DPO (Days Payable Outstanding) measures the average number of days a brand takes to pay suppliers after receiving inventory or services. The formula is (accounts payable / COGS) × days in period, where the period is 365 for an annual view or 90 for a quarterly one. In operator terms, DPO is the number of days the brand finances inventory through supplier credit instead of its own cash.
COGS is the denominator (not revenue) because accounts payable is built up by inventory and service purchases that flow through COGS, so the ratio compares like to like. DPO is only meaningful when the AP ledger is accurate; many small DTC brands run AP on a cash basis and have no real DPO to read.
DPO is the payables side of the cash conversion cycle: CCC = DIO + DSO − DPO. Every additional day of DPO shortens CCC one-for-one. At $200K/month of inventory purchases, stretching terms from net-30 to net-60 frees roughly one month of purchases (on the order of $200K of working capital), though the exact figure depends on purchase cadence and how much of AP was already term-financed.
Supplier credit is constrained by the relationship. Overseas factories typically demand cash or letter-of-credit terms; domestic suppliers more often offer net terms. Extensions are usually available to brands with payment history and volume, but suppliers rarely volunteer them.
Stretching DPO too aggressively also strains supplier relationships and can forfeit early-payment discounts. A 2/10 net-30 offer (2% off if paid within 10 days) annualizes to roughly 2% / 98% × 365/20 ≈ 37%, which usually beats the implied cost of stretching. Take the discount when it is offered; negotiate longer terms when it is not.