What is days payable outstanding?

Days payable outstanding measures the average number of days a company takes to pay its suppliers and vendors after receiving an invoice. The formula divides accounts payable by operating expenses, then multiplies by the number of days in your period. A consulting firm with $45,000 in AP and $180,000 in quarterly expenses has a DPO of 22.5 days, meaning it pays vendors on average in about 3 weeks.

The vendor relationship trade-off

Every extra day you hold cash is a day your vendor waits. Professional service firms average 22 days' pay, faster than retailers at 45 days. Neither is right nor wrong. The question is whether your timing aligns with your cash needs while preserving the relationships you value.

When fast payment makes sense

Early payment discounts change the math. 2/10 Net 30 means 2% off for paying in 10 days, which equals 36% annualized return. Take it. Also, pay fast when the vendor is critical to your operations or when the relationship matters more than cash optimization.