THE rising cost of living will become the dominant issue facing Boris Johnson, the head of an economic think tank has warned as families faced a £1200 hit from April.

The Resolution Foundation (RF) said families would typically face that level of impact as the energy price cap is raised and a 1.25 percentage point increase in National Insurance contributions (NICs) comes into effect.

At the same time, rising inflation means that real pay levels are set to stagnate, with real wages next Christmas forecast to be no higher than they are this year.

The Bank of England expects the inflation rate to hit about 6% by spring 2022, meaning the benefits of any wage increases are likely to be eroded by rising prices.

Resolution Foundation chief executive Torsten Bell told BBC Radio 4’s Today: “If you think about the politics of this, energy prices and taxes are always big politics in Britain.

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“The fact that two such big changes are coming on top of each other in April, at the same time as our wages aren’t rising that significantly because of higher inflation in general, I think means that this is going to be the dominant story once we come out of the bad but hopefully short-lived Omicron wave.”

He said the “squeeze” on living standards is likely to be so severe that Chancellor Rishi Sunak will come under intense pressure to act to alleviate the economic pain.

The latest warning comes amid fears among Tory MPs that a new year “cost-of-living crisis” will further undermine voter support for the Government that is already badly dented by reports of Downing Street parties in breach of Covid rules.

The RF said the peak of the “squeeze” looked set to be in April, when the cap on energy bills is expected to rise by around £500 a year while the cost of energy firm failures would add another £100 to consumer bills.

The price rise will disproportionately affect low-income families who spend more of their income on energy. It is expected to account for 12% of the income of the poorest households compared with 8.5% now.

Meanwhile in Europe, EU officials say 20 member countries have already taken action to reduce the financial strain of increased energy costs on households.

Countries like Italy and Portugal have cut energy taxes and lowed the sales tax on household energy, while Norway will help to pay a third of citizens’ electricity bills to help ease pressure.

The UK Government has so far resisted calls from the SNP to bring in similar measures.

At the same time, the RF said the UK's freeze to income-tax thresholds and the 1.25% increase in personal NICs would cost the average household £600 a year.

For families in the top half of the income distribution, the NIC rise alone would lift tax bills by an average of £750.

Meanwhile, the RF said real wages, which were flat in October, had “almost certainly” started to fall and would not pick up again until the final three months of 2022, leaving real pay just 0.1% higher than it was at the start of the year.

By the end of 2024, real wages would still be £740 a year lower than if the UK’s “already sluggish” pre-pandemic pay growth continued.

Bell said 2022 looked set to be defined as the “year of the squeeze”.

He said: “The peak of the squeeze will be in April, as families face a £1,200 income hit from soaring energy bills and tax rises.

“So large is this overnight cost-of-living catastrophe that it’s hard to see how the Government avoids stepping in.”

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Commenting, the SNP’s Shadow Chancellor Alison Thewliss MP said: “Under Conservative rule, the UK is facing a cost-of-living catastrophe.

“This latest report from the Resolution Foundation has concluded what we feared the most - millions of families across the country are set to face massive losses in income due to cruel Conservative decisions.

“When we combine the increase to National Insurance, energy prices soaring, and wages stagnating, the reality is deeply concerning. 

“The Chancellor must finally heed the warnings and urgently bring forward meaningful financial support to tackle the Tory cost-of-living crisis, reverse rising poverty, and mitigate Brexit.

“However, for as long as Scotland is under Westminster control, we will continue to be vulnerable. 

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“The only way to protect Scotland’s interests and household incomes is to become an independent country.”

A UK Government spokesman said ministers had put in place £4.2 billion worth of “decisive action” to help support families with the cost of living.

This includes reducing the Universal Credit taper and a range of measures to help with bills, including the energy price cap and cold weather payments, as well as freezing alcohol and fuel duty.

Shadow work and pensions secretary Jonathan Ashworth said the Prime Minister was “nowhere to be seen” on the issue.

“He could take VAT off the energy bills – that would cushion this for many, many families,” Ashworth told Sky News.

“In fact, you’re going to have families worse off, you’re going to have pensioners who are now facing the prospect of shivering in the cold or going without hot meals because of these rising (bills).”