Registered office: 
Plaza Garellano 17, local d
48013, Bilbao
Development center: 
C/Modesto Lafuente 46,
28003, Madrid


Servicios Informáticos de Auditoría Fiscal (SIDAF S.L.U.) is an IT engineering and consultancy company with a vocation to develop and implement specialized technologies in the fight against the underground economy, particularly tax fraud.

Our software SENDAUDIT © is a pioneering productivity tool in this field. Since 2007, its precursor application SENDA© has been successfully implemented in several tax administrations.

We provide high added value solutions thanks to a product + service philosophy that allows our clients to make the most of all the software’s potential.

We base our business model on three key pillars:

  • High knowledge of the needs and technological solutions applicable to the improvement of fiscal control, accounting auditing and the fight against economic fraud, within the framework of the new trends in electronic administration.
  • Continuous effort in R&D&I oriented towards the design of new analysis techniques and software programming for the processing and massive exploitation of data of different origin and nature, as well as the development of models based on data science.
  • The trust of our corporate clients, who have valued for more than a decade a quality service provided with high standards of confidentiality and quality.

We have a multidisciplinary team made up of professionals from the public and private sectors, with extensive experience in the world of taxation, auditing, data science and IT as well as telecommunications engineering.

Our goal is to promote cultural change in the use of new technologies in the fight against tax fraud, helping our corporate clients to improve the allocation of resources, rationalize selection and verification procedures, supporting decision-making and increasing the effectiveness of control actions.

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