An influential group of MPs said giving the taxman the power to recover money directly from personal bank accounts without some form of prior independent oversight would be "wholly unacceptable".
The Commons Treasury Committee also dismissed George Osborne's argument that the Department for Work and Pensions (DWP) already had similar powers to collect child maintenance.
The parallel is not exact: in those cases, DWP is acting as an intermediary between two individuals.
HMRC [HM Revenue and Customs] would be acting not as an intermediary between two individuals but rather in pursuit of its own objective of bringing in revenue for the Exchequer.
More top news
Michael Clarke ended his one-day international career by leading Australia to a simple World Cup final win over New Zealand.
Hackers have accessed tens of thousands of British Airways frequent flier accounts.
Ferrari are back as Sebastian Vettel ended the famous marque's 34-race drought without a victory in Malaysia.