HMRC Failure 'Costs Whitehall £20bn In Tax'
The Government could recoup another £20bn a year if it improved the efficiency of its tax collection, according to councils.
The Local Government Association (LGA) claims uncollected tax is costing the equivalent of £1,370 for every household in England and Wales.
It said HM Revenue and Customs was not matching tax collection rates achieved by councils and called for a commitment to at least halve the shortfall by the end of this Parliament.
HMRC accused the LGA of misunderstanding the "tax gap" and insisted it collected 99% of all taxes and duties owed.
But Sharon Taylor, chairwoman of the LGA's finance panel and Labour Leader of Stevenage†Council, said: "If central government's collection rates were as good as those of councils, the public purse would be more than £20bn better off.
"That's almost double the size of the total spending cuts announced in the Chancellor's spending round.
"When the taxman's balance sheet falls short, it takes a toll on public services across the board.
"Local government is the most efficient part of the public sector. Council tax has one of the highest collection rates of any tax.
"We cannot afford for local services like road maintenance, libraries and social care to continue paying the price of those who evade and avoid their tax liability. We all need government to do better in tackling this.
"Local authorities collect council tax from more than 22 million homes. If councils can obtain more than 97% of this, it is reasonable that Whitehall should be able to match this.
"Government has made positive noises on tackling unpaid tax. We now want to see a clear timetable which sets out how government will significantly improve their tax collection record."
An HMRC spokesman said: "The LGA have fundamentally misunderstood the nature of the tax gap which is not a measure of tax unpaid.
"In fact HMRC already collects 99% of all taxes and duties which are collectible from a very wide customer base of 60 million taxpayers, increasing our tax take by £1.4bn to £475.6bn in the last year alone - on average we collect £1.3bn a day for the UK."