Understanding Offset Mortgages: A Comprehensive Guide

Offset mortgages allow a mortgage borrower to offset savings against their mortgage balance. Interest is only charged on the net balance (mortgage balance minus the savings balance).

Offset mortgages typically carry higher interest rates than a standard mortgage but significant savings can be made if utilised properly. 

Offset mortgages are particularly attractive to clients with large savings balances including the self-employed who will typically put aside their tax in a savings account.

The Basics of Offset Mortgages

Open Close
  1. The Offset Mechanism:

At its core, an offset mortgage is a simple concept. Instead of earning interest on your savings separately from paying interest on your mortgage, these two financial aspects are combined. Your savings act as a buffer against your mortgage debt, and the interest you owe is calculated on the net balance.


  1. How It Works:

Let’s say you have a mortgage of £200,000 and savings of £30,000. With an offset mortgage, you only pay interest on the £170,000 (£200,000 – £30,000). This can result in substantial interest savings over the life of the loan.


Advantages of Offset Mortgages

Open Close
  1. Interest Savings:

The primary advantage of offset mortgages is the potential for significant interest savings. By reducing the outstanding mortgage balance on which interest is calculated, homeowners can pay off their mortgage faster and save money in interest payments.


  1. Flexibility:

Offset mortgages offer flexibility. You can access your savings at any time without penalty, making it an attractive option for those who want to maintain liquidity while still benefiting from interest offset.


  1. Tax Efficiency:

Some interest earned on savings is taxable. An offset mortgage can provide a tax-efficient way to manage savings, potentially reducing your tax liability. You should seek advice from a tax specialist in this regard. 


Considerations and Drawbacks

Open Close
  1. Higher Initial Costs:

Offset mortgages might have slightly higher interest rates or fees compared to traditional mortgages. However, the long-term savings may outweigh the initial costs, depending on individual circumstances.


  1. Savings Yield vs. Mortgage Interest Rate:

To maximise the benefits of an offset mortgage, it’s essential to have significant savings. If the interest earned on savings is lower than the mortgage interest rate, the offset advantage diminishes.


  1. Complexity:

Some borrowers might find offset mortgages more complex than traditional mortgages. Understanding how the offset mechanism works and managing multiple accounts could be challenging for some individuals.


Is an Offset Mortgage Right for You?

Open Close

Deciding whether an offset mortgage is suitable for your situation involves considering various factors:

Financial Discipline: An offset mortgage can be especially advantageous for those with disciplined savings habits.

Interest Rate Differential: Analyse the interest rates on your mortgage and savings. The bigger the difference, the more you stand to gain from an offset arrangement.

Liquidity Needs: If you anticipate needing access to your savings regularly, the flexibility of an offset mortgage may align well with your financial goals.

Tax Implications: Consult with a tax specialist to understand the tax implications of an offset mortgage.



Offset mortgages can be a powerful tool for homeowners seeking a flexible and efficient way to manage their finances. While they may not be suitable for everyone, those with significant savings and a strategic approach to financial management can benefit from reduced interest payments and accelerated mortgage repayment. As with any financial decision, thorough research and consultation with financial professionals are crucial to making an informed choice that aligns with your unique circumstances and goals.

Using A mortgage broker to compare offset mortgages.

As a mortgage broker, we will look at lenders across the market to compare offset mortgages and find the best offset mortgage for your situation. Some lenders offer fixed-rate offset mortgages whilst others will track the Bank of England base rate. Lenders can offer both repayment and interest-only offset mortgages. 


Which lenders offer offset mortgages?

Not all lenders in the UK offer offset mortgages. A handful of banks and building societies provide offset mortgages. Using a mortgage broker will ensure you receive the best advice when selecting an offset mortgage provider.

Does an offset mortgage reduce my payments or the term?

An offset mortgage can work in one of two ways. The savings balance can be offset to reduce your monthly payment. Choosing this option will not affect the mortgage term. The second option is to keep your payments the same but reduce your capital balance, hence reducing the term of the mortgage. 

Can you have a fixed rate of interest on an offset mortgage?

Some, but not all, mortgage lenders offer fixed-rate offset mortgages. 

To discuss offset mortgages with one of our advisors please do get in touch.


We won’t bombard you with mortgage jargon. Use our guide to the most common mortgage terms.

Common Mortgage Terms Read Our Guide To Mortgages

A mortgage is a loan secured against your home or property. Your home or property may be repossessed if you do not keep up repayments on your mortgage or any other debt secured on it.


If you are thinking about getting an Offset Mortgage and wish to work with an award-winning mortgage broker, then get in touch. You can reach us on email enquiry@foxdavidson.co.uk or give us a call. We are also on Facebook, Twitter and Instagram.