What is the uncollective noun for proration, which can be used with 's'?
people; collective noun
person; uncollective noun
The proration above can be used in such a context.
Ex. Changing a subscription often results in a proration: a charge adjustment. So you can prepare your customer for any additional expense that comes with a plan change, we provide a method of previewing a proration. Alternatively, you can choose to disable proration.