Here is how the tax bracket rate changes look through 2010.

The immediate tax benefit created by the new 10 percent bracket will come in the form of a credit which will be distributed to most taxpayers by check before October 1, 2001.  New payroll withholding tables will be in effect for the last six months of 2001 which will have the effect of larger take home pay.
Savings in ensuing years will become more dramatic, with further rate reductions scheduled for higher tax brackets.  For example, a couple who this year earns $150,000 might reasonably expect a reduction in 2001 taxes of $950.  But in 2010, they could expect a savings of about $3,800.  This includes additional savings from new “marriage penalty” relief provisions.