Upcoming National Meeting Illinois State and Local Tax Update Webinar Join industry tax peers for a timely update on Illinois State and Local Taxes. This live webinar is open to industry tax professionals nationwide who have an interest in Illinois tax.
Legislative Alert ISSUE 26-40; November 12, 2026 Portland City Council to Consider Pay Ratio Surtax Increase in November; November 3 Election Results Set the Stage for Active 2027 State Tax Sessions
Cost Conscious ISSUE 26-22; October 30, 2026 Will Illinois’s Digital Advertising Tax Survive Judicial Scrutiny? Illinois's targeted advertising services tax is already facing multiple legal challenges, including claims under the Internet Tax Freedom Act, the Commerce Clause, the Due Process Clause, and the First Amendment. Based on the issues raised in the pending litigation, which challenge do you believe poses the greatest threat to the ta
COST - Council on State Taxation Amicus Briefs Microsoft Corporation v. Oregon Department of Revenue The Microsoft v. Oregon DOR case raises the issue of fair apportionment. Specifically, whether the apportionment formula must be adjusted to reflect the foreign source income that was included in the tax base.
COST - Council on State Taxation COST Studies, Articles & Reports 2026 State and Local Amnesty Programs Tracker of most state and local tax amnesty programs enacted and conducted in 2026.
COST - Council on State Taxation COST Comments & Testimony Joint Letter re. Proposed Rules Implementing the Digital Asset Tax Act On October 30, 2026, COST signed onto a joint letter with the Taxpayers’ Federation of Illinois and the Illinois Bankers Association, submitted to the Illinois Department of Revenue in response to its proposed rules implementing the Illinois Digital Asset Tax Act.
