ISA

The UK Now Has £1 Trillion in ISAs. Here Is Where It All Is.

HMRC and AJ Bell data for September 2026 puts the UK ISA market at £951.9bn. Cash ISA inflows up 37.5% to £95.6bn. Stocks and shares ISA inflows up 19.6% to £37.2bn across 4.9m accounts. 40% of UK adults hold an ISA. Where you probably sit, and the one specific action before 5 April 2027.