there becomes effective a material adverse change in the information set forth in such disclosure statement or a material change in the governing instrument to be used in establishing the account, annuity, or contract, the trustee or issuer shall furnish, or cause to be furnished, to the benefited individual such amendments to any previously furnished disclosure statement or governing instrument as may be necessary to adequately inform the benefited individual of such change. The trustee or issuer shall be treated as satisfying this subdivision (ii)(B) of this subparagraph only if material required to be furnished by this subdivision is received by the benefited individual at least seven days preceding the earlier of the date of establishment or purchase of the account, annuity, or endowment contract or if the benefited individual is permitted to revoke the account, annuity, or endowment contract on or before a date not less than seven days after the date on which such material is received, pursuant to a procedure for revocation otherwise satisfying the provisions of subdivision (ii)(A)(2) of this subparagraph.
Thus, for example, if an employer establishes a trust described in section 408(c) for the benefit of employees, and the trustee furnishes an employee with a disclosure statement and a copy of the governing instrument (as required by this subparagraph) on the date such employee's interest in the trust commences, such employee must be given a right to revoke such interest within a period of at least seven days. If any contribution has been made within such period (whether by the employee or by the employer), the full amount of such contribution must be paid to such employee pursuant to subdivision (ii)(A)(2) of this subparagraph.
To the extent that information on the matters described in subdivisions (iii) (A) and (B) of this subparagraph is provided in a publication of the Internal Revenue Service relating to individual retirement savings arrangements, such publication may be furnished by the trustee or issuer in lieu of providing information relating to such matters in a disclosure statement.
26 C.F.R. §1.408-6