put in text like so.

=TEXT(IF(ROWS(E$4:E4)>$C$1,"",INDEX(INDEX(Overview!$A:$AZ,0,MATCH(E$3,Overview!$1:$1,0)),MATCH("Yes-"&ROWS(E$4:E4),Overview!$AA:$AA,0))&""),"$#,##0.00")