Days Payable Outstanding Explained

Days payable outstanding, or DPO, tells you how long your business takes, on average, to pay its suppliers. It sounds like a number only accountants care about, but it shapes your cash flow every single week. Here is what DPO means, how to calculate it and how to use it without damaging the supplier relationships your business depends on.

Every business that buys on credit has accounts payable: the invoices from suppliers that you have received but not yet paid. The timing of those payments decides how long cash stays in your bank account before it goes out the door. Pay everything the day it arrives and your cash disappears quickly. Pay everything late and your suppliers start asking for money up front.

DPO puts a single number on that timing. Once you know it, you can see whether you are paying in line with your terms, spot when things are slipping and plan better as you head into the busier final months of the year.

What days payable outstanding means

DPO is the average number of days between receiving a supplier's invoice (or goods) and paying for it. If your DPO is 30, you are paying suppliers about 30 days after you incur the cost, on average.

It is one of three working capital measures that are often looked at together:

• Days sales outstanding (DSO): how long customers take to pay you.
• Days inventory outstanding (DIO): how long stock sits before it sells.
• Days payable outstanding (DPO): how long you take to pay suppliers.

DSO and DIO measure how long your cash is tied up. DPO measures how long you get to hold on to it. Put together, they make up the cash conversion cycle, which we will come back to below.

The DPO formula

The standard formula is:

DPO = (average accounts payable / cost of goods sold) x number of days in the period

Here is what each part means:

• Average accounts payable: the opening balance plus the closing balance for the period, divided by two. You will find accounts payable on your balance sheet.
• Cost of goods sold (COGS): the direct cost of the products or services you sold in the period, from your profit and loss report.
• Number of days: 365 for a year, 90 for a quarter or 30 for a month. Use the same period for COGS and the day count.

Step by step

1. Choose your period. A quarter is a good balance between detail and stability.
2. Find accounts payable at the start and end. Pull both figures from your balance sheet.
3. Calculate the average. Add them together and divide by two.
4. Find COGS for the same period. Use your profit and loss report.
5. Divide and multiply. Average payables divided by COGS, then multiply by the days in the period.

If you do not have cost of goods sold

Many service businesses, consultancies and agencies have little or no COGS. In that case, some people calculate a version of DPO using total purchases from suppliers, or total operating costs paid on credit, instead. That is fine for tracking your own trend, as long as you use the same method every time and label it clearly.

How to read your DPO

There is no single "right" DPO. A good figure depends on your industry, your supplier terms and your bargaining power. The most useful comparison is with the payment terms you have actually agreed.

When DPO is lower than your terms

If your suppliers offer 30 days and your DPO is 12, you are paying early. That can be a smart choice if you are getting an early-payment discount or you want to be a favored customer. But if there is no benefit, you are giving away cash you could use elsewhere.

When DPO matches your terms

This is usually the healthy middle ground. You are using the credit your suppliers offer, your cash stays with you as long as agreed and your reputation stays intact.

When DPO is higher than your terms

If your terms are 30 days and your DPO is 55, you are paying late. Sometimes that is a sign of a cash squeeze. Sometimes it is a process problem, like invoices sitting unapproved in someone's inbox. Either way, it is worth investigating quickly, because late payments can lead to late fees, held deliveries or worse terms.

DPO and the cash conversion cycle

DPO is most powerful when you look at it alongside how long your cash is tied up in stock and unpaid customer invoices. The cash conversion cycle is commonly calculated as:

Cash conversion cycle = DSO + DIO minus DPO

The result is the number of days between paying for what you sell and getting paid for it. A shorter cycle means you need less cash to keep the business running. A longer one means you need more cash, or more borrowing, to bridge the gap.

For example, if customers pay you in 40 days, stock sits for 50 days and you pay suppliers in 30 days, your cycle is 40 + 50 minus 30 = 60 days. For two months, your money is working inside the business before it comes back. If you negotiated 45-day terms with suppliers and paid on day 45, the cycle would drop to 45 days. (These numbers are made up for illustration.)

A simple DPO tracker template

Copy these columns into a spreadsheet and add a row each month or quarter. Watching the trend is far more useful than a single figure.

In this made-up example, Q3 is the warning sign: DPO jumped to 45 days against 30-day terms. That is the moment to ask why, before suppliers start asking you.

How to manage DPO responsibly

The goal is not the highest possible DPO. It is a DPO that matches your agreed terms, supports your cash flow and keeps suppliers happy. Here are practical ways to get there.

Negotiate terms rather than paying late

If you need more time to pay, ask for longer terms openly. Many suppliers will agree for reliable customers, especially if you are ordering more or committing to a longer relationship. Agreed 45-day terms are far better than unofficial 45-day payments on 30-day terms.

Pay on the due date, not on receipt

Schedule supplier payments for the due date, not the day the invoice arrives. Most accounting tools and bank accounts let you schedule payments ahead of time, which keeps cash in your account longer without ever being late.

Take early-payment discounts when they make sense

Some suppliers offer a small discount for paying within a short window. Compare the discount with what that cash is worth to you elsewhere. If cash is plentiful, the discount may be worth taking. If cash is tight, paying on the normal due date may be wiser.

Fix your approval process

A surprising amount of late payment comes from invoices waiting for approval or getting lost in email. Set a single inbox for supplier invoices, a clear approver and a weekly payment run.

A quick note: this article is general information about financial measures, not financial or accounting advice. If you are making big decisions based on working capital, such as taking on financing or changing supplier contracts, talk with your accountant or a qualified adviser.

Frequently asked questions

The bottom line

Days payable outstanding tells you how long you take to pay suppliers, and it has a direct effect on how much cash you have on hand. Calculate it with average accounts payable divided by cost of goods sold, multiplied by the days in the period, then compare the result with your agreed terms.

Aim to pay on time, negotiate longer terms openly when you need them and track the trend each quarter. A steady DPO is a quiet sign of a well-run business that suppliers are glad to work with.