23 June 2016 - Referendum
The UK votes in a referendum to leave the EU by 52% to 48%.
Timeline and Key Documents
Click or tap on the links below to go to:
- The Timeline - key events following the referendum on EU membership.
- Future Dates - View the important upcoming dates relating to EU Exit, including the Assembly’s democratic consent vote on the Protocol on Ireland/Northern Ireland.
The Timeline
This is a timeline outlining the key events following the referendum on EU membership. It also provides links to key documents and legislation relating to the negotiations and EU Exit.
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29 March 2017 - Article 50
Then UK Prime Minister Theresa May triggers Article 50, the legal mechanism for a Member State to leave the EU.
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19 June 2017 - Negotiations begin
Negotiations begin between the UK Government and Michel Barnier, on behalf of the EU.
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9 December 2017 - Joint Report
The UK and EU release a Joint Report on their agreement in principle on citizens’ rights, the unique circumstances in Northern Ireland, and the financial settlement.
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26 June 2018 - EU Withdrawal Bill
The European Union (Withdrawal) Bill 2018 receives Royal Assent.
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21 June 2019 - North South Cooperatation
Publication of the mapping exercise on North – South cooperation carried out during Phase 1 of the negotiations by the UK and EU.
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17 October 2019 - Withdrawal Agreement and Political Declaration
Agreement is reached between the negotiators on the Withdrawal Agreement, including the Protocol on Ireland/Northern Ireland and Political Declaration.
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11 January 2020 - Assembly Restored
The Northern Ireland Assembly is restored with the ‘New Decade, New Approach’ agreement.
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23 January - Withdrawal Bill receives Royal Assent
The European Union (Withdrawal Agreement) Bill 2020 receives Royal Assent.
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24 January 2020 - Withdrawal Agreement signed
The Withdrawal Agreement is signed by the EU and UK.
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31 January 2020 - UK leaves the EU
The United Kingdom officially leaves the European Union at 11pm.
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1 February 2020 - Transition period begins
The Withdrawal Agreement enters into force and the UK enters the transition period.
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2 March 2020 - Negotiations on Future Relationship
Negotiations on the Future Relationship formally begin.
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30 March 2020 - First meeting of Joint Committee
The first meeting of the Withdrawal Agreement Joint Committee is held. The Committee oversees the implementation of the Withdrawal Agreement and Protocol on Ireland/Northern Ireland.
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1 December 2020 - Joint Committee adopts decisions on the Protocol
The Joint Committee adopts decisions providing clarity on outstanding issues relating to the Protocol.
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24 December 2020 - EU and UK reach a deal
EU and UK negotiators reach a deal on a future relationship.
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30 December 2020 - Future Relationship Bill receives Royal Assent
The European Union (Future Relationship) Bill 2020 receives Royal Assent.
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1 January 2021 - EU-UK Trade Agreement
The transition period ends and the EU-UK Trade and Cooperation Agreement provisionally enters into force.
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3 March 2021 - UK extends grace periods
UK unilaterally takes ‘temporary technical steps’ to extend until 1 October grace periods relating to the Protocol on Ireland/Northern Ireland.
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15 March 2021 - EU Legal Action
Following the UK’s unilateral move, the EU launches legal proceedings against the UK. In light of the Windsor Framework, the EU did not proceed with its legal action.
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27 April 2021 - European Parliament ratifies deal
The European Parliament ratifies the EU-UK Trade and Cooperation Agreement, passing an accompanying resolution.
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21 July 2021 - UK Command Paper
The UK Government publishes a Command Paper on its proposed approach to the Protocol.
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6 September 2021 - Grace periods extended
The UK Government announced it will continue to operate the Protocol on the current basis, including the grace periods currently in force.
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13 October 2021 - Commission proposals
The European Commission publishes proposals on engagement with Northern Ireland stakeholders and authorities, customs, Sanitary and Phytosanitary (SPS) issues and medicines. The UK and EU then entered intense negotiations on the Protocol.
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17 December 2021 - Medicines supply under the Protocol
The European Commission puts forward proposals to ensure the continued long-term supply of medicines from Great Britain to Northern Ireland.
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April 2022 - Medicines supply under the Protocol
The European Parliament and the EU Council approved changes to EU law which aim to guarantee the continued supply of medicines to Northern Ireland.
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12-13 May 2022 - EU-UK Parliamentary Partnership Assembly (PPA)
The first meeting of the EU-UK Parliamentary Partnership Assembly (PPA) took place in Brussels.
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13 June 2022 - Northern Ireland Protocol Bill
UK Government published the Northern Ireland Protocol Bill, which would disapply core parts of the Protocol relating to trade in goods, subsidy control, the role of the Court of Justice of the EU, plus allow changes to VAT. In light of the Windsor Framework, the UK did not proceed with the NI Protocol Bill, which falls at the end of the parliamentary session.
