Based on the recent Supreme court decision –I suspect this will be happening in a lot more states soon. That will be very good news for sellers.
Based on changes to Iowa and Alabama State tax law, Amazon will begin calculating, collecting, and remitting sales and use tax for all orders shipped to customers in Iowa and Alabama on January 1, 2019.
Your existing tax calculation settings, order details, and payments reporting will update automatically to reflect this change. No action to your tax settings or seller account is required.
Answers to common questions are available in the Marketplace Tax Collection FAQ. Consider working with your tax advisor to determine any ongoing tax remittance and reporting obligations your business might have.
For more information from Iowa, see this page.
For more information from Alabama, refer here.