PwC and Siemens Energy: A connected approach to global tax compliance

Siemens Energy, a global leader in energy technology with more than 100,000 employees across 90+ countries, established a global tax function to support its operations. To achieve this, the group adopted a strategic approach that balanced strong internal tax expertise with carefully selected external support, ensuring agility, compliance, and value creation across diverse markets.

With nearly 300 entities worldwide, Siemens Energy needed a model that would bring clarity, consistency and immediate insight across jurisdictions, while remaining flexible to changes in the organisation and its governance structure.

The journey towards transformation began with a shared ambition. Siemens Energy and PwC found common ground in their vision for a connected, resilient tax function, one that could keep pace with the company’s global scale and complexity. 

The transformation began with a clear and practical goal: create a unified compliance model capable of serving nearly 300 entities across 90+ jurisdictions without disrupting business‑critical processes. To deliver this at scale, PwC mobilised a multi‑territory delivery team spanning Germany and Spain, bringing both deep local knowledge and coordinated global governance.

At the core of the rollout were PwC’s cross‑border transition managers, who applied a proven transition methodology to migrate Siemens Energy’s portfolio into PwC’s managed services Connected Tax Compliance model. This included mapping legacy workflows, identifying critical data owners, aligning entity‑level timelines, and establishing standardised processes that could be deployed consistently across countries, ensuring the global transition kept pace while maintaining a stable compliance cadence.

A central Client Relationship Management (CRM) team, led by PwC Germany with support from PwC Spain, acted as the single coordinating hub, managing governance changes, aligning territory leads, and ensuring that communication remained streamlined.

Together, Siemens Energy and PwC co‑developed a technology roadmap, which assessed in‑house capabilities alongside PwC Sightline, an AI powered tax technology platform that standardises workflows, embeds robust controls and audit trails, and provides real-time visibility for both Siemens Energy and PwC teams. This allowed Siemens Energy to replace manual reconciliations, introduce digital audit trails, and create connected data flows between global markets and tax teams. Demonstrating this alternative “future‑state” model early in the journey helped build confidence in the shift to a more modern, scalable operating approach.

Beyond technology, the working relationship was built on trust and transparency. PwC’s Connected Tax Compliance approach brought together advanced technology, robust data and global expertise to create an integrated, end-to-end experience.

As the approach matured, the collaboration naturally broadened into specialised areas of tax.

Our Connected Tax Compliance model enabled Siemens Energy to enhance its global compliance operations while strengthening alignment, transparency and efficiency across jurisdictions. This reflects PwC’s wider Managed Services portfolio, where critical operations are delivered through scalable, technology‑enabled services that combine technology, expertise, robust governance and consistent execution.

Global visibility and oversight

Siemens Energy gained clearer, real-time visibility across its global compliance activities through PwC Sightline’s reporting environment. By creating a unified view of progress and status across nearly 300 entities in 90+ countries, Siemens Energy was able to monitor workflows more consistently and build greater trust in the underlying data without altering how its tax responsibilities are distributed across markets.

Efficiency and productivity gains

The use of PwC’s cross border transition managers and globally standardised process templates supported smoother onboarding and higher process stability across jurisdictions. Automated audit trails, enhanced data extraction routines and connected workflows helped reduce manual effort and limit time spent reconciling local variations, enabling Siemens Energy to focus more time on higher value activities while maintaining quality.

A broader strategic relationship

The collaboration naturally evolved beyond compliance delivery into a wider strategic partnership. With PwC Germany and Spain leading the engagement, Siemens Energy expanded the scope to include transfer pricing, tax litigation and M&A advisory — supported by PwC’s global network and consistent delivery model.

Prepared for future regulatory change

PwC’s Connected Tax Compliance approach has positioned Siemens Energy to respond confidently to evolving global requirements, including broader governance expectations. The strengthened model provides a stable foundation for Siemens Energy as it continues to adapt its tax operations to meet future regulatory demands.