The Power of One: A New Formula for Addressing Retail Tax Challenges

Retail tax compliance keeps getting harder. More sales channels, more tax rules, more exemption certificates, more legislative changes: the list grows every year. For retailers managing sales and use tax, VAT, or GST across online and in-store channels, keeping up requires more than manual effort.

Why fragmented systems make tax harder

Most retailers operate with separate teams and systems for online and in-store sales. That fragmentation slows the flow of transactional data to finance, accounting, and tax groups, sometimes leaving tax teams out of the loop until after a new capability goes live. The result: costly rework, audit exposure, and compliance gaps that affect the customer experience.

Three forces driving retail tax complexity

This white paper organizes the retail compliance challenge into three areas. First, changing consumer behaviors (curbside pickup, BOPIS, BORIS, and e-commerce growth) make tax determinations more complex. Second, legislative and jurisdictional changes arrive constantly: VAT reform in the EU, new retail delivery and environmental fees in the U.S., evolving marketplace facilitator laws, and a surge in state sales tax exemptions. Third, strategic business initiatives like geographic expansion, new product lines, and cloud migrations each carry their own tax compliance implications.

A unified approach built on three partners

The solution the white paper makes a case for is a unified commerce capability powered by Shopify, integrated with the Vertex tax engine, and implemented with support from EY. Shopify helps retailers bring online and in-store channels onto a single platform. Vertex keeps tax calculations accurate and scalable as business grows. EY brings implementation discipline, prioritizing requirements-gathering, thorough testing, and the right balance of tax and IT decision-making.

What strong implementation actually looks like

Getting the most from this investment means involving tax teams early. Their input during implementation reduces costly fixes after launch. EY's approach also emphasizes understanding business processes across all stakeholder groups, conducting comprehensive requirements gathering, and testing extensively before go-live. Finding issues during testing is not a setback. It is how you reduce rework, audit risk, and compliance errors down the road.

Measuring what matters after launch

Post-launch, project teams should monitor KPIs tied to tax engine accuracy, data quality, error rates, and customer experience, alongside e-commerce metrics like business growth and time to market. Agreeing on the right measures upfront helps commerce, tax, finance, and IT teams stay aligned on what success looks like.