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The Best Way to Merge Poshmark and Facebook Marketplace Data for Year-End Sales Summary

If you're doing year-end sales summary 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

  1. 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.
  2. Import the Poshmark file first. The first time you see this file shape, you map each of its columns to your target list.
  3. Import the Facebook Marketplace file the same way. Its columns get mapped once too — after that, every future file with this shape merges with no extra clicks.
  4. 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.
  5. Export. CSV or Excel, ready for year-end sales summary.

What actually goes wrong if you do this by hand

Poshmark gives you a sale date in the seller's local time, while Facebook Marketplace gives you an order date recorded through Meta's commerce backend — line those up manually across a few hundred rows and it's easy to miscount a week. On top of that, Poshmark's export the export is aimed at individual resellers, so it has far fewer columns than the bigger platforms and no shipping/tax breakdown, and Facebook Marketplace's many sellers use Marketplace only for listings with no built-in checkout, so exports may only exist via a connected store's own platform. Individually those are minor quirks; combined into one spreadsheet by hand, they're where most reconciliation errors for year-end sales summary actually come from.

Why it matters for year-end sales summary

A year-end summary across channels means twelve months of exports from each platform, all needing the same cleanup before they can be totalled together.

Try it with your own files →

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

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