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(value / "divide by") &nbsp;has "divide by" zero error ( or more formally ) (numerator / denominator) &nbsp;has divide by zero error You need to test if the denominator is zero (your existing formula tests the numerator) =iif(sum(Fields!Calculated_Revenue.Value) = 0, 0, sum(Fields!Calculated_Inv_Margin.Value)/sum(Fields!Calculated_Revenue.Value)) note: you also need to test the summed value, just like you have used in the calculation 
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Hello!
I'm new to SSRS - using - Report Builder 3 with Epicor.  I have a formula that should prevent a divide by 0 error.  
=iif(Fields!Calculated_Inv_Margin.Value = 0, 0,
sum(Fields!Calculated_Inv_Margin.Value)/sum(Fields!Calculated_Revenue.Value))
It does the percent calc great - but anything with a 0 gets an #Error.  So I took out the divide calc and just had the revenue field show - that works.  Why doesn't the the calc above just give me a 0?
Any help would be great!  Thank you! 

SSRS &quot;If - then - else&quot; formula  #error

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SSRS &quot;If - then - else&quot; formula #error

SSRS "If - then - else" formula #error