Welcome to the FAQ. Find answers to the questions other people are asking. Type something into the search bar if you can't find what you're looking for. AvaTax for Microsoft Dynamics NAV 2009 is sunsetted and no longer supported by Avalara as of April 30, 2016. If you are using a version affected by service discontinuation and want to maintain access to Avalara Support, you’ll need to upgrade to the latest version of the integration.