If you already know a tax expert or you already know the tax rates, then it isn't too much of a pain to enter the tax rates manually. But if you don't know a tax expert, then it's a bit of work and it's probably cheaper and faster to use a third-party tool to calculate the tax rates for you.
One such tool that's geared for US businesses is TaxJar.
Using the following steps, we first download the free TaxJar plugin from WordPress.org:
In the WordPress admin, click on the Plugins menu and then on Add New.
Run a search for the
TaxJar - Sales Tax Automation for WooCommerceplugin.Install and activate the plugin.
Now that we have the plugin installed, we have to configure it.
From the WordPress admin, go to WooCommerce | Settings | Integrations.
If TaxJar is the only integration you've installed, it will automatically be loaded. Otherwise, click...