Norwich Union Investment Funds is warning investors to beware of non Cat-marked Isa funds.
It says 'ignoring the benefits of Cat standards could mean losing the performance race before it has even started'.
NUIF bases this comment on figures compiled by Fitzrovia for its NU Isa league. The league claims that on average investors would only have made money with a Cat standard equity fund in the main Isa sectors.
NUIF chief operating officer Stewart Cazier says: "Once again, the Isa league clearly shows that using performance as the sole criteria for investment choices is not a rational argument.
"It demonstrates the enormity of the task faced by non-Cat standard funds, to close the performance gap created by heavy first year and ongoing charges."