# São Paulo electronic service invoice system updates > Live situation record from CLSTR: https://clstr.news/situations/so-paulo-electronic-service-invoice-system-updates > Updated: 2026-10-02T20:00:01.000Z. Sources: 10. Developments: 2. The São Paulo Municipal Finance Secretariat has implemented technical updates to the electronic service invoice (NFS-e) issuance system. Effective October 1, 2026, these changes aim to improve data integrity and ensure stricter compliance with municipal tax regulations. Key updates include new mandatory validations for tax classification, the Brazilian Nomenclature of Services (NBS), and specific rules regarding the IBS and CBS. The ‘Total Invoice Value’ field must now represent the entirety of financial inflows from service provision, including reimbursements for third-party expenses. To deduct these values from the calculation base, they must be reported through referenced documents. The system will automatically populate the ‘Total Received Value’ (VTR) field based on the total invoice information. Service providers and accounting departments are required to update their management systems (ERPs) to prevent communication failures with the municipal server and avoid document rejections. ## Timeline ### 2026-10-02: São Paulo updates electronic service invoice (NFS-e) system São Paulo has updated its electronic service invoice (NFS-e) system with new mandatory validations for tax compliance, impacting how total values and tax deductions are reported. 2 sources. https://clstr.news/cluster/so-paulo-updates-electronic-service-invoice-nfs-e-system ### 2026-09-29: Saae/Sorocaba to implement new invoice layout in October Saae/Sorocaba is updating its water and sewage invoice layout in October to comply with Brazil's Tax Reform, introducing clearer information and digital access via QR Code without changing consumption costs. 8 sources. https://clstr.news/cluster/saaesorocaba-to-implement-new-invoice-layout-in-october --- Cite as: São Paulo electronic service invoice system updates. CLSTR, https://clstr.news/situations/so-paulo-electronic-service-invoice-system-updates