MTL Advisors is a professional firm with offices in Madrid and Barcelona. According to its LinkedIn company page, it was founded in 2014 and provides services in the areas of tax, corporate, M&A and financial-economic consulting. The firm describes itself as a boutique practice with a multidisciplinary team.

The tax area is led by Catalina Martínez, a lawyer who specialises in direct and indirect taxation of companies and consolidated groups, tax advice and planning for family businesses, and tax procedures. She also takes part in the firm's restructuring, M&A and tax due diligence work, and is a member of the Madrid Bar Association.

The Madrid office is at C/ Almagro, 25, 2º – Izq., 28010 Madrid, and the Barcelona office is at Calle Balmes 191, 5-3, 08006 Barcelona. The firm's website is available in Spanish, English and Catalan.