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15 June 2022 - EU Responds with legal action
The EU launched infringement proceedings against the UK “for breaking international law”. It also published additional details on its solutions of October 2021 to ease movement of goods between GB and NI (EU position papers on customs and sanitary and phytosanitary issues). Following the conclusion of the Windsor Framework, the EU stated, “there will no longer be grounds for the existing Commission legal proceedings against the United Kingdom relating to the Protocol on Ireland / Northern Ireland.”
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July 2022 - UK legislation and EU legal action
The Northern Ireland Protocol Bill completed its stages in the House of Commons and proceeded unamended to the House of Lords. The European Commission launched four new infringement procedures against the UK for not properly implementing the Protocol. In light of the Windsor Framework, the UK and EU did not proceed with their respective legal actions.
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22 September 2022 - Retained EU Law Bill
The Retained EU Law Bill was introduced to Parliament.
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4 October 2022 - Civil Society Forum
The first meeting of the Civil Society Forum was held in Brussels.
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9 January 2023 - EU-UK data-sharing agreement
The UK and EU reach an agreement on sharing trade data.
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27 February 2023 - The EU and UK agree in principle the ‘Windsor Framework’
The UK Government and European Commission reach an agreement in principle on the Protocol on Ireland/Northern Ireland, called the Windsor Framework. This revises the Protocol in a number of areas and covers customs, agri-food, medicines, VAT and excise, plus a new mechanism for the involvement of the NI institutions.
Future Dates
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Date |
Action |
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September 2023
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Windsor Framework: the new trusted trader scheme, through which businesses can access the green lane to move goods GB-NI, is set to be in place. *Certain conditions are to be fulfilled e.g. EU access to UK customs databases and IT systems |
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October 2023 |
Windsor Framework: enhanced SPS inspection facilities to be in place in Northern Ireland |
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From 1 October 2023
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Windsor Framework: Prepacked meat and fresh dairy (from GB for sale in NI) should be individually labelled as ‘not for EU’. The UK Government has stated it will provide “transitional reimbursement funding” during this first phase. Identity checks will be reduced to 10% of all consignments of retail goods. |
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31 October 2023 |
UK border controls: Export health certificates and phytosanitary certificates are introduced for medium-risk animal products, and plant and plant products imported to GB from the EU. This also applies to Irish products moving directly from Ireland to GB, and full customs controls will also be introduced for these goods. |
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31 December 2023 |
Under the Retained EU Law Bill, the majority of retained EU law would expire, unless preserved. |
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31 January 2024 |
UK border controls: Documentary checks and physical and identity checks are to be introduced for medium-risk animal products, plant and plant products imported to GB from the EU. |
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Date to be confirmed in the final Border Target Operating Model* |
UK border controls: Introduction of SPS documentary, physical and identity checks; and Safety and Security declarations for goods moving directly from Ireland to GB.
*to be published by the UK Government later in 2023 |
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By 31 July 2024
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Windsor Framework: The UK should give the European Commission a progress report on the completion of SPS inspection facilities in NI (and then every three months until the requirements are met). |
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From October 2024 |
Windsor Framework: Scheme for business to consumer parcels (authorisation and monitoring of carriers) should be in place. |
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From October 2024 |
Windsor Framework: labelling requirements extended to all dairy products, such as UHT milk and butter. The Government would propose the application of this across the UK from this point, in consultation with the Scottish and Welsh Governments. The frequency rate of identity checks on retail goods consignments will be further reduced to 8%. |
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31 October 2024 |
UK border controls: Safety and Security declarations to be introduced for EU imports. |
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31 December 2024 |
By this date, the first vote will take place in the Northern Ireland Assembly on the continued application of Articles 5-10 of the Protocol on Ireland/Northern Ireland, as outlined in the democratic consent mechanism. Read our explainer on the consent mechanism. |
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31 December 2024 |
Businesses need to start using the UK's new product safety marking - UKCA Conformity Assessed (UKCA). Under the Protocol, the CE marking will continue to be recognised for goods sold in Northern Ireland. |
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1 July 2025
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Windsor Framework: final SPS inspection facilities should be in place in Northern Ireland. |
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From 1 July 2025 |
Windsor Framework: all retail goods (other than goods sold loose) should be individually labelled (with some exceptions for those not subjected to EU official controls (e.g. confectionery, chocolate, pasta, biscuits, coffee). The rate of identity checks on retail goods consignments will be reduced to 5%. |
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31 December 2025 |
The grace period for veterinary medicines ends. By this date, the UK must ensure that supplies of veterinary medicines to Northern Ireland conform with relevant EU law and the provisions of the Protocol. |
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31 December 2025 |
First review of the EU-UK Trade and Cooperation Agreement, to take place every five years. |
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30 June 2026 |
Adjustment period for fishing ends, annual negotiations on access to fishing waters begin. |
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By 1 January 2027 |
Windsor Framework: review of Enhanced Coordination Mechanism on Vat and Excise to take place. |
