Rate Loans

Most fixed rate products do not offer a linked offset account. The structure of a fixed loan depends on the lender knowing exactly how much interest you will pay over the fixed term. An offset account, which reduces the balance on which interest is calculated, introduces uncertainty into that equation.

Some lenders offer a partial offset on fixed loans, capping the offset benefit at a certain percentage or allowing only a portion of your savings to count. Others offer no offset at all. If you carry a significant cash balance and rely on an offset to reduce interest, fixing your entire loan may cost you more in lost offset benefits than you gain in rate certainty.

This is one reason split loans appeal to borrowers who want to keep an offset working on part of their debt while fixing the remainder. The variable portion carries the offset, and the fixed portion carries the certainty.

Fixed Rate Loans Limit Extra Repayments

Fixed rate loans typically cap extra repayments at $10,000 to $30,000 per year, depending on the lender. Any amount beyond that limit triggers a break cost, even if you are not exiting the loan entirely. If you expect a bonus, inheritance, or other lump sum, and you plan to use it to pay down your loan, fixing the full amount may not suit your circumstances.

Some borrowers work around this by fixing only the portion they plan to repay at the minimum rate, then leaving the rest on variable. That way, any extra funds go toward the variable portion without penalty. Mapping your expected income and expenses over the fixed period before you commit helps avoid paying break costs for the privilege of reducing your own debt.

Portability Lets You Transfer Your Fixed Loan to a New Property

Portability allows you to move your fixed rate loan from one property to another without paying break costs. Not all lenders offer this feature, and those that do usually require both settlements to occur on the same day or within a narrow window.

In practice, porting a loan can be difficult to coordinate. If your sale settles before your purchase, you need to pay out the loan and trigger break costs anyway. If your purchase settles first, you need another source of funds to bridge the gap. Even when timing aligns, the lender reassesses your borrowing capacity and the new property's suitability as security, which can delay or block the transfer.

Portability is worth asking about when you fix, but it rarely works as smoothly as it sounds in the brochure. If you expect to move during the fixed term, keeping more of your loan on variable or choosing a shorter fixed period reduces your exposure to break costs.

Fixed rate loans serve a purpose when certainty matters more than flexibility. They suit borrowers who budget tightly, who expect rates to rise, or who simply value knowing their repayment amount for the next few years. They do not suit borrowers who plan to make large extra repayments, who may need to sell or refinance, or who rely on an offset account to manage interest costs. Most borrowers land somewhere in between, which is why split structures exist.

Call one of our team or book an appointment at a time that works for you. We can compare fixed, variable, and split options across lenders and structure a loan that fits your income, timeline, and priorities without locking you into features you will not use.

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