Her Majesty's Revenue and Customs (HM Revenue and Customs or HMRC) is responsible for the collection of taxes and the payment of some forms of state support.
Have your National Insurance number with you when you phone.
Phone lines are less busy before 10am, Monday to Friday and on Sunday.
New advice for HMRC scams
Here is a helpful overview of what to do if you receive a phone call, email or text from HMRC, but you are not sure it is genuine
HMRC warns of landline scams
We warn those with landline phones to be cautious due to criminals using phones to contact victims following a rising focus on SMS and email phishing.
Marriage Allowance promoted on