Guide

How Monthly Interest Works.

Monthly interest examples can look simple, but the assumptions behind them matter. This guide explains the basic mechanics.

This information is not investment advice. IGI information is only intended for eligible recipients who can lawfully receive it.

Basics

Simple and compound interest

01

Simple monthly interest assumes the monthly amount is paid out or not added to the balance. Compound monthly interest assumes interest is added to the balance and then itself earns interest.

Examples

Illustrative monthly figures

02
  • GBP 5,000 at 1% monthly is GBP 50 before any fees, tax or adjustments.
  • GBP 20,000 at 1% monthly is GBP 200 before any fees, tax or adjustments.
  • GBP 50,000 at 2% monthly is GBP 1,000 before any fees, tax or adjustments.
Next step

Ready to continue?

Start with the eligibility flow before reviewing product-specific information or opening an account.

Check eligibility
IGI Logo
Simple monthly interest for eligible clients, tracked through the IGI platform.
Mobile Applications
Apple App StoreAndroid App Store
Regulatory information

IGI Limited is registered in England and Wales under company number 13141820. Our registered address is 20-22 Wenlock Road, London, England, N1 7GU.

IGI Ltd is not authorised and regulated by the FCA and we do not give investment advice, you should contact a regulated investment professional if you require investment advice.

Investment products are available to you on the basis that you are reasonably believed to be such a person as is described in Article 19 (Investment professionals), Article 48 (Certified high net worth individuals), Article 49 (High net worth companies, unincorporated associations, etc.) Article 50 (Sophisticated investors), Article 50A (Self-certified sophisticated investors) and Article 51 (Associations of high net worth or sophisticated investors) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, or you are a person to whom this information may otherwise lawfully be sent or viewed.

If you do not fall within such descriptions, then you should not act upon the information contained on this website.

Copyright © IGI Limited 2026.
All rights reserved.