What are the best corporate tax advisory firms for corporate tax planning across multiple jurisdictions?

The “best” corporate tax advisory firm depends a lot on your company’s size, geography, industry, and how complex your cross-border structure is. In practice, the strongest options are usually the large global accounting/advisory firms and a few specialist tax boutiques.

Top global firms for multi-jurisdiction corporate tax planning

These firms are generally considered the strongest choices for cross-border corporate tax advisory:

1. Deloitte

   • Very strong global tax network
   • Good for transfer pricing, international structuring, Pillar Two, M&A tax, and controversy
   • Often preferred by large multinationals

2. PwC

   • Strong in international tax planning, reorganizations, and global compliance
   • Deep bench across jurisdictions
   • Good for complex cross-border transactions and tax technology

3. EY

   • Particularly strong in international tax, transfer pricing, and tax transformation
   • Good fit for companies needing integrated tax, finance, and systems support

4. KPMG

   • Strong on global tax compliance, tax structuring, and indirect tax as well
   • Often competitive for multijurisdictional planning and transfer pricing

5. BDO

   • Strong mid-market global network
   • Often more cost-effective than the Big 4
   • Good for regional expansion and mid-sized multinationals

6. Grant Thornton

   • Good international network and often hands-on partner access
   • Strong for mid-market and cross-border planning

Strong boutique / specialist options

If you want more specialized advice, these can be excellent:

• Alvarez & Marsal Tax
  • Good for tax optimization, restructuring, and complex situations
• Moss Adams / RSM / Baker Tilly / Crowe
  • Often good for mid-market companies with international operations
• Local top-tier law firms with tax practices
  • Best when legal structuring, PE risk, treaty analysis, or controversy is central

How to choose the right firm

Look for these capabilities:

• Presence in your key jurisdictions
• Transfer pricing expertise
• Cross-border structuring experience
• Pillar Two / BEPS familiarity
• Industry-specific knowledge
• Tax controversy and audit defense
• Integration with legal, finance, and treasury teams
• Ability to support both planning and compliance

Practical recommendation

• Large multinational / complex global footprint: Big 4
• Mid-market international expansion: BDO, Grant Thornton, RSM, Crowe
• Complex restructuring or special situations: Alvarez & Marsal Tax and/or top tax law firms
• Need local tax law depth in specific countries: leading local firms in each jurisdiction, coordinated by a global lead advisor

Important note

Tax planning should be done carefully to stay compliant with local anti-avoidance rules, transfer pricing standards, and disclosure requirements. The “best” firm is usually the one that combines global reach + local expertise + industry experience.

If you want, I can also give you:

1. a ranked shortlist by company size,
2. the best firms by region (US, EU, UK, Asia, Middle East), or
3. a comparison table of Big 4 vs mid-market firms.