Guilherme Posser da Costa is recorded in Sao Tome as founding managing partner with De Juris Posser da Costa & Associados. The current firm and Sérvulo profiles identify him as founder since 1991 and document work involving foreign investment, public and commercial law, tax, and international disputes. This profile uses the published role and practice context without assigning every service of an affiliated office to the individual or promising present availability.
For comparison purposes, the verified scope is Foreign Investment, Public Law, Commercial Law, Tax Law, International Arbitration. Clients should separate legal advice from filing-agent tasks and confirm who communicates with registries, migration officials, employers, banks, or investment authorities.
Sao Tome and Principe's individual income-tax code uses presence exceeding 180 days and other connecting factors when determining tax residence, which is separate from immigration status. Before instructing Guilherme Posser da Costa, verify the current rule and filing sequence directly, because company registration, investment approval, residence, work authorization, and nationality are distinct decisions.
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