When will the next UK general election be?

To call an election before 17 December 2024, the prime minister must ask the monarch to dissolve parliament. In recent decades this has usually been done in a visit to Buckingham Palace, with the prime minister announcing the general election from the steps of Downing Street shortly after. Parliament is then typically dissolved a few days after the announcement to allow unfinished parliamentary business to be completed, known as ‘wash-up’. The ‘pre-election period’ (previously known as ‘purdah’) normally begins once the election is called, or shortly after, ^undefined House of Commons Library, (2023, March 10). Pre-election period of sensitivity, https://researchbriefings.files.parliament.uk/documents/SN05262/SN05262.pdf and places restrictions on government activity during the campaign.

The prime minister no longer needs parliament to vote for a general election, which was required between 2011 and 2022, after the Fixed-term Parliaments Act 2011 was repealed and replaced by the Dissolution and Calling of Parliament Act 2022.

Watch our video on possible scenarios for the next election

How will the prime minister decide when to call an election?

Prime ministers have called elections for various reasons in the past: to secure a mandate on a specific issue, to strengthen their authority in parliament, or because the five-year term has ended. In the past 40 years, governments have only tended to call an election before the end of the five-year term when confident of success. The party in power has won a majority on five of these six occasions (the exception being 2017).

The key factor most likely to determine when Rishi Sunak calls the next election is when he has the maximum chance of success. There are two overarching calculations he will make in judging this:

The strength of his political position

The Conservatives are trailing Labour in the polls, and the prime minister will want to narrow that gap before calling an election. In aiming to do so, he will consider:

• The economy: When the economy is doing badly, or has recently suffered a shock, incumbent governments tend to do worse in elections. ^undefined House of Commons Library, (2023, March 10). Pre-election period of sensitivity, https://researchbriefings.files.parliament.uk/documents/SN05262/SN05262.pdf  Sunak made the economy a focus of three of his five pledges. He met his target to halve inflation in October 2023, but recent Bank of England forecasts suggest inflation will continue to fall more slowly than previously predicted in 2024 and GDP growth will flatline. The Bank’s forecast suggests a 50% chance the UK economy goes into a recession in 2024. ⁸ www.bankofengland.co.uk/monetary-policy-report/2023/november-2023

• Delivery of other key pledges: Sunak also promised to cut NHS waiting lists and pass legislation to stop small boats. He did not specify which waiting lists he would target but the high-profile elective waiting list is still growing and industrial action by doctors continues, slowing progress on reducing it. Previous projections suggest the NHS elective waiting list may not fall until June next year. ¹¹ what next for NHS waiting lists?. London: Institute for Fiscal Studies. Available at: www.ifs.org.uk/publications/one-year-backlog-recovery-plan-what-next-nhs-waiting-lists

On small boats, although the government did pass legislation, as Sunak pledged to do, the government’s Rwanda plan was rejected by the Supreme Court and small boats crossings remain high. ¹² www.gov.uk/government/statistical-data-sets/irregular-migration-detailed-dataset-and-summary-tables  If the seasonal pattern of small boat crossings over the past three years were to continue, arrivals would reach their peak in late summer and be at their lowest over winter.

Sunak will want to use the next year to make progress on those pledges, or find a moment to pivot away from them.

• The broader political context: Beyond the five priorities, there are many potential events and issues that could affect Sunak’s poll ratings. Some may be hard to anticipate, such as an unexpected war or natural disaster. Some may be hard to anticipate, such as an unexpected war or natural disaster. Others are widely expected in the months ahead, including the first of the Covid-19 Inquiry’s interim reports.
• Labour’s performance: The opposition might begin to lose support because of its own decisions or behaviour, helping to rebalance the polls in Sunak’s favour. In 2017, Theresa May decided to call an election in part due to Labour’s poor poll ratings. Sunak may do the same if it looks like support for Labour is waning.

When he thinks the Conservative Party is ready to run the campaign

Election campaigns take time to plan and run. The Conservative Party must select candidates, including to replace the more than 50 sitting Conservative MPs standing down, and be ready to operate a campaign across the country and around each candidate. This requires funding, alongside a compelling political vision and manifesto to take to voters. Labour will also be preparing its campaign, and Sunak will want his party to be in as strong a position as possible relative to his opponents.

