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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   Everest Mortgage Services
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   Ella Hislop 
 
 
 
 Trustindex verifies that the original source of the review is Google.  John was great throughout the entire process - super informative, responsive, friendly and efficient! Would 100% recommend. We were first time buyers and he put us completely at ease and went the extra mile every time we had a question / needed some help.
  
 
 
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   Melissa Elston 
 
 
 
 Trustindex verifies that the original source of the review is Google.  John provided a five star service from start to finish. The whole process was very slick and extremely professional. Obtaining our mortgage was not a straight forward request due to being a new build property but John advised on what information we would require and spoke with all the right people to get our mortgage over the line. Will be using him again in the future.
  
 
 
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   Matt Pourzand 
 
 
 
 Trustindex verifies that the original source of the review is Google.  John was efficient, friendly, and a great communicator. He was very knowledgeable and handled our case with efficiency. John made the whole process much smoother than expected, and I would 100% recommend his service!
  
 
 
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   Simon Hedger Grace 
 
 
 
 Trustindex verifies that the original source of the review is Google.  John starts where others don’t: he properly listens. Then he’s like a dog with bone until the job is done. Highly recommended
  
 
 
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   Chloe Stringer 
 
 
 
 Trustindex verifies that the original source of the review is Google.  ⭐️⭐️⭐️⭐️⭐️
John was fantastic throughout the whole mortgage process. Professional, knowledgeable, and always happy to help. He made everything feel simple and stress-free. Would highly recommend John to anyone looking for a great mortgage broker!
  
 
 
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   Jordan Nicholls 
 
 
 
 Trustindex verifies that the original source of the review is Google.  Absolutely brilliant service from John from start to finish. As first-time buyers, the mortgage process could have been really stressful and confusing, but John made everything so straightforward and easy to understand.

He was always available to answer any questions we had, explained everything clearly, and kept us updated throughout the whole process. John worked hard to find us the right mortgage and has been incredibly helpful, professional and supportive every step of the way.

We genuinely couldn't have asked for a better mortgage advisor and would 100% recommend John to anyone looking for a mortgage. Thank you for all your help!
  
 
 
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   Kath Tonkyn 
 
 
 
 Trustindex verifies that the original source of the review is Google.  We have known John since we bought our first rental in 2009 and he has guided and helped us all the way. He laid out a plan for us that this month will be fulfilled exactly as he said it would. He has never let us down and he is always there when we have needed him. Nothing is too much trouble. Great guy and a  true proffessional. Thanks John for everything. You are truly the best.
  
 
 
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   Louise Holmes 
 
 
 
 Trustindex verifies that the original source of the review is Google.  We have used Johns services a few times now, when remortgaging. John is extremely knowledgeable and always strives to find the best deal that works for you. His communication is excellent, he’s very friendly and explains thoroughly the best way for you to go forwards and we would highly recommend his services.
  
 
 
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   Christina 
 
 
 
 Trustindex verifies that the original source of the review is Google.  I honestly don’t know how I would have got through buying my first house without John.

From the very beginning, he helped us work out what we could afford and get our Agreement in Principle sorted, but his help went way beyond just arranging the mortgage. While we were viewing houses, he was always happy to give his thoughts on whether an asking price seemed sensible and what we might want to offer. His experience and knowledge were incredibly valuable when we were trying to navigate something we knew very little about.

Once we found our house, John made the whole process so much easier. He was incredibly quick to respond, explained everything clearly and was always happy to answer my many questions!

What really impressed me was how much he handled himself. He dealt directly with the estate agent, solicitors and lender, meaning we weren’t constantly stuck in the middle passing messages around. If an issue came up, he’d often just sort it in the background and let us know there was an issue but it's resolved, rather than adding to our stress.

John genuinely cares about his clients and it really shows. He’s friendly, incredibly knowledgeable and always made us feel like we were in safe hands.

I couldn’t recommend him highly enough. Five stars doesn’t really do justice to how much he helped us!
  
 
 
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   Kyle McClorey 
 
 
 
 Trustindex verifies that the original source of the review is Google.  As a first-time buyer, I couldn’t have asked for a better mortgage broker than John. From our very first conversation, he was incredibly friendly and immediately put me at ease, making what initially felt like a daunting process feel straightforward and manageable.

John’s communication was outstanding throughout. No question was ever too big or too small, and he always took the time to explain everything clearly and thoroughly. Thanks to his support, I was able to navigate the entire mortgage process with complete confidence. I never once felt stressed or under pressure, which made such a difference as a first-time buyer.

His knowledge and expertise are second to none, and he was able to secure me a fantastic mortgage deal. I genuinely felt that he had my best interests at heart every step of the way.

I can’t recommend John highly enough. If you’re looking for someone who is knowledgeable, approachable, and truly dedicated to helping their clients, he’s the person to go to. Thank you, John, for making such an important milestone such a positive experience!

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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