How the Role of the Tax Professional Changes with the Addition of an Online Marketplace

Online marketplaces are growing fast. By 2027, they are projected to drive 59% of global ecommerce sales. Retailers of all sizes are jumping in.

What changes when a marketplace goes live

When your organization adds a marketplace, your scope expands immediately. You are no longer responsible only for your own products. Every item a third-party seller lists on your platform becomes part of your taxability picture. That could mean thousands or even millions of new SKUs, each with its own rules depending on ingredients, category, and the jurisdiction where the sale occurs.

Five challenges worth knowing before you launch

First, managing a much larger product inventory requires close coordination with your IT and marketplace operations teams. Sellers must submit detailed product data.

Second, sellers become a new kind of client. Your tax department plays a direct role in their compliance. They depend on you to provide accurate, timely transaction data every month so they can meet their own reporting obligations.

Third, tax liability in a marketplace is rarely clean. Marketplace facilitator laws generally cover state sales tax, but county, local, and special product taxes often remain open to interpretation. A single sale can carry multiple line items with liability split between you and the seller.

Fourth, state requirements vary and move quickly. Some states give marketplaces as few as three days to verify third-party seller information before a non-compliance finding. Keeping up with these rules takes real attention.

Fifth, international sales add another layer. In a VAT environment, you may need to produce two separate invoices per transaction.

How to prepare your team

Tax should have a seat at the table from the start. Organizations that bring tax professionals in late often find themselves scrambling.

Building a clear seller onboarding process also matters. Sellers evaluate your marketplace on more than fees. A smooth, well-organized experience.

Finally, tax technology can remove a significant burden from your team. Automated solutions apply up-to-date rates and rules, determine liability, and generate reporting outputs without manual effort.

Marketplace tax is complex, but it is manageable with the right preparation, the right partners, and the right tools.