=IF(E20="",0,(E20-E19))

--
HTH

Sandy
In Perth, the ancient capital of Scotland
and the crowning place of kings


with @tiscali.co.uk


"john" wrote in message
...
I have a sum formula that shows =(E20-E19) and when i do not have a number
in
e20 it shows e19 with a negative. I need a formula that will give a zero
if
there is no number in the e20 cell.