One way:

=IF(OR(B6=0,B7=0, B6<B7),"",B6-B7)




In article ,
Jock wrote:

Hi,
Having a problem here. Essentially: In cell B9
=IF(either B6 OR B7=0,"",If(B6<B7,"",B6-B7)
Can someone sort this one out for me?

Thanks