Cross-Border Pipeline Taxation: A Case for EACOP (Part 1)

Linkedin Twitter Envelope

The Complexities of Residency and Permanent Establishment

When a pipeline crosses a national border, it doesn’t just move oil, it moves tax questions with it. Who has the right to tax the company that owns and operates that pipeline? Is it the country where the company is headquartered, the countries the pipeline physically passes through, or both? These questions sit at the heart of international tax law, and they become especially pointed for a project like the East African Crude Oil Pipeline (EACOP), which runs from Uganda through Tanzania to the port of Tanga.

To understand why EACOP’s tax treatment is complicated, it helps to first understand two foundational ideas in international tax: residency and permanent establishment (PE) and then look at the more technical machinery each one relies on.

1. Residency

a.     Two Competing Claims on the Same Income

For over a century, international tax systems have relied on two basic principles to decide which country gets to tax income: residence and source. A country of residence generally claims the right to tax a person or company’s income in full, wherever in the world it was earned, this is called comprehensive or “worldwide” taxation. A source country, by contrast, only taxes the income generated within its own borders.

The trouble is that every country defines “residency” a little differently, and there’s no single global rulebook forcing consistency. Domestic tax law is left entirely to each state, and states use different tests: incorporation, place of effective management, place of central management and control, or some combination of these. Where two countries each conclude, under their own separate rules, that the same company is their resident, the result, if left unresolved, is double taxation: the same profit taxed in full, twice, by two different treasuries.

b.    The Tie-Breaker Mechanism

Tax treaties modeled on the OECD Model Tax Convention (OECD MTC) address this through Article 4. Article 4(1) allows each contracting state to define residency under its own domestic law. Article 4(3) then supplies the tie-breaker for companies: where an entity qualifies as resident in both states under their respective domestic rules, its treaty residence is decided by the location of its place of effective management (POEM).

POEM is generally understood as the place where key management and commercial decisions necessary for the conduct of the entity’s business as a whole are, in substance, made, as distinct from the place where day-to-day operational decisions are taken, or the jurisdiction of incorporation. Tax authorities and courts typically look at a cluster of factors to locate it: where the board of directors (or equivalent governing body) usually meets and makes its decisions, where the chief executive and other senior officers ordinarily carry out their activities, where the entity’s headquarters are located, which country’s laws govern its legal status, and where its accounting records are kept. No single factor is decisive; POEM is a question of substance over form, assessed on the facts.

This “substance over form” approach traces back to a foundational early twentieth-century case, De Beers Consolidated Mines Ltd v Howe, in which a diamond-mining company incorporated and largely operating in South Africa was nonetheless held to be a UK tax resident, because the real, central control and management of the business, its board meetings, its major decisions, took place in London. That single ruling effectively seeded the “central management and control” test that most residency-based systems, and Article 4(3) of the OECD MTC, still lean on today.

The test is not always easy to apply cleanly, and treaty tie-breakers don’t eliminate disputes entirely, they just move the argument from “which country taxes this?” to “where, precisely, is management actually exercised?” In Lee and Bunter v HMRC, for example, UK trustees tried to rely on the UK-Mauritius tax treaty to argue that a trust’s gains fell outside UK tax; the tribunal instead found that effective management was exercised in the UK despite formal indicators pointing to Mauritius, and taxed the trust accordingly. The lesson generalizes: tie-breaker rules only work as well as the underlying facts allow, and a company’s own paperwork, certificates of incorporation, registered offices, minute books signed offshore, will not save it if the real decision-making happens elsewhere.

c.     Why Pipeline Companies Rarely Trigger This Fight

Given that cross-border pipeline projects are increasingly structured as a single integrated company operating across two or more states, exactly the profile that could easily trigger a POEM dispute, it is notable that reported residency conflicts involving pipeline companies are rare. Two structural features explain this.

First, most cross-border pipelines are underpinned by an intergovernmental agreement (IGA) between the host states before a single pipe is laid. These IGAs frequently include specific tax harmonization provisions, allocating taxing rights and aligning treatment between the states in advance, which pre-empts the kind of ambiguity that produces POEM litigation elsewhere.

Second, because most states have converged on the “place of effective management” standard rather than pure incorporation-based residency, and because pipeline companies typically maintain a clearly identifiable single management structure at their contractually designated headquarters, there is usually little genuine ambiguity about where they are managed. The risk is not eliminated, however: because some states still determine residency solely by place of incorporation, a pipeline company incorporated in one state but managed from another could, absent a governing tax treaty or IGA provision, find itself claimed as a resident by both.

