Investment IFA Hargreaves Lansdown is advising clients to put off investing in an ISA until at least one month after the official April 6 launch date.
It says it has watched with "abhorrence" the attempts to lure investors into a commitment to an ISA using incentives and pre-marketing.
The IFA is very concerned that with only twenty players currently offering ISA products only 2 or 3 per cent of the eventual market may be currently available.
Hargreaves Lansdown managing diretor Peter Hargreaves says: "It is only by firm condemnation from brokers that the last Pep season will not become a fiasco with the waters well and truly muddied by bribing investors into buying ISAs from a very restricted range."
Hargreaves is also concerned that with Jupiter and HSBC recently throwing their hats into the ring, other major players will also be encouraged to reveal plans, confusing investors still further.