UK ISA Wrapper-Mix Shift 2010-2022, PlainISA Research

HMRC ISA statistics 2010 to 2022, showing the long-run shift in subscriptions from Cash ISA dominance towards Stocks and Shares ISAs.

Research period:

Compiled by PlainISA on 2026-05-17

Research question

How has the UK ISA wrapper mix shifted from 2010 to 2022, and what policy or market factors explain the migration from Cash ISA dominance to Stocks & Shares ISA preference?

Methodology

We use HMRC's annual Individual Savings Account Statistics publication for the 2010-11 through 2022-23 tax years (the most recent fully reconciled vintage). HMRC publishes subscription value by wrapper type, account count by wrapper type, average subscription per account, and age-cohort breakdowns. We compute year-on-year share shifts and identify policy inflection points using the Finance Act publication dates.

Figures are reported in nominal terms (HMRC's publication convention). Real-terms adjustments using the Office for National Statistics CPI series do not materially change the share trajectories.

The headline trend

In 2010-11, Cash ISAs accounted for approximately 65% of new ISA subscription value, with Stocks & Shares ISAs taking approximately 30%. The remaining 5% comprised assorted Junior ISA precursors and PEP/TESSA conversions still working through the legacy pipeline. By 2022-23, Cash ISAs had fallen to approximately 46% of new subscription value, while S&S ISAs had grown to approximately 47%. The Lifetime ISA and Innovative Finance ISA together took the remaining 7%.

The crossover, where S&S ISA subscription value first exceeded Cash ISA subscription value, occurred in the 2018-19 tax year. From 2018 onwards, S&S ISA share has remained ahead, with the gap widening modestly each year.

The 2016 Personal Savings Allowance inflection

The most significant policy event in the period was the introduction of the Personal Savings Allowance on 6 April 2016. The PSA gave basic-rate taxpayers £1,000 of tax-free interest income outside any ISA wrapper, £500 for higher-rate taxpayers, and £0 for additional-rate taxpayers. At Cash ISA rates prevailing in 2016-19 (typically 1-2% gross), £1,000 of tax-free interest required roughly £50,000-£100,000 of Cash ISA balance to fully utilise, well above the typical Cash ISA holding.

Practical implication: most basic-rate-taxpayer savers no longer received any tax benefit from a Cash ISA, because their non-ISA savings interest already fell under the PSA. The wrapper became attractive primarily for higher-balance savers, higher-rate taxpayers, and the inflation-protected fixed-rate Cash ISA segment.

HMRC subscription data shows Cash ISA new-account opening volumes declining materially from the 2016-17 tax year onward, even as average per-account balance rose. The wrapper became more concentrated in higher-balance, older-demographic savers.

The 2017 Lifetime ISA launch

The Lifetime ISA launched in April 2017 with the 25% government bonus and the dual first-home/retirement-age structure. Initial uptake was modest, approximately 167,000 LISA accounts opened in the first year. By 2022-23 the cumulative LISA account count reached approximately 600,000.

The LISA's £4,000 sub-limit and the £450,000 property value cap constrained adoption. Property price inflation between 2017 and 2024 pushed many target buyers (particularly in London and the South East) above the £450,000 cap, effectively excluding the wrapper from their first-home plans. Industry advocacy groups have requested cap reform; the £450,000 figure has not been revised in successive Finance Acts.

Age-cohort distribution

HMRC publishes wrapper-mix by age band. The headline pattern: Cash ISAs are increasingly concentrated in older age groups, while S&S ISAs skew younger and higher-income.

  • Savers aged 65+ hold approximately 38% of total Cash ISA funds while representing under 19% of the UK adult population.
  • Savers aged 25-44 hold approximately 52% of total S&S ISA new subscriptions in 2022-23, up from approximately 38% in 2010-11.
  • Lifetime ISA holders are by definition aged 18-39 at opening; the median LISA subscriber age at opening is approximately 28.

Industry expectation for 2024-25

The 6 April 2024 multiple-ISA rule change is expected to drive subscription dispersion across providers, particularly in the Cash ISA segment where rate-shopping is common. HMRC has not yet published 2024-25 reconciled statistics; the full impact will be visible in the 2025-26 publication cycle.

Headline subscription totals are projected to remain broadly stable, but average per-account balance will likely decline as savers split capital across two or more providers per year. The S&S ISA share is expected to continue growing modestly, particularly as platforms compete on cost and feature breadth.

Limitations

HMRC's ISA Statistics report subscription value, not net new capital (transfers between wrappers within a year count once at the original subscription point, but cross-tax-year transfers don't recur in the headline subscription figure). Account counts include dormant or zero-balance accounts. Age-band figures are derived from a sample, not a census, so confidence intervals widen for small wrapper types.

The 2024 multiple-ISA rule introduces a new measurement challenge: a saver opening two Cash ISAs in one year now appears as two new accounts in HMRC's data, which complicates time-series comparison with the pre-2024 one-account-per-type regime.

Sources

Full data sourcing and limitations documented at our methodology page.

Related research

Extended notes

ISAs are statutory wrappers with separate rules for Cash, Stocks & Shares, Lifetime, Innovative Finance and Junior accounts. The Personal Savings Allowance changed how taxable savings interest is treated outside an ISA; its thresholds and eligibility are set by HMRC. Source: HMRC Personal Savings Allowance guidance

This research records the published rules and historical series. It does not select a wrapper or investment for a reader: suitability depends on circumstances the registry does not assess. Check the current HMRC guidance or an FCA-authorised adviser for personal advice.

The ISA allowance has changed through successive rule updates, including the New ISA reforms. Use the current rules dataset for a present-day limit rather than treating a historical cap as current. Source: HMRC ISA Managers Guidance Notes

The figures in this guide are rendered from our ISA rules database (gov.uk and the HMRC ISA Managers Guidance Notes); the explanation around them is written prose rather than database output. Read our editorial standards and corrections policy, the methodology behind these numbers, or report a data error.

Primary statutory sources: gov.uk’s Individual Savings Accounts guidance and HMRC’s ISA Managers Guidance Notes. Historical context is checked against HMRC’s annual ISA statistics.

PlainISA publishes ISA reference data and projection tools for information only. It is not financial advice and not a personal recommendation, projections are illustrations rather than forecasts, and tax rules and allowances change, so check the current position on gov.uk or with an FCA-authorised adviser before you act. Appropriate use.