Economists have warned it is likely more financial support will be needed for households to get through the winter, despite the Chancellor’s multibillion-pound package last month.
It comes after Mr Sunak unveiled £21 billion of financial measures last month, aimed at supporting households facing 40-year high inflation levels and particularly a surge in energy bills.
Mr Millard, deputy director of the National Institute of Economic and Social Research (NIESR), told the committee he believes more will be needed after energy costs increase again later this year.
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He said: “The key thing is what will happen to heating bills in October, and as soon as that is announced we will have a much clearer idea.
“My gut feeling is that the package announced will not be enough and it will have to revisited in the autumn budget.
“With energy prices and food prices rising, for the country as a whole we will take a real income hit.
“The main issue is where that hit falls on the poorest members of the society, who spend more of their incomes on heating and food – it will be important to come back again and support those households in the Autumn budget.”
Ms McDonald, head of economics at the Joseph Rowntree Foundation, agreed with his sentiment.
“The commitment he made for uprating benefits next April by inflation this September means benefits will likely rise by 9%-ish depending on what inflation will be,” she said.
“That will do a lot for the next year to maintain spending power but I do think it’s likely that more will be needed.
“In terms of the Chancellor assessing the situation, I think that was framed in terms of assessing how inflation moves and although that is the main consideration, it’s not just that, but also the level of financial difficulty that families are in.”
However, Gemma Tetlow, chief economist at the Institute for Government, said she believes the Chancellor planned for his support to get households through the winter and therefore does not expect a further intervention until next year.
“I think is expectation is that this is enough to see households through to April and the following price rise,” she said.
“This could turn out to be wrong but I would perhaps expect a reassessment at a later date.”
Ms Tetlow predicted that the Chancellor could have to act again in February, when the Government has a clear idea what might happen to the price cap in April.
Members of the committee also questioned the potential inflationary impact of handing more financing support to families, as this could drive further spending.
Mr Millard told the MPs he does not believe it will result in higher inflation.
He said: “There is certainly tension with prices in theory but to be honest I’m not that worried about that – I do not think it will be inflationary.
“Why not? This is money to help the poorest people in society to buy stuff, food, to pay for their energy, precisely because they were not able to and would go other sources, such as borrowing or food banks.
“This is just enabling them to pay for something they would have bought anyway.
“In terms of creating excess demand, it’s not a big deal.”