CIS has called upon the Government not to give group personal pension plans an exemption under stakeholder proposals.
It claims this will render the proposals a damp squid.
The life office says it is not satisfied there is any rational basis for allowing GPPs an exemption.
Because GPPs have non-occupational status CIS claims they are not likely to meet the charging constraints set out under stakeholder.
Its general manager marketing Martin Clarke says: "If GPPs are allowed exemptions on the bases proposed, we believe the Government will fail in its aims to control charges and simplify pension provision.
"The previous consultation document highlighted the Government's aim to make stakeholder pensions highly transparent in terms of features and charges but allowing such exemptions would simply undermine this aim."