Job Summary: Assist the Tax Analyst/Tax Supervisor in issuing invoices, performing fiscal calculations, and preparing tax returns, while maintaining a positive work environment and departmental organization. Key Responsibilities: 1. Fiscal support to analysts and supervisors 2. Issuance and verification of invoices 3. Fiscal calculation and preparation of tax returns Assist the Tax Analyst/Tax Supervisor in issuing invoices and performing fiscal calculations for companies. Maintain a positive work environment, departmental organization, equipment organization, and organization of shared common areas. * Issuance and verification of Input, Output, and Service Invoices. * Importation of Input, Output, and Service Invoices via XML, Web Service, and SIEG. * Monitoring of legislation. * Fiscal calculation for companies under Simples Nacional and Presumed Profit regimes (Commerce and Services). * Preparation, verification, and submission of monthly municipal, state, and federal tax returns. * Preparation and submission of annual tax returns (DESUP SP, DIRF, DIMOB, DMED, DECLAN, DEFIS). * CND control. * Recalculation of unpaid payment slips for clients. * Sending payment slips to clients. * Task management via the GESTTA system. * Respond to email requests within 24 hours. * Provide telephone support to clients.