Well cash flow is a real issue for us. We mow for the month, then send the bill on the first of the new month. I don't bill for stuff I haven't done yet. I don't want to complicate things. This year I added a line on my invoices about a late fee. Still had some people not pay on time. So I issued late fees of $20. Had one guy already call, he "refuses to pay a late fee". I said "fine, no problem just send me the money you owe me and we're good." He said the check was on the way. Had one lady cancel her service.