DPO: how to manage payment terms with suppliers

DPO (Days Payable Outstanding) measures the average number of days you take to pay your suppliers. It is calculated as trade payables / (cost of goods sold / 365). It is the mirror image of DSO: while you want to lower DSO, DPO is in your hands and a higher value frees up cash. The key, however, is how you raise it. Negotiating longer payment terms upfront is a legitimate working capital tool. Paying late without an agreement is something else: it harms the supplier, your rating, and in the Czech market it fuels a systemic problem that already affects companies across the economy.¹

What DPO measures exactly and how to calculate it

Days Payable Outstanding expresses the average number of days between receiving an invoice from a supplier and paying it. It is an indicator of how long you "hold" other people's money in your operations before passing it on. The standard formula is:

DPO = trade payables / (cost of goods sold / 365)

If at year-end you have trade payables of CZK 12 million and annual cost of goods sold (COGS) of CZK 90 million, DPO works out to 12,000,000 / (90,000,000 / 365) = 48.7 days. In other words: you pay suppliers on average about 49 days after receiving the invoice.

Two notes on methodology. First, the denominator is cost of goods sold, not total revenue. The reason is that payables arise from purchases and inputs, not from the selling price. If you do not have COGS cleanly separated, use a consistent approximation (for example materials and purchased services) and keep it the same across periods so the trend is comparable. Second, for liquidity management it makes sense to calculate DPO quarterly or monthly from the average payables balance, not just from the closing balance-sheet figure, which can be randomly high or low.

DPO as the mirror of DSO: why it matters

DPO is the counterpart to DSO (Days Sales Outstanding). DSO measures how long you wait for money from customers, DPO measures how long suppliers wait for money from you. Both feed into the cash conversion cycle (CCC):

CCC = DSO + DIO − DPO

Where DIO is days inventory outstanding. This relationship reveals a practical consequence: every day you extend DPO shortens your cash cycle by one day and frees up working capital. For a company with daily purchasing turnover of around CZK 250 thousand, extending DPO by 10 days means roughly CZK 2.5 million in additional cash that you do not have to finance from an operating loan or from your own resources. That is money otherwise lying dead in a supplier invoice.

This is precisely why DPO is the only working capital component largely under your own control. DSO depends on customers' payment discipline, inventory on demand and logistics. But you and your purchasing function set the terms on your own payables. The question is therefore not whether to manage DPO, but how to manage it without undermining your supplier base.

Legitimate lever vs. late payment: where the line is

This is where it is decided whether DPO works as a tool or as a boomerang. There are two ways to increase DPO, and only one of them is sustainable.

Path one: negotiate longer terms upfront. You agree 60-day terms with a supplier instead of 30 and pay on time. This is standard working capital management. The supplier knows where it stands, factors it into its pricing, and the relationship stays healthy. Your DPO rises and cash is freed up legitimately.

Path two: simply pay late. You let invoices sit past their due date because it improves cash flow in the short term. This is a trap. In our experience it is the most common silent source of tension between a company and its suppliers. In the short term it looks like a saving; in the long term it means worse prices, preferential treatment for more reliable customers, the risk of supply being cut off, and in extreme cases legal recovery with default interest and cost reimbursement.

The difference is not cosmetic. With negotiated terms, a higher DPO is the result of an agreement. With late payment, a higher DPO is a symptom that you are passing your liquidity problem on to a weaker link in the chain. And in the Czech market this is not a theoretical consideration, it is a widespread problem.

Why late payment in the Czech market is not a neutral tactic

Data from the European market show how widespread the culture of late payment is. According to the EU Payment Observatory, operated by the European Commission, in 2023 the average payment term in B2B transactions reached 61.8 days, crossing the 60-day mark, and almost half of European companies (47%) reported problems due to late payments.¹ Furthermore, according to Intrum's European Payment Report 2024, companies in Europe pay their invoices on average 16 days later than agreed.²

The Czech Republic ranks among the worst in these league tables. According to the EU Payment Observatory, 65 percent of the Czech companies surveyed reported that they had run into problems due to late payments over the past half-year, while the European average stood at 47 percent.¹ This means almost two-thirds of Czech companies experience first-hand what it does to liquidity when a customer fails to pay on time.

The consequences are not merely administrative. Late payment spreads through the chain: a company that a customer fails to pay often delays paying its own suppliers. Delaying payments to suppliers is, according to the EU Payment Observatory, among the most common consequences of late payments in the Czech market.¹ So if you "optimise" DPO through late payment, you are not just gaining an advantage, you are co-creating a systemic risk that can come back to you from your own customers.

How to manage DPO in practice and fairly

The goal is not to maximise DPO at any cost, but to optimise it within agreed terms. The recommended approach:

Point four deserves attention. The early-payment discount changes the calculation. A 2 percent discount for paying within 10 days instead of the standard 30 days corresponds to an effective annual rate well above 30 percent. If you have the cash, taking such a discount is almost always more advantageous than artificially stretching DPO. Managing payment terms is therefore not just about "paying as late as possible", but about deciding according to the real cost of money.

A healthy DPO is thus the result of two things at once: well-negotiated contractual terms and the discipline to honour those terms. A company with a DPO of 55 days thanks to agreed terms and paying on time is in a far better position than a company with a DPO of 55 days made up of chronic arrears. The first builds a cash reserve, the second is sawing off the branch it sits on.

Where DPO fits in financial management

DPO is not an isolated indicator. It makes sense only in combination with DSO and days inventory outstanding, together as part of managing working capital and the company's entire financial management. Common mistakes we see: a company pushes on DPO without simultaneously addressing DSO, so it merely passes its customers' delays further down the chain. Or, conversely, it pays suppliers early out of surplus cash instead of putting that surplus to work elsewhere. Both are a signal that a coherent view of the cash cycle is missing.

If you do not know exactly where your company is losing freed-up cash, start by measuring. The free financial scan calculates your DPO, DSO and cash conversion cycle from your own data and shows how much capital you have needlessly tied up in working capital, without having to pay suppliers late.