Is there a way to combine these into one IF statement? I need to reference
the state and the date to determine the percentage to apply to the
calculation. For example, if the state is GA and the date is between
20030501 and 20040430 apply 4%, if the state is AL and the date is between
20050501 and 20060430, apply 3.5% etc.

These are the formulas and states (I6 is the date being referenced)

AL =IF(I6=20070501,0.006,IF(I6=20060501<=20070430,0 .005,IF(I6=20040501<=20060430,0.007,IF(I6=200205 01<=20040430,0.009,0))))
DC =IF(I6=20070501,0.111,0)
GA =IF(I6=20060501<=20070430,0.088,
IF(I6=20040501<20060430,0.116,IF(I6=20020501<=20 040430,0.081,0)))
ID =IF(I6=20040501<=20060430,0.033,IF(I6=20060501,0 .031,0))
KS =IF(I6=20070501,0.034,IF(I6=20060501<=20070430,0 .035,IF(I6=20040501<=20060430,0.032,IF(I6=200205 01<=20040430,0.04,0.094))))
MN =IF(I6=20010501<=20020430,0.162,IF(I6=20020501<= 20030430,0.107,0))
SC =IF(I6=20070501,0.245,IF(I6=20060501<=20070430,0 .194,IF(I6=20040501<=20060430,0.23,IF(I6=2002050 1<=20040430,0.158,0.145))))
WI =IF(I6=20070501,0.018,0)