Days Sales Outstanding (DSO)

Revenue on the income statement does not equal cash received. A company can be highly profitable on paper but cash-poor if customers take months to pay. DSO quantifies this gap. A rising DSO means the company is waiting longer to collect, tying up more cash in receivables. This directly reduces operating cash flow and may signal deteriorating customer quality or aggressive revenue recognition.

DSO is one of three components of the Cash Conversion Cycle (CCC): CCC = DSO + Days Inventory Outstanding (DIO) - Days Payable Outstanding (DPO). DSO represents how long it takes to collect from customers. A company wants DSO to be as low as possible while keeping DPO high (paying suppliers slowly) to minimize the cash cycle. Negative CCC (e.g., Amazon) means the company collects from customers before paying suppliers.

A single DSO number is less useful than the trend over time and comparison to peers. Increasing DSO may indicate: customers are paying more slowly, the company is extending more generous credit terms to win business, or revenue is being recognized aggressively before cash is actually collectible. Decreasing DSO suggests improved collections, tighter credit policies, or a shift toward cash/prepaid customers.