This report is the result of business practices conducted in the COLOMBIAN ASSOCIATION OF MIPYMES (ACOLMIPYME), through SOLUCIONES F & A company, as tax inspection assistant, with the general objective of carrying out book-keeping procedures for 2019. The company ACOLMIPYME is dedicated to support and promote the growth of small and medium-scale companies, where SOLUCIONES F & A is part of the same trade, to make revisions, accounting and financial support, which is in charge of tax inspection in CLINISUMINISTROS SAS company, since it fulfilled the requirements to be implemented. The work was done following the previous agreements at F & A SOLUTIONS office and in the costumers’ office, fulfilling the established functions as auditor assistant. The practice was done from February 18 to May 11, 2019, following the established working shift through 350 hours. Such work, achieved the requirements for the development of professional practice. The activities carried out during the assistantship favored the development of the stated objectives for tax inspection assistant required by ACOLMIPYME company, as a way to learn the professional work of an accountant upon graduation.