Cash Flow Tip No 5 - Issue your invoices as soon as you can. This is one task that should be first on the list every day because if you don't bill your customers you can't be paid. Once sent, make sure you follow up the day after the invoice is overdue. A polite phone call to jog the memory or a second email can help things along. Don't be afraid to take stronger action if the invoice remains unpaid.One of...