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United Kingdom Investments Calculators

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

SI 2026/1018 takes effect on 6 April 2027: a saver aged 64 or under at tax-year end may subscribe up to £12,000 to cash ISAs within the £20,000 overall annual ISA allowance. The remaining £8,000 can go into a non-cash ISA, stay unused, or be saved outside an ISA; investing is optional. The impact calculator models one response only: a fixed monthly cash-saving stream of up to £20,000 a year, with the part above the applicable annual cash cap held in a taxable account. It applies the available Personal Savings Allowance and the enacted 2027-28 savings tax rates to that outside interest.

Available calculators

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Cash ISA 2027 Cap Impact Calculator

Estimate the effect of the enacted £12,000 annual Cash ISA cap from April 2027 for savers aged 64 or under at tax-year end, against a £20,000 cash-ISA counterfactual.

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Government-Sourced DataAll calculators built from official regulatory sources by Galvin Mendonca, Software Engineer & Founder
Source links and illustrative assumptions appear on this page. Last reviewed July 2026.

Frequently Asked Questions

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