Rishi Sunak has given the clearest hint yet about when he will call a general election, saying his “working assumption” is that it will happen in the second half of this year.

Speculation has been rife for months about when the prime minister will choose to go to the polls.

Politics latest: One date thought to be frontrunner for election this year

Technically, he can wait until December before calling an election, meaning voters would then cast their ballots in January 2025.

But Mr Sunak has narrowed down the timeframe for an election the polls suggest the Tories will lose, which would bring to an end 14 years in power under five prime ministers.

Speaking to broadcasters on a visit to a youth centre in Mansfield, Nottinghamshire, he said: “So, my working assumption is we’ll have a general election in the second half of this year and in the meantime I’ve got lots that I want to get on with.”

The Conservative leader declined to rule out a May election categorically – but repeated his intentions to call one later in the year.

“I want to keep going, managing the economy well and cutting people’s taxes,” Mr Sunak said.

“But I also want to keep tackling illegal migration. So I’ve got lots to get on with and I’m determined to keep delivering for the British people.”

Both the Conservatives’ and Labour’s long election campaigns were well under way on Thursday, as both party leaders visited battleground areas.

Labour has claimed a spring vote is the “worst kept secret in parliament”, with party leader Sir Keir Starmer earlier saying in his own speech to voters in Bristol that he is “ready” for a general election whenever it is called.

Responding to Mr Sunak’s remarks which hinted at an autumn vote, Sir Keir accused the prime minister of “delaying” the inevitable.

He told Sky’s political editor Beth Rigby: “People are crying out for change. And I say to the prime minister, what’s he hiding? If he’s not going to set a date, what’s he hiding from the public?

“This has serious implications for the country because he’s basically saying he’s going to be squatting for months and months in Downing Street, dithering and delaying.

“So if he’s not being clear, and I don’t think he’s setting a date, what’s he hiding?”

Asked whether he would prefer a vote in the first half of the year, Sir Keir said: “I would like to see an election as soon as possible.

“I think the vast majority of the public want to see an election as soon as possible, and the reason is that the choice now is to turn our back on 14 years of decline and usher in a decade of national renewal with hope and change.”

He added: “People can’t afford for the prime minister to be squatting for months on end this year.”

The Liberal Democrats have also been calling for Mr Sunak to hold the vote in May rather than trying to “cling on” to power for the rest of the year.

Lib Dem leader Ed Davey accused Mr Sunak of “running scared” of a May election.

He said: “Squatter Sunak is holed up in Downing Street, desperately clinging on to power rather than facing the verdict of the British people.

“We need an election in spring, so that voters can finally get rid of this appalling and out-of-touch Conservative government.”

Analysis: PM will be hoping ‘squatting’ charge over election timing won’t stick

Amanda Akass

Political correspondent

@amandaakass

The prime minister has thoroughly stolen the thunder and headlines from Sir Keir Starmer’s new year speech with the revelation that his “working assumption” is that a general election will be held in the second half of the year.

Speculation in Westminster had been growing that the Tories were preparing to go to the polls in May – particularly after confirming over Christmas the spring budget would be delivered in March.

Many believed the strategy was for the chancellor to offer a generous series of tax cuts as a sweetening springboard into an early trip to the ballot box.

Pundits pointed out that this would avoid the embarrassing fallout from another drubbing at the local elections and a summer of small boat arrivals – and activists, it’s thought, would be more enthusiastic about pounding the pavements and knocking on doors in milder weather, particularly if they were doing so anyway on behalf of local council candidates.

But with Labour riding so consistently high in the polls and only one of his five pledges met (halving inflation), Rishi Sunak is clearly unconvinced by these arguments.

With the path to a Tory victory at any time of year so incredibly narrow, others believe the PM just wants to maximise his time in office. Indeed, speaking to reporters today he argues he’s still got plenty more to do in terms of “managing the economy well and cutting people’s taxes” as well as “tackling illegal migration”.

Delivering on illegal migration means successfully forcing his emergency Rwanda legislation through both houses of parliament, and past future legal challenges.

It’s the key challenge for Mr Sunak and his team at present; many advisors believe finally getting deportation flights off the ground, combined with a dramatic economic recovery, is perhaps his only real hope of clinging on to power at the next election.

Needless to say the opposition parties aren’t happy.

The Liberal Democrats yesterday called for a return to the Fixed Term Parliaments Act, to take away the PM’s power to call elections as the most opportune political moment. They’ve accused Mr Sunak of “bottling” the opportunity to call an election – with echoes of Gordon Brown’s perceived dithering in the autumn of 2007.

Both Sir Ed Davey and Sir Keir say Mr Sunak is “squatting” in Downing Street – with Sir Keir arguing that both he and the country want to see an election as soon as possible.

The PM will be hoping he’s set out his timetable early enough to avoid that charge sticking; but don’t expect the calls for an immediate national vote to calm down any time soon.

Reform UK has ruled out entering into any electoral pacts with the Tories.

Mr Sunak warned against voting for Reform UK amid fears the right-wing party could steal votes from the Conservatives.

He said: “A vote for anybody who’s not a Conservative candidate, a Conservative MP, is a vote for Keir Starmer in power.

“There’s only going to be two options for prime minister after the next election, it’s either going to be me or Keir Starmer. A vote for anyone who is not a Conservative is a vote for Keir Starmer in power.”

He added: “What’s the issue that has motivated a lot of these conversations? It’s illegal migration. So, what’s my track record? Well, I’m the first person to actually cut the numbers, and cut them not just by a little, but cut them by over a third in my first year in power.

“We’re going to pass our Rwanda Bill through parliament, get that scheme up and running, and that will provide the further deterrent we need to grip this once and for all.”