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Merge Amazon Seller Central and Squarespace 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 Amazon Seller Central and Squarespace 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).
Squarespace: a Date column in ISO-like format; Subtotal, Discount, Shipping, and Total as separate columns; an Order ID that's a short alphanumeric code.

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 Amazon Seller Central export, then the Squarespace export — each file shape is remembered after the first time.
Export the merged sheet and apply your sales tax treatment to the combined total.

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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 Amazon Seller Central + Squarespace

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