Collaborating in the accounting department carrying out in the management of 3 companies and then with her they are approximately the management of 78 people.•Management of COI, an accounting software where the policies are captured and in turn you also have your catalog of accounts, this in order to keep the client up to date and reduce their taxes by 10% and thus satisfy the client.•Management of the SAT page to register, as well as taking the faithful and certain procedures from the SAT platform, to update the client and have a return return of 15%.• I identified points for improvement in the financial statements to advise the client, reducing taxes by 10% and improving performance by 10%.