Common Mistakes When Choosing Fixed Rate Loan Terms

Most software engineers pick a fixed rate term based on what the lender offers, not what actually aligns with their next career or property move.

If you're vesting RSUs in 18 months, planning to refinance when your probation ends, or considering a role change that might relocate you interstate, a standard three-year fixed term can create expensive friction. Fixed rate home loan products work well when the term matches your actual timeline, but they become a liability the moment you need flexibility before the term ends.

Why Fixed Rate Terms Default to One, Three, or Five Years

Lenders price fixed rate products around funding cycles and interest rate swap markets. The one, three, and five-year terms you see aren't designed around your career or property plans. They reflect what's efficient for the lender to hedge and sell. Some lenders offer two or four-year terms, but these are less common and often priced less sharply because the funding market for those durations is thinner.

Consider a software engineer who fixes for three years at the start of a new role. If they want to upgrade or relocate 18 months later, they'll face break costs that can run into thousands of dollars, depending on how much rates have moved since they locked in. The fixed rate itself might look attractive at application, but the term creates a penalty for doing anything that requires changing the loan structure before it expires.

Matching Fixed Terms to Vesting Schedules and Role Changes

If you're holding unvested RSUs or expecting a sign-on bonus to hit in 12 months, a one-year fixed term lets you lock in a rate now and then refinance or restructure once that equity or cash becomes available. You might use the vested RSUs to reduce your loan amount, switch to a variable rate for offset access, or move to a split structure that gives you more control over repayments.

A three-year fixed term works if you're staying in the same role and property for at least that long. If you're planning to move interstate, upgrade to a larger property, or shift to a contract role within two years, you're better off with a shorter fixed term or a split loan that keeps part of your borrowing flexible. The split lets you fix a portion for rate certainty while leaving the variable portion available for lump sum repayments or offset account use without triggering break costs.

How Break Costs Are Calculated on Fixed Rate Loans

Break costs apply when you exit a fixed rate early by refinancing, selling, or paying down more than the allowed annual limit. The calculation compares the fixed rate you're paying to the rate the lender can now earn by lending that money elsewhere. If rates have dropped since you fixed, the lender loses income and charges you the difference. If rates have risen, there's usually no break cost.

The longer the remaining term, the larger the potential break cost. Exiting a five-year fixed term after one year can cost significantly more than exiting a two-year term at the same point, because the lender is losing income over a longer period. Lenders don't advertise this clearly at application, and the size of the break cost isn't something you can predict with precision because it depends on wholesale rate movements.

Fixed Terms and Portability When You Upgrade or Relocate

Some lenders offer portable fixed rate loans, which let you transfer the fixed rate to a new property if you sell and buy within a specific window. Portability sounds useful, but it only works if the new loan amount is similar to the old one. If you're upgrading and need to borrow more, the additional borrowing will be at a different rate, often variable or a new fixed term at current pricing.

In our experience, portability clauses are rarely as flexible as they appear. If you're relocating interstate for a new role or upsizing because your household has changed, the loan amount usually shifts enough that portability doesn't cover the full transition. You end up with a partial fixed rate on the old loan amount and a new rate on the top-up, which creates a mixed structure that's harder to manage than a clean split loan designed that way from the start.

One-Year Fixed Terms as a Holding Strategy

A one-year fixed term works well when you want rate certainty for a short window but expect your situation to change soon. If you're in probation, waiting for a sign-on bonus to vest, or planning to move once a lease ends, a one-year fixed rate gives you predictable repayments without locking you into a structure that penalises change.

The downside is that one-year fixed rates are often priced higher than longer terms, because lenders know borrowers are likely to refinance or adjust quickly. You're paying for flexibility, but that cost is usually lower than the break fees you'd face exiting a longer fixed term early. If your income is about to change due to a role switch or you're expecting RSUs to vest, the one-year term keeps your options open without creating a financial barrier to restructuring.

When a Five-Year Fixed Rate Actually Makes Sense

Five-year fixed terms suit borrowers who are certain they won't need to change their loan structure, property, or location for that entire period. If you've just bought a property you plan to hold long-term, your role is stable, and you're not expecting major income changes, a five-year fix can offer strong rate certainty, especially if you're locking in during a period when rates are expected to rise.

The risk is that five years is a long time in a tech career. Promotions, relocations, redundancies, and portfolio changes all become more likely over that span. If any of those events require you to refinance, sell, or restructure, you'll be weighing the benefit of the fixed rate against the cost of exiting early. A split structure that fixes part of the loan for five years and leaves the rest variable gives you some of that certainty without eliminating flexibility entirely.

Split Loan Structures and How to Allocate Between Fixed and Variable

A split loan divides your borrowing between fixed and variable portions. You might fix 50% for three years and leave 50% variable, or fix 70% for rate certainty and keep 30% variable for offset access and lump sum repayments. The allocation depends on how much certainty you want versus how much flexibility you need.

If you're holding a large offset balance funded by RSUs or bonuses, keeping a variable portion lets you reduce interest without triggering break costs. If you're more focused on predictable repayments and don't expect to make extra repayments, a higher fixed allocation makes sense. The split structure is more complex to set up, but it avoids the all-or-nothing choice between locking in completely or staying fully variable.

How to Decide on a Fixed Term Length Before You Apply

Start by mapping out the next three to five years. When do your RSUs vest? When does your probation end? Are you planning to upgrade, relocate, or shift to contract work? If any of those events are likely within 18 months, a one-year fixed term or a split loan keeps your options open. If your situation is stable and you're confident you'll stay in the same property and role, a three or five-year fixed term offers more rate protection.

Don't assume the term with the lowest rate is the right choice. A three-year fixed rate might be 0.2% lower than a one-year, but if you need to refinance in 18 months, the break cost will outweigh the saving. The term should match your timeline, not just the headline rate. If you're unsure, a split structure or a shorter fixed term gives you more room to adjust as your situation evolves.

Call one of our team or book an appointment at a time that works for you. We'll walk through your vesting schedule, role plans, and property timeline to match a fixed term that actually fits.

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