A lower rate always looks like the better deal. Often it is. But the rate is only one part of what a mortgage costs you over its life, and chasing the sharpest number can quietly cost more than it saves.
What the headline rate hides
- Break costs — a very low fixed rate locks you in. If your plans change and you need to repay early or sell, the break fee can be substantial.
- Flexibility — fixed loans limit how much extra you can repay each year without penalty. If you expect lump sums, that restriction has a cost.
- Cash contributions — a lender offering a slightly higher rate but a cash contribution for taking the loan may leave you better off overall.
- Offset and revolving facilities — these can reduce the interest you pay by using your everyday savings against the loan, which a headline rate comparison ignores.
Structure is where the money is
Two borrowers with the same rate can pay very different amounts of interest over ten years depending on how the loan is set up: whether repayments were kept high after a rate drop, whether part of the loan was on floating for extra repayments, whether an offset account was used. These choices often outweigh a small difference in rate.
The right mortgage is the one that fits how you actually live — your income, your plans and how much certainty you want — not just the one with the smallest number on the page.
When the lowest rate is the right call
If your situation is stable, you have no plans to sell or make large lump-sum repayments, and the flexible features would go unused, then yes — take the lowest rate. The point is to make that choice on purpose, not by default.
This article is general information only and not personalised financial advice. Everyone's situation is different — get in touch for guidance specific to you.