IF function

Hello,
I'm from Macedonia, we have to values for VAT, 18% and 5%. I try to separate values that have 18% VAT and 5% VAT. I'm using IF function but not is that I need
I'd like to SUM all cell from H2 to H24 that have 18% VAT in H27 and in G27 I'd like to SUM all cells that have 5% from H2 to H24