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.

Home › Merge Guides › TikTok Shop + Wayfair › Quarterly Tax Estimates walkthrough

The Best Way to Merge TikTok Shop and Wayfair Data for Quarterly Tax Estimates

If you're doing quarterly tax estimates by hand right now, here's the fastest path from "two exports" to "one usable sheet," and why the manual version keeps breaking.

Step by step

Decide your target columns once. Most people settle on Date, Channel, Order ID, and Total — set that up in CSV Experts and you won't redo it.
Import the TikTok Shop file first. The first time you see this file shape, you map each of its columns to your target list.
Import the Wayfair file the same way. Its columns get mapped once too — after that, every future file with this shape merges with no extra clicks.
Check the merged totals. Dates and numbers are normalized automatically, so a European "24,00" and a US "24.00" both land as the same value.
Export. CSV or Excel, ready for quarterly tax estimates.

What actually goes wrong if you do this by hand

TikTok Shop gives you an order creation time stamped in UTC, while Wayfair gives you a purchase order date distinct from the ship date required by Wayfair's supplier terms — line those up manually across a few hundred rows and it's easy to miscount a week. On top of that, TikTok Shop's export refunded and partially-refunded orders stay in the export with a status column instead of being removed, so totals can overstate revenue if you don't filter by status, and Wayfair's built for suppliers rather than direct-to-consumer sellers, so column names lean toward logistics (PO, ship window) rather than retail checkout fields. Individually those are minor quirks; combined into one spreadsheet by hand, they're where most reconciliation errors for quarterly tax estimates actually come from.

Why it matters for quarterly tax estimates

Quarterly estimated tax payments depend on knowing real revenue across every channel, not just the platform that's easiest to check.

Try it with your own files →

Just want the quick column-difference reference instead? See the short version.

Related walkthroughs

← Back to CSV Experts