withholding for self-employment tax on elective deferrals?

[Guest Kurt_Johansen]

Does a church plan need to withhold for self-employment tax with respect to elective deferrals under a 403(B) or 401(k) plan by dual status pastors (they are considered employees for purposes of income tax and plan participation but are considered self-employed for purposes of social security). If there is no withholding requirement, is the dual status pastor supposed to pay self-employment tax on the elective deferrals?

thanks for your help,

Kurt