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Merge BigCommerce and Wix Sales Data for Sales Tax Reporting in the United Kingdom

Sales tax reporting needs order totals broken out consistently by date and location, which rarely matches between two platforms' raw exports. In the United Kingdom, that also means accounting for VAT: VAT is charged at a flat 20% standard rate once you're registered, and HMRC expects consistent digital records under Making Tax Digital.

Why BigCommerce and Wix 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.
Wix: a Date Created column; a Total column with tax handling that varies by store region; an Order # formatted as a short number.

Neither export is built with VAT in mind, so getting from "two raw files" to "the United Kingdom-ready numbers" means normalizing dates/totals first, then applying your own VAT 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 GBP).
Map the BigCommerce export, then the Wix export — each file shape is remembered after the first time.
Export the merged sheet and apply your VAT 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 + Wix

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