From the Configuration Menu, click Taxes → Tax By Post Code
On this page, store admins can set up tax rates based on the zip code the customer registers with. Taxes can also be based on the state or the country customers specify.
NOTE: If multiple levels of taxes are set up (ie state and zip code), the customer will be charged the cumulative amount.
To change the tax rates for a zip code, click the Edit button next to the line you wish to edit, enter the desired values for each column, and click Update to save the changes.
Adding a Zip Code
The store does not come preloaded with any zipcodes. To add a zip code to charge taxes in, simply click 'Add New' and fill in the required fields.