The Future of Tax Control: Between Regulation and Reality
The release of the CIAT Practice Principles for Continuous Transaction Controls (CTCs) is an important milestone in the global shift from subjective tax declarations to objective, real-time observation. As we move toward a world where transactions are validated as they happen, the dialogue between tax administrations and the private sector has never been more critical.
The Rise of the 5-Corner Model & The Interoperability Revolution
One of the most significant changes highlighted by CIAT is the emerging preference for interoperability models that integrate tax control with streamlined business operations. Specifically, the 5-corner model exemplifies how tax compliance can be combined with modern business automation.
I believe this shift will eventually force countries with established, rigid CTC systems to re-engineer their models to accommodate this new standard of interoperability. A prime example of this evolution is the United Arab Emirates, which is set to be the first to implement a complete 5-corner model in an obligatory manner.
At Comarch, we appreciate solutions that embrace harmonization, such as our ViDA-ready approach, but also support any other model that may be highly country-specific. As for the EU, by leveraging European EN16931-compliant formats, we enable cross-border exchange with a one-time setup, ensuring that as more countries adopt these standards, our clients can expand without constant technical adjustments required on their side.
The Integration of Transactional Documents into Broader Regulatory Frameworks
CIAT suggests that CTC frameworks should expand to include sustainability reporting, transport documents, and payment confirmations. While this may sound ambitious, many administrations are already proving their technical capability:
- Turkey successfully manages both e-invoicing and e-dispatch.
- France is integrating e-invoicing with e-reporting and payment information.
- Romania and Bulgaria have paired e-transport with e-invoice obligations.
- Italy uses mandatory e-invoicing and sector-specific e-order obligation.
The challenge isn't the technology, but the administrative silos. Often, different government bodies oversee different documents, leading to a failure to reuse existing IT architecture. This results in a significant loss of taxpayer money and a missed opportunity for true “objective tax control”.
Implementation Timelines and the Mitigation of Non-Tariff Trade Barriers
While CIAT recommends a realistic 12-18 month implementation timeline, the reality on the ground is often much more stressful. Sometimes governments to publish technical requirements just days before an obligation begins, such as in Croatia, where changes were published on December 18th for a January 1st deadline.
For businesses, this lack of proportionality forces a sudden redirection of resources, often pulling experts away from critical projects like ERP migrations. Moreover, we still see “non-tariff barriers” in the form of local certification requirements that create market oligopolies. In some jurisdictions, only a handful of providers are certified, and the government is slow to certify more of them, which stifles competition and innovation.
The Path Forward: Data Accessibility Over Localization
The CIAT principles advocate for minimizing sovereign cloud and data localization requirements to reduce trade friction. We are seeing a positive trend where some authorities are prioritizing data accessibility over physical residence. The UAE's Ministry of Finance, for instance, requires accredited providers to ensure 24/7 data availability without mandating local data centers.
As we look to the future, the role of the tax auditor will remain essential. Even as data collection becomes automated, auditors must still cross-check invoices against the entire supply chain: orders, delivery notes, and receipts.
The transition to CTCs is a marathon, not a sprint. By following the CIAT principles of openness, proportionality, and harmonization, governments can ensure that digitalization serves as a bridge to economic growth rather than a barrier to business continuity.
Paula Müller
Senior Consultant & Solution Lead at Comarch E-Invoicing
