Serbia — SEF Admin Module Version 2.1.0 Reaches Production and Synchronizes User Access Rights with the E-Invoicing System

KGT Country Update | Serbia — E-Invoicing (SEF) | 30 September 2026

On 28 September 2026, Serbia's Sistem elektronskih faktura ("SEF") — the mandatory e-invoicing platform operated under the Law on Electronic Invoicing — put version 2.1.0 of the SEF Admin Module into its production environment, five days after the same build first appeared on the DEMO environment on 23 September 2026. Both dates and the change description below are confirmed directly from the two dated announcements and the accompanying technical note published on efaktura.gov.rs, the site operated by Serbia's Ministry of Finance for the e-invoicing system.

The update synchronizes user access-rights status between the centralized SEF Admin module and the core SEF invoicing environment whenever a company's legal representative logs into SEF Admin, together with an unspecified system-performance optimization.

Background

SEF Admin is the centralized administration module of Serbia's e-invoicing system. It is the channel through which a taxpayer's legal representative manages which authorized users — employees, external bookkeepers, or information intermediaries acting on the company's behalf — may access and act within SEF itself, separately from the invoice-exchange environment that has been the subject of KGT's prior Serbia updates on SEF versions 4.0.0 (5 August 2026), 4.1.0 and 4.1.1 (August 2026).

Because SEF Admin controls who may issue, receive, or manage electronic invoices and related records on a company's behalf, any gap between the access rights recorded in SEF Admin and the access actually enforced in the SEF invoicing environment has direct compliance and operational consequences, independent of any change to the underlying law.

The Legislative Change

This is a technical and operational release, not a change to the Law on Electronic Invoicing (Zakon o elektronskom fakturisanju) or its implementing Pravilnik o elektronskom fakturisanju ("PEF"). It operates entirely within the existing legal framework.

It is nonetheless binding in practice: SEF Admin is the only administrative route by which a company controls delegated access to a system that Serbian law requires it to use for B2B, B2G, and G2B invoicing, so a synchronization gap between an authorization granted or revoked in SEF Admin and the access actually enforced in SEF carries the same practical compliance exposure as a legal one — a revoked user retaining access, or a newly authorized user being unable to process invoices, until the systems reconcile.

According to the technical note published with the release ("SEF Admin modul — detalji nove verzije 2.1.0"), the update introduces functionality to "synchronize the status of all users who have access rights, in accordance with the authorizations granted," triggered when a legal representative logs into SEF Admin, and separately records that "the application was optimized to improve system performance." No other functional changes are listed in the note.

Scope

The release applies to every SEF Admin instance and, therefore, to every VAT-registered taxpayer and public-sector entity subject to the Law on Electronic Invoicing, together with the information intermediaries that act on their behalf. It does not change who is subject to Serbia's e-invoicing mandate; it changes how access to the system administering that mandate is kept in sync.

Timeline

• 23 September 2026 — SEF Admin module 2.1.0 published to the DEMO environment.
• 28 September 2026 — SEF Admin module 2.1.0 reaches the production environment.

No further phased rollout or subsequent version was announced on efaktura.gov.rs as of 30 September 2026.

Businesses Affected

Any entity that uses SEF Admin to grant, modify, or revoke user authorizations — including authorizations held by internal staff, external accountants, or information intermediaries acting under a service agreement — is affected. This includes multinational subsidiaries in Serbia that delegate day-to-day e-invoicing tasks to shared-service centers, local finance teams, or third-party providers, since it is precisely that delegated-access model the synchronization fix targets.

Required Actions

• Legal representatives should log into SEF Admin on the production environment and confirm that the current user list and each user's authorization status correctly match what is enforced in the core SEF invoicing environment.
• Where a user's access was granted or revoked in the days immediately before 28 September 2026, re-verify that the change is now correctly reflected, given that the update specifically targets synchronization at login.
• Information intermediaries and software providers managing SEF access on a client's behalf should confirm no interruption or unexpected access change occurred during the DEMO-to-production cutover.
• Document the confirmation as part of standard SEF access-control governance, particularly for entities with segregation-of-duties requirements around who may submit or approve e-invoices.

Practical Implications

The release continues a pattern of incremental hardening of the SEF platform's administrative and access-control layer, running alongside — but separate from — the legal changes introduced by the Law on Amendments and Supplements to the Law on Electronic Invoicing (Official Gazette RS No. 80/2026), which KGT covered on 21 September 2026. For multinationals, the practical takeaway is that access governance for SEF now depends on two systems staying synchronized rather than one, which is a housekeeping item for internal controls and SOD reviews rather than a new compliance obligation.

Expected Next Steps

KGT will continue to monitor efaktura.gov.rs/tekst/5421 ("SEF ažuriranja i verzije") for further SEF and SEF Admin point releases, and the subordinate acts due under Articles 2 and 3 of Law 80/2026 by 8 March 2027, which will add further detail to the farmer purchase-recording and customs-declaration-list obligations covered in KGT's 21 September 2026 update.

How Can KGT Support You?

KGT helps multinationals keep SAP-integrated e-invoicing and SAP Document and Reporting Compliance (DRC) landscapes aligned with fast-moving platform changes like this one — including validating that delegated user-access models in markets such as Serbia remain correctly synchronized between administrative and transactional environments, and monitoring authority release channels as part of an ongoing managed e-invoicing and SAF-T compliance service.

This article is provided for general informational purposes and does not constitute tax, legal, or professional advice. Businesses should seek advice specific to their circumstances before acting on this information.