Interest Calculator

We may have told you to pay interest on top of – or as part of – a payment to your customer.

This calculator will help you work out what you may need to add to an award, using the Bank of England base rate plus one percentage point.

Learn more about the Financial Ombudsman’s approach to compensation

How to use the interest calculator

1. Enter the capital sum you wish interest to be applied to.
2. Add the start and end date for the period in question.
3. Use the ‘add new calculation period’ button to enter additional sums and time frames.
4. Use the ‘calculate’ button to see the result.
5. The calculator will give you:
   • the value of interest payable for each sum you enter
   • the total for all sums in a single calculation
   • the option of a detailed breakdown of the calculation – including the weighted average and formula – is available by using the information link, ‘How was this calculated?’
6. If a refund has been paid during the calculation period, you can:
   • either calculate interest on the initial capital sum up to the refund date, then on the new amount after deducting the refund, from the refund date
   • or work out interest on the full amount and on the refund separately, then subtract the refund’s interest from the total.

Legal disclaimer

This interest calculator is intended to support firms, inform consumers and promote consistency of application. Firms using the interest calculator to calculate an offer remain responsible for:

1. the accuracy of any interest payment they make, and
2. ensuring that their interest rate calculations accord with the terms of the redress awarded by the Financial Ombudsman Service Limited.

The Financial Ombudsman Service Limited accepts no liability for any calculation errors produced by the calculator.

Further support

If you're a financial business – or a professional representative of consumers – and you experience problems using this calculator, please:

• email business.support@financial-ombudsman.org.uk, or
• call 020 7964 1400

If you're a consumer, with a question about a financial award or the way it's been calculated, please contact the relevant business. They will be able to explain how they worked out the interest on the amount. If you can’t sort things out with the business, talk to your investigator and they will do their best to help.