Dealing with severely overdue invoices is stressful for any business owner. When a payment crosses the 90-day threshold, standard follow-up emails are no longer enough, and the statistical likelihood of recovering the debt drops significantly. Here is your step-by-step guide to escalating the situation. Learn when to issue a formal demand letter, how to report the debt to commercial credit bureaus, and at what point you should consider involving a third-party collections agency or legal counsel.