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William O. Grimsinger has extensive experience counseling individuals and businesses of all sizes with regard to tax and business problems.

He represents clients in federal and state tax controversies, both civil and criminal. He has handled and managed IRS and state civil audits and IRS criminal investigations. Mr. Grimsinger has represented clients in IRS and state administrative protests and appeals, and has prosecuted civil tax cases, defended criminal tax cases, and filed and litigated claims for refunds as well as represented clients in civil litigation related to tax matters.

Mr. Grimsinger’s practice includes federal and state business tax issues for private and public companies; payroll and employment tax matters for private and public companies; voluntary disclosures for businesses and individuals; and tax matters for individuals, including tax shelters, income tax, employment tax, and individual and transferee tax liability. He has successfully resolved matters including business income and deductions; white collar crime investigations; heavy truck and fuel excise tax matters; employment tax liabilities; assessed and asserted penalties; individual liability of business and individual tax assessments; worker classification disputes; and tax collections. 

Seminars & Presentations

• Annual Seminar, Chamberlain, Hrdlicka, White Williams & Martin, November 2007
• “Marginal Progress: Legislation and Regulations Rough Out the Margin Tax,” presentation to the Beaumont Chapter of the Texas Society of CPAs, October 2007
• “ Texas Two Step: Franchise and Property Tax Reform,” Various presentations, 2006 and 2007
• “Just when you thought things couldn’t get any better – The final regulations under Circular 230,” June 2005
• “A Fine Mess: Texas Taxes after the West Orange Cove Decision,” June 2005
• “Taxation of Religious Organizations,” May 2005
• “Tax Shelter Litigation Update,” November 2004
• “Salt Mining: A Look at State and Local Tax Issues,” May 2004
• “Exacto Springs Eternal: Planning for IRS Attacks on Reasonable Compensation,” March 2004
• “Let Mikey Try It: Using New Programs in Dealing with the IRS,” November 2003
• “The Future of State and Local Taxation,” November 2002
• “2001: A Tax Odyssey,” November 2001

Media Mentions

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Professional Affiliations

• Past Chair, Houston Bar Association, Section of Tax
• Member, Texas State Bar, Tax Section
• Member, American Bar Association, Section of Tax