Days Payable Outstanding (DPO): Formula, Calculation, and How to Improve It

The DPO formula

DPO = (Accounts Payable ÷ Cost of Goods Sold) × Number of Days

• Accounts payable: the balance owed to suppliers (often the average of beginning and ending AP for the period).
• Cost of goods sold (COGS): the direct cost of the goods or services sold in the period.
• Number of days: 365 for a year, 90 for a quarter.

Worked example

A company carries $500,000 in average accounts payable and reports $3,000,000 in COGS for the year:

DPO = ($500,000 ÷ $3,000,000) × 365 = 60.8 days

On average, the company takes about 61 days to pay its suppliers.

What is a good DPO?

There's no universal target — it's heavily industry-dependent, and it's most useful compared against your own suppliers' terms and your peers:

DPO trend	What it signals	Watch for
Rising DPO	Keeping cash longer, better working capital	Late payments, lost discounts, supplier friction
Falling DPO	Paying faster	Cash leaving the business sooner than it needs to
In line with terms	Paying close to net-30/60 as agreed	Healthy — the usual goal

The ideal DPO pays suppliers as late as the agreed terms allow without missing due dates or forfeiting early-payment discounts that are worth more than the held cash.

DPO and accounts payable turnover

DPO is the inverse of the accounts payable turnover ratio (COGS ÷ average accounts payable):

DPO = 365 ÷ Accounts Payable Turnover

A turnover of 6 means the company pays off its payables six times a year — a DPO of about 61 days. Both describe the same thing from opposite angles.

DPO is also one leg of the cash conversion cycle (Days Inventory Outstanding + Days Sales Outstanding − DPO). A longer DPO shortens the cash conversion cycle, freeing up working capital.

How to improve DPO

"Improving" DPO usually means extending it deliberately — without breaking terms:

• Negotiate longer terms with key suppliers (net-30 → net-45/60).
• Pay on time, not early — unless an early-payment discount beats the value of holding the cash.
• Capture early-payment discounts when the math favors them (a 2/10 net-30 discount is a high effective annual return).
• Get visibility into due dates. You can't time payments you can't see. The bottleneck is usually invoices stuck in inboxes and manual data entry, not strategy.

That last point is where most teams lose control of DPO. When invoices are captured, coded, and routed for approval automatically, every due date and discount window is visible — so payments can be timed on purpose instead of paid late in a scramble. Accounts payable automation software handles that capture-to-approval flow, and the structured AP data it produces is what makes DPO measurable in the first place. For the full picture of where DPO fits, see the accounts payable process guide.

The bottom line

DPO tells you how long, on average, you take to pay suppliers — a lever on working capital that only works if you can see and time your payments. Calculate it with average AP over COGS, benchmark it against your terms and peers, and lengthen it deliberately rather than by accident. The foundation is clean, visible AP data, which starts with getting invoices out of inboxes and into a structured AP workflow.