Adding US sales tax to WooCommerce couldn’t be easier with their one-click import system that’s built in to the WooCommerce plugin core. Once you’ve downloaded our CSV (and this applies to any WooCommerce tax rates CSV file), head on over to your WC settings in the backend of your site and head to Tax –> Standard rates. There you will find the button to “import CSV”. That’s it. Boom!
1) Go to WooCommerce -> Settings -> Tax -> Standard Rates
2) Click on the “Import CSV” button
3) Select the CSV file that you want to upload
4) Click on “import”.