I've worked it out....NaN appears when you divide 0 by 0....so my expression needs to be...
=iif(
(sum(Fields!income.Value)/ iif(sum(Fields!bal60.Value)=0,1,sum(Fields!bal60.V alue)))*100=0,
"No data",
(sum(Fields!income.Value)/ iif(sum(Fields!bal60.Value)=0,1,sum(Fields!bal60.V alue)))*100)
If anyone can think of any other ways I'm all ears..
Cheers...
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