Collections specialists work in a company’s accounting and billing departments to collect overdue bills from a client or customer. When bills fall into delinquency, a collections specialist reviews the accounts and contacts the clients or vendors to work out a payment plan with accounts receivable. The debt that is owed to the company may be passed on to a bank, a debt counselor, or an external third-party collector. In some cases, a collections specialist will work with credit or a bank loan to ensure payment is made.