HM Revenue & Customs
HM Revenue & Customs (HMRC) is the new department responsible for the business of the former Inland Revenue and HM Customs and Excise.
http://www.hmrc.gov.uk/

Self Assessment
As a single department, HMRC will have the added benefit of producing greater efficiencies, reducing the tax gap and providing a greater customer focus.
http://www.hmrc.gov.uk/sa/

Tax Credits Online
9 out of 10 families with children are entitled to tax credits.
https://www.taxcredits.inlandrevenue.gov.uk/HomeIR.aspx

Valuation Office
The Valuation Office Agency (VOA) is an executive agency of HM Revenue & Customs (HMRC) with 85 offices spread throughout England, Wales and Scotland employing around 5000 people.
http://www.voa.gov.uk/