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 26-23; November 13, 2026 Help Shape COST's Upcoming Unclaimed Property Webinar – Unclaimed property compliance continues to present significant challenges for multistate businesses as states expand enforcement efforts, refine audit practices, and update reporting requirements. From audit defense and estimation methodologies to voluntary disclosure agreements and transaction due diligence, tax and compliance professionals
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.
