The IFS report said: “If the Chancellor’s plans remain unchanged, next month will mark the beginning of a steep ascent in the path of UK taxation.

“It will come hand in hand with a spike in inflation, only fuelled further by the conflict in Ukraine. Not for nothing did TS Eliot call April the cruellest month.”

The research found that by 2024-25, the Government’s policies will have added two per cent of GDP to the country’s tax burden.

It noted: “The coming years could yet see the announcement of tax reductions (or cancellations of planned increases) that would make the current administration seem less high-taxing – although it is extremely hard to imagine that plans could change by so much that taxes would be cut overall.”

Both Labour and Conservative MPs have called on the Chancellor to introduce further measures to tackle the cost-of-living crisis, to which the tax rises will contribute.

Mr Sunak has so far committed to a £200 rebate on energy bills, money off council tax for some homes and expanding its scheme for low income households to get a discount on their electricity bills.

He has been urged to go further, such as cutting fuel duty to help those struggling to pay for their car’s running costs.

On Thursday, Gordon Brown and 70 local government leaders wrote to the chancellor telling him he must ditch his 1.25 percentage-point increase to National Insurance. They also called for support for households to buy green products such as insulation to bring down energy costs.