2. Permanent Establishment

a.     The Basic Architecture

Where residency decides which state can tax a company’s worldwide income, permanent establishment decides whether, and how much, a source state can tax the profits a foreign company earns from activity conducted within its territory.

Article 7(1) of the OECD MTC is the operative rule: the business profits of an enterprise of one contracting state are taxable only in that state, unless the enterprise carries on business in the other contracting state through a permanent establishment situated there, in which case, the profits attributable to that PE may be taxed by the state where it is located. Establishing whether a PE exists is therefore the threshold question; everything that follows, how much profit gets attributed to the source state, depends on it.

b.    The Three-Limbed Test

Article 5(1) defines a PE as “a fixed place of business through which the business of an enterprise is wholly or partly carried on.” The OECD Commentary breaks this down into three cumulative requirements:

  • A place of business; some facility, whether or not owned or leased by the enterprise, such as premises, machinery, or equipment, and which the enterprise has “at its disposal.”
  • Fixedness; the place must be geographically identifiable and must exhibit a degree of permanence; a purely transient or intermittent presence generally will not qualify, though there is no fixed minimum time period under the OECD standard itself (some domestic laws and treaties impose their own thresholds, discussed below).
  • Carrying on business through that place; the enterprise’s personnel or automated equipment must actually conduct the enterprise’s business activity there, not merely have a passive presence.

A pipeline satisfies the first two limbs almost by definition: it is a fixed, geographically located piece of infrastructure with obvious permanence. The live question is almost always the third limb and the exceptions carved out under Article 5(4), that is, what kind of business is being carried on through it, and whether that activity is excluded from PE status.

c.     The Article 5(4) Exceptions and Why Pipelines Test Their Limits

Article 5(4) lists activities that, even where conducted through an otherwise-qualifying fixed place of business, are deemed not to create a PE, because they are considered preparatory or auxiliary to the enterprise’s real business. Two of these exceptions are directly relevant to pipelines:

  1. Article 5(4)(a); use of facilities for delivery of goods or merchandise. This exception is available only where the goods or merchandise being delivered belong to the enterprise itself. Where a pipeline operator transports oil or gas that belongs to third-party shippers, this exception does not apply, the operator is not delivering its own goods, it is providing a transportation service for others, which is its core business activity. The OECD Commentary is explicit that a pipeline operator in this position will generally be found to have a PE in every state the pipeline passes through, in respect of that transportation activity.
  2. Article 5(4)(e); activities of a preparatory or auxiliary character. This exception also fails for a third-party pipeline operator, on two grounds: the pipeline is not being used “for the enterprise” in the relevant sense (it is being used to serve other enterprises’ shipments), and transporting the product is the core commercial activity, not something merely preparatory or auxiliary to it.

By contrast, where a pipeline operator uses the same infrastructure to move its own oil or gas through a transit state, Article 5(4)(a) does apply, because the goods being delivered belong to the enterprise itself, and no PE is created purely on the basis of that transit.

The commentary considers the position of a third-party shipper whose product is transported by someone else’s pipeline, and concludes the shipper does not have the pipeline “at its disposal”, it merely pays a tariff to use infrastructure it doesn’t control or occupy, so the shipper itself does not acquire a PE in the transit state through that arrangement.

d.    The Anti-Fragmentation Rule (BEPS Action 7)

Under the OECD/G20 Base Erosion and Profit Shifting (BEPS) project, Action 7 introduced an “anti-fragmentation” rule, now reflected in Article 5(4.1) of the updated OECD MTC. Because activities that look preparatory or auxiliary in isolation can, in substance, add up to a core business function when combined with related activities in the same location, the anti-fragmentation rule denies the Article 5(4) exceptions where an enterprise (or a closely related enterprise) carries on complementary business functions at the same place, or at different places in the same state, that together constitute a cohesive business operation. For pipeline structures involving multiple affiliated entities performing different functions along the same transit corridor, pumping stations, storage terminals, metering facilities, this rule is a reminder that splitting functions across related entities does not automatically avoid PE exposure; tax authorities are entitled to look at the combined substance of the operation.

e.     Construction and Deemed PEs Under Domestic Law

Beyond the general Article 5(1) test, many domestic tax codes, including those of pipeline transit states, contain their own deeming provisions that create a PE automatically once certain thresholds are met, regardless of the general test. Two are particularly relevant to a project like EACOP:

Construction/installation PEs. It is common for domestic law to deem a building site or a construction, assembly, or installation project to be a PE once it has existed beyond a specified period, often six months, though treaties frequently extend this to twelve. During the construction phase of a cross-border pipeline, this provision can create a PE for contractors and subcontractors well before the pipeline itself is operational or before any transportation-related PE analysis under Article 5(4) becomes relevant.

