The Serbian customs authorities will launch NCTS 6 on 28 May 2026 at 21:00, with the system unavailable for 5–6 hours. Activation of Phase 6 occurs on 29 May 2026 during the morning. TransitNet will enable a “Wait” scenario that allows transit declarations to be submitted with security codes 0 or 2, and will automatically attach the IC2 MRN when the IC2 service is selected. Clients are advised to include the IC2 MRN in transit declarations for shipments routed through Croatia or Bulgaria.

Serbia has introduced significant amendments to its VAT Rulebook, effective from the April 2026 VAT period. Key changes include mandatory SEF self‑invoicing using the “Individual VAT Record – Internal account” document type, new rules for VAT base estimation, adjustments, discounts, and goods returns, and simplified timing and consolidation of adjustment documents. These reforms tighten compliance and digital reporting requirements across the country.

Serbia’s new e‑invoicing law, adopted in Official Gazette No. 109/2025, introduces mandatory e‑invoicing for retail sales to corporate cardholders and public sector entities, postpones pre‑filled VAT returns to 2027, and requires internal invoices to be generated in the SEF system. The Ministry of Finance also released SEF version 3.14.0 with new validation and reporting features.

Serbia’s 2026 VAT amendments overhaul reporting, invoicing and timing rules, with most provisions taking effect on 1 April 2026. The changes tighten internal invoicing requirements, postpone the pre‑filled VAT return model to 2027, and expand the scope of electronic invoicing (SEF) for internal invoices. Businesses must adjust ERP systems and compliance workflows to meet the new deadlines and documentation mandates.