This post originally appeared on McDermott’s Inside SALT blog, which is dedicated to in-depth coverage of issues surrounding state and local tax.

In June 2018, just before the US Supreme Court ruling in Wayfair, Illinois enacted an economic nexus standard modeled after South Dakota’s law (see our prior coverage). The new Illinois standard takes effect on October 1, 2018. On September 11, the Illinois Department of Revenue (Department) issued an emergency rule (Regulation 150.803), together with other guidance found on its website, intended to assist remote retailers with compliance with the new law. (more…)