Offset mortgage calculator
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Offset mortgage vs savings
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Compare if it's better to keep your savings in a high-interest account or use them to offset your mortgage.
How our offset mortgage calculator works
Our offset mortgage calculator lets you compare two options side by side: keeping your savings in a high-interest account or using them to offset your mortgage balance. Just enter your mortgage size, remaining term, savings amount and interest rates for both a standard and offset deal, and the calculator does the rest. Within seconds, you will see exactly which option leaves you better off and by how much.
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What is an offset mortgage?
An offset mortgage links your savings to your mortgage balance. Instead of earning interest on your savings separately, your savings are used to reduce the mortgage balance that interest is charged on. For example, if you have a mortgage of £300,000 and £50,000 in savings, you would only pay interest on £250,000. Your savings stay in your account and you can still access them, but while they sit there, they are working to lower your monthly interest charges.
This can be a smart option if you have a decent amount of savings but do not want to lock them away or use them to overpay your mortgage directly. You keep the flexibility of having cash available while still reducing what you pay each month.
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When does offsetting make sense?
An offset mortgage is not the right fit for everyone. It tends to work best if you are a higher or additional rate taxpayer, because you would normally lose a larger chunk of your savings interest to tax. By offsetting instead of earning taxable interest, you effectively get a better return. It can also suit self-employed borrowers who keep cash reserves in their business or personal accounts and want that money to do more without giving up access to it.
On the other hand, if your savings are small relative to your mortgage, the benefit may be minimal. That is exactly why we built this offset mortgage calculator, so you can see the real numbers before making a decision rather than guessing.
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Not sure which option suits you?
The calculator gives you a clear starting point, but there is more to consider than the numbers alone. Offset mortgage rates are sometimes slightly higher than standard deals, and the fees can differ too. Whether offsetting is genuinely worth it depends on your full financial picture, your savings habits, your tax position and how long you plan to stay on the deal.
If you want to talk it through properly, get in touch. We will run through your options, explain the trade-offs in plain English and help you work out whether an offset mortgage is the right move. Call us on 01273 007740 or book a free consultation to get started.
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