Granting payment terms to a customer is a common decision. It is part of commercial life. It makes it possible to sell, align with market practices, meet buyer expectations, support a relationship, and sometimes win a contract.
But this payment term is not neutral. When a company agrees to be paid at 30, 45, 60, or 90 days, it finances its customer during that period.
It delivers before being paid. It invoices before collecting. It ties up capital in a receivable. That capital has a cost. Yet this cost is often poorly measured. It remains hidden behind margin, revenue, or the commercial
relationship. The company knows that a customer pays slowly, mobilizes cash, and worsens
Working Capital, but it does not always translate that reality into euros. And yet, this is essential. Calculating the cost of credit granted to a customer makes it possible to answer very concrete questions.
Is this payment term acceptable? Does the margin reward the capital tied up? Is a customer paying at 90 days really as profitable as they appear?
How much does a 30-day delay cost? Should the terms be renegotiated? Should this cost be included in the price? Should the credit limit be reduced?
Should a deposit be requested? The cost of customer credit is not only a financial calculation. It is a business arbitration tool.
Customer Credit Is Financing Granted to the
Customer
The starting point is simple. A credit sale means the company grants temporary financing to its customer. If it sells €100,000 with payment at 60 days, it agrees not to receive the cash until two months later.
During those two months, it carries a receivable of €100,000. That amount is an accounting asset, but it is not available cash.
The company must therefore finance this gap. It finances it through its cash, bank facilities, factoring, equity, or a combination of these sources.
This financing may be voluntary and profitable. But it must be measured. Because the customer temporarily uses part of the company’s capital.
Customer credit should therefore be seen as an allocation of capital. Every payment term granted implicitly says: we agree to immobilize this amount for this duration for this customer.
The economic question then becomes: what do we receive in return for this immobilization? The Basic Formula: Amount x Duration x Cost
of Capital
The simplest calculation of the cost of customer credit is based on three elements. The amount of the receivable. The duration for which that amount is tied up.
The annual cost of capital or financing.
The basic formula is:
Customer credit cost = Receivable amount x number of financed days x annual cost of capital / 365 This formula makes it possible to convert a payment term into an economic cost.
For example, an invoice of €100,000 paid at 60 days, with an annual cost of capital of 8%, represents:
100,000 x 60 x 8% / 365 = approximately €1,315
This €1,315 corresponds to the economic cost of financing granted to the customer for 60 days. It is not necessarily a visible accounting charge line by line.
But it is a real cost for the company: financing cost, opportunity cost, treasury cost, or cost of tied- up capital. This simple calculation already makes visible what is often invisible.
A payment term has a price.
Choosing the Right Cost of Capital
The formula depends on the rate used. This rate may vary depending on the company. The company can use its average short-term financing cost if the objective is to measure the treasury cost.
It can use the weighted average cost of capital if it wants to measure the overall economic cost of the resources mobilized.
It can use the factoring or receivables financing rate if receivables are financed through that channel. It can use an internal reference rate defined by finance leadership.
The important thing is to use a coherent and stable rate. The rate should not become a pretext for avoiding the calculation.
Even an approximation is better than no measurement. If the company does not know which rate to use, it can start with a simple rate, for example 6%, 8%, or 10%, depending on its financing environment and internal cost of capital.
The objective is not to produce academic precision. The objective is to make the cost visible for decision-making. A payment term that is free in commercial negotiation is never free in cash.
Calculating the Cost of the Contractual
Payment Term
The first level of calculation is to measure the cost of the contractual payment term granted to the customer. If the customer benefits from 60-day payment terms, the company theoretically finances the receivable for 60 days from the invoice date.
Example:
Invoiced amount: €250,000
Payment term: 60 days
Annual cost of capital: 8%
Cost = 250,000 x 60 x 8% / 365
Cost = approximately €3,288
This sale therefore immobilizes around €3,288 in financial cost during the contractual payment term. If the gross margin on the sale is €50,000, this cost represents around 6.6% of margin.
If gross margin is €10,000, it represents around 32.9% of margin. The same payment term therefore does not have the same impact depending on margin.
This is an important idea. A payment term that is acceptable on a high-margin sale can be much more problematic on a low- margin sale.
Calculating the Cost of the Real Payment
Term
The contractual payment term is not enough. The real payment term must be measured. If a customer has 60-day terms but pays on average at 80 days, the company does not finance 60 days.
It finances 80 days.
