Automated Indirect Tax Determination and Reporting from Inside the ERP

Why ERPs alone aren't enough for indirect tax

ERP platforms are the backbone of enterprise finance, but their native tax capabilities are limited. Most handle only basic rate tables for tangible goods, require manual maintenance, and lack the depth to manage complex exemptions. That gap creates real risk: audit exposure, human error, and staff hours spent on compliance tasks that should be automated.

The scale of the problem

Indirect tax is not static. In the second half of 2022 alone, 77 new tax laws took effect in the U.S., and 255 changes were made to existing laws. Across more than 15,000 state and local jurisdictions, rates, rules, and exemptions shift constantly. Managing that manually is not just inefficient. It is nearly impossible. And when errors occur across hundreds or thousands of transactions, even small miscalculations add up fast.

Exemptions add another layer of complexity

Exemptions are especially difficult to manage. The burden of proof falls on the seller. Different states require different documentation for different exemptions across different industries, and those documents expire. Without a system to track and renew them, audit exposure grows quickly.

How Vertex and Workday work together

Vertex integrates directly into Workday Financial Management, adding automated tax calculation at any point in the supplier or customer invoice workflow. The integration is cloud-based, scales easily, and places minimal burden on IT teams. With alliance partner KPMG supporting deployment, the setup is customized to each organization's specific needs.

Once integrated, Vertex calculates indirect tax using multiple factors: revenue category, sales item, ship-to address, and cost center. Results are displayed at the line level by rate and jurisdiction. The solution also self-assesses taxes paid to suppliers, so buyers can confirm they are paying the correct amount.

Tax content that works at scale

Vertex maintains more than 700 million ready-made, up-to-date, data-driven rules, covering not just North America, but also Latin America and EMEA. Rules update in real time, so your team never has to research tax law changes or build rate tables manually. And because the rules are customizable, you are never locked into a fixed configuration.

The result is a fully automated indirect tax process. Calculation, exemption management, reporting, and audit documentation are all handled from within Workday. Tax friction disappears from the buying experience, compliance becomes systematic, and your organization is better positioned to expand into new regions without tax complexity slowing you down.