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Merge BigCommerce and Walmart Marketplace Sales Data for Tax Prep in the United States

At tax time you need total revenue by channel without hand-fixing each export's columns first. In the United States, that also means accounting for sales tax: sales tax is charged per state, and whether you owe it in a given state depends on your economic nexus there — total revenue by state matters more than total revenue alone.

Why BigCommerce and Walmart Marketplace exports don't line up

BigCommerce: an Order Date column that includes a full timestamp; Subtotal and Grand Total both included, which are easy to mix up when mapping; a numeric Order ID.
Walmart Marketplace: an Order Date column separate from the ship-by date; item price and a separate Walmart referral fee; a numeric Purchase Order ID.

Neither export is built with sales tax in mind, so getting from "two raw files" to "the United States-ready numbers" means normalizing dates/totals first, then applying your own sales tax treatment on top of the merged total — not per platform separately.

How to merge them

Set your target columns once in CSV Experts (Date, Channel, Order ID, Total, and a Currency column if you sell in more than USD).
Map the BigCommerce export, then the Walmart Marketplace export — each file shape is remembered after the first time.
Export the merged sheet and apply your sales tax treatment to the combined total.

Merge your files now →

FAQ

Does this upload my sales data anywhere?

No. Everything runs in your browser using JavaScript — your files are never sent to a server.

Does it work for more than two channels?

Yes. Add as many source files as you want; each distinct file layout is mapped once and remembered.

Other countries for BigCommerce + Walmart Marketplace

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