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Merge WooCommerce and BigCommerce Sales Data for Sales Tax Reporting in the United States

Sales tax reporting needs order totals broken out consistently by date and location, which rarely matches between two platforms' raw exports. 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 WooCommerce and BigCommerce exports don't line up

WooCommerce: an Order Date in whatever format your WordPress site's locale is set to; an Order Total that depends entirely on which tax/shipping plugins are installed; a plain numeric Order Number.
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.

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 WooCommerce export, then the BigCommerce 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.

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