Example:
Invoiced amount: €250,000
Real collection time: 80 days
Annual cost of capital: 8%
Cost = 250,000 x 80 x 8% / 365
Cost = approximately €4,384
The difference between the contractual term and the real term is the cost of delay or payment drift. In this example, moving from 60 to 80 days costs:
250,000 x 20 x 8% / 365 = approximately €1,096
This amount corresponds to the additional cost of delay. It may seem modest on a single invoice, but it becomes significant across a portfolio or for a recurring customer.
If this customer generates several million euros in sales per year, these additional days can represent a significant cost. That is why negotiated terms and observed terms must be distinguished.
The customer does not cost what they promise. They cost what they practice.
Calculating the Cost of a Payment Delay
A payment delay can be calculated separately. The formula is the same, but only the days late after due date are taken into account.
Cost of delay = Overdue amount x number of days late x annual cost of capital / 365
Example:
Invoice: €100,000
Delay: 30 days
Annual cost of capital: 8%
Cost = 100,000 x 30 x 8% / 365
Cost = approximately €658
This calculation is useful for making the cost of delay concrete. A delay is not only an operational irritation. It is an additional use of the company’s capital.
A 30-day delay on €100,000 at 8% costs around €658. A 30-day delay on €1 million costs around €6,575. A 45-day delay on €5 million costs around €49,315.
These amounts can be compared with margin, collections cost, or commercial concessions. They make the discussion more objective.
Calculating Average Capital Tied Up
To analyze a customer over a period, it is not enough to look at one invoice. The company must look at average exposure.
Average exposure represents the average capital tied up with that customer.
A simple approximation is:
Average exposure = Annual customer revenue x average collection time / 365
Example:
Annual customer revenue: €3,000,000
Average collection time: 75 days
Average exposure = 3,000,000 x 75 / 365
Average exposure = approximately €616,438
This means the company ties up on average around €616,000 to finance this customer. If the annual cost of capital is 8%, the annual cost of customer credit is:
616,438 x 8% = approximately €49,315
This calculation is very useful. It makes it possible to move from an invoice-by-invoice reading to a customer portfolio reading. It answers a central question: how much capital does this customer mobilize on a permanent basis?
Comparing the Cost of Credit With Customer
Margin
The cost of credit must be compared with the margin generated by the customer.
Example:
Annual revenue: €3,000,000
Gross margin: 8%
Annual gross margin: €240,000
Average collection time: 75 days
Cost of capital: 8%
Annual cost of customer credit: €49,315
Margin after cost of customer credit becomes:
240,000 - 49,315 = €190,685
The customer remains profitable. But their real contribution is lower than the gross margin displayed. The cost of credit represents around 20.5% of gross margin.
This type of calculation changes the commercial discussion. The issue is no longer only: this customer generates €3 million in revenue. The issue becomes: this customer generates €240,000 in gross margin, but ties up around €616,000 in capital and costs around €49,000 in annual financing.
This reading makes it possible to assess the financial quality of the relationship.
Integrating the Probability of Delay
Not all customers pay in the same way. Some regularly pay on due date. Others often pay late. Others alternate between normal payment, broken promises, disputes, and partial payments.
To integrate this reality, the company can reason in terms of expected payment time. If a customer has 60-day terms but pays 30 days late in 40% of cases, the expected average term is not simply 60 days.
It can be estimated as follows:
Expected term = contractual term + probability of delay x average delay days
Example:
Contractual term: 60 days
Probability of delay: 40%
Average delay when it occurs: 30 days
Expected term = 60 + 40% x 30
Expected term = 72 days
The company can then calculate the cost of credit over 72 days rather than 60. This method remains simple, but it takes the customer’s real behavior into account.
A customer whose delays are probable should be analyzed with a longer financial term than their contractual term.
Integrating Loss Risk
The cost of customer credit is not limited to payment time. Non-payment risk must also be considered. This risk can be estimated through a probability of default or loss, even approximately.
Simple formula:
Expected risk cost = Exposed amount x probability of loss x estimated loss rate
Example:
Average exposure: €500,000
Probability of default or significant loss: 2%
Loss rate in case of default: 50%
Expected risk cost = 500,000 x 2% x 50%
Expected risk cost = €5,000
This amount should be added to the financing cost if the company wants to measure the overall economic cost of customer credit.
The total expected cost then becomes:
Financing cost + expected risk cost
This approach is particularly useful when comparing two customers. A customer who pays slowly but carries very little risk does not have the same profile as a customer who pays slowly and presents a high risk of loss.
Payment delay costs capital. Risk costs uncertainty and potential loss. The two must be distinguished, then combined.
Integrating Disputes and Deductions
The cost of customer credit can also be worsened by disputes and deductions. A customer that often disputes invoices immobilizes cash for longer.
