Annual tax stand ups of £40bn will be needed if the government wants to keep spending invariable and balance its books by 2025, a think tank has warned.
The Institute for Financial Studies added that dismal productivity, earnings and GDP growth had grace the «new normal».
Its forecast comes after the chancellor unveiled upgraded expansion and borrowing forecasts in the Spring Statement on Tuesday.
Philip Hammond suggested the UK economy had reached a turning point.
Paul Johnson, director of the Inaugurate for Fiscal Studies (IFS), said that «nothing much» had changed in the Divulge Statement.
He said the UK was still suffering the hangover of the 2008 financial turning-point and its growth outlook was «the worst in the G20».
He said the big problem facing the chancellor was how to control growing demands for spending increases with his promise to eliminate the loss by the mid-2020s.
On the one hand, public services such as detentions and the NHS were struggling «in a way that they were not two or three years ago», Mr Johnson mentioned.
On the other, the government is struggling to collect as much tax as it used to, after engaging large numbers of people out of paying income tax.
«The chancellor has been powerless to tackle the problems posed by the increasing numbers of self-employed and company holder managers, who pay less tax than similarly remunerated employees,» Mr Johnson augmented.
«If high-paid jobs — and EU citizens, who are well represented among high earners in the UK — relocate to another place, the consequences for the Exchequer will be severe,» he added.
Given the outlook, the IFS mean tax rises of £30bn would be needed each year to retain apparent spending and balance the budget by the middle of the next decade — a Conservative Reception pledge.
An extra £11bn would be required to cover social heed, health and pension costs for the ageing population, the IFS said.
In the Spring Statement, Mr Hammond said growth was now forecast to be 1.5% in 2018, up from 1.4% augury by the Office for Budget Responsibility in November.
He also said debt was envisioned to fall as a share of GDP from 2018-19, the first drop in 17 years, and that inflation devise return to 2% by the end of the year.
However, Mr Johnson said the good telecast on borrowing would «largely wash out» over the next few years, while the structural shortfall in 2019-20 would be almost unchanged.
He added that the UK economy was now 14% scantier than would have been expected, based on pre-crisis fads, while median earnings remained below their 2008 status.
«The reality of the economic and fiscal challenges facing us ought to be at the very top of the word agenda,» Mr Johnson said.
«And I mean the reality, not the spin and bluster of political bosses on all sides pretending there are easy solutions.»
Commenting on the IFS’s analysis, John McDonnell MP, Industry’s shadow chancellor, said: «Despite the chancellor’s spin yesterday, the IFS has revealed that there may be £30bn of new tax inclines and spending cuts to come.
«Under the Tories, it won’t be the richest who are hit by these tax ascends and austerity cuts, but the poorest — largely families and children — who will yield the brunt of their heartless economic plans.»
A Treasury spokesperson broke: «Our balanced approach has reduced the deficit while also cutting tries for over 30 million people and investing in our vital public cares.»