Hi,

These formulas: "=SUMPRODUCT(--(MONTH(Calc!C4:Calc!C65536)
=B4))" and "=SUMPRODUCT(--(MONTH(Calc!C4:Calc!C65536)
=B4),Calc!M4:Calc!M65536)" work perfect for all months
except for January. The result if the month in C3 =1 is
always wrong. Columns "C"and"M"are updating periodically
by inserting a new row at the top of them. Can you help
me to fix this problem?