Five Key International Tax Compliance Strategies in a Globalized Landscape

The following is a guest article by Michael Bernard, Chief Tax Officer at Vertex. This article reflects the author's personal views only.

While U.S. corporate boards celebrate potential domestic tax relief policies, such as persistently lower corporate tax rates and provisions encouraging domestic manufacturing, CFOs focused on international expansion must confront rapidly evolving digital tax rules. Governments worldwide are actively advancing electronic invoicing mandates, updating VAT frameworks, and implementing "economic nexus" rules—which can trigger tax obligations based solely on sales volume, even without a physical presence in the jurisdiction.

Given these complexities, integrating VAT and digital tax initiatives into global growth strategies has become imperative. Failure to keep pace with these requirements may expose companies to penalties, interest charges, and reputational risks that erode revenue and competitive standing. To address these challenges, here are five practical priorities for U.S. companies expanding into global markets.

1. Build In-House VAT Expertise or Choose Reliable Outsourcing

Unlike the fragmented system of U.S. state, city, and county tax compliance requirements, Europe's VAT framework is guided by central EU directives, yet significant differences remain among countries. For companies seeking overseas expansion, localized knowledge is crucial due to varying jurisdictional requirements. In practice, companies can choose between two paths:

• Build a local team: Hire professionals locally in the target market who are familiar with registration thresholds, invoice formats, and filing deadlines. These employees bring first-hand experience through their command of the local language, understanding of evolving policy interpretations, and familiarity with audit practices.
• Outsource to a specialized accounting firm: Partner with a reputable firm to manage cross-border VAT obligations across multiple countries. This option may be more cost-effective for companies entering several jurisdictions simultaneously, provided the firm has a reliable track record of timely filings and proficiency with government portals.

Both approaches carry risks: internal teams require continuous training as regulations evolve, while external partners depend on receiving timely and accurate data. Regardless of the path chosen, integrating VAT initiatives into global growth strategies demands dedicated resources and board-level attention.

2. Ensure Smooth Data Flow for Outsourced VAT Compliance

When outsourcing VAT compliance work, finance teams must maintain robust internal processes to provide detailed, timely, and accurate transaction data. Whether the data originates from U.S. headquarters or European contact points, outsourcing providers rely on the following elements:

• Comprehensive data: Including information such as product descriptions, net value, VAT rates, customer locations, and supply chain flows.
• Timely data transmission: Meeting monthly or quarterly filing deadlines, especially in jurisdictions with shorter filing windows.
• Data quality control: Reconciling enterprise resource planning (ERP) records with local invoices to avoid discrepancies that could trigger audits.

Even the most capable external partner cannot fulfill VAT obligations without the necessary data. CFOs should ensure finance, tax, and IT teams collaborate to establish clear data ownership models and deploy automated pipelines wherever possible.

Alarmingly, Vertex's global survey reveals that only about half of global finance teams have automated core processes and indirect tax workflows. This leaves many organizations vulnerable to manual errors and compliance gaps when handling multi-jurisdictional VAT filings. Without the right data infrastructure and ownership arrangements, companies may face risks and penalties that can quickly erode profits.

3. Beware of EU "Wayfair-Style" Economic Nexus Rules

In 2018, the U.S. Supreme Court's Wayfair decision upended sales tax obligations for remote sellers. Since then, several European countries have followed suit by introducing VAT "economic nexus" thresholds. In effect, even without a local office or warehouse, exceeding specific sales thresholds may trigger registration obligations. Therefore:

• Non-resident companies may require VAT registration: Even without local facilities, companies exceeding annual turnover thresholds must register for VAT.
• Thresholds vary by jurisdiction: For example, France, Spain, Germany, and Poland each set different registration limits and reporting formats.
• Digital services and e-commerce under scrutiny: Web-based subscription models or online marketplaces face stricter review because they generate sales and can trigger local VAT obligations.

CFOs should conduct "what-if" economic nexus assessments before entering or expanding into each market, including comparing projected revenue against local thresholds and flagging potential risks. Companies need to evaluate under what circumstances their digital or remote operations might create registration requirements, as delayed or missed registration can lead to retroactive assessments and interest charges.

4. Prepare for Non-Uniform Reporting Requirements Across Countries

Although the EU VAT system is based on overarching directives, the implementation of reporting obligations remains highly fragmented. For example:

• Similar data foundations, but differing details: Nearly all European jurisdictions require invoice data fields such as product classification, destination country, net value, and applicable tax rate, but each country implements its own schemes, business rules, or formats (as shown below).
• Country-specific requirements may vary: Italy may mandate the inclusion of Intrastat codes (eight-digit codes for goods declarations) or digital signatures on invoices, while Poland requires unique invoice numbering sequences and supplementary summary declarations.
• Different reporting formats: Some countries still accept the XML format of the Standard Audit File for Tax (SAF-T), while others have shifted to proprietary e-invoicing formats to support real-time updates.

A recent Vertex survey found that 82% of U.S. companies reported that e-invoicing improved overall financial health, enhancing data accuracy and international competitiveness—but only when systems are tailored to each market's specifications. A one-size-fits-all approach inevitably leads to gaps.

Finance teams need to map out each jurisdiction's specific requirements and establish parallel reporting pipelines or customized ERP outputs to ensure compliance. Failing to meet cross-border requirements can result in penalties and interest charges, impacting revenue and competitive position. To address this challenge, companies should centralize compliance platforms that support multi-jurisdictional template libraries, reducing manual intervention and error rates.

5. Prepare for Phased Implementation of Mandatory E-Invoicing

The EU's "VAT in the Digital Age" (ViDA) initiative has driven the transition toward mandatory e-invoicing, but implementation will proceed gradually over several years. According to recent EU announcements, some member states will enforce e-invoicing requirements as early as January 2026, with others following in June 2026 or January 2027. To prepare, companies must:

• Plan a phased implementation strategy: Identify which countries are in the first wave (e.g., Italy, France) and which are in subsequent waves (e.g., Spain, Poland), and prioritize system upgrades accordingly.
• Confirm systems are flexible and scalable: Legacy ERP platforms may lack native e-invoicing modules. CFOs should evaluate add-on solutions or cloud platforms to accommodate evolving formats and real-time invoice reporting.
• Coordinate cross-departmental collaboration: Finance, tax, IT, and treasury departments need to work together to interface with local portals, digital signature requirements, and archiving regulations.

A piecemeal approach can lead to non-compliance and missed deadlines. Phased planning provides time to identify which countries go live when, ensuring teams have ample time to test, train, and validate processes before mandatory implementation dates.

Ultimately, CFOs leading U.S. companies into global markets must engage in forward-looking strategic planning to navigate the convergence of digital tax policies. Domestic tax relief may free up cash flow, but ignoring overseas digital VAT rules can quickly erode profits. CFOs and their teams should proactively elevate VAT compliance from a back-office activity to a board-level priority—an issue that intersects with technology, data governance, and broader operational strategy.

With more than 80 countries raising VAT rates annually and new e-invoicing mandates emerging constantly, the only path to sustaining profitability and reputation in global markets lies in embedding digital tax readiness into the strategic blueprint.