In the video, Mr Healey sought to reassure both voters and financial markets, saying: "The world's a highly uncertain place. Conflicts abroad are pushing up energy prices, and the cost of living here at home, piling pressure on the families, on businesses, and on our public finances."
He said the Budget would give households "breathing space from some of the everyday costs", provide targeted support for businesses and self-employed people, and begin long-term action to bring energy costs down.
The City is concerned, however, about a planned raid on bank profits intended to fill a black hole in public spending and create headroom ahead of possible shocks in 2027. There are threats that banks could move headquarters out of London to European rivals including Hamburg and Paris.
Mr Healey is understood to want help for the poorest households with energy bills, as well as another freeze on fuel duty. He is also under pressure to fund public sector pay rises, with unions threatening strike action next year, and he acknowledged that the wars in the Middle East and Ukraine are driving up inflation and mortgage rates.
Despite claims that Labour has become "anti-business", the chancellor said he would back British businesses and entrepreneurs, while confirming a 4 per cent rise in the minimum wage. He promised to invest in technology, build more homes and shift power out of Whitehall.
In an interview with ITV, defence secretary Wes Streeting confirmed that his department will receive extra funding in the Budget as Labour aims to spend 3 per cent of GDP on defence and security by 2030, after repeated pressure from US President Donald Trump.
Mr Healey insisted the government would stick to tight fiscal rules: "We'll do all of this responsibly, sticking within tight fiscal rules, and make sure every pound is well invested."
The Chancellor became Labour's Treasury chief after resigning as defence secretary under Sir Keir Starmer, a move that helped trigger Andy Burnham's rise to prime minister, because the previous government failed to find the military funding needed.