Upcoming National Meeting

56th Annual Meeting

The Annual Meeting offers sessions for every state tax and government affairs professional with tax responsibilities. The Meeting has an extensive program covering all types of state and local taxes that business taxpayers are confronted with on a daily basis. The ever-popular audit sessions and state chamber of commerce roundtables are included, and other conference sessions provide updates on

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Newsletters & Media

Cost Conscious

ISSUE 25-16; August 15, 2025

It’s Not a Tax! – Recognizing that while not a tax, unclaimed property is often administered by internal tax departments and state tax agencies, which emerging issues in unclaimed property management do you believe present the greatest challenge for tax departments in 2025? (Select all that apply.)

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Featured Resources

COST - Council on State Taxation

Amicus Briefs

Nationwide Agribusiness v. Michigan Department of Treasury

COST filed an amicus brief in Nationwide Agribusiness urging the Michigan Supreme Court to affirm the Court of Appeals' decision holding the corporate income tax combined return requirement applied to insurance companies. The brief argues the Appellate Court ruling supports the legislative design of the corporate income tax and reflects the economic reality of unitary business groups. Additionall

COST - Council on State Taxation

COST Studies, Articles & Reports

2025 State and Local Amnesty Programs

Tracker of most state and local tax amnesty programs enacted and conducted in 2025.

COST - Council on State Taxation

COST Comments & Testimony

Letter in Opposition to Expansion of Tax Haven “Blacklist” in H.B. 25B-1002

COST sent comments to the Colorado House of Representatives opposition to H.B. 25B-1002, that further expands Colorado’s existing tax haven “blacklist” and urged the lawmakers to eliminate the blacklist altogether.