Grant McCarthy Group
GMG focuses on helping clients with all business tax practices procedures, compliance, and multi-jurisdictional tax complexities. We assess situations to help our clients reduce their tax burdens and maximize their cash flow.

Providing technology enabled services to simplify tax complications and provide financial benefits.
GMG is committed to ensuring our clients only pay their fair share of tax. We leverage Vertex to deliver real time savings to clients and reduce the need for audits to determine areas of exposure or overpayment. Our services deliver quantifiable financial value.
Benefits of Our Partnership
Machine learning under the direction of experienced tax professionals.
Correction of ERP and tax determination engine rules reduces overpayments and underpayments.
Maintained by tax professionals utilizing technology to deliver streamlined results.
Resources for You
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Data SheetLearn about end-to-end tax solutions to manage sales, use, and value added tax in SAP ECC.
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Blog Post
Texas’ New State of Mind on the Taxability of Data Processing Services
George Salis unpacks Texas’s new rule expanding sales tax on data processing and its impact on e-commerce. -
Blog Post
Brazil’s E-Invoice Testing Begins
Ana Maciel explains how Brazil’s new e-invoice testing phase sets the stage for 2026 tax reform compliance.