HMRC has paused some ongoing investigations as a result of being stretched to capacity during the coronavirus pandemic.
The Revenue has temporarily stopped asking for information, documents and responses to queries during the lockdown.
Some probes have been suspended indefinitely as the tax authority prioritises providing support to businesses and individuals.
Over the last four weeks, HMRC has been tasked with setting up and operating COVID-19 furlough schemes in a bid to prop up the economy.
Jim Harra, chief executive at HMRC, said last week that every resource is being diverted to provide emergency payments as soon as possible.
A spokesperson at HMRC said:
"The Government has announced an unprecedented support package for business and workers to help them through this economic emergency.
"It is right that HMRC does everything possible to protect individuals, businesses and that the economy during this extremely difficult time. This includes prioritising work to support businesses and individuals.
"HMRC will always take tough action against fraudsters who attempt to deprive the UK of the public funds the Government needs to support the nation at this difficult time."
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