TaxJar is the leading technology solution for busy eCommerce sellers to manage sales tax, and is trusted by more than 20,000 businesses.
TaxJar provides full service sales tax calculations + reporting + filing, all-in-one. Once you've synced up to TaxJar, you’ll see your sales tax collected by city and county, across all states and all the platforms you sell on.
Please find more informartion about how to install plugins here.
The plugin is provided absolutely for free and includes source code. Find the project Github repository here.
UPDATE: nopCommerce team doesn't plan to upgrade this plugin to the latest version. Our community is more than welcome to continue development of the plugin. Please feel free to use our source code.