>>Our software stores the original amount and current balance due. In some places, we calculate the difference to display the amount paid. That may include not only payments, but other allowances/adjustments, or the entire balance could have been cancelled. We've always called this "Amount Paid" for the lack of a better term, but now we are getting some quibbles about that, and we are looking for a better term. I've thought of "Amount Reduced" or "Balance Reduction", but I'm hoping for something better. Maybe some of you have run across this issue before? We just want to change the terminology, not the calculation.
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>One of my clients uses the term "Settlement". Settlement is the total of cash paid, credit card/debit payments and post-dated cheques (where allowed). Adjustments could be another type of settlement.
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>The value of the settlement may not be the same as the invoice or order total.

You can use the term NET ( which means Balance after deduction from gross)

Net Amount Due/ Net Due / Net Amount Paid / Net Amount Payable