The average household is now only 19 days away from poverty, research shows.
Household energy bills are due to rise to £3,549 a year from October as regulator Ofgem raises its price cap.
Brits are also facing steep rises in costs like groceries as part of a wider cost of living crisis.
The storm of rising costs means normal households are more at risk of falling into poverty.
The typical home had enough savings to pay for 21 days of bills back in 2020, according to financial firm Legal and General.
That has now fallen to 19 days.
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The average home has savings of £2,431 and debts of £610, L&G said. But the typical home has bills of £93 a day.
After debts, that means the average household has enough cash to last just 19 days.
But the picture is even worse for five million people in the UK who have less than £20,000 a year in income.
L&G Retail chief executive Bernie Hickman said: “Our latest research presents a challenging picture for working households across the UK.
“We often talk about managing money month-to-month but, as our findings indicate, for some it’s a case of day by day.
“It may feel overwhelming, but we encourage people to do what they can now so they are best prepared for a further squeeze on finances.”
Yesterday The Mirror reported that thousands of low income families will soon see household bills higher than their monthly pay.
Charity Crisis said families on the lowest incomes, earning about £12,650 a year, could easily see bills bigger than their monthly pay by January once grocery bills and rent are factored in.
The charity said that even homes with incomes of £22,615 will spend 73 per cent of their take-home pay on energy, rent and food costs, the i reports.
Hundreds of thousands of households face also homelessness this winter due to rising energy bills, Crisis said.
Crisis chief executive Matt Downie said: "The situation could not be more desperate. For the poorest households the combined cost of rent, food and energy will exceed their income by a third.
"People cannot simply be expected to cut back. You can’t cut back on the absolute basics required to survive. Families will be left completely destitute if help is not forthcoming.
"The Government has already waited too long to provide reassurance to anxious households. They must act now to prevent soaring rates of homelessness becoming the tragic legacy of the turbulent economic times we are in.”
Approximately 24 million households are covered by the energy price cap, including four million on prepayment meters.
The huge rise in the price cap will add more pressure on to families already struggling with the cost of living crisis - with campaigners fearing many will be pushed below the poverty line.
Ofgem has urged the the new Prime Minister to announce further financial support - with the price cap rise typically £750 more per year than help measures in May were based on.
