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Numeral calculates sales tax for your WooCommerce store in real time at checkout. Instead of maintaining tax tables across states and jurisdictions, you install the Numeral plugin, connect it with an API key, and Numeral applies the correct rate to every order and syncs transactions back for compliance. Before you begin, make sure you have:
  • Admin access to your WordPress / WooCommerce site
  • A Numeral account and an API key
  • No other tax providers active on the store (Numeral handles all tax calculation, and other tax plugins will conflict)

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Install and connect the plugin

  1. Download the Numeral WooCommerce plugin.
  2. In WordPress Admin, go to Plugins → Add New → Upload Plugin, upload the ZIP, click Install Now, then Activate.
  3. Go to WooCommerce → Settings → Tax → Numeral.
  4. Paste your API key and click Save changes.
  5. Click Test Connection — you should see “Connected to Numeral” with a green checkmark.
Start in Sandbox with a test key (sk_test_…) to verify your setup, then switch the Environment to Production and swap in a production key (sk_prod_…) when you’re ready to go live.
Once enabled, Numeral calculates tax on every order in real time and syncs completed orders and refunds to your dashboard automatically.

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How to generate data for Nexus Detection with Numeral

If you want to run a nexus study, you can use the Numeral plugin to export your historical WooCommerce orders and upload them to Numeral as a one-time manual data upload — no full integration required.
  1. Install the Numeral plugin on your WordPress / WooCommerce site, following the steps above. Make sure no other tax providers are active.
  2. Open the Numeral page inside WooCommerce. The plugin has its own tab under WooCommerce → Settings → Tax → Numeral.
  3. Export a CSV from that page, selecting a date range that goes back as far as you need for the nexus study.
  4. Upload the CSV to Numeral. It goes in just like a standard manual data upload.
Once you’ve exported the CSV and uploaded it to Numeral, it’s safe to delete the plugin if you only installed it for the nexus study. Your exported data stays in Numeral.