Average subscription in ISAs in the United Kingdom 2018, by type

* Figures only include adult ISA's and therefore do not contain savings of individuals under 18 years of age.

The source added the following information "Prior to April 2008 the overall ISA limit was £7,000 with the cash limit being set at £3,000. From April 2008 these limits were raised to £7,200 and £3,600 respectively. And from October 2009, for those aged 50 or over, the overall subscription limit was increase to £10,200, of which £5,100 could be invested in a cash ISA. These higher limits applied to all age groups in 2010-11. Stocks & shares and cash subscription limits of £10,680 and £5,340 respectively applied in 2011-12. Stocks & shares and cash subscription limits of £11,280 and £5,640 respectively applied in 2012-13. Stocks & shares and cash subscription limits of £11,520 and £5,760 respectively applied in 2013-14."

* For the tax year starting 6th April 2014 but prior to 1st July 2014, the stocks and shares limit was £11,880 and the cash limit was £5,940. From 1st July 2014, all ISAs became New ISAs (NISAs). The annual subscription limit was increased to £15,000, which can be subscribed in cash, stocks and shares, or any combination of the two. For 2015-16 and 2016-17, the annual limit was £15,240

** From 6 April 2016 the Innovative Finance ISA was introduced, allowing interest and gains from peer to peer loans to qualify for tax advantages.
*** Figures are provisional.
**** 2017-18 is the first year for which Lifetime ISAs were available. The annual subscription limit for Lifetime ISAs is £4,000, although those with Help to Buy ISAs could transfer in their account balance without affecting their annual subscription limit up until 5 April 2018. The government provides a 25% bonus on this amount, which is not reported in these statistics.