Discounts and volume discounts still permit invoice write-offs

Even if you have an agreement with a firm as to discounts, or even that its discount level goes up as you pay more, you should still check their invoices. Just because the firm shaves some fees doesn’t mean it was completely efficient or did all the right things at the right times.

The justification for discounts or ladders of discounts is volume; the justification for bill review remains slips in efficiency or direction. Discounts, after all, don’t change behavior; write offs of invoices should.