Pursuing overdue invoices is a fact of PR agency life. Some clients are chronically late, others are downright deceptive in their delinquency. Sometimes, an invoice really may be buried in a drawer or stuck in a spam filter.

Regardless of the reasons for compensation delays, one thing is certain: Collecting on overdue invoices is not getting any easier.

"In the wake of Sarbanes-Oxley, Enron, and the push for more corporate transparency, we see more layers of approval slowing down payment," says ...