You can access the "States/Tax" page by clicking the left side "States/Tax" link under "Inventory".

Or you can click the "States/Tax" icon on the main page of your personal administration area.

Configuring State Sales Tax:

Choose the state or states that you wish to charge sales tax and configure one or more of the following fields:

Tax(flat)
This field allows you to specify a flat dollar amount. When a customer (who resides in the state that you configure), buys one or more of your product, they will be charged a flat dollar amount in tax from the amount that you specify.

Tax(%)
This field allows you to configure a percentage value (most common). Most states require a specific percentage of the sale to be taxed when the seller (or company) resides or is based within the state. When a customer (who resides in the state that you configure), buys one or more of your product, they will be charged a percentage in tax from the amount that you specify.

Tax Shipping
If you need to also tax shipping, you may do so by ticking the checkbox.

GST(%)
This field allows you to specify Canadian GST percentage values for Canadian based sales.

PST(%)
This field allows you to specify Canadian PST percentage values for Canadian based sales.

Once you have entered values for the state or states that you wish to charge sales tax, scroll to the bottom of the page and press the "Update" button to save your settings.