Our team

Susanne Rust

Susanne founded Abacus Accounting in autumn 2009 and has managed the practice since then. She has over 15 years of professional experience in tax consultancy for international transactions. She holds a degree in International Economics from the University of Maastricht and has taken various specialist university courses in Spanish employment and tax law.

Susanne has taught Masters Classes on the Spanish tax system at the University of Hamburg and has written many articles on this subject. Before founding the practice, she also worked as a consultant and as the finance director for a medium-sized company. Susanne is fluent in German, Spanish, English and Dutch.

Cristina Ruipérez

Cristina graduated in law from the University of Valladolid and then completed a Master's Degree in Legal Practice specializing in Labor Law, and a Master's Degree in Human Resources Management.

She joined our team in June 2017 to lead the payroll department, taking care of end-to-end payroll processes, social security presentations, monthly and quarterly taxes, as well as staff management in relation to contracts, clauses, severance payments and the interlocution with different official organisms.

Cristina has more than 10 years of experience in the labor field, in several labor consultancies and in payroll outsourcing departments, performing and controlling integral payroll processes and providing legal advice for Spanish companies or international companies with branches in Spain, applying her knowledge of Spanish, English and Portuguese.

Margarita Sánchez de la Rosa

Margarita holds a degree in Business Administration and Management from the University of Alcalá de Henares (Madrid). She extended her studies with an Advanced Course of the Spanish tax system by the UNED (National Distance University) and a Superior Course in Accounting Management by the CEF (Center for Financial Studies). Margarita is a member of the Economists Association of Madrid.

She joined our accounting and fiscal team at the beginning of 2019, concentrating on the preparation of accounting closures, presentation of annual accounts and corporate tax returns and taking care of all commercial inquiries.

Margarita has more than 20 years of professional experience in accounting, tax and financial management. She has worked in international companies, which are from the industrial, transport and service sectors. She is fluent in Spanish, English and German.

Sonia Martínez

Sonia joined our team in June 2016 in the Accounting Department. Her duties include accounting, creating financial statements and managing our client base. She also produces records, reports and monthly and annual tax declarations and financial statements.

She has a wide range of experience in these areas in large and medium-sized companies and has worked both nationally and internationally. She has worked in international finance departments where she was able to utilise her knowledge of Spanish, English and German. She also has experience using different ERP Systems.

Conny Espejo

Conny has been adding value to our team as office secretary since 2011. She is responsible for administration tasks, reception and dealing with correspondence. She has a wide range of experience working as a secretary and assistant in international offices. She is the point of contact with our clients for the collection and dispatch of documents, meeting requests and queries concerning our accounting services

She also carries out administrative tasks for our clients, such as accountability, sending documents and handling post. Conny is a native German speaker and has excellent knowledge of Spanish and English.