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Mortgage Basics

Fixed-rate break-cost traps

Fixing locks your rate, but it also locks you in. Selling, refinancing, or overpaying during the fixed term can trigger a break cost that runs into the thousands. Here's how it works.

6 min read·Reviewed 26 June 2026·Ratesniffers Editorial Team

What is a break cost on a fixed home loan?

A break cost is what a lender can charge if you exit a fixed rate before the term ends, whether by refinancing, selling, or making large extra repayments. It compensates the lender for the interest it expected to earn over the remaining fixed period. It is largest when market rates have fallen since you fixed, because the lender would now re-lend that money at a lower rate. On a large loan with years left to run, a break cost can reach into the tens of thousands.

What triggers a break cost?

Most borrowers don't fix planning to break, but life changes. The common triggers are worth knowing before you lock in.

Action during the fixed termBreak cost risk
Refinancing to another lenderYes, on the remaining fixed balance
Selling the propertyYes, unless you port the loan
Large extra repayments above the capYes, on the amount over the limit
Switching to variable earlyYes, treated as breaking the fix
Staying put to the end of the termNo break cost
Break costs are largest when rates have fallen since you fixed. Always ask the lender for a written break-cost quote before you exit a fixed rate.

How do you avoid being trapped by a fixed rate?

Fix only the portion of the loan you're confident you'll hold for the full term, and consider a split so the variable portion keeps an offset and extra repayments. Check the lender's extra-repayment cap before you overpay a fixed loan. If you think you may sell or refinance within the term, the certainty of fixing has to be weighed against the risk of a break cost that can wipe out the benefit.

  • Break costs are largest when rates have fallen since you fixed.
  • Selling, refinancing, or overpaying can all trigger them.
  • A split loan keeps flexibility on the variable portion.
  • Ask for a written break-cost quote before exiting a fixed rate.
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Fixed-rate break-cost traps: frequently asked questions

What is a break cost on a fixed home loan?
A break cost is what a lender can charge if you exit a fixed rate before the term ends, whether by refinancing, selling, or making large extra repayments. It compensates the lender for the interest it expected to earn over the remaining fixed period. It is largest when market rates have fallen since you fixed, because the lender would now re-lend that money at a lower rate. On a large loan with years left to run, a break cost can reach into the tens of thousands.
What triggers a break cost?
Most borrowers don't fix planning to break, but life changes. The common triggers are worth knowing before you lock in.
How do you avoid being trapped by a fixed rate?
Fix only the portion of the loan you're confident you'll hold for the full term, and consider a split so the variable portion keeps an offset and extra repayments. Check the lender's extra-repayment cap before you overpay a fixed loan. If you think you may sell or refinance within the term, the certainty of fixing has to be weighed against the risk of a break cost that can wipe out the benefit. Key points: Break costs are largest when rates have fallen since you fixed.; Selling, refinancing, or overpaying can all trigger them.; A split loan keeps flexibility on the variable portion.; Ask for…

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