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In my experience, companies either have been around long enough to have
established standard practices for accounts payable that are pretty much
set in stone and non-negotiable, or are start-ups where someone can call
the accounting person and get you a check the same day.
For clients who don't already have their own, I provide a services
contract that includes schedules for partial and final billing and for
the handover of deliverables. The client receives usable final documents
(usually PDFs) on their deadlines, and handover of source files happens
on receipt of the final payment. If I want to encourage fast payment, I
try to negotiate a rate that's 10% higher and if I succeed include a
statement on each invoice that offers a 10% discount if payment is made
within five business days. The start-ups love that one, but larger
companies seldom make the effort to save the 10%.