A customer that regularly deducts amounts reduces the cash actually collected. A customer that requires many credit notes or corrections consumes internal time.
These elements can be integrated in a simple way.
The company can calculate:
Annual amount of accepted deductions. Annual amount of credit notes linked to errors or disputes. Cost of additional delay linked to disputes.
Estimated management time.
Example:
Annual gross margin: €240,000
Annual cost of customer credit: €49,315
Accepted deductions: €15,000
Credit notes linked to disputes: €10,000
Adjusted contribution = 240,000 - 49,315 - 15,000 - 10,000
Adjusted contribution = €165,685
The customer may still be profitable. But their real contribution is much lower than the initially perceived margin. This reading avoids treating the cost of credit as an isolated calculation.
Delay, risk, disputes, and deductions are all part of the same reality: the financial quality of the customer.
Integrating Management Cost
Some customers are expensive to manage. They require complex portals, specific supporting documents, multiple reminders, difficult matching, frequent exchanges, commercial arbitrations, corrections, or regular meetings.
This cost is rarely calculated precisely. But it can be estimated.
For example, the company can use:
Annual number of hours spent on the customer x average loaded hourly cost of the teams involved
Example:
Estimated annual time: 120 hours
Average loaded hourly cost: €50
Management cost = 120 x 50
Management cost = €6,000
This amount may seem secondary. But for complex customers, it can become significant, especially when margin is low. Management cost does not necessarily need to be included in all standard calculations.
But it should be considered for important, dispute-prone, or highly resource-consuming customers. A customer relationship can be profitable in terms of margin but weak in net contribution if it consumes too much effort to be collected.
Building a Margin After Cost of Customer
Credit
A practical method consists in building an adjusted margin. Starting point: customer gross margin. Then subtract the costs linked to credit and cash conversion.
Adjusted margin = Gross margin - financing cost - expected risk cost - deductions - credit notes
linked to disputes - specific management cost
Full example:
Annual revenue: €3,000,000
Gross margin: 8%
Annual gross margin: €240,000
Average collection time: 75 days
Cost of capital: 8%
Average exposure: €616,438
Financing cost: €49,315
Expected risk cost: €5,000
Accepted deductions: €15,000
Credit notes linked to disputes: €10,000
Specific management cost: €6,000
Adjusted margin = 240,000 - 49,315 - 5,000 - 15,000 - 10,000 - 6,000
Adjusted margin = €154,685
Gross margin was €240,000. The adjusted contribution after credit cost and cash frictions is €154,685. The gap is significant. This is not an automatic reason to refuse the customer.
But it is a serious basis for deciding: price, terms, limit, guarantees, collections priorities, and actions to reduce disputes.
Calculating the Cost of an Additional
Negotiated Payment Term
When a customer asks for longer payment terms, the company must be able to quantify the concession. Suppose a customer asks to move from 60 to 90 days.
Expected annual revenue: €2,000,000
Additional term: 30 days
Cost of capital: 8%
Annual cost of the additional term = 2,000,000 x 30 x 8% / 365
Cost = approximately €13,151
Granting 30 extra days therefore means financing around €13,151 of annual cost. This amount can be compared with expected additional margin, the negotiated price, or the customer’s strategic value.
If the customer asks for 30 additional days without compensation, the company is granting a financial concession. It may choose to accept it.
But it should do so consciously. The calculation turns a vague commercial discussion into an economic arbitration.
Calculating the Benefit of Improving Payment
Time
The calculation also works in the other direction. If the company reduces a customer’s real payment time from 90 to 60 days, it releases cash.
Annual revenue: €2,000,000
Reduction in payment time: 30 days
Cost of capital: 8%
Annual gain = 2,000,000 x 30 x 8% / 365
Gain = approximately €13,151
But there is also an immediate cash effect. The reduction in average exposure is:
2,000,000 x 30 / 365 = approximately €164,384
This means the company releases around €164,000 of tied-up capital. This type of calculation is very useful for prioritizing actions.
Reducing the payment time of a large customer by 30 days can have a much greater Working
Capital impact than addressing many small isolated delays. The cost of customer credit therefore also helps manage collections and negotiation priorities.
Using the Calculation to Set a Credit Limit
The credit limit must take into account the amount the company is willing to finance. If a customer buys €500,000 per month and pays at 60 days, their normal exposure can reach around €1 million.
If the customer pays closer to 90 days, normal exposure can reach €1.5 million. The limit must therefore be consistent with the real purchasing and payment cycle.
