How to Understand Rate Lock-ins & Break Costs

Locking in a fixed rate on an investment loan gives you predictable repayments and protection from rate rises, but it also means you're bound to that rate until the term expires.

Break costs are the fee your lender charges if you pay out, refinance, or make extra repayments above the allowed limit before your fixed term ends. They exist because the lender priced your loan based on the wholesale funding cost at the time you locked in. If rates have since dropped, the lender loses money when you exit, and that loss is passed to you.

How Fixed Rate Lock-ins Work on Investment Loans

When you fix the rate on an investment loan, you agree to a set interest rate for a defined period, typically one to five years. The lender funds your loan using wholesale borrowing at a matching term, and your rate reflects that cost plus margin. If you break the contract, the lender is left holding funding it can no longer use as intended.

In our experience, property investors choose fixed rates when they want certainty over cash flow, especially if the property is held on interest-only terms and rental income is tight. A fixed rate removes the risk of repayment jumps for the duration of the lock-in. The trade-off is reduced flexibility. Most fixed products cap extra repayments at $10,000 to $30,000 per year, and some don't allow extra repayments at all. Refinancing or selling the property before the term ends will usually trigger a break cost calculation.

The Formula Behind Break Costs

Break costs are calculated by comparing the interest rate you locked in with the current wholesale rate for the remaining term. If the current rate is lower than your fixed rate, the lender calculates the present value of the interest shortfall over the remaining months and charges that amount.

Consider an investor who fixed $500,000 at 5.2 per cent for five years. Three years in, they decide to sell the property. At that point, two years remain on the fixed term. If the lender's current wholesale rate for a two-year term is 4.0 per cent, the lender will lose 1.2 per cent per year over those two years. The break cost reflects the present value of that gap, which in this scenario could be in the range of $10,000 to $12,000, depending on the lender's calculation method.

If rates have risen and the current wholesale rate is higher than your fixed rate, the break cost is typically nil. Some lenders call this a break gain, but they rarely refund the difference to you.

What Triggers a Break Cost

Break costs apply whenever you exit or alter your fixed rate loan before the term expires. Selling the property, refinancing to another lender, or switching to a variable rate with your current lender will all trigger the calculation.

Extra repayments beyond the annual allowance also count. If your fixed loan permits $20,000 in additional repayments per year and you pay $40,000, the excess $20,000 is treated as a partial break and the lender will calculate a cost on that portion. Offset accounts are generally not available with fixed rate investment loans, so any surplus cash sits idle unless you structure part of the loan on a variable rate with offset attached.

Porting your loan to a new property is sometimes offered, but availability varies by lender and you'll usually need to meet current serviceability and security standards.

Fixed, Variable or Split Rate Strategy

A split structure lets you fix part of your loan and leave the rest on a variable rate. This gives you rate protection on the fixed portion and flexibility on the variable portion, which can be used to make unlimited extra repayments or access an offset account.

As an example, an investor borrowing $600,000 might fix $400,000 at a rate that provides repayment certainty, and leave $200,000 on a variable rate linked to an offset account. Rental income, tax refunds and any surplus cash sit in the offset, reducing interest on the variable portion without triggering break costs. If the investor decides to sell or refinance, the fixed portion may still incur a break cost, but the variable portion can be repaid or switched without penalty.

When comparing investment loan options, ask the lender or broker to model split scenarios based on your deposit size, rental yield and likelihood of early exit. Some lenders price their fixed rates more sharply when you split, and others load the cost onto the variable portion.

When Refinancing Makes Sense Despite Break Costs

If variable rates have fallen significantly or you've found a lender offering a materially lower rate, it can still be worth refinancing even with a break cost. The calculation comes down to whether the interest saving over the remaining term exceeds the break fee.

We regularly see this with investors who fixed during a rate peak and are now facing higher repayments than current variable products. A broker can request a break cost estimate from your lender, compare it to the interest saving over 12 to 24 months, and show you the breakeven point. If you're planning to hold the property long term and the saving exceeds the fee within 18 months, refinancing usually makes sense.

Don't forget to factor in application fees, valuation costs and any differences in loan features when you model the switch. A lower rate isn't useful if the new loan removes your ability to claim interest or limits future borrowing against the property.

Avoiding Unintended Break Costs

Read your loan contract before you fix. Check the annual extra repayment limit, whether you can switch to interest-only or principal-and-interest mid-term, and whether porting is available. Some lenders let you break one fixed loan per calendar year without penalty if you're refinancing to another product with the same lender, but that's not standard.

If you're buying an investment property and there's any chance you'll sell, renovate or refinance within three years, either avoid fixing or fix only part of the loan. Fixed rates make sense when your investment strategy is stable, your rental income covers the repayment, and you're not relying on accessing equity in the short term.

If you're subject to the new negative gearing quarantine rules from 1 July 2027 and holding an established property, your ability to offset losses against other income is gone. That makes cash flow predictability even more important, which can tilt the decision toward fixing. Just make sure the fixed term aligns with your likely hold period.

Getting a Break Cost Estimate Before You Commit

Lenders are required to provide a break cost estimate if you request one, though the figure is only indicative until you formally discharge or refinance. Most lenders publish the estimate within two business days. If you're considering a sale or switch, get the number in writing before you commit to a contract or lodge a refinance application.

If the break cost is high and you have time, you can wait closer to the fixed term expiry and reassess. Some investors choose to sit tight, move onto the lender's variable rate when the fixed term ends, then refinance without penalty a few months later. That approach works if variable rates haven't jumped in the meantime and the new lender's rate is still lower.

Call one of our team or book an appointment at a time that works for you. We'll pull your current loan details, model the break cost scenario, and show you whether staying put or moving makes more sense based on your investment strategy and the property you're holding.

Frequently Asked Questions