Table 125 Aug 2026From “A customer P&L needs a cost boundary”

The customer P&L boundary

Put the cost object and decision purpose on the page before the allocation formula.

Table 1The customer P&L boundary

Level	Revenue or work object	Cost classes to inspect	Defensible driver	What the result can say	Failure mode
Order	Transaction, invoice, delivery, or implementation unit	Product, freight, transaction, rush, order handling	Order lines, events, hours, or documented transaction driver	Whether this order covered the chosen order boundary	Order margin is called customer profitability
Customer	Set of orders and account-specific work	Support, account management, customer credit, custom service	Account events, time, cases, or a tested service driver	Customer result under a stated method	Shared capacity is assigned by habit
Market	Customers and orders in a route, segment, or geography	Market development, channel, regulatory, and route costs	Market activity or route-level driver	Market or channel result under a stated scope	Country is used as a proxy for every cost
Business unit	Shared infrastructure and common capacity	Platform, leadership, tooling, unused capacity	A declared capacity or allocation rule	Unit economics under the chosen reporting purpose	The allocation is mistaken for causal cost

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Source: Author's framework grounded in Helgesen (2000) and Zbaracki, Ritson, Maklan, and Dean (2004). Helgesen's working paper is a Norwegian export setting; Zbaracki et al. is one price-adjustment firm. Neither supplies a universal service-cost allocation rule.

PNG4:3, 1600 × 1200, with the title, the source line and the attribution set in the image isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02.png

Source and evidence

Each line names a claim related to this exhibit, its source, and how it was checked.

A HLG00-C1 The setting is one industry in one country: "Norwegian exporters of klipfish and frozen fish are chosen as a context"Helgesen. (2000)
A HLG00-C2 The sample, verbatim: "the sample, consisting of 564 orders related to 176 customer and 36 geographical markets"Helgesen. (2000)
A HLG00-C3 The rule is stated as a rule: "Costs are assigned to the level where they are incurred (orders, customers, markets, etc.). All the revenues are related to the order level", and "Then revenues and costs from orders are transferred to the customer level"Helgesen. (2000)
A HLG00-C4 The paper says the method changes the answer: descriptive customer profitability can be built with "full costing (the absorp""tion method), (2) variable costing (the contribution margin method) or (3) activity based costing", and "These methods will of course tend to result in different designs of the specified accounts"Helgesen. (2000)
A ZRLDB04-C1 "the managerial costs are more than 6 times and customer costs are more than 20 times the menu costs"zbaracki-etal-2004-price-adjustment-costs
A ZRLDB04-C2 "in total the price adjustment costs comprise 1 22 of the company s revenue and 20 03 of the company s net margin": one firm, one periodzbaracki-etal-2004-price-adjustment-costs
B B08-C1 A customer P&L boundary should follow the cost object and where the cost is incurred, not the reporting convenience of a revenue dashboardAuthor framework grounded in Helgesen (2000)
B B08-C2 Service costs should be classified by order, customer, market, and business-unit level before a team decides whether to allocate them furtherAuthor framework grounded in Helgesen (2000) and Zbaracki et al. (2004)

Grades: A, verified against the printed page of the primary source · B, primary source, text layer only · C, authoritative secondary · D, reported.

From the essay

Growth that compounds

A customer P&L needs a cost boundary

Revenue is not customer profitability. Trace order, account, market, and shared-capacity costs to the object and decision they can support.

25 Aug 2026

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APA 7

Isoglu, S. (2026). The customer P&L boundary [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02/

BibTeX

@misc{isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02,
  author = {Isoglu, Sinan},
  title = {{The customer P\&L boundary}},
  year = {2026},
  howpublished = {Table 1, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02/},
  note = {From the essay {A customer P\&L needs a cost boundary}}
}

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<figure>
  <a href="https://isoglu.com/insights/exhibits/isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02/">
    <img src="https://isoglu.com/social/isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02.png" alt="Table 1: The customer P&amp;L boundary" width="3200" height="2400">
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  <figcaption>Table 1: The customer P&amp;L boundary. Source: Author&#39;s framework grounded in Helgesen (2000) and Zbaracki, Ritson, Maklan, and Dean (2004). Helgesen&#39;s working paper is a Norwegian export setting; Zbaracki et al. is one price-adjustment firm. Neither supplies a universal service-cost allocation rule. <a href="https://isoglu.com/insights/exhibits/isoglu-2026-a-customer-p-and-l-needs-a-cost-boundary-fig02/">View exhibit</a>.</figcaption>
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