Overall - To start i normally don't leave reviews good or bad. We just finished our first year trial. It stopped working a few weeks ago prior to the trial ending.They canceled our subscription to try and fix it, now i have a quote on my desk with a hefty activation charge. Also for any one using the pick up instore feature of BC, avalara will calculate tax based on the ship to address which the customer puts their own address in, but dont worry, they can create a rule for you. When the shipping method line is blank they will base tax on the ship from address. All for a onetime 5k fee. Seems to me BC offers instore pickup and avalara sees the item isnt shipping. One of the two should have this fixed. All in all it worked great at first. Setup was a little confusing. I tried to sign up for the file returns for me service, paid and never could get it to work. it said i had to upload a form but in the drop down box of forms there was not a form for my state. The support i have had has been terrible. Like i said, down two weeks or more and i have talked to about 6 different people who keep marking the cases solved. I think this service is a must for ecommerce but not sure if there is a better one out there.

Essential for collecting tax at scale, but beware of API Calls and Pricing - As others have noted this app requires an expert user to get rolling. Once in place is works great and makes tracking and filing returns in multiple states very easy. A few major concerns - 1. Pricing - They will offer a significantly discounted first year. Those discounts expire and you should expect to get hammered in the years that follow. 2. API Calls - API calls count toward usage (10 to 1), so 100 calls is 10 transactions. Sounds ok right? Wrong. Out of the box BigCommerce will hit the Avalara API up to 4 times for one transaction or user in the sales funnel - twice in the cart and twice in checkout. This means API calls rack up about 3-4x faster than you expect. This can be addressed through theme customization, but will take a developer. We blew through our planned annual usage in about 4 months before we realized how out of control the API calls were. If you have decent traffic you need to customize when calls are being made to avoid huge usage waste and cash burn.