Subtraction inside of an IF function

I am trying to subtract 2 different variable fields based on the input of a 3rd variable field. Something like this…

If([Ded_1_Description] = “Y” , Val([Ded_1_Annual_Price])-Val([Transaction_Fee_Month]) , “Free”)

But i cannot get the sting to populate. I can get the subtraction to function without the IF statement but once i place it into the IF statement i get an error.

Any help would be appreciated.

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