Sir Keir Starmer has warned that October's Budget will be “painful” and the government will have to make “big demands” on the public.
Speaking from Downing Street Gardens, the Prime Minister said people “have to accept short-term pain for the long-term good”.
He did not say what would be in the budget but said that those with broad shoulders should bear more burden.
The prime minister said he had inherited “not just an economic black hole but a social black hole” from the previous Conservative government.
Conservative leadership candidate Cammy Badenoch, who serves as shadow housing secretary, said: “Keir Starmer is fooling the British people.”
He added: “His dishonest analysis won't wash. He campaigned on promises he couldn't keep and now he's being found out.”
Since coming to power in July, Labor has sought to emphasize the challenges it faces in government and has blamed Tory ministers for failing to address these issues ahead of the election.
In his speech, Sir Kerr claimed things were “unthinkable” and accused the Conservatives of A £22bn black hole In the public finances – something the Tories vehemently deny.
He also said the previous government “failed to be honest”, adding: “They offered the snake oil of populism which led to further failure – round and round and round.”
He argued that those who took part in the recent riots “saw cracks in our society after 14 years of failure and exploited them”.
Looking to the future, Sir Kerr said “drastic action” would be needed to “fix the foundations of the country”.
He reiterated his campaign promise that the government would not increase National Insurance, Income Tax or VAT.
His chancellor, Rachel Reeves, has made similar promises but said: thinks Some taxes will rise and reforms to inheritance tax, capital gains tax, or tax relief on pensions have not been ruled out.
The government has already announced some cost-cutting measures, including removing a planned cap on social care payments. take back Winter fuel allowance to 10 million pensioners.
A Labor backbencher told the BBC his inbox was flooded with people particularly upset by the decision to end universal fuel payments for pensioners in the winter – but after hearing Keir Starmer “people will understand” what is the thought behind it.
Some conservatives have criticized the government's decision. Award Pay rises for public sector workers while limiting access to winter fuel allowances.
Defending the decision, Sir Kerr said it was “in the country's fortune to simply allow national strikes to continue and not resolve them”.
After the speech Sir Kerr was asked about allegations of Conservative “cronyism”.
The opposition has attacked the government. Passing number 10 A Labor donor Lord Ali and Appointment Another donor, Ian Corfield, for a temporary job at the Treasury.
In response, Sir Kerr said he wanted to “act at a faster pace” and needed “the right people in the right places”.
He said he was determined to “restore honesty and integrity” in government, adding that he would “not take a lecture” from the Conservatives on the issue.
In an opinion piece for The Times Published ahead of the speech, the PM wrote about how the setting for his upcoming speech, the Downing Street rose garden, was “rotten at the heart of his government” for members of the public under the previous Conservative leadership. can become a symbol of .
Sir Kerr referred to a press conference given by Dominic Cummings, a former aide to Boris Johnson, where he Defended his decision to break the Covid lockdown rules..
He also wrote about pictures taken of Mr Johnson and his staff near the Rose Garden with bottles of wine and a cheeseboard amid strict restrictions on social mingling during the Covid pandemic. Boris Johnson said at the time that the images showed “people at work”.
The prime minister's speech on Tuesday was in front of about 50 members of the public he met on the campaign trail, including small business owners and civil servants.
Reacting to the details of the Prime Minister's speech, Conservative Party Chairman Richard Fuller said: “This is nothing more than a performance speech to distract the public from Starmer's promises which he has no intention of ever delivering. was.”
“In less than 100 days, the Labor Party has scuttled its ambitions for public service and fallen into disarray, handing out bumper payouts to its union paymasters with 'no strings attached' and The foundation has been laid to harm pensioners and tax working people.” The Chairman of the Conservative Party added.
SNP deputy leader Keith Brown said: “The Keir stormers simply cannot erase the fact that, during long years of Tory rule, Labor refused to stand with them on some of the most damaging policies.
“Labour has signed up to an austerity agenda, backed attacks on the welfare state, and is refusing to reverse Brexit.”
“Tolerating more economic pain and hardship is not what people voted for,” Green Party co-leader Carla Denier said.
“Labor's refusal to tax the super-rich shows that business as usual is very much on.”