A senior economist has warned the cost of living is soaring for households on the lowest incomes, with the poorest experiencing double digit inflation.
Inflation hit 9.1% on Wednesday, a 40-year high and the highest in the G7.
Senior economist at the Resolution Foundation, Jack Lesie, said that rapidly rising food prices mean poorer households are being hit hardest.
He said: "Faster food price inflation meant that poorer households' inflation rates have accelerated faster than richer households.
"For the poorest tenth of families, inflation is well into double digits now."
Responding to the latest inflation figures, the chancellor said he knows "people are worried about the rising cost of living".
"We are using all the tools at our disposal to bring inflation down and combat rising prices – we can build a stronger economy through independent monetary policy, responsible fiscal policy which doesn't add to inflationary pressures, and by boosting our long-term productivity and growth," said Sunak.
However, his remarks come as the government urges the public not to seek inflation busting pay-rises, claiming they could make inflation increases worse.
Boris Johnson has said raising public sector wages inline with inflation would be "reckless".
"It involves chasing inflation with wages, so that you end up having a knock-on impact of pushing inflation ever higher and therefore means the pay people do take home is worth less," the prime minister's spokesperson said on Wednesday.
The cost of living squeeze is set to get tighter this winter following new predictions that the energy price cap will increase by around £1000 in the autumn.
Ofgem originally predicted the price-cap was set to hit £2,800 in October - however, new figures show it is set to rise to £2,980.
"Inflation is pushing family finances to the brink - but the low wage spiral many face isn’t new," said shadow chancellor Rachel Reeves.
"It’s a result of a decade of Tory mismanagement of our economy.
"Labour will build the high wage, high growth, stable inflation economy we deserve."
The chief executive of the progressive think tank the New Economics Foundation (NEF) has said the new figures deal another blow to the most vulnerable households.
"Today, inflation has continued to climb to a 40 year high of 9.1%," said Mia Fahnbulleh.
"When a third of people in the UK are already struggling to afford everyday essentials, these price rises will deliver yet another painful blow."
There are also warnings that the chancellor's £15bn cost of living support package announced last month could soon be out of date.
"New inflation data shows large increase in food prices, incl. as consequence of Russia’s war," said senior economist at IPPR, Carsten Jung.
"Fiscal support so far largely tried to compensate households for higher energy costs. This might soon have to broaden."
Watch: Chancellor insists govt are acting to combat rising inflation