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Miami, FL Accounting Firm

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About Guillen Serrano & Associates

At Guillen Serrano & Associates, listening is the foundation of our business. We take the time to get to know our clients so we can find practical ways to meet their accounting and tax needs, understand their struggles, and help them achieve their financial goals. From startups and entrepreneurs to established enterprises, we provide quality accounting services and strategic tax planning to all types of businesses. We also offer prompt and accurate income tax preparation for business owners and individuals.

Our exceptional reputation in the community reflects our high standards, commitment to lowering taxes, and unparalleled customer support. Call us at 305-831-4093 now and request a free consultation to learn more about what our Miami, FL Accounting Firm can do for you and your business.


Nestor Guillen

Nestor L. Guillén, Founder & Partner

Mr. Guillén is a recognized financial expert having spent the last 30 years in accounting advisory, tax planning, tax consulting, mergers and acquisitions, tax and financial due diligence, and cross border transactions for individuals and corporations in USA, Latin America and the Caribbean. Mr. Guillén is a founder partner of Globalbiz Tax & Business Consulting, and Guillen Serrano & Associates in Miami, besides being Founder and Managing Partner of Grant Thornton in Venezuela, was the Executive Director of Grant Thornton LLP’s Latin America Tax Gateway, based in Miami, and served on the Latin American Executive Committee of Grant Thornton International.

Additionally, Mr. Guillen served on numerous Boards including the British American Chamber of Commerce of Florida, the International Committee of the Greater Miami Chamber of Commerce and several bi-national Chambers of Commerce in South Florida. Mr. Guillen is licensed as a CPA in the states of Florida and Georgia, USA and in Venezuela; he is a graduate accountant from the Universidad del Zulia, Venezuela, He has a specialized degree in International Businesses from the Universidad Metropolitana, Caracas, Venezuela, and a MBA graduate with Distinction from Keller Graduate School of Business at Devry University in USA.


Gustavo Serrano

Gustavo Serrano, Founder & Partner

Gustavo Serrano has a wide career with over 25 years experience, since the beginning has worked as a tax advisor in different Legal Firms recognized even as Executive Vice President of Tax Affairs at Private and Commercial banks. He is a Partner Guillen, Serrano & Associates and manages as well the operation in Venezuela of the affilaited firm Serrano Cid & Asesores. Mr. Serrano has authored / co-authored several books regarding tax matters. He has been a Professor of Tax Law at the Universidad Católica Andrés Bello, and at the "Institute for Professional Development for the Association of CPAs of the Federal District and Miranda State in Venezuela. (IDEPROCOP)". He has also been a member of the "Tax Standards Committee for the “Federación de Colegios de Contadores Públicos de Venezuela", the "Asociación Venezolana de Derecho Financiero (ASOVEDEFI)", the "Colegio de Contadores Públicos del Distrito Capital", the "IFA (International Fiscal Association)" and the "Instituto Colombiano de Derecho Tributario (ICDT)".

Prior to founding in 2003 his own Tax and Business Consulting firm, Mr. Serrano was a Tax Consultancy Partner at the law firm Torres Plaz & Araujo, and an Executive Vice-President for Tax Affairs at Interbank C.A., Banco Universal. He has received several awards including Order of the Public Accountant from the “Colegio de Contadores Públicos del Estado Miranda”, the Order of Merit from the “Colegio de Contadores Públicos del Distrito Capital”, and the Order of Public Accountant from the “Federación de Colegios de Contadores Públicos de Venezuela”. Serrano has achieved honorable mentions in his degrees, among which are; a Degree in Accounting, Andres Bello Catholic University in Venezuela 1996, Bachelor of Science Degree in Business Administration, Atlantis University, EEUU 2012. Diploma in International Contracts and Litigation, Arbitration and American Law, Florida International University, USA 2014. Also He has a specialized degree in Tax Laws, Andres Bello Catholic University, Summa Cumlaude, 2002. A degree in International Taxation, Santiago de Compostela University, Spain 2009, and a Master of Business Administration, Atlantis University, USA 2014.