“Consumers have continued to shift dollars into online channels, and online vendors are increasingly looking for a way to automate the collection and filing of their tax liabilities across multiple states,” Devor told VentureBeat. TaxJar’s basic offering helps companies calculate how much sales tax they need to collect at the point of sale, and it pulls reports on how much they’ve collected in sales tax from all the channels they sell through — from Amazon to Shopify to eBay. TaxJar also has an AutoFile feature that helps ecommerce businesses file sales tax returns in various states. TaxJar Basic can cost companies anywhere from a reasonable $19 per month to a hefty price of nearly $1,000 per month, depending upon how many orders they import.

https://venturebeat.com/2019/01/09/taxjar-gets-60-million-for-software-that-automates-ecommerce-sales-tax-calculations/