SSRS - case in expression

Below is the expression used in my SSRS report. I need a case statement on one of the values to add if a negative number and subtract if positive. Can this be done and if so what would be the correct syntax. Thanks.

=iif(Fields!Book_Type.Value="Operating Lease",Sum(Fields!Principal.Value)
+ Sum(Fields!AccruedInterest.Value)
+ sum(Fields!Contract_Receivable.Value)
+ Sum(Fields!Equipment.Value)
+ sum(Fields!Current_Recv.Value)
- sum(Fields!Deferred_Income.Value)  Need to add if negative and subtract if positive
+ Sum(Fields!IDC.Value)
- Sum(Fields!Accum_IDC.Value)
+ sum(Fields!Sales_Tax_Recv.Value)
- sum(Fields!Deferred_Sales_Tax.Value)
- Sum(Fields!Subsidy.Value)
+ Sum(Fields!Accum_Subsidy.Value)
+ sum(Fields!Fee_Recv.Value)
- sum(Fields!Deferred_Fee.Value)
+ sum(Fields!Accum_Fee.Value)
+ sum(Fields!Current_Residual.Value)
- sum(Fields!Deferred_Residual.Value)
- sum(Fields!Residual_Recovery.Value)
- Sum(Fields!Non_Financed_Fee.Value)
+ Sum(Fields!Accum_Non_Financed_Fee.Value)
- sum(Fields!Depreciation.Value),
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Jim HornMicrosoft SQL Server Data DudeCommented:
A little clunky but should work..
IIF(sum(Fields!Deferred_Income.Value) > 0, 
   sum(Fields!Deferred_Income.Value)  * -1) 

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