Over the years clients have asked for reductions for volume, etc but we all have had trouble with past due invoices - and I believe past due should be after 30 days - most businesses have invoices to be paid on receipt, or wtihin 15 days but never past 30 days.  Why are we not asking for interest on any invoice paid after 30 days?  I know of no abstractor that does this and we have had problems with invoices past 30 days.  They may even include ones we have given discounts to which is truly ridiculous.