But it must also be consistent with margin and cost of capital. A high limit granted to a low-margin, slow-paying customer can tie up a lot of capital for limited contribution.
Calculating the cost of credit makes it possible to ask a more precise question:
Does this limit finance a profitable relationship? Or does it finance a customer that consumes too much capital compared with their contribution?
The credit limit then becomes a capital allocation tool. Not only a risk ceiling.
Using the Calculation to Negotiate Price
The cost of customer credit can also be integrated into pricing. If a customer asks for long payment terms, that term can be included in the price.
The company can propose several options:
Standard price with payment at 30 days. Different price with payment at 60 or 90 days. Early payment discount. Deposit at order.
Milestone billing. Specific guarantee or coverage. This logic makes the cost of delay visible. It prevents late payment from becoming a free concession.
Of course, not every company can always impose this type of structure. Commercial bargaining power, the market, and competition play a role.
But even when the price cannot be changed, the calculation remains useful. It shows what the company agrees to finance. It also supports arbitration between margin, volume, and cash.
Using the Calculation to Segment Customers
Not all customers have the same cost of credit. Some pay quickly, generate few disputes, and tie up little capital. Others pay slowly, challenge, deduct, and consume a lot of exposure.
Calculating the cost of credit makes it possible to segment the portfolio. High-margin customers with low cost of credit. High-margin customers with high cost of credit.
Low-margin customers with low cost of credit. Low-margin customers with high cost of credit. This segmentation is very useful. High-margin customers with low cost of credit should be developed.
High-margin customers with high cost of credit may be attractive, but they must be structured. Low-margin customers with low cost of credit can remain acceptable if they are simple and smooth.
Low-margin customers with high cost of credit must be challenged. This approach moves beyond revenue. It looks at the real return on customer capital.
Avoid Seeking False Precision
It is important to stay pragmatic. The cost of customer credit does not need to be calculated with perfect precision to be useful.
Data may be imperfect. The cost of capital may be approximate. The probability of delay may be estimated. Management cost may be evaluated roughly.
That is fine at the beginning. The objective is to provide an order of magnitude. A commercial decision can change when the company understands that a customer ties up €600,000 of capital, costs €50,000 per year in financing, and generates €25,000 in deductions.
Even if the exact figure is debatable, the economic reality becomes visible. A simple calculation used in decisions is better than a perfect model that is never applied.
The method must remain understandable for sales, finance, Credit Management, and leadership.
The Limits of the Calculation
Calculating the cost of customer credit is powerful, but it should not become mechanical. A customer may have a high credit cost and still be strategic.
A market may impose long payment terms. A relationship may be important for image, volume, access to a sector, or future development.
A customer may consume capital today but open a profitable growth opportunity tomorrow. The calculation does not replace judgment. It informs it.
It makes it possible to know what the company is financing and at what price. Then the decision can integrate strategy, competition, potential, relationship, risk, and the company’s ability to carry this Working Capital Requirement.
The danger is not accepting a high cost of credit. The danger is accepting it without knowing.
The Role of Credit Management
Credit Management is naturally positioned to carry this method. It knows payment times, delays, limits, disputes, payment behavior, exposures, and causes of blockage.
It can turn this information into an economic reading. How much does this customer cost in financing? What margin remains after cost of delay?
Which delay destroys the most value? Which limit ties up too much capital? Which additional payment term must be rewarded? Which customer deserves renegotiation?
Which customer should be secured? This approach repositions Credit Management. It is not only about saying yes or no. It is about helping the company understand the cost of the credit it grants and decide whether that cost is acceptable.
The Credit Manager then becomes an actor in real profitability. Not only a risk controller.
Conclusion: Measuring the Cost of Credit
Means Making the Price of Time Visible
Credit granted to a customer has a cost. This cost comes from payment terms, tied-up capital, delays, risk of loss, disputes, deductions, and sometimes management complexity.
As long as it is not measured, it remains invisible. Margin seems higher than it really is. The customer seems more profitable.
The payment term seems free. The delay seems only operational. The credit limit seems administrative. The calculation changes that perception.
With a simple formula, the company can measure the cost of time:
Amount x financed days x cost of capital / 365. It can then enrich the analysis with real payment time, probability of delay, loss risk, deductions, disputes, and management cost.
This method makes it possible to compare customers, negotiate terms, adjust limits, prioritize collections actions, and better measure real profitability. Customer credit is not free.
It is capital granted to a customer for a certain period of time. Measuring it is not refusing to sell. It is selling with a more precise awareness of what the company is financing.
And in a Cash & Working Capital logic, that awareness makes all the difference.