@jason_eliot
Welcome to the community!
The Property Data Format assigned to a Property controls the precision with which it is displayed in a Schedule Tag. What Property Data Format is assigned to your area Property? What precision setting does that Property Data Format have?
If that Property Data Format is not set to a precision of 0 and it is used in other situations where the current precision needs to be maintained, you can make a copy of it, set an appropriate name, edit the precision in the copy, and assign the copy to your Property. The out-of-the-box US Imperial content Area Property Data Format has the precision set to 0.
If that Property Data Format is set to a precision of 0 but that is not what you are seeing in the Schedule Tag, then something else is a play here. Post a sample file with your custom tag that demonstrates the issue, so that someone here can take a look and sort out why it is behaving the way it is.
David Koch
AutoCAD Architecture and Revit User
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