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The Best Way to Merge TikTok Shop and Mercari Data for Sales Tax Reporting
If you're doing sales tax reporting 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 Mercari 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 sales tax reporting.
What actually goes wrong if you do this by hand
TikTok Shop gives you an order creation time stamped in UTC, while Mercari gives you a sold date in the seller's local time — 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 Mercari's like other reseller apps, the export is minimal with no tax breakdown and mixes cancelled orders into the same file. Individually those are minor quirks; combined into one spreadsheet by hand, they're where most reconciliation errors for sales tax reporting actually come from.
Why it matters for sales tax reporting
Sales tax reporting needs order totals broken out consistently by date and location, which rarely matches between two platforms' raw exports.
Just want the quick column-difference reference instead? See the short version.