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ITR World Tax

The definitive guide to the world's leading tax firms

ITR World Tax is the trusted authority on the global tax and transfer pricing markets, recognising the firms and professionals delivering the highest standards of technical expertise and client service. Our research provides an independent assessment of who is shaping tax advisory and representative work across jurisdictions and disciplines worldwide.

Through an extensive research programme that incorporates firm submissions, client feedback, peer review and market intelligence, we identify the firms and individuals leading the profession. The result is a comprehensive resource that helps organisations make informed decisions when selecting tax advisers and allows firms to showcase their expertise on a global stage.

Rankings Analysis

Grant Thornton Advisors’ latest acquisition has produced the fifth-largest US advisory firm by revenue, but there’s still a clear gulf between it and the big four
Historical World Tax data suggests the ‘largest law firm merger in history’ may not pose a serious threat to the world's leading tax practices
Awards
ITR invites tax firms, in-house teams, and tax professionals to make submissions for the 2027 World Tax rankings and the 2026 ITR Tax Awards globally

Awards

Awards
ITR is delighted to reveal all the shortlisted nominees for the 2026 Europe Tax Awards
Awards
View the official winners of the 2025 Social Impact EMEA Awards
Awards
Submit your nominations to this year's WIBL EMEA Awards by 16 February 2026

World Tax Rankings 2026: Deloitte and DLA Piper are top of the world

ITR concludes its analysis of World Tax’s rankings for 2026 by highlighting the firms that stood out most on a global scale

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