Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what information her Department holds on the total value of investments in (a) cash, (b) stocks and shares, (c) innovative finance and (d) lifetime ISAs in each of the past five tax years, broken down by investors' income bracket.

Information on the total value of ISA subscriptions, the total market value of ISAs, and the number of ISA holders and subscribers broken down by income bands is available in HMRC’s Annual Savings Statistics.

https://www.gov.uk/government/collections/annual-savings-statistics