Serbia Prepares Preliminary VAT Returns as SEF Tax Controls Expand in 2027

Serbia is preparing to expand the role of its electronic invoicing infrastructure by using data already collected through the SEF electronic-invoice system to generate preliminary VAT returns for businesses. Proposed amendments to the Law on Electronic Invoicing, currently before parliament, would introduce preliminary VAT returns based on information stored in SEF, while also expanding electronic records covering exports and certain purchases from agricultural producers.

Most provisions are scheduled to apply from 1 January 2027, while additional customs and agricultural-purchase requirements are planned from 1 July 2027. The legislation has not yet been finally adopted, but implementing rulebooks are already establishing the forms and data architecture required for the new system. The changes would move Serbia’s electronic invoicing framework beyond transaction documentation toward a model in which tax authorities can construct an initial picture of a company’s VAT position before the taxpayer submits its formal return.

SEF data will become part of VAT reconciliation

Under the existing approach, companies generally compile their transaction information internally, calculate taxable sales, input and output VAT, and submit the resulting figures to the authorities. The proposed system would alter that sequence. SEF already receives transaction-level invoice information. Customs systems record imports and exports, electronic fiscalisation captures retail transactions, while companies maintain corresponding accounting and commercial records in their internal systems. The next stage involves comparing these datasets.

For taxpayers, this means the information used to prepare a VAT return will increasingly be compared with information already available to the state. Differences between systems could consequently become easier to identify before a formal tax audit. The reform therefore shifts compliance toward continuous reconciliation rather than relying primarily on periodic declarations.

Corporate ERP systems face greater scrutiny

Enterprise resource planning systems remain the principal internal source of financial information for many large companies, covering areas such as procurement, sales, inventory, accounting and taxation. SEF introduces an external transaction record against which those internal systems can be checked.

ERP-SEF reconciliation is consequently becoming a core financial control. An invoice recorded internally but absent from SEF could create one discrepancy, while an invoice appearing in SEF but recorded differently in the company’s accounts could create another. Tax rates, invoice dates, cancellations and credit notes can also produce mismatches. As preliminary VAT calculations become increasingly automated, businesses will have less room for unresolved differences between their internal records and the information held by the authorities.

Some companies may therefore need to move beyond monthly reconciliation toward weekly or even daily monitoring of SEF exceptions. This is also likely to increase demand for software capable of automatically comparing ERP and SEF records, moving tax teams away from manual data preparation and toward exception management.

Customs integration will affect cross-border businesses

The planned expansion of customs-related information from 1 July 2027 will be particularly relevant to manufacturers, importers and exporters.

Cross-border transactions frequently involve several separate records, including commercial invoices, customs declarations and accounting entries. Timing differences can arise when goods cross the border in one reporting period while the associated invoice is booked in another. Customs values may also differ from commercial invoice amounts, while freight, insurance and currency conversion can affect the calculation of the taxable base.

Export documentation must additionally support the relevant VAT treatment. Greater integration of customs information into the digital tax environment would allow authorities to compare the movement of goods with commercial documentation and the VAT treatment recorded by the taxpayer. The customs system can show that goods crossed the border, SEF can contain related commercial documentation, the VAT return can show the tax treatment and the accounting ledger records the financial transaction. Differences between these records would consequently become more visible.

Export manufacturers face tighter documentation requirements

The change is particularly relevant to Serbia’s export-oriented manufacturing companies, many of which process thousands of invoices involving domestic purchases, imported components, intra-group services, export sales and logistics operations. Those transactions can have different VAT treatments, including zero-rated exports, domestic taxable supplies and input VAT associated with purchases and imports.

A preliminary VAT model would bring these transactions into a more closely connected data environment.

For businesses with well-integrated systems, this could make reconciliation more efficient. Better transaction evidence could also support the validation of VAT refund claims. For companies with fragmented systems, however, discrepancies between customs data, SEF and accounting records could result in additional queries or delays in processing refunds. That issue is significant for businesses carrying substantial input-VAT balances, because delayed recovery can create additional working-capital costs.

Digital records strengthen VAT enforcement

The proposed framework also provides the Tax Administration with a more systematic way to identify potential inconsistencies. VAT is a major source of Serbian budget revenue, making improvements in compliance financially significant. Electronic invoicing already limits the scope for certain undeclared transactions between registered companies by creating a digital record.

Preliminary VAT returns would extend that capability by allowing authorities to compare reported figures with transaction data already available through SEF and other systems. For example, differences could emerge when reported taxable sales are substantially below invoice data, input VAT rises without corresponding supplier activity, customs imports do not correspond with accounting records, or invoice cancellations repeatedly occur close to reporting deadlines.

Such patterns would not automatically establish wrongdoing, but they could serve as indicators for further review. Data analysis could consequently allow the Tax Administration to focus audits more heavily on higher-risk taxpayers rather than applying the same level of scrutiny across the entire business population.

Accounting functions will become more data-focused

Digitalisation is changing the work performed by corporate accounting teams.

Invoices are increasingly processed electronically, VAT information can be populated automatically and preliminary returns will draw on centrally available transaction data. The accountant’s role therefore shifts toward data validation, discrepancy investigation and tax-treatment assessment.

For large companies, tax departments may increasingly operate as internal control functions, monitoring system interfaces and documenting exceptions. Smaller businesses may instead rely on accounting-service providers to manage digital reconciliation, potentially increasing pressure on those providers to invest in software and automated processes. Companies and accounting firms that cannot efficiently manage these digital controls could face higher compliance costs.

Serbia is connecting several fiscal databases

The SEF reform forms part of a broader digitalisation of Serbia’s tax infrastructure. Electronic fiscalisation records retail transactions. SEF records business invoices. Customs systems document international goods movements, while the Tax Administration receives corporate and VAT returns.

The significance lies increasingly in the ability to compare these sources. A standalone database provides information about one type of activity. Connected datasets can reveal inconsistencies between different stages of the same transaction. The proposed preliminary VAT return reflects this approach because taxpayers will increasingly be confirming or reconciling information that the authorities already possess rather than supplying information entirely from scratch.

Companies need consistent transaction data

The expansion of digital tax controls increases the importance of data governance within businesses. Many companies maintain separate systems for commercial operations, finance, procurement, inventory, customs and invoicing. SEF adds another digital record to this chain. If these systems are not synchronised, discrepancies can arise. Businesses will therefore need accurate customer VAT numbers, properly configured product tax categories and consistent invoice dates and reporting periods.

Credit notes and cancellations must also be linked correctly to the original transactions, while foreign-currency conversions need to follow consistent procedures. For a manufacturer processing 50,000 invoices a year, even a relatively small error rate can create hundreds of transactions requiring investigation. The increasing automation of tax reporting therefore depends on the quality of the underlying corporate data.

CFOs face an enterprise-wide implementation task

The transition is likely to require involvement well beyond tax departments. Companies will need coordination among tax, accounting, IT, procurement, sales, customs and internal audit functions. The process begins with mapping which systems generate different types of transaction data and identifying how those records reach SEF and other relevant platforms.

Businesses can then test their internal records against SEF information and investigate recurring differences. Those differences may result from system configuration, process weaknesses or legitimate timing differences, but each category requires appropriate documentation. Correction procedures will also need to be tested. Changes to invoices, advance payments, credit notes and cancellations must be reflected consistently across the ERP, SEF and VAT reporting processes.

The January 2027 implementation requires early preparation

The main provisions are scheduled to take effect on 1 January 2027, leaving businesses a limited preparation period. ERP changes can require several months of development, testing and deployment, particularly within large industrial groups operating complex production environments.

Companies also need time to train employees, revise internal procedures and coordinate with accounting providers, customs brokers and other external partners. The year-end period can place additional pressure on finance teams. The publication of implementing rulebooks and the development of the new data architecture give companies an opportunity to test their systems before the new requirements become operational.

Digital reporting will expose errors earlier

As more transaction information reaches the authorities electronically, discrepancies can emerge sooner than under traditional reporting arrangements. An incorrect transaction that might previously have remained unnoticed until a month-end process or later audit could become visible when different datasets are automatically compared. Efficient correction procedures will therefore become increasingly important.

Companies process large volumes of transactions, and ordinary operational mistakes are unavoidable. The system will need to distinguish those errors from indicators of deliberate non-compliance. The effectiveness of the new framework will consequently depend not only on data collection but also on how efficiently businesses can correct legitimate discrepancies.

Agricultural purchases enter the wider digital framework

The proposed expansion of electronic records for certain purchases from agricultural producers will extend the digital tax framework into another part of the economy. Agricultural transactions can involve different documentation requirements and tax treatment from conventional corporate purchases.

Food processors, grain traders, dairies and other agribusiness companies may therefore need to adapt purchasing and accounting processes to the new electronic records. Bringing more transactions into structured digital records would increase visibility across supply chains that can be more fragmented than those of large corporate manufacturers.

Digital tax data could influence corporate financing

The growing volume of structured transaction information may eventually have implications beyond tax compliance. Electronic invoices contain information about corporate sales and receivables, potentially supporting areas such as factoring, supply-chain finance and working-capital lending. Banks traditionally rely heavily on financial statements and other information that may not reflect the most recent trading activity.

More current digital transaction records could support more data-driven assessment of corporate activity if appropriate access frameworks are established. For companies with reliable transaction histories but limited physical collateral, such information could become relevant to financing decisions. The immediate purpose of the SEF reform is tax administration, but the underlying digital infrastructure has potential applications across corporate finance.

Smaller companies could face higher adjustment costs

Large companies generally have greater capacity to implement the new requirements because they can draw on tax specialists, ERP teams and dedicated technology budgets. Smaller businesses may rely heavily on external accountants and have fewer resources for sophisticated reconciliation systems.

The cost and usability of software, standardised interfaces and clear administrative guidance will therefore be important for smaller taxpayers. If digital controls are designed around the capabilities of large corporations, smaller companies could face disproportionately high compliance costs. The objective of digitalisation is to reduce administrative work over time, but that depends on ensuring that data-processing requirements do not simply shift from public institutions to businesses.

Tax compliance is becoming a corporate governance issue

As tax information moves through interconnected systems, digital tax controls increasingly overlap with broader internal-control frameworks. Boards and audit committees may need greater visibility into the quality of SEF reconciliation and the reliability of links between tax and financial systems. Internal auditors can test whether SEF data correspond with accounting records, while external auditors may examine the consistency of tax information with financial reporting.

SEF data quality could also become relevant during corporate transactions and due diligence because weaknesses in transaction records can expose companies to potential tax liabilities. Electronic invoicing has consequently evolved beyond an administrative function into an element of corporate risk management.

Serbia is moving toward continuous VAT control

The proposed preliminary VAT return represents a broader shift toward continuous transaction-based tax administration. Under the traditional model, taxpayers prepare declarations and authorities subsequently review them. A digitally connected model allows authorities to receive transaction information closer to the time economic activity occurs and use it to construct an initial tax position.

Periodic VAT returns remain part of the process, but their role changes when much of the underlying information is already available to the state. The planned 1 January 2027 implementation therefore represents more than another electronic-invoicing update. For businesses, the immediate requirement is to ensure that their ERP, SEF, customs and accounting records remain consistent as Serbia moves toward a VAT system in which the authorities can increasingly establish a preliminary tax position before the taxpayer files its formal return.