Fractional CFO
DSO vs DPO: The Two Numbers That Drive Your Working Capital
Days sales outstanding measures how fast customers pay you. Days payable outstanding measures how fast you pay vendors. How to calculate both, what healthy looks like by industry, and how to move each without damaging relationships.
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DSO vs DPO: What Each Measures
- Days sales outstanding (DSO) is the average number of days between invoicing a customer and collecting the cash. It measures how long your revenue sits in accounts receivable.
- Days payable outstanding (DPO) is the average number of days between receiving a vendor invoice and paying it. It measures how long you hold cash before it goes out the door.
- The DSO vs DPO comparison is directional: cash arrives on DSO's schedule and leaves on DPO's schedule, so the gap between the two is a standing loan you are either extending or receiving.
- A business that collects in 25 days and pays in 45 is being financed by its vendors. One that collects in 60 and pays in 20 is financing everyone else.
- Neither number is good or bad in isolation. The pair, read together against your industry's norms and your own history, tells the story.
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Educational content, not tax, legal, or accounting advice. Confirm with a CPA before acting.
Frequently asked questions
What is the difference between DSO and DPO?
DSO (days sales outstanding) measures how many days, on average, it takes to collect cash after invoicing a customer, so it tracks accounts receivable. DPO (days payable outstanding) measures how many days you take to pay vendor invoices, so it tracks accounts payable. In a DSO vs DPO comparison, the gap between the two shows whether vendors are effectively financing your operations or you are financing your customers.
How do I calculate DSO and DPO?
DSO is accounts receivable divided by credit sales for the period, multiplied by the days in the period. DPO is accounts payable divided by cost of goods sold (or total purchases), multiplied by the same day count. Use average balances rather than a single point in time, keep the formula consistent month to month, and chart the trend, a single reading means far less than the direction of travel.
What is a good DSO for a small business?
It depends entirely on industry. Retail and restaurants run near zero because customers pay immediately. B2B service firms typically land between 30 and 60 days, and construction or government work often runs 60 to 90 because of retainage and pay-when-paid chains. The better benchmark is your own history: a DSO drifting upward over two or three quarters signals a collections problem regardless of the absolute level.
Is a high DPO good or bad?
A higher DPO holds cash in the business longer, which helps working capital, but only when it comes from negotiated terms. Extending payables by agreement, net-45 or net-60 with your largest vendors, is a legitimate lever. Stretching terms silently by paying late damages supplier relationships, costs you priority and credit, and often forfeits early-pay discounts whose implied annualized return would have beaten the float you gained.
How do DSO and DPO affect the cash conversion cycle?
The cash conversion cycle equals days inventory outstanding plus DSO minus DPO, so DSO lengthens the cycle and DPO shortens it. For a services business with no inventory it reduces to DSO minus DPO. Every day cut from the cycle releases roughly one day of revenue in cash, permanently. A negative cycle, collecting before you pay, means customers and vendors are funding your growth instead of your bank account.
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