Overview
- HMRC records confirm 5,070 ISA accounts held at least £1 million as of April 5, 2023.
- The FOI breakdown shows 1,240 accounts at £950,000–£999,999, 1,530 at £900,000–£949,999, and 4,700 at £800,000–£899,999, with 59,970 between £500,000 and £999,999.
- Plum and multiple outlets report that stock market gains since the snapshot likely pushed many near‑threshold portfolios over £1 million.
- Plum projects around 40,000 ISA millionaires within ten years, contingent on continued investing and assumed compound returns.
- Coverage contrasts the rise of ISA pots with National Lottery figures showing about 7,700 millionaires since 1994.