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Merge Etsy and Amazon Seller Central Sales Data for Tax Prep in New Zealand

At tax time you need total revenue by channel without hand-fixing each export's columns first. 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 Etsy and Amazon Seller Central exports don't line up

Etsy: Sale Date, usually already in your local timezone; Item Total, Shipping, and Etsy fees as separate columns, before tax; a numeric Order ID shared by every item in the same order.
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).

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 Etsy export, then the Amazon Seller Central 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 Etsy + Amazon Seller Central

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