Fixed vs. Variable Rate Mortgages: Which Is Right for You?

One of the most consequential decisions you make when taking out a home loan is whether to choose a fixed or variable interest rate. Both have genuine advantages, and the right choice depends on your financial circumstances, risk tolerance, and outlook on interest rates. This guide explains how each works and what to consider before deciding.

Fixed Rate Mortgages

A fixed rate mortgage locks in your interest rate for a defined period, typically one to five years. During this period, your repayment amount does not change regardless of what happens to interest rates in the broader market. After the fixed period ends, the loan usually reverts to a variable rate unless you refinance to a new fixed term.

Advantages: Repayment certainty, easier budgeting, and protection against rate increases during the fixed period.

Disadvantages: Fixed rates are typically set slightly higher than variable rates at the time of borrowing, reflecting the certainty premium. Break costs if you want to exit or refinance during the fixed term can be very high. Extra repayments are usually capped or not permitted.

Variable Rate Mortgages

A variable rate mortgage moves in line with an underlying benchmark rate, typically the central bank's official cash rate or a bank's standard variable rate. When rates fall, your repayments decrease. When rates rise, repayments increase.

Advantages: Generally lower starting rates, flexibility to make unlimited extra repayments, ability to access redraw facilities or offset accounts, and no break costs if you want to refinance.

Disadvantages: Repayment uncertainty, exposure to rate increases, and the psychological difficulty of managing a budget when repayments can change.

Split Loans

Many lenders allow you to split your mortgage between fixed and variable portions. For example, you might fix 60% of the loan for certainty on the majority of your debt, while keeping 40% variable to retain flexibility for extra repayments. This is a practical middle-ground for borrowers who want some protection against rate rises without sacrificing all flexibility.

Break Costs on Fixed Loans

If you exit a fixed rate loan before the fixed period ends, most lenders charge a break cost. This fee compensates the lender for the economic cost of re-deploying the funds at a different rate. Break costs can range from negligible to tens of thousands of dollars depending on how rates have moved since you fixed. This is an important consideration if there is any chance you may sell the property, refinance, or make a large lump-sum repayment during the fixed period.

Which Should You Choose?

There is no universally correct answer. Consider fixing if you are on a tight budget and need repayment certainty, if you believe rates are likely to rise, or if you are buying in a period of historically low rates. Consider variable if you want maximum flexibility, if you plan to make extra repayments or pay the loan off faster, or if you want access to offset accounts and redraw facilities. A split loan may suit you if you want elements of both.

Feature	Fixed Rate	Variable Rate
Repayment certainty	Yes	No
Extra repayments	Limited or not permitted	Usually unlimited
Redraw / offset	Usually not available	Commonly available
Break costs	Can be substantial	None
Starting rate	Usually slightly higher	Usually slightly lower

Key Takeaway

Fixed and variable rate mortgages both have legitimate roles. The right choice depends on your need for certainty versus flexibility and your expectations about future rate movements. A split loan can be a practical compromise. Whatever you choose, understand the break costs and repayment restrictions before committing.