Assegaf Hamzah & Partners' tax and customs practice handles the full spectrum of contentious and non-contentious matters for both Indonesian and international clients. The team advises on international tax, investment structuring, and the tax implications of M&A transactions. On the contentious side, the practice handles audits, objections against assessments, and appeals to the Tax Court and Supreme Court. The practice is led by Nazly Parlindungan Siregar, whose expertise is in international tax advisory matters, covering cross-border M&A and global business model optimisation for both inbound and outbound transactions.

HHP Law Firm's tax and customs practice provides a full-spectrum offering, covering both advisory and contentious matters. The team advises domestic and international clients on transfer pricing issues as well as on the structuring of tax-efficient arrangements for cross-border transactions. The practice is also active in handling sophisticated tax litigation. The group is led by Ponti Partogi, whose broad practice includes advising on tax credits, double tax treaties, and withholding tax. Other key figures include Daru Hananto and Niken Kristalia, who both focus on tax disputes, and Iman Hindrajanto, whose work covers regulatory and compliance issues, with a focus on the energy sector.

Anagata Law Firm's tax, customs, and international trade practice advises a strong roster of multinational technology and manufacturing clients on a range of complex cross-border issues. The team has notable experience advising major cloud service providers on import regulations and HS code classification, handling anti-dumping investigations for manufacturers, and structuring tax-efficient acquisitions in the fintech sector. The practice is led by Riza Buditomo, an experienced tax court litigator who focuses on customs and trade disputes. He is supported by Muhammad Ramzi, who advises on supply chain management and export/import regulations, and Marvin Octavdio, who specialises in cross-border tax structuring and audit defence.