
From 6 April 2027 a flat 22% charge applies to interest earned on uninvested cash held inside a stocks and shares ISA or innovative finance ISA. It closes the workaround of using an investment ISA as a tax-free cash account, and it sits alongside the £12,000 cash ISA cap as the second anti-circumvention rule in…

From 6 April 2027, under-65s’ Cash ISA limit drops from £20,000 to £12,000. The triple-whammy timeline, the cost of doing nothing, and the 6-move strategy for the rest of the 2026/27 tax year.
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