Tax Transformation’s New and Improved Playbook

Why the old playbook no longer works

Indirect tax teams face more pressure than ever. U.S. sales tax rate changes hit a 10-year high in 2023. VAT rules are shifting across Europe. E-invoicing mandates are spreading globally. Manual processes and native ERP tax functionality are struggling to keep up. A new approach to tax transformation is needed. This white paper, developed with Grant Thornton LLP, lays it out.

Tax engines vs. ERP: Making the right call

When evaluating your compliance automation, the core question is whether native ERP tax functionality is enough, or whether a purpose-built tax engine is the better fit. The answer depends on several factors: the scope of your tax content, how well your system handles cross-border transactions, your reporting requirements, and how the system scales as your business grows into new geographies and channels. Tax engines offer automatic rate and rules updates, standardized controls across all source systems, and end-to-end support for calculations, compliance, and reporting. These are capabilities that ERP tax modules often cannot match at scale.

Lessons from a 50-plus country implementation

A large global implementation of the Vertex tax engine, led by Grant Thornton experts, offers a clear picture of what success looks like in practice. Key factors included building a compelling business case with specific ROI estimates, securing buy-in from local controllers in each country, and documenting detailed, location-specific tax requirements upfront. Careful attention to master data (registration numbers, addresses, product codes) and extensive scenario testing were equally critical. Constant collaboration across tax, IT, and order-to-cash teams kept the project aligned from planning through rollout. After go-live, periodic health checks on the tax engine configuration help teams stay ahead of tax law changes and business shifts.

From compliance function to strategic asset

A completed implementation is a starting point, not a finish line. Automating manual compliance work frees your tax team to pursue higher-value activities: identifying tax credits and incentives tied to business expansion, supporting entry into new markets, restructuring large transactions to reduce tax liabilities, and applying tax data analytics to generate insights that improve outcomes across the business. A well-configured tax engine also strengthens business agility. When you expand into a new geography, tax content is already in place so revenue can flow immediately.

Building the business case

A strong ROI-focused business case for tax engine deployment covers time savings from process automation, cost reductions from fewer manual updates, risk reduction through stronger audit defense, and revenue enablement from faster geographic and product expansion. Together, these elements make a clear, quantifiable argument for investment and help secure support from executive leadership and the board.

Tax transformation is a journey. With the right leading practices and a purpose-built global tax engine, your team can move from managing risk to driving real business value.