DSO stands for Days Sales Outstanding. Your company's DSO is the number of days invoices are outstanding on average. If you regularly grant trade credit, your DSO is the key indicator that enables you to assess how successful you are in receiving payments on time.
It's important to keep an eye on payment times. Long payment terms can hamper your company's growth. It has a negative impact on your cash flow, forcing you to postpone investments or expenditure.
A high DSO can have several causes. Long payment terms may be contractually defined, for example because they are a condition imposed by a customer with whom you like to do business. A second reason may be that the company needs to be more efficient in collecting invoices. Finally, you may be faced with customers who are unwilling or unable to pay your invoices.