The agreement signed in February 2026 between the EU and the UK eliminates the land border between Gibraltar and Spain, integrating this 6.7 km² territory into the Schengen area – a pragmatic response to five years of post-Brexit negotiations.
The treaty is based on an unprecedented hybrid model: Madrid exercises “functional sovereignty” through Spanish agents deployed at the airport and port, without formally questioning the British legal sovereignty inherited from the Treaty of Utrecht in 1713.
The agreement remains fragile: a political change in Spain, regulatory divergences between London and Brussels, or tensions related to the British military presence could jeopardize ratification scheduled even until 2027.
The announcement at the beginning of 2026 of the agreement on Gibraltar between the European Union and the United Kingdom marks a major turning point in the contemporary history of this 6.7 km² territory located at the southern tip of the Iberian Peninsula. The result of over five years of negotiations involving Brussels, London, Madrid, and the Gibraltar government, this treaty exceeding a thousand pages aims to resolve one of the most sensitive consequences of Brexit: the existence of a land border between this British overseas territory and the Schengen area.
Beyond its technicalities, the text redefines the political and economic balances in the region. In fact, it is less of a classic compromise than a hybrid model based on a dissociation between legal sovereignty and functional management of the territory.
Gibraltar, a strategic legacy centuries old
The current situation has its roots in the Treaty of Utrecht in 1713, through which Madrid ceded Gibraltar “in perpetuity” to London at the end of the War of Spanish Succession. However, this cession remains disputed, as Madrid considers only the initial fortified perimeter to be involved, excluding the isthmus where today the airport of this strip of land is located.
In the twentieth century, Gibraltar gradually acquired autonomous institutions. Two referendums, in 1967 and 2002, confirmed by over 99% the refusal of any return to Spanish sovereignty by the inhabitants. Since the 2006 Constitution, the territory also has a government and a Parliament, while London retains control over all defense affairs and foreign policy.
The shock of Brexit: an existential threat
The 2016 referendum on the UK’s exit from the European Union profoundly weakened this balance. While 52% of Britons voted to leave the EU, 95.9% of Gibraltarians chose to remain. This divergence illustrates the structural dependence of the territory on its European environment.
Indeed, every day, around 15,000 workers cross the border with Spain, including nearly 10,000 Spaniards, who represent more than half of the local workforce.
In an Andalusia still marked by high unemployment (18.53% in the whole autonomous community at the end of 2025 and nearly 30% for the border town of La Línea de la Concepción), Gibraltar is therefore an essential economic engine. At the same time, this British territory could not function without workers coming from Spain.
A no-deal Brexit would logically result in the application of the European “Entry/Exit” system (EES), with biometric controls and massive queues, directly affecting local activity. This is based on high value-added sectors, such as online gaming (about 25% of GDP for more than 3,000 jobs), financial services, tourism (up to 10 million annual visitors), and port businesses.
Five years of high-stakes negotiations
As of December 31, 2020, a preliminary agreement laid the foundations for a future status based on Gibraltar’s integration into the Schengen area and the transfer of controls to the port and airport.
Between 2021 and 2024, eighteen rounds of discussions addressed more sensitive points, including the presence of Spanish agents on the territory and the status of the Gibraltar airport, which houses a Royal Air Force base.
A decisive acceleration occurred in 2025 with a political agreement in June followed by its legal finalization in December. The publication of the treaty on February 26, 2026, came under the pressure of a crucial deadline, namely the entry into force of the EES system scheduled for April 10th.
The end of the Verja or a mobility revolution
The heart of the treaty lies in the removal of the physical border (the famous Verja, a Spanish term literally meaning “grille”) between Gibraltar and Spain. The territory is thus integrated into a circulation area associated with Schengen, allowing total mobility of people.
Furthermore, controls are now transferred to the port and airport of this strip of land. Thus, travelers from third countries, including the UK, undergo a dual check, Gibraltar and Schengen, the latter being effectively ensured by Spain. A joint installation (nicknamed the “Schengen Shack”) enables this operational cooperation.
Regulated economic integration
On the commercial front, Gibraltar joins the European customs union, which eliminates goods controls at the land border. In return, the territory partially relinquishes its privileged tax status.
The major innovation in the field resides in the creation of a Transaction Tax, initially set at 15% and then increased to 17% in 2029 to compensate for the lack of local VAT and avoid unfair competition with Spain. In addition, excise duties on tobacco, alcohol, and fuels cannot deviate by more than 6% from Spanish levels, in order to combat smuggling.
Spain, operational pivot of the system
In any case, the treaty grants Madrid an unprecedented role. Spanish national police agents will be permanently deployed at the Gibraltar airport and port with final decision-making power on the entry of foreign travelers into the Schengen area.
Our Iberian neighbor also becomes the obligatory passage point for goods through logistical nodes located in Algeciras (main Spanish merchant port) and La Línea de la Concepción. Finally, Spain supervises health checks and can oppose certain residency requests in Gibraltar for security reasons.
As a result, this system reflects a form of “functional sovereignty” in which Madrid exercises concrete competencies without formally questioning British legal sovereignty.
A politically contested compromise in Spain
While the socialist government of Pedro Sánchez presents the agreement as a “historic milestone,” political reactions are mixed across the Pyrenees. The Popular Party (classic right) denounces an unbalanced text, arguing that Gibraltar benefits from community advantages without fully assuming the constraints.
Even more critical, Vox (right-wing “radical”) evokes a “historical betrayal” and fears a loss of security control in the region. Conversely, Andalusian economic and trade unions welcome an agreement that secures the jobs of the 15,000 cross-border workers.
An uncertain future
The agreement must now pass several decisive stages. Its provisional application is planned before April 10, 2026, while full ratification could extend until 2027, especially if European national parliaments need to be consulted.
Several risks remain in this regard: a political change in Spain due to new general elections, regulatory divergences between London and Brussels, or tensions related to the British military presence on site.
Gibraltar, a laboratory of twenty-first-century sovereignty
Beyond the Gibraltarian case, this text constitutes an unprecedented experiment. By dissociating legal sovereignty and operational management, it offers a pragmatic response to the challenges posed by Brexit.
The disappearance of the Verja thus symbolizes not only the end of a physical border several decades old: it also inaugurates a new form of European coexistence based on economic interdependence, security cooperation, and shared sovereignty in practice, if not in texts.
