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ISA tax calculator

Would a Stocks & Shares ISA actually save you tax on a lump sum? A quick, plain-English estimate - free, no sign-up, education only.

The UK tax shelter

Would an ISA actually save you tax?

A Stocks & Shares ISA shelters your investments from UK tax on dividends and gains. Here's a rough idea of what that's worth on a lump sum, versus a normal (‘taxed’) account. Illustrative only - 2025/26 allowances, not advice.

Amount
£
Years held
Dividend yield
%
Growth a year
%
Your tax band

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