Since there seems to be an overabundance of companies that have resorted to holding our fees hostage- and having us pay the late fees we are charged for not paying our bills on time- what would be the proper way to be able to include a "late fee" on our invoices- can we do it without any notice-or does it have to be on the invoice when presented-( I would think so)- does it require an agreement signed by all parties before any work is performed-,getting their acceptance of those conditions and what are the limits- of it- I think a dollar a day after the customary 30 day time frame looks good- of course it looks even better if they have not paid for a year or so- but that 's money out of our pockets. 
I know this does little to satisfy all of those outstanding invoices we see listed up on here about "this company owes me so much from so long ago"- I just noticed an article about the fees banks now charge for credit card abuses- and the bank's reply to those fees was- "it's just part of the bank's policy- nothing can be done about it"   what if it was "just part of our policy" also?
I am just trying to come up with ways to close some of the non-payment issues that we all (some)seem to be enduring.
Let the ideas start coming in-

Steve Meinecke