HMRC is one of the largest UK government departments. The department is responsible for the administration and collection of direct taxes including Income Tax, Corporation Tax, Capital Gains Tax (CGT) and Inheritance Tax (IHT), indirect taxes including Value Added Tax (VAT), excise duties and Stamp Duty Land Tax (SDLT), and environmental taxes such as Air Passenger Duty and the Climate Change Levy. Other aspects of the department's responsibilities include National Insurance Contributions (NIC), the distribution of Child Benefit and some other forms of state support including the Child Trust Fund, enforcement of the National Minimum Wage, administering anti-money laundering registrations for Money Service Businesses and collection and publication of the trade-in-goods statistics. Responsibility for the protection of the UK's borders passed to the UK Border Agency within the Home Office on 1 April 2008 and then to UK Border Force and the National Crime Agency in 2013; however, HMRC officers are also regularly deployed at the border to assist on operations.
HMRC is also a law enforcement agency, responsible for investigating and tackling tax fraud, excise (tobacco & alcohol) fraud, smuggling, money laundering and a number of other types of offences against the Treasury. The criminal investigation department is at the head of its Customer Compliance Group, known as Fraud Investigation Service (FIS).
HMRC has a strong cadre of criminal investigators responsible for investigating Serious Organised Fiscal Crime. This includes all of the previous Customs criminal work (other than drug trafficking, but used to include this up until 2008) such as tobacco, alcohol, and oil smuggling. They have aligned their previous Customs and Excise powers to tackle previous Inland Revenue criminal offences. Fraud Investigation Service are responsible for seizing (or preventing the loss of) billions of stolen pounds of HMG's revenue. Their skills and resources include the full range of intrusive and covert surveillance and they are a senior partner in the Organised Crime Partnership Board.
HMRC's criminal investigation department is Fraud Investigation Service (FIS). Officers deployed in their criminal investigation teams have the same powers as police officers, and have wide-ranging powers of arrest, entry, search and detention. HMRC have the power to apply for orders requiring information to be produced; apply for and execute search warrants; make arrests; search suspects and premises following arrest; and recover criminal assets through the Proceeds of Crime Act 2002. They also have extensive surveillance powers that authorised criminal investigation officers are trained to utilise.
The main power, exercised under section 138 of the Customs and Excise Management Act 1979 (as amended by section 114 of the Police and Criminal Evidence Act 1984), is to arrest anyone who has committed, or whom the officer has reasonable grounds to suspect has committed, any offence under the Customs and Excise Acts as well as related fraud offences.
On 30 June 2006, under the authority of the new Labour home secretary, John Reid, extensive new powers were given to HMRC. Under chairman Sir David Varney, a new Criminal Taxes Unit of senior tax investigators was created to target suspected fraudsters and criminal gangs. To disrupt and clamp down on criminal activity. This HMRC/CTU would pursue suspects in the same way the US Internal Revenue Service caught out Al Capone on tax evasion. These new powers included the ability to impose penalties without needing to prove the guilt of suspected criminals; extra powers to use sophisticated surveillance techniques, and for the first time, to have the same ability as customs officers to monitor suspects and arrest them. On 19 July 2006, the executive chairman of HMRC, Sir David Varney resigned.
HMRC is also listed under parts of the British government which contribute to intelligence collection, analysis and assessment. Their prosecution cases may be co-ordinated with the police or the Crown Prosecution Service.