Combined index & match formula

[MarkReddell]

Hello Mr XLers! This formula below only works when the date in my sales Tax Table matches the date in my materials date column. I need to be able lookup tax % with after 1/1/2019 which is the beginning date in my Sales Tax Table. Any help would be awesome! =IFERROR(ROUND(IF(COUNT([@Qty],[@[Unit Cost]])=2, [@Qty]*[@[Unit Cost]],IF(ISNUMBER(FIND("Tax",[@[Materials Destription]])), INDEX(SalesTax[Total %], MATCH(N9&T9,INDEX(SalesTax[Date]&SalesTax[City],,),1))*M7, IF(AND([@[Transaction Type]]="Refund", COUNT([@Qty],[@[Unit Cost]])=2), -[@Qty]*[@[Unit Cost]],""))),2),"")

 

[MarkReddell]

This part of formula is what I need help with: INDEX(SalesTax[Total %], MATCH(N9&T9,INDEX(SalesTax[Date]&SalesTax[City],,),1))