Extractive-activity PEs. Some domestic laws explicitly deem a mine, oil or gas well, quarry, or other place of exploration, extraction, or exploitation of natural resources to constitute a PE outright, without needing to satisfy the general fixed-place-of-business test. Where a pipeline project is bundled with upstream extraction infrastructure, or where its scope extends to wellhead facilities, this kind of deeming provision can trigger PE status on a separate and independent basis from the transportation analysis above.

Both Uganda and Tanzania’s income tax statutes contain PE definitions that track this pattern: a general fixed-place-of-business test aligned with the OECD standard, supplemented by specific deeming provisions covering mines, oil and gas wells, and construction or installation projects exceeding a set duration. This dual structure matters for a project like EACOP, because it means PE exposure can arise on more than one legal basis simultaneously, the general transportation-through-a-fixed-place analysis under Article 5(4), and the domestic deeming provisions triggered independently by construction activity or extraction-adjacent infrastructure.

f.      From “Is There a PE?” to “How Much Profit Is Taxable?”

Once a PE is established, the analysis shifts from existence to quantum: how much of the enterprise’s profit should be attributed to the PE, as distinct from the head office and other parts of the business?

The prevailing international standard is the Authorised OECD Approach (AOA), formalized in the OECD’s 2010 Report on the Attribution of Profits to Permanent Establishments and reflected in the current Article 7. The AOA treats the PE as if it were a distinct and separate enterprise, engaged in the same or similar activities under the same or similar conditions, dealing at arm’s length with the rest of the enterprise of which it is part. Attribution is done through a functional and factual analysis: identifying the significant people functions performed at the PE, the assets used there, and the risks assumed there, and then applying arm’s-length pricing principles, the same methodology used for transfer pricing between related legal entities, to work out what profit the PE would have earned had it genuinely been an independent business.

For a pipeline PE created by third-party transportation activity, this typically means attributing profit by reference to the functions actually performed within the transit state, operating and maintaining that stretch of pipeline, managing metering and pressure control, handling local regulatory and safety compliance, rather than simply pro-rating profit by pipeline length or throughput volume, though such metrics often feature as part of the broader functional and comparability analysis.

Klaus Vogel’s influential commentary on double tax conventions frames the underlying policy goal well: PE rules exist to enable an adequate, workable allocation of profit between source and residence states; in the rare marginal case where allocation would be practically impossible or excessively difficult, that difficulty itself may be an indicator that no PE should be found to exist at all. For a project as large, technically complex, and jurisdictionally split as EACOP, that allocation exercise is unlikely to be marginal, it is central to how Uganda and Tanzania will each realize tax revenue from the pipeline’s operation.

3. Why This Matters for EACOP

EACOP is structured as a single, integrated pipeline company, EACOP Ltd, moving crude oil across two tax jurisdictions, Uganda and Tanzania, toward export at the port of Tanga. That structure sits precisely at the intersection of every principle outlined above:

Where is EACOP Ltd genuinely managed for POEM purposes, and could that create competing residency claims between Kampala and Dodoma (or wherever board decisions are, in substance, made)? Does the pipeline itself create a PE in each host state under Article 5(4), given that it will carry crude oil in which EACOP Ltd itself may hold an economic interest alongside third-party production? Do the construction and extraction-adjacent deeming provisions in Uganda’s and Tanzania’s domestic law create additional, independent PE exposure during the build phase? And once PE status is established, how should the profit from transporting that oil be functionally attributed between the two states, given that pumping stations, storage terminals, and the export terminal itself are not evenly distributed along the route?

These aren’t abstract academic puzzles. They determine, in very concrete terms, how much tax revenue Uganda and Tanzania can each expect to collect from one of East Africa’s largest infrastructure investments, and how much certainty EACOP Ltd itself has about its tax obligations going forward, given that unresolved conflicts of this kind are ultimately what mutual agreement procedures between competent tax authorities, and in the worst case treaty arbitration, exist to resolve.

Part 2 will turn to how these principles apply specifically to EACOP Ltd’s structure and the EACOP Special Provisions Act.

About Alfred Habaasa

Alfred assists companies in resolving complex cross-border commercial disputes, international tax structuring, and developing robust Transfer Pricing defense portfolios within the East African Community. For specialized consulting, reach out to our advisory teams at REDMOND TAX & ADVISORY for Uganda Taxes and TAX IQ Africa for International Tax and Transfer Pricing

Let’s Connect

Would you like to schedule a free 1-hour consultation call/meeting to have a chat on your company’s current URA compliance status?
Call: +256778444143 or Email: inquiries@alfredhabaasa.com

Contact me

Related Posts