Thanks Robert. What I really need to do is this -- I have several fields that have a preset payment amount (named, for example, [Payment1], [Payment2], [Payment3]. I have another field that does a calculation to determine which period I am in and returns a 1,2, or 3. I want a final field to display the current payment, which is determined by the 1,2, or 3. So what I was hoping to do is use concatenation somehow to link "Payment" with the calculated 1,2, or 3 for the field reference so that I can get it to dynamically refer to either Payment1, Payment2, or Payment3 based on which period I am in. I looked at IIF, but I don't think that I can include multiple else statements, and there are 25 periods. Thanks again, let me know if there is anything I can do.