The powerhouse team at McConnell Valdés LLC remains a marker leader, bringing strength to advising domestic corporates, household-name financial institutions (such as UBS) and global brands (including Google, Amazon, Coca-Cola, Shell and Hewlett Packard) on a wide range of tax matters. With an active client portfolio spanning sectors ranging from tech, pharmaceuticals and retail to beverages, telecoms, manufacturing and energy, the practice’s comprehensive offering covers tax incentives and exemptions, tax aspects of M&A and deal structuring, consumption tax, tax litigation and advice for non-profit organisations on the structuring and establishing of operations in Puerto Rico. The team is co-led by tax practice chair Isis Carballo-Irigoyen, who brings expertise to start-up operations, reorganisations, acquisitions, financings and competent authority proceedings before the Puerto Rico Department of Treasury and the Internal Revenue Service, and vice-chair Yamary González-Berríos, a specialist in corporate and partnership tax. Other key figures include Rubén Muñiz-Bonilla, who represents clients in tax controversy and litigation matters, including tax audits and examinations, administrative appeals and court proceedings, and Lillian Toro-Mojica, who advises on employee benefits, income tax, property taxes and municipal licence tax.

The market-leading team at O'Neill & Borges advises insurers, government agencies and multinational corporates across sectors ranging from financial services, consumer products, healthcare and manufacturing to real estate, tech, energy, telecoms and hospitality, on the full range of tax matters. The practice’s comprehensive service covers the tax aspects of M&A, the determination of tax-efficient structures, administrative procedures, tax incentives, transactional work related to bond issuances and financing transactions, tax registrations and compliance, pension and employee benefits, and tax litigation challenging tax impositions by the Puerto Rico Secretary of the Treasury, the Municipal Revenue Collection Centre and various municipalities. Amaya Iraolagoitia and Rosa González-Lugo are key contacts.

The tax practice group at Pietrantoni Méndez & Alvarez LLP provides the full range of taxation services, advising local and stateside entities, corporations, financial institutions and government entities on sales, Puerto Rico and US federal income taxation, municipal taxation and tax credits. Dianette Rivera-Meléndez and Edgar Ríos-Méndez are key contacts.

DLA Piper Puerto Rico draws on the experience of its team to advise insurers, domestic financial institutions and multinational corporates (including Citibank, Southwest Airlines and Air Canada) on a diverse spectrum of matters, including complex, cross-border transactions, tax planning and structuring, transfer pricing, tax audits and appeals, and tax litigation. The firm’s robust client portfolio spans sectors ranging from aviation, financial services and energy to beverages, tech and education. The practice is headed by Manuel López-Zambrana, an expert in tax controversies who assists clients with complex US federal and Puerto Rican income tax matters, and with the obtainment of Puerto Rican tax incentives for manufacturing and IP licensing activities. Other key figures include of counsel Edwin Figueroa Alvarez, who brings strength to advising start-ups and businesses on the tax aspects of local market entry, and associate Pablo Gil Díaz. Of counsel Bibiana Cruz joined the firm from Holland & Knight LLP in Miami in January 2025.