What the DUA Is and Where It Comes From

The DUA is Spain's implementation of the EU-wide Single Administrative Document (SAD), which was introduced across the European Community in 1988 to replace the multitude of different national customs forms that previously existed. Today, the same basic document structure — with standardised boxes and procedure codes — is used across all EU member states and several neighbouring countries.

In Spain, the DUA is filed electronically with AEAT (the Spanish Tax Agency), which manages customs at Spanish ports, airports and land borders. The filing system is called TARIC for import-side look-ups, and SEPRA for the electronic submission of export declarations.

The DUA is a legal declaration. The declarant — the customs agent or the importer/exporter themselves — is legally responsible for the accuracy of the information submitted. Errors or omissions can result in additional duties being assessed, fines or, in serious cases, legal proceedings.

The Three Main Types of DUA

The same underlying form is used for different customs movements, distinguished by procedure codes:

Who Files the DUA?

In practice, the DUA is almost always filed by a licensed agente de aduanas (customs agent) — a professional with the authorisation and technical access to AEAT's systems, and the expertise to correctly classify goods, apply procedure codes and calculate duties. The customs agent acts as the importer's or exporter's representative before AEAT.

Importers and exporters can technically file their own DUA if they hold an EORI number and have access to AEAT's electronic systems, but the complexity of customs classification and the legal liability involved mean that the vast majority use an agent. Your freight forwarder will typically coordinate with a customs agent as part of the overall service.

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What Information Is in a DUA?

A DUA contains all the information AEAT needs to process the shipment and calculate any duties or taxes due:

Levante: Release of the Goods

Levante is the word used for the release of goods from customs control — the moment AEAT formally accepts the DUA and authorises the goods to circulate freely in Spain and the EU. It is what every importer is waiting for.

In the majority of cases, levante is granted automatically on electronic acceptance of the DUA. In some cases — selected at random or triggered by risk indicators — AEAT may request a documentary check (verification of the paperwork) or a physical inspection of the goods before levante is granted. Physical inspections add time but are a normal part of customs operations.

Frequently asked questions

DUA stands for Documento Único Administrativo — Single Administrative Document in English. It is the customs declaration filed with AEAT (the Spanish Tax Agency) for all imports, exports and transit movements of goods across the Spanish customs frontier. The same basic document structure is used across all EU member states.
The DUA de importación is filed when goods from outside the EU arrive in Spain and are cleared into free circulation — this is when customs duties and import VAT are assessed and paid. The DUA de exportación (also called EX1) is filed when goods leave Spain and the EU — its accepted confirmation proves the goods have left EU territory, which is required for VAT zero-rating on the export invoice.
In practice, almost always a licensed customs agent (agente de aduanas), acting on behalf of the importer or exporter. The agent has the technical access to AEAT's systems and the expertise to correctly classify goods and apply procedure codes. The importer or exporter can file directly if they have an EORI number and system access, but most use an agent. Your freight forwarder will coordinate this as part of the service.
Levante is the formal release of goods from customs control — the moment AEAT accepts the DUA and authorises the goods to circulate freely in Spain and the EU. In most cases it is granted automatically on electronic acceptance. In some cases AEAT requests a documentary or physical check before granting levante.
A DUA is required for all commercial imports from outside the EU above the de minimis customs duty threshold (€150). Low-value postal or courier shipments may use simplified procedures. Intra-EU movements between Spain and other EU countries do not require a DUA — there are no customs frontiers between EU member states, though Intrastat statistical reporting may apply for significant volumes.
EORI (Economic Operators Registration and Identification) is a unique identifier assigned to businesses that import or export goods within or to/from the EU. Any company acting as importer of record or exporter in Spain must have an EORI number — it appears on the DUA. Spanish companies can obtain one from AEAT. Non-EU companies that import regularly into Spain can also register for an EORI.