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
All weekend it felt as though the new administration had a self-destruct button and was desperately searching for it.
Areas of dense freezing fog across the south-east could cause flight delays until at least 10.30am, according to forecasts.
Survey shows support for compulsory sex and relationship education classes as students struggle to deal with online sexual harassment.