Project your ISA savings
Selected tax-year ISA rules
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This check applies only to the selected tax year. It does not predict future allowances or determine eligibility, ISA type restrictions, transfers, Lifetime ISA withdrawal conditions, or subscriptions reported by other providers.
Year-by-year projection
| Year | Contributions made | Growth earned | End-of-year balance |
|---|---|---|---|
| Enter valid assumptions to see the projection. | |||
How to use the UK ISA Savings Calculator
Project tax-efficient ISA savings growth from a balance, contributions and return assumptions.
Enter your details
Enter the amounts, rates and periods that describe your scenario.
Check the assumptions
Review every input before relying on the estimate.
Compare the result
Use the result as a planning estimate and test alternative scenarios.
Frequently Asked Questions
What does the UK ISA Savings Calculator calculate?
It provides an illustrative estimate from the assumptions entered.
Are the results guaranteed?
No. Actual outcomes, tax rules, rates and charges can differ.
Can I change the assumptions?
Yes. Adjust the inputs to compare your own scenario.
Does this replace professional advice?
No. Seek qualified advice for decisions specific to your circumstances.
Are tax rules included?
The tool uses simplified assumptions and may not cover every relief or exception.
Why might results vary?
Providers and official calculations can use different dates, rounding and criteria.
Is my information stored?
No. Calculations run locally in your browser.