I struggle immensely with Avatax. Out-of-Box it may work, but if there are any problems, the support at Avalara is awful. I have experienced this with more then one of my clients/projects. I have successfully setup Sales Tax in NAV without a add-on. Most NAV customers chose an add on for guaranteed accuracy of rates, etc.If I need a add-on for a new project, I will be trying Wolters Kluwer; I have heard good things.
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