While the generation-skipping transfer (GST) tax is complex, most estate practitioners who regularly deal with it eventually obtain a level of comfort, if not an expertise, concerning it. Such practitioners counsel their clients about avoiding or minimizing exposure to the tax. Some of the typical tools in the arsenal involve the GST tax annual exclusion and the GST tax lifetime exemption. For the old trusts, the issue becomes whether the trust is "grandfathered" from the tax.