UK ISA Calculator
Calculate ISA (Individual Savings Account) growth with tax-free returns and government bonuses.
Calculate
Annual ISA allowance: £20,000
Cash ISA: 4-5%, Stocks & Shares ISA: 5-8% average
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Enter your investment details to see how your ISA could grow over time.
📖 What is an ISA?
An Individual Savings Account (ISA) is a 'wrapper' that protects your savings and investments from UK tax. Any interest, capital gains, or dividends earned within an ISA are completely tax-free.
No Income Tax
Interest and dividends are tax-free
No Capital Gains Tax
Keep all your investment profits
Flexible Access
Withdraw money when you need it
📋 Types of ISAs
Cash ISA
Save with tax-free interest. Low risk, easy access.
Allowance: £20,000
Stocks & Shares ISA
Invest in funds, shares & bonds. Higher potential returns.
Allowance: £20,000
Lifetime ISA
25% bonus for first home or retirement (18-39 only).
Allowance: £4,000
Junior ISA
Save tax-free for children under 18.
Allowance: £9,000
📅 ISA Allowances 2024/25
Total ISA
£20,000
Lifetime ISA
£4,000
Junior ISA
£9,000
Tax Year
6 Apr - 5 Apr
✨ Key Benefits of ISA Savings
All interest earned is completely tax-free forever
No need to declare ISA income on your tax return
Flexible ISAs let you withdraw and replace money in the same tax year
Can transfer between ISA providers without losing tax benefits
Frequently Asked Questions
How much can I save in an ISA?
For the 2024/25 tax year, the total ISA allowance is £20,000. This can be split across different types of ISAs, but you can only pay into one of each type per tax year.
Can I have multiple ISAs?
Yes, you can open one of each type of ISA (Cash, Stocks & Shares, Lifetime, Junior) in a single tax year, but your total contributions must not exceed the overall annual ISA allowance (£20,000 for 2024/25).
Can I withdraw money from my ISA?
Yes, you can usually withdraw money from your ISA whenever you need to. If you have a 'Flexible ISA', you can withdraw and replace money in the same tax year without it counting towards your annual allowance. However, Lifetime ISAs have specific withdrawal rules and penalties if not used for a first home or retirement.
What happens to unused ISA allowance?
Unused ISA allowance cannot be carried forward. The allowance resets each tax year on 6th April, so use it or lose it!