Org for your e-commerce business covers everything you need to know. On January 1, 2021, Illinois changed their sales tax filing requirements for remote sellers.We'll show you how to work with the changes. This guide will inform you of various legal requirements and direct you to additional resources. Starting a business in Illinois means creating a business plan, choosing a business structure, and filing paperwork to incorporate. The state of Illinois requires marketplaces to collect sales tax on behalf of sellers on online marketplaces like Amazon and Walmart. In the case of Illinois, which is an origin-based state for sales tax, the key factor is the location of your business, not the customer's shipping address. New Federal Reporting Requirement For Many Small And Mid-Sized Businesses. In 2021 , Congress enacted the Corporate Transparency Act. You need the following things to commence an e-commerce business in Illinois: 1.