Offset mortgages explained: How they work and who they’re for

In some circumstances, an offset mortgage could reduce the amount of interest you pay and help you be mortgage-free sooner.

Offset mortgages make up a small portion of total outstanding mortgages. Indeed, according to the Financial Conduct Authority (30 July 2025), just 1.7% of mortgages in 2024 were offset. Yet, if you’ve overlooked them, you might have missed an opportunity to reduce the cost of borrowing.

An offset mortgage uses your savings to reduce the interest paid

An offset mortgage links your mortgage with a savings account. You’d only pay interest on the difference between the two, which could save you money.

For example, if you have a £200,000 mortgage and £50,000 placed in the linked savings account, you’d only pay interest on £150,000. As a result, you could benefit from lower repayments or pay off your mortgage more quickly.

An offset mortgage may seem like an obvious option when you’re searching for a mortgage, but there are some potential drawbacks to consider.

Key disadvantages for some people are that their savings won’t earn interest, and the mortgage interest rate may be higher than a standard mortgage. So, it’s important to understand whether it would be appropriate for your circumstances before proceeding, as a traditional mortgage might be more suitable.

In addition, to get the most out of an offset mortgage, you need to leave your savings in the account. If you might dip into your savings, it could negate the expected benefits.

When does an offset mortgage make sense?

There are several scenarios where an offset mortgage could be valuable, including these.

People with significant savings

The larger the sum in the linked savings account, the more you could benefit from an offset mortgage. As a result, those with significant savings might want to consider an offset mortgage. It could provide a way to reduce your outgoings while retaining access to the cash in an emergency.

For example, if you’ve saved an inheritance, an offset mortgage could be a way for it to support your finances while you decide how you want to use it.

Freelancers or self-employed workers who save for their tax bill throughout the year might also find it valuable to hold this money in a savings account linked to their mortgage.

Higher- or additional-rate taxpayers

While your savings not earning interest is a drawback for some, it could help higher- and additional-rate taxpayers effectively manage their tax liability.

The interest paid on savings not held in a tax-efficient wrapper, such as an ISA, could become liable for Income Tax if the total amount exceeds the Personal Savings Allowance (PSA). In 2026/27, the PSA for basic-rate taxpayers is £1,000. However, this falls to £500 for higher-rate taxpayers, and additional-rate taxpayers do not have a PSA.

So, some higher- and additional-rate taxpayers could be better off financially if they forgo interest on their savings in favour of reducing the interest added to their mortgage.

Individuals with irregular incomes

Offset mortgages offer greater flexibility than traditional mortgages. As a result, they could be useful for individuals with irregular incomes, as you could manage cashflow fluctuations.

For instance, during months when your income is low, you might withdraw from your savings to cover your day-to-day costs. During a good month, you may deposit a larger amount to offset your interest repayments.

When your family want to offer financial support

You might also consider an offset mortgage if your family want to support you, but cannot pass on a lump sum as a gift.

For example, an offset mortgage may be useful if your parents have a lump sum that’s earmarked for their retirement in ten years. Gifting you this money could affect their long-term plans, but placing the money in the savings account linked to your mortgage until they need it could reduce your costs.

Some lenders now offer family offset mortgages, which could help first-time buyers get on the property ladder. Your family member’s money would be locked away for a defined period, during which they may receive interest. This could allow you to secure a mortgage with a smaller or no deposit.

Contact us to discuss your mortgage

We could help you understand the different mortgage options and determine which one might be suitable for your circumstances.

Please note: This article is for general information only and does not constitute advice. The information is aimed at individuals only.

All information is correct at the time of writing and is subject to change in the future.

Please do not act based on anything you might read in this article. All contents are based on our understanding of HMRC legislation, which is subject to change.

Your home may be repossessed if you do not keep up repayments on a mortgage or other loans secured on it.