问个和税有关的问题。。。

今天美国众议院通过了减税计划延期(http://money.cnn.com/2006/12/08/pf/taxes/tax_extenders_housedpasses/index.htm?postversion=2006120817)

其中有一段是：

State and local sales tax deduction
The extension would give taxpayers the option on their federal return of deducting either what they paid in state and local income tax or what they paid in state and local sales taxes, whichever is higher.

This provision, which was in effect for tax years 2004 and 2005, has been of greatest advantage to taxpayers who live in the handful of states that don't impose an income tax and to those who live in states with high sales taxes and relatively low income taxes.

哪位给说说这个计划如何对无州税地区的百姓有利了，我咋看不出来呢？

谢了。。。