2026 World Tax Guide | Regional profile (Tax Controversy)

The Deloitte network of firms in the Americas region leverages a combination of tax and compliance knowledge to provide businesses with a cohesive perspective, enabling companies to make informed business decisions at any stage of the tax controversy cycle. In the Americas region, Deloitte’s Tax Controversy teams consist of numerous professionals in multiple locations across the network of Deloitte firms. 

The Deloitte network has professional services teams across the globe to provide services locally while coordinating engagements regionally or globally from a central location. We also draw on the capabilities and strengths of Deloitte’s other businesses—Audit & Assurance, Consulting, and Risk & Financial Advisory—to provide broad-scale, tax-aligned business insights.

Our Tax Controversy practitioners in the Americas region provide assistance spanning the various stages of federal, state, and local examinations—from dispute mitigation/planning to issue resolution and post-exam improvements. Through decades of working with clients on a broad range of tax issues, Deloitte firms in the Americas region have fine-tuned their technology, analytical procedures, and planning methodologies to offer a broad-based, scalable solution that can be tailored to the specific circumstances of each client and each tax controversy.

Innovation is a key component of Deloitte’s Tax Controversy offerings across the Americas region. Deloitte’s network of firms is investing heavily in tax technology and analytics capabilities and developing solutions to help clients mitigate the potential for, oversee, and learn from the various types of tax disputes, which, in turn, translates to creating value for our clients. Collaboration allows Deloitte’s network of firms to develop tax technology solutions that address specific and complex tax requirements in the Americas region.

The Deloitte network of firms in the Americas region can provide tax controversy services leveraging innovative software tools, including:

• Myinsght CE: Proprietary web-based tool with capabilities for overseeing examination-related data and reporting.
• Interest Analyzer: Service to verify the accuracy of complex federal and state tax agency interest calculations.
• Data Management: Assistance with integrating systems to capture, retain, process, and analyze information and respond quickly to high-volume information requests. Assistance with planning for tax data retention related to enterprise resource planning (ERP) systems implementation.

Some of our cross-border tax controversy capabilities include the following services:

• Audit readiness assessments, including:
  • Risk assessments, 
  • Documentation readiness and retention preparation, and
  • Mock audits;
• Examination representation;
• Appeals representation and dispute resolution;
• Proactive resolution services;
• Assistance with respect to transfer pricing issues; and
• Tax controversy software tools and services.

Awards

2025 International Tax Review (ITR) Americas Tax Awards:

• Regional Awards:
  • Americas Indirect Tax Firm of the Year
  • Americas Tax Advisory Firm of the Year (third consecutive year)
  • Americas Tax Compliance & Reporting Firm of the Year
  • Americas Tax Policy Firm of the Year (third consecutive year)
  • Americas Tax Technology Firm of the Year (eighth consecutive year)
  • Americas Transfer Pricing Advisory Firm of the Year (ninth consecutive year)
  • Latin America Transfer Pricing Advisory Firm of the Year (second consecutive year)
  • North America Tax Advisory Firm of the Year
  • North America Transfer Pricing Advisory Firm of the Year (fourth consecutive year)

Deloitte firms in the Americas region also won 9 jurisdictional awards —

• National Tax Firms of the Year (Tax Advisory):
  • Brazil Tax Advisory Firm of the Year
  • Peru Tax Advisory Firm of the Year

• National Transfer Pricing Firms of the Year (Transfer Pricing Advisory):
  • Brazil Transfer Pricing Advisory Firm of the Year
  • Ecuador Transfer Pricing Firm of the Year
  • Mexico Transfer Pricing Firm of the Year
  • US Transfer Pricing Firm of the Year
  • Venezuela Transfer Pricing Firm of the Year

• National Indirect Tax Firms of the Year (Indirect Tax Advisory):
  • Canada Indirect Tax Firm of the Year
  • Mexico Indirect Tax Firm of the Year

• 2026 ITR World Tax & World Transfer Pricing tier rankings:
  • World Tax: Deloitte was ranked Tier 1 in five jurisdictions in the US.
  • World Transfer Pricing: Deloitte was ranked Tier 1 in the US.

Eminent leaders

• International Tax Review World Tax guide: 69 leaders from the US were listed in the 2026 World Tax guide for their individual abilities and in-depth capabilities, experience, and specialist knowledge.

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