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Merge Amazon Seller Central and Shopify Sales Data for Sales Tax Reporting in New Zealand

Sales tax reporting needs order totals broken out consistently by date and location, which rarely matches between two platforms' raw exports. In New Zealand, that also means accounting for GST: GST is a flat 15% once you're registered, with no state/province split needed since it's a single national rate.

Why Amazon Seller Central and Shopify exports don't line up

Amazon Seller Central: a purchase date/time column stamped in UTC, not your local time; item price, promotion discounts, and Amazon referral fees split across several columns; an Amazon Order ID in a long dashed format (e.g. 123-4567890-1234567).
Shopify: a Created At timestamp that includes a timezone offset; a single Total column that already nets out discounts, with tax broken out separately; an order Name like #1001 rather than a numeric ID.

Neither export is built with GST in mind, so getting from "two raw files" to "New Zealand-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 NZD).
Map the Amazon Seller Central export, then the Shopify 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.

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