Gabriela Miziara Jajah - SiqueiraCastro
Gabriela Miziara Jajah
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30 Oct Gabriela Miziara Jajah

Posted at 12:08h in Partners by

Gabriela Miziara Jajah

Partner

Rua Tabapuã, 81 – 4th Floor
04533-010 São Paulo – SP

Phone:
+55 11 3704-9840
+55 11 3594-0900

E-mail:
gjajah@siqueiracastro.com.br

  • Tax
  • Tax Planning

 

• Law Degree from Catholic University of São Paulo (PUC-SP) Law School, 2009
• Specialization in Tax Law from the Institute for Teaching and Research (Insper), 2014
• Languages: Portuguese, English and Spanish
• Member of the Brazilian Bar Association

 

Professional with over 15 years of experience in tax consulting and tax litigation, both administrative and judicial, with a strong track record in the strategic management of tax litigation portfolios.

Gabriela provides tax advisory services to domestic and international clients across a wide range of industries, including the financial, industrial, and services sectors.

She holds a Master of Laws (LL.M.) in Tax Law from the Instituto de Ensino e Pesquisa (Insper) and a Law degree from the Pontifical Catholic University of São Paulo (PUC-SP).

Over the years, Gabriela has been recognized for her excellence in the tax field by leading national and international legal directories and rankings, including The Legal 500, Leaders League, Chambers, ITR World Tax, and Análise Advocacia Mulher.

  • Recognized by The Legal 500 2025 – Tax Advisory
  • Recognized by Latin Lawyer 250 2025 – Tax
  • Recognized by Chambers Brazil 2025 – Tax Non Contentious
  • Elected as one of the most admired professionals in Tax Law Practice by Análise Advocacia Mulher (2022)
  • Elected as one of the most admired professionals in the Banking sector by Análise Advocacia Mulher (2022)
  • Recognized among the top tax lawyers by The Legal 500 Latin America
  • JAJAH, Gabriela Miziara. The Liability of Third Parties in Tax Enforcement Proceedings and the IDPJ. Jota, São Paulo, March 21, 2023.
  • JAJAH, Gabriela Miziara. The Necessary and Ongoing Relief of Payroll Tax Burden. Âmbito Jurídico, São Paulo, September 6, 2022.
  • JAJAH, Gabriela Miziara. The Federal Revenue’s Use of Asset and Rights Listings and the Violation of Efficiency and Reasonableness Principles. Estadão, São Paulo, April 11, 2022. Blog do Fausto.
  • JAJAH, Gabriela Miziara. Will the Tax War Really End? Valor Econômico, São Paulo, November 18, 2019.
  • JAJAH, Gabriela Miziara; CLARKE, Daniel Franco. While the Tax Reform Does Not Come. Jota, São Paulo, January 14, 2019.
  • JAJAH, Gabriela Miziara. Asset Confusion in Tax Matters. Valor Econômico, São Paulo, May 5, 2017.
  • JAJAH, Gabriela Miziara. Who Benefits from the Demonization of Refis? Estadão, São Paulo, April 19, 2017.
  • JAJAH, Gabriela Miziara; CLARKE, Daniel Franco. Risks of Merging the PIS and Cofins Tax Regimes. Valor Econômico, São Paulo, March 27, 2017.
  • ROSA, Arthur; OLIVON, Beatriz. Government Reduces Social Contribution Credits. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, January 17, 2023.
  • AGUIAR, Adriana. São Paulo City Approves Taxpayer Code. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, January 20, 2020.
  • AGUIAR, Adriana. São Paulo City Approves Taxpayer Code. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, January 19, 2020.
  • IGNÁCIO, Laura. Confaz Publishes Rule on Undue Tax Benefits. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, March 16, 2018.
  • FRIAS, Maria Cristina. Change in Tax Authority Approach Increased Assessments, Say Lawyers. Comments: Gabriela Miziara Jajah. Folha de São Paulo, São Paulo, February 22, 2018.
  • IGNÁCIO, Laura. Federal Revenue Regulates Debt Consolidation in PRT. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, December 13, 2017.
  • IGNÁCIO, Laura. Tax Authorities Require Registration of Payments for Software Licensing. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, October 18, 2017.
  • IGNÁCIO, Laura. Federal Revenue Ignores STJ Ruling and Continues to Tax One-Third Vacation Bonus. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, August 23, 2017.
  • IGNÁCIO, Laura. São Paulo City Hall Opens Tax Debt Installment Program. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, July 6, 2017.
  • IGNÁCIO, Laura. Tax Authorities Deny PIS and Cofins Credits on International Freight. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, January 25, 2017.
  • IGNÁCIO, Laura. São Paulo Tax Authority Begins Electronic Notifications to Companies. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, August 23, 2016.
  • AGUIAR, Adriana. Federal Revenue Changes Interpretation on PIS and Cofins Credits. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, June 10, 2016.
  • OLIVON, Beatriz. Companies Cannot Deduct Aneel Fines from IR and CSLL. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, April 19, 2016.
  • OLIVON, Beatriz. STJ Prohibits Use of Interest on Equity to Pay Cofins. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, April 13, 2016.
  • BACELO, Joice. Rio Conditions ICMS Amendments on Tax Authority’s Approval. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, January 22, 2016.
  • BACELO, Joice. State of Rio Creates New Tax and Changes ITCMD Rates. Comments: Gabriela Miziara Jajah. Valor Econômico, São Paulo, January 5, 2016.