This plugin lets you change automatically your customers' shopper group. This can be useful e.g. if you need different calculation & tax rules for anonymous visitors and customers who perform a guest checkout.

Features:

    automatically assign a specified shopper group or
    let the customers select a shoppergroup during checkout or
    assign a specified shopper group upon filling in a certain shopper field
    assign a specified shopper group upon entering a valid VATID (requires plugin BIT Check VATID for Virtuemart)
    handling of guests and registered customers
    select different groups for guests and registered customers