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United Kingdom Investments Calculators

Free, localized investments planning tools updated for the 2026 financial year in United Kingdom.

The Cash ISA rules change in April 2027: savers under 65 will have their cash ISA allowance capped at £12,000 of the overall £20,000, with the balance available only through investment ISAs. The impact calculator prices what that squeeze means for your long-term wealth under different responses, keep cash outside the wrapper and pay tax via the shrunken Personal Savings Allowance, or move the squeezed £8,000 into a stocks and shares ISA, using your actual balances and horizon.

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Cash ISA 2027 Cap Impact Calculator

Calculate the long-term wealth loss of the new £12,000 Cash ISA cap for under-65s compared to the legacy £20,000 limit.

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Government-Sourced DataAll calculators built from official regulatory sources by Galvin Mendonca, Finance Researcher
All figures from primary government sources. Last updated July 2026.

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