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arXiv · 2312.00925

Towards a Software Architecture Description for Tax Compliance

Michael Dorner·Oliver Treidler·Tom-Eric Kunz·Ehsan Zabardast·Daniel Mendez·Darja Šmite·Maximilian Capraro·Krzysztof Wnuk
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Abstract

The internal reuse of software components owned by organizational units in different countries constitutes an implicit form of licensing that may be taxable under international regulations, making tax authorities an often overlooked stakeholder in software architecture. This study assesses to what extent a deliberately minimal software architecture description can make implicit cross-border licensing visible and interpretable for tax experts. We define a deliberately minimal architecture viewpoint based on components, dependencies, ownership, and jurisdiction, and construct a view for a large-scale industrial microservice software system comprising 2,518 components and 16,533 dependencies. The resulting architecture description is evaluated in a judgment study with four experienced tax auditors and tax advisors using semi-structured interviews. The results show that the software architecture description provides a structured, evidence-based starting point for identifying cross-border reuse and supports tax audit discussions. However, experts consistently report limitations, including mismatches between software engineering and legal notions of ownership, unclear jurisdictional assignments, and the perceived risk of interpreting dependency counts as indicators of economic value. These limitations persist despite detailed architectural data. We conclude that software architecture descriptions can expose structurally relevant reuse relationships but cannot, on their own, support the legally meaningful interpretations required for tax assessment, indicating a fundamental mismatch between architectural abstractions and taxation concepts.

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Michael Dorner, Oliver Treidler, Tom-Eric Kunz, Ehsan Zabardast, Daniel Mendez, Darja Šmite, Maximilian Capraro, Krzysztof Wnuk. 2023-12-01. Towards a Software Architecture Description for Tax Compliance. https://arxiv.org/abs/2312.00925

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