Compound Interest Formula:
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The Money Saving Expert UK Savings ISA is a tax-free individual savings account available to UK residents. As of September 2025, these accounts offer up to 4.38% tax-free interest according to Money Saving Expert recommendations, helping savers maximize their returns while protecting their earnings from taxation.
The calculator uses the compound interest formula:
Where:
Explanation: The formula calculates how your initial investment grows over time with compound interest, where interest is earned on both the principal and previously accumulated interest.
Details: ISAs provide a tax-efficient way to save money in the UK. Any interest earned is completely tax-free, which can significantly boost your savings over time compared to taxable accounts. The compound effect means your money grows faster the longer you leave it invested.
Tips: Enter your initial deposit in GBP, the annual interest rate (up to 4.38% as of September 2025), select how often interest is compounded, and specify the time period in years. All values must be positive numbers.
Q1: What is the current ISA allowance?
A: For the 2025/26 tax year, the annual ISA allowance is £20,000 per individual, which can be spread across different types of ISAs.
Q2: Are there different types of ISAs?
A: Yes, there are Cash ISAs, Stocks and Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs, each with different features and rules.
Q3: Can I withdraw money from my ISA?
A: Yes, you can withdraw from a Cash ISA at any time, but this may affect your annual allowance if you want to reinvest.
Q4: Is my money safe in an ISA?
A: Cash ISAs are covered by the Financial Services Compensation Scheme (FSCS) up to £85,000 per person, per institution.
Q5: Can I transfer ISAs between providers?
A: Yes, you can transfer your ISA to a different provider, but you should do this through the proper transfer process to maintain the tax-free status.