What are the most likely times for the general election?

There are broadly three scenarios for when the prime minister will hold an election:

1. An early election: most likely in May 2024.
2. A late election: held at the last possible moment, in January 2025.
3. An autumn 2024 election: giving the prime minister more time to narrow the gap in the polls, but not waiting the full course.

Early election: May 2024

Ten of the last 11 general elections have taken place in spring or early summer, and six of these were held jointly with local elections, which reduces the costs of holding separate elections. In 2024, local and mayoral elections will take place in many parts of the country on 2 May, making this a likely date for a spring general election.

An early May election would avoid the risk of poor local election results damaging the government’s poll ratings on a national level. A heavy defeat in the local elections could increase pressure on the prime minister – including from within his party – and make it difficult to regain momentum ahead of an election that would by then be less than a year away.

But Sunak would have been prime minister for just 18 months in May, and may want more time to deliver on his key pledges before going to the polls.

A May election would give the winning party an opportunity to conduct a full, multi-year spending review before the start of the 2025/26 financial year. Spending reviews typically set budgets for government departments across several years – the last one was conducted under Boris Johnson in 2021, which set budgets to April 2025. They ensure every department and all arms of government have the cash available to deliver priorities, such as improving public services or investing in infrastructure. A spending review would be an important opportunity for the government to set out its key priorities after an election, and how it will use public spending to deliver them.

A late election: January 2025

The latest a general election can take place is 28 January. Sunak is unlikely to break the convention for general elections to be held on a Thursday, which dates back to 1931, making Thursday 23 January the most likely latest election date.

The principal benefit of a late election is, simply, time. A January 2025 election would give the government the maximum amount of time to deliver on its priorities and prepare a campaign, and leaves the longest possible gap between the recent period of very high inflation and polling day. There would be more time to cut NHS waiting lists, particularly if industrial action by doctors can be resolved. Small boat crossings, another of Sunak’s five priorities, tend to be lower over winter – even if that is due more to weather than government policy.

But a January election would require the campaigning period to run over Christmas – something that has not happened in the UK since 1910 and is likely to be unpopular with the public. Poorer weather and shorter daylight hours may also affect both campaigning and turnout. How these factors might impact the result is unclear, but a January poll would certainly make the organisation of the election, from manifesto launches and hustings to postal voting, more difficult.

A January election would also leave no time for a full spending review before April 2025. A new prime minister would have little choice but to roll over existing settlements with only minor changes. Local authority budgets are set separately, in December, so will need to be finalised beforehand too.

An autumn 2024 election

An autumn election would allow the prime minister more time to improve his prospects of success, but without risking the disruption of a campaign over the Christmas period. He also has some choice over when exactly to call an election in the autumn.

A key question would be whether to hold the annual party conferences. Conferences generate revenue for political parties and are an opportunity to launch policy positions. They may however be seen as taking energy away from preparations for the election – not least given most ministers would be expected to attend conference, taking time away from campaigning in the hardest fought local areas.

There are two main scenarios for an autumn election:

1. Sunak could call an election on return from summer recess in early September, which would result in polling day in October. For example, an election called on the first day after summer recess, 2 September, with parliament dissolved on 5 September, would result in the earliest likely autumn election date of 10 October. The government would have to decide whether to cancel party conferences, usually held during this period, and absorb the loss of revenue, or use its event to launch policy in the weeks before an election. However, doing so could harm the election campaigns by drawing party members and resources away from campaigning across the country.
2. Sunak could instead call the election during, or shortly after, the party conferences. Parliament typically returns from conference recess in the second week of October, and an election called that week would result in a polling day of 21 November. The latest likely election date before Christmas is 12 December. This would however mean dissolving parliament on 6 November, the day after the US election.

An autumn 2024 election would present whoever wins with similar potential spending challenges to the later election, with no time for a full spending review or to set departmental budgets for 2025 – though it would provide some time to change departmental budgets in key areas and potentially to finalise local authority budgets in December.