The recent agreement between the UK, Spain, and the EU concerning Gibraltar's post-Brexit status has introduced new border control measures. These changes mean Spanish authorities will now conduct checks on individuals arriving in Gibraltar, a shift from previous arrangements. This development stems from the end of the Brexit transition period, which necessitated a new framework for the relationship between Gibraltar, Spain, and the European Union. The deal aims to facilitate the free movement of people and goods while establishing a clear border regime.

New Border Protocol Introduces Spanish Checks
A key element of the newly agreed post-Brexit framework for Gibraltar involves Spanish authorities conducting checks on arrivals. This new protocol will apply to individuals entering Gibraltar, and importantly, Spanish border guards will have the ability to deny entry on security grounds. This is part of a broader treaty aimed at establishing a practical and lasting solution for Gibraltar's relationship with the EU following the UK's departure.
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Passport Checks: British travellers heading to Gibraltar will be required to present their passports to Spanish border guards.
Entry Veto: Spain will gain the power to veto the entry of British travellers into Gibraltar, particularly if concerns arise regarding security.
Residency Permits: The treaty also outlines provisions where Spain can refuse residency permits for individuals seeking to live in Gibraltar on security grounds.
Dual Checks: Arrangements are in place for dual checks at Gibraltar's airport and port, involving both Spanish and British officials. This is seen as a method to remove the need for a hard land border.
Security Cooperation: The agreement includes provisions for close cooperation between Spanish and British law enforcement agencies.
Facilitating Movement and Trade
Despite the introduction of new checks, the overarching goal of the agreement is to ensure the continued free movement of people and goods across the Gibraltar-Spain border. Approximately 15,000 people, many of whom are Gibraltar's workforce, cross this border daily. The deal seeks to maintain this flow without routine passport stamps for those commuting daily.

Free Movement of People: The treaty aims to enable free travel across the land border between Spain and Gibraltar for the daily commuters.
Goods Movement: Goods destined for Gibraltar will now pass through Spain, with Spanish authorities conducting customs and baggage controls. This is to ensure security and compliance with EU regulations.
Alignment on Duties: Gibraltar is set to align its import duty rates with those of the EU. This is intended to allow individuals to cross the border with everyday goods without additional declarations or charges.
Environmental Rules: Gibraltar will also adopt EU environmental rules and legislation as part of the agreement.
Timeline and Implementation
The agreement on Gibraltar's post-Brexit status follows years of negotiation. The political deal was reached in June of the previous year, and the details of how the new arrangements will function have been confirmed in a draft treaty. The intention is to provisionally apply the deal, with Gibraltar hoping for its implementation to coincide with the operationalization of the EU's new border system, scheduled for April 10th. The full treaty text, comprising over 1,000 pages, has been published to allow for scrutiny.
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Treaty Publication: A draft treaty, detailed and extensive, has been published, outlining the specifics of the new border arrangements.
Provisional Application: Gibraltar is aiming for a provisional application of the deal from April 10th.
Ratification Needed: The treaty, in its draft form, still requires signing, ratification, and full implementation by all parties.
Negotiation Period: The negotiations for a post-Brexit deal for Gibraltar have been ongoing for over five years.
Reactions and Implications
Official statements from the UK and Gibraltar highlight the "historic" and "practical" nature of the agreement. The UK government asserts that the deal protects British sovereignty and supports Gibraltar's economy. However, there are indications that the new arrangements could allow Spain to have a say in who enters Gibraltar.
UK Government Stance: The Foreign Office has stated that the treaty ensures Gibraltar's economy, people, and future are protected as an integral part of the British family.
Gibraltar's Hope: Gibraltar's government has expressed optimism about the provisional application of the deal.
Schengen Controls: Spain is taking over Schengen controls at Gibraltar Airport and Port, a significant shift in operational responsibility.
Concerns about Alignment: Some have raised concerns regarding Gibraltar's "dynamic alignment" with EU regulations, which involves automatically updating domestic laws to match EU standards.
Expert Analysis
The agreement represents a complex balancing act between maintaining Gibraltar's British identity and integrating it into the broader European border framework. By allowing Spain to conduct checks, the EU aims to ensure the integrity of the Schengen area. For Gibraltar, this deal appears to be a pragmatic solution to avoid a hard border and ensure economic stability. The inclusion of provisions for Spanish veto power on entry and residency highlights a nuanced approach to shared sovereignty in border management.
Conclusion
The newly established post-Brexit agreement for Gibraltar introduces a new era of border controls, with Spanish authorities playing a direct role in managing arrivals. This treaty, the culmination of lengthy negotiations, seeks to balance the free movement of people and goods with security requirements. While the deal aims to provide a stable and practical framework, the specifics of Spanish involvement in entry decisions and the ongoing process of ratification will be critical in shaping its long-term impact on Gibraltar and its relationship with Spain and the EU.
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Sources:
BBC News: https://www.bbc.co.uk/news/articles/cgjz1x5e1xyo - Provides details on passport checks and the provisional application date.
The Guardian: https://www.theguardian.com/politics/live/2026/feb/26/gorton-and-denton-byelection-green-party-labour-reform-uk-politics-latest-news-updates - Confirms free travel across the land border and the agreement on a "practical and lasting solution."
Daily Mail: https://www.dailymail.co.uk/news/article-15595399/Spain-able-block-Brit-travellers-entering-Gibraltar-post-Brexit-treaty.html - Details Spain's ability to veto entry and refuse residency permits on security grounds.
TravelWeekly: https://travelweekly.co.uk/news/historic-post-brexit-deal-over-gibraltar-to-ease-border-controls - Mentions dual checks at port and airport and the removal of checks on people and goods.
Sur in English: https://www.surinenglish.com/spain/spain-and-the-seal-postbrexit-agreement-gibraltar-20260226111038-nt.html - States Spain handles Schengen controls at Gibraltar's airport and port, and outlines customs controls on goods.
Echo News: https://www.echo-news.co.uk/news/national/25890545.gibraltar-remain-british-uk-eu-hail-post-brexit-treaty/ - Reaffirms no routine passport checks and Gibraltar remaining British.
Real Instituto Elcano: https://www.realinstitutoelcano.org/en/commentaries/spain-and-the-uk-deepen-bilateral-ties-within-a-strategic-framework/ - Provides context on the broader UK-Spain relationship and the removal of border checks.
The Telegraph: https://www.telegraph.co.uk/world-news/2025/06/20/spain-given-power-over-gibraltar-visas-brexit-deal/ - Explicitly mentions Spain's new powers over visas and residency permits.
BBC News (Article 11): https://www.bbc.com/news/articles/cd903neydwjo - Reports on the UK-EU deal, stressing protected sovereignty and avoided border checks.