Remember These 8 Rules Before Sending Out Your Next Invoice Not getting paid fast enough? Incomplete, incorrect or unclear invoices could be to blame. Here's how to get it right.

If at least a third of your receivables are 60-plus days delinquent, you're not alone. In fact, you're one of 40 percent of small businesses in that predicament--and your invoices may be partially to blame.

Incomplete, incorrect or unclear invoices could be sent back or remain unpaid until questions about them are answered, according to Flint Lane, founder and CEO of online billing company Billtrust, based in Hamilton Township, N.J.