Days payable outstanding (DPO) is the average number of days a business takes to pay its suppliers from the date of invoice. It is calculated as accounts payable divided by daily cost of goods sold (or daily total purchases). Higher DPO means the business holds cash longer before paying suppliers. DPO is a working capital lever — within ethical and contractual limits, longer DPO frees up cash without changing the underlying business.
DPO is the supplier side of the working capital equation. While DSO measures how fast customers pay you, DPO measures how slowly you pay suppliers. A business with strong negotiating leverage often runs higher DPO than its competitors — net-45 or net-60 vendor terms instead of net-15. Each additional day of DPO frees up cash equivalent to one day's worth of purchases, which is why large retailers obsess over DPO (some run DPO over 90 days, effectively using supplier credit to finance operations). The limit is supplier relationship damage — pushing DPO beyond what your terms allow, or paying late without negotiation, eventually leads to higher prices, withheld credit, or service problems.
DPO (days) = (Accounts Payable ÷ Cost of Goods Sold for Period) × Number of Days in Period
DPO is one of the cleanest ways to extend cash on hand without changing the business. Moving DPO from 20 to 30 days on a business with $1.2M of annual COGS frees up roughly $33K of permanent working capital. Owners often leave this money on the table — paying everything net-15 by reflex when net-30 or net-45 terms are available with a simple ask. The other side: if DPO is rising because the business can't pay (not because of negotiated terms), that's a cash crisis brewing, not a working capital optimization. The distinction matters.
Fynso tracks DPO by vendor and surfaces opportunities to negotiate longer terms with suppliers where the cash impact is meaningful. The brief flags vendors paid early consistently — often a sign that the business is funding suppliers at no benefit. When DPO is rising because of unpaid invoices, not extended terms, Fynso distinguishes the two patterns and surfaces the at-risk vendor relationships before they damage purchasing power.
Restaurants
A restaurant on net-15 supplier terms with $400K of monthly food and beverage purchases has roughly 15 days of DPO. Negotiating net-30 with the primary distributor (typical for restaurants over $1M revenue) doubles DPO and frees up an additional $200K of working capital — enough to cover 10 days of payroll in a slow week.
Construction
A general contractor often runs DPO of 30–45 days because subcontractor and material payment is timed against progress billing collection from the owner. When the owner pays late, the GC's DPO stretches further — a structural feature of construction working capital, not a sign of trouble unless DPO rises above 60 days consistently.
Retail
A specialty retailer with $80K of monthly inventory purchases moves DPO from 22 to 35 days through better term negotiation. The result: $35K of working capital freed up immediately. With healthy DSO (most retail collects at checkout), the business can fund inventory expansion without taking on a line of credit.
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