Thousands of investors were positioned "within touching distance" of attaining ISA millionaire status in 2023, according to recent analysis from the money management application Plum. This development suggests a significant expansion of the exclusive group of savers who have accumulated over one million pounds within their Individual Savings Accounts.
Official HMRC Figures Reveal Substantial ISA Wealth
Following a freedom of information request submitted to HM Revenue and Customs, Plum obtained detailed data regarding high-value ISA holdings. The official statistics indicate that approximately 5,070 individuals possessed ISA portfolios valued at one million pounds or more by April 2023.
Thousands More Approaching the Seven-Figure Threshold
The HMRC response to Plum's inquiry provided further granularity, revealing that during the 2022-23 tax year, 1,240 ISA holders maintained balances between £950,000 and £999,999. An additional 1,530 investors held pots valued from £900,000 to £949,999. Furthermore, a substantial cohort of 4,700 savers had ISA funds ranging from £800,000 to £899,999.
Plum analysts emphasize that due to the inherent lag in official reporting and sustained stock market appreciation in recent years, a considerable number of these high-value accounts have likely already breached the million-pound milestone. This would significantly augment the existing count of over 5,000 ISA millionaires documented in 2023.
Broader Landscape of High-Value ISA Savings
Delving deeper into the HMRC dataset, Plum identified that nearly 60,000 ISA holders—specifically 59,970 individuals—were managing portfolios worth between £500,000 and £999,999 during the same 2022-23 period. The financial application projects that, assuming continued investment and the realization of compounded growth, many within this group could realistically join "millionaires' row" within the coming decade.
Expert Commentary on the Democratization of Wealth Building
Rajan Lakhani, a representative from Plum, reflected on the transformative potential of the ISA scheme, stating, "Few people could ever have imagined that when the ISA launched, it would one day be creating tens of thousands of millionaires."
This perspective is echoed by Maike Currie, Vice President of Personal Finance at PensionBee, who highlighted the strategic power of systematic investing. "What these figures tell us is the power of compounding and the importance of control – you can’t plan to win the Lottery, but you can plan to invest," Currie explained.
She elaborated on the accessibility of this wealth-building pathway, noting, "Not everyone will win the Lotto – most won’t. Likewise, not everyone will be born into wealth, marry it or receive a life-changing inheritance. But investing is within the reach of ordinary earners and ISAs are one of the most powerful tools we have to democratise that opportunity."
With the conclusion of the tax year approaching, Currie issued a timely reminder to savers: "As the end of the tax year approaches, it’s a timely reminder to use your annual ISA and pension allowances. You don’t need luck – you need time, discipline and the decision to start."
Contextual Comparison with Alternative Wealth Sources
The rise of ISA millionaires presents a striking contrast to other traditional avenues for accruing substantial wealth. For instance, figures released in December by National Lottery operators indicated that since its inception in 1994, the lottery has created more than 7,700 millionaires, including 365 new millionaires in 2025 alone. This comparison underscores the predictable, disciplined approach of investment versus the chance-based nature of lotteries.
The accumulating data underscores a significant financial trend: through consistent investment, utilization of tax-efficient wrappers like ISAs, and the formidable force of compound returns, achieving millionaire status is becoming an increasingly attainable goal for a growing segment of the UK's investing public.
