Interest / late penalties on invoices

[Macho Philipovich]

 Hi there,

How do you (or would you) handle interest or late charges on invoices
that go unpaid beyond the agreed time, say on a monthly basis, when this
was part of the initial agreement with the client?

Would you unpost your initial invoice, add the interest charges, then
repost and reprint it? Do the dates included need to change, in this
case? What if other new billable items have accrued in the intervening time?

Or is it better to somehow cancel the existing invoice and create a new
one, presumably with its own new invoice number?

Or is there some other, better way altogether of doing this? Issuing an
additional invoice that only contains the interest charge seems absurd,
but maybe there's another option I'm neglecting.

I couldn't find this addressed in the manual or anywhere else, so thanks
for any guidance you can provide!

Macho