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Merge BigCommerce and TikTok Shop Sales Data for Tax Prep in Australia

At tax time you need total revenue by channel without hand-fixing each export's columns first. In Australia, that also means accounting for GST: GST is a flat 10% once you're registered, but is only owed above the annual registration threshold.

Why BigCommerce and TikTok Shop 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.
TikTok Shop: an order creation time stamped in UTC; order amount, platform commission, and affiliate commission split into separate columns; a long numeric Order ID.

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

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