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Cash Flow

Days Sales Outstanding (DSO)

Days Sales Outstanding (DSO) measures the average number of days between invoicing a customer and receiving payment. A DSO of 45 days means customers take about 6 weeks to pay. The faster customers pay, the more cash you have to run your business.

Formula

(Accounts Receivable / Total Credit Sales) × Number of Days

In plain English

Average number of days customers take to pay their invoices

Why Days Sales Outstanding (DSO) Matters

This metric reveals cash flow problems before they happen. If DSO is climbing, customers are paying slower and you might run out of cash even though sales look good on paper. Many profitable businesses fail because they can't collect fast enough.

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