McDermott Will & Schulte, a global law firm

Catherine (Cate) A. Battin is the head of McDermott Will & Schulte’s State & Local Tax Practice Group and has practiced at the firm for more than 20 years.

Cate represents clients in all aspects of state and local tax matters, including controversies at the audit, administrative, and judicial levels across several jurisdictions. She advises on national state tax strategies involving a broad range of issues, such as income tax apportionment, sourcing, nexus, transfer pricing, combination and sales tax characterization of products and services, and other local excise tax issues. She has a particular focus on state and local tax controversies and has litigated cases throughout the United States, successfully arguing cases before state appellate and supreme courts.

Cate regularly speaks on state and local tax issues and has presented before organizations such as the Tax Executives Institute, the Council on State Taxation, the Taxpayers’ Federation of Illinois, and The Chicago Tax Club.

Prior to joining McDermott, Cate worked at a major international accounting and consulting firm, where she focused exclusively on state and local taxes.

Mary Kay McCalla Martire focuses her practice on a wide variety state and local tax issues. She advises clients on matters related to sales tax, with an emphasis on the sale of digital products. In addition, she advises business clients on income tax apportionment and remote employee withholding obligations. Mary Kay counsels individual clients on residency and income sourcing questions, and frequently advises captives and their insureds on direct procurement tax issues. She also has experience with state and local utility and telecommunications tax matters.

Mary Kay has an extensive litigation background in state and federal court, as well as administrative tribunals. She has particular experience in the defense of qui tam (whistleblower) claims filed in the state tax arena and has won the dismissal of many Illinois False Claims Act cases. Mary Kay played a key role in many of the reported decisions issued by the Illinois appellate court in this area. She also has experience defending clients against class action and consumer fraud claims.

Mary Kay also has represented clients in a number of state insurance tax litigation matters, including serving as the principal trial attorney for a group of insurance companies that successfully challenged the constitutionality of the Illinois Privilege Tax (Milwaukee Safeguard Ins. Co. v. Selky, 179 Ill.2d 94 (1997)).

Mary Kay serves as Co-Chair of the Chicago Office Pro Bono Committee. She is actively engaged in a number of pro bono matters, including the representation of not for profits seeking sales and property tax exemptions, and serving as a guardian ad litem in child custody disputes. In 2014, Mary Kay was awarded one of McDermott’s Chicago Office pro bono service awards. In addition, she is an editor of the Firm’s State Tax Blog, InsideSALT.com.