It comes as she is expected to scrap the two-child benefit cap, in a move that could cost more than £3 billion.
Rachel Reeves will extend a crackdown on benefit fraud in a bid to raise £1.2 billion as she seeks to balance the books in the Budget this week.
It comes as she is expected to scrap the two-child benefit cap, in a move that could cost more than £3 billion.
The Chancellor is also thought to be poised to raise taxes in an effort to bridge a multibillion-pound gap in her spending plans.
She will extending targeted case reviews, which root out inaccuracies in universal credit claims, with the aim of bringing in an extra £1.2 billion by March 2031.
She could also hit more than 100,000 high-value properties with a levy that applies to those worth more than £2 million and could raise £400-£450 million, The Times reported.
Some 2.4 million properties in the top three council tax bands would be revalued to determine which would be subject to the surcharge.
People will be able to defer the cost until they die or move house to avoid forcing them to sell up, according to the newspaper.
Ms Reeves is grappling with weak economic growth, persistent inflation and an expected downgrade to official productivity forecasts as she prepares her statement.
After scrapping plans to raise income tax, she is expected to look to a “smorgasbord” of smaller measures to bring in cash.
She is thought to be considering bringing in a pay-per-mile tax for electric vehicle drivers and limiting how much workers can stash in their pensions under salary sacrifice schemes before paying national insurance.
And she will reaffirm the Government’s commitment to the triple lock on state pensions, and confirm that 13 million pensioners are set to benefit from an above inflation rise next April.
An extension of the freeze on income tax thresholds is also among rumoured measures and would see more people dragged into paying tax for the first time or shifted into a higher rate as their wages go up.
The Lib Dems have said the move would be “rank hypocrisy” and amount to a “stealth tax stitch-up” by Labour and the Conservatives.
They say extending it for two years will drag another 1.3 million into starting to pay income tax or into the higher rate, on top of 7.7 million already estimated to be hit under the Conservative freeze due to end in 2028.
Lib Dem deputy leader Daisy Cooper said: “A staggering nine million people are now set to be hit by the Conservative–Labour stealth tax stitch-up.”
She added: “Families across the country are fed up with being milked for their hard-earned cash.”
Helen Miller, director of the influential think tank the Institute for Fiscal Studies, said freezing the income tax threshold would “break the letter” of Labour’s manifesto.
“Assuming that it’s done the same way that it’s been done so far, it will also be a freeze in national insurance thresholds.
“It will therefore also be an increase in national insurance, and if so, in my mind, it would also break the letter of the manifesto, which said no increase in national insurance,” she told The Westminster Hour on BBC Radio 4.
