VAT, VIES, OSS and Intrastat: what are the differences?

Starting or managing a business with international operations requires a clear understanding of tax and reporting obligations. Those who decide to start a company in Bulgaria and work with customers or suppliers in other EU countries are often faced with complex terminology: VAT return, VIES, OSS and Intrastat.

These are distinct requirements with different purposes, which may apply simultaneously to the same company. Understanding their role and correct scope of application is essential to avoid errors, omissions and tax audits.

This content explains how these tools work, when they are mandatory and how they fit into the Bulgarian and European compliance framework.

The VAT compliance system in Bulgaria: an overview

In the Bulgarian context, the VAT return, VIES, OSS and Intrastat do not operate as independent forms, but as parts of a coordinated control system.

From 2026, with the adoption of the euro, all communications are made in EUR and cross-checks between different filings have become faster and more automated. The tax authorities regularly compare the data reported in the various returns to identify inconsistencies.

In this scenario, accurate classification of transactions is just as important as the correct calculation of tax.

Why VAT, VIES, OSS and Intrastat are often confused

The confusion arises because these obligations share several common elements. They are all linked to intra-EU transactions, require VAT registration and are managed by the Bulgarian tax authority (National Revenue Agency – NRA). In addition, a single commercial transaction may generate multiple reporting obligations.

What is often unclear is that these reports do not replace one another. Each serves a specific function: tax, informational or statistical. Failing to comply with one of them, even if the others are correctly submitted, is one of the main causes of issues during tax inspections.

Understanding the differences from the outset allows companies to set up their administrative processes correctly and avoid later adjustments.

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VAT return: the cornerstone of tax compliance

The VAT return is the foundation of tax compliance in Bulgaria. Through this report, the amount of VAT payable or recoverable for each reporting period is determined, including both domestic and cross-border transactions.

Every VAT-registered entity is required to submit a VAT return, regardless of whether it operates exclusively within Bulgaria or also in other Member States. This document has a purely tax function and does not replace other informational or statistical obligations.

VIES: monitoring intra-EU B2B transactions

The VIES statement is used to report supplies of goods and services between taxable persons established in different EU countries, where the reverse charge mechanism applies.

Its purpose is to allow tax administrations in the various Member States to verify consistency between what is declared by the supplier and what is reported by the customer. VIES applies exclusively to B2B transactions and does not cover sales to final consumers.

OSS: simplification for B2C sales within the European Union

The OSS (One Stop Shop) scheme was introduced to reduce the complexity of VAT management for cross-border B2C sales. It allows VAT due in multiple Member States to be declared and paid through a single, centralized return, avoiding multiple VAT registrations.

It is important to note that OSS covers only specific B2C transactions and does not apply to transactions between businesses. Moreover, opting into the OSS scheme does not remove the obligation to file the domestic VAT return for other transactions.

Intrastat: statistical reporting of goods movements

Intrastat is not a tax return, but a statistical tool designed to monitor the physical movement of goods within the European Union. It becomes mandatory only when certain annual thresholds for dispatches or arrivals are exceeded.

This obligation applies exclusively to goods and not to services. Although it does not involve the calculation of VAT, Intrastat data are frequently cross-checked against VAT returns, making consistency between the different information flows essential.

The most common combinations of obligations in practice

In day-to-day operations, most businesses do not submit just one report, but a combination of several filings. For example, intra-EU B2B transactions generally require both the VAT return and the VIES statement. B2C sales in multiple EU countries may involve the combined use of the VAT return and OSS. Exceeding Intrastat thresholds adds a further layer of reporting.

Submitting one form does not automatically exempt a business from other applicable obligations.

One of the most common misconceptions is the belief that one requirement “covers” the others. In reality, OSS does not replace VIES, the VAT return does not replace Intrastat, and Intrastat has no tax function at all. Likewise, VIES does not apply to B2C transactions. Most irregularities arise precisely from these incorrect assumptions.

Read also: Corporate Accounting Obligations in Bulgaria

Evolution of controls and the introduction of SAF-T

From 2026, the gradual introduction of SAF-T in Bulgaria has increased the transparency of accounting data available to the tax authorities. This tool does not replace VAT, VIES, OSS or Intrastat, but allows for a more in-depth analysis of the underlying information.

For companies with high volumes, complex supply chains or advanced ERP systems, alignment between accounting records and tax filings has become a crucial aspect of tax management.

VAT return, VIES, OSS and Intrastat are not alternatives to one another, but complementary layers of the European VAT compliance system. Understanding their differences and interactions helps reduce the risk of penalties, audits and retroactive corrections.

For businesses operating cross-border, regulatory clarity is not an option, but a form of protection.

In this context, Accountancy Bulgaria, Tax advisor in Bulgaria supports entrepreneurs and companies in the correct management of all VAT and reporting obligations, from transaction analysis to the preparation of mandatory filings and alignment with SAF-T requirements. A structured and professional approach allows businesses to focus on growth, leaving compliance to experts with in-depth knowledge of the local and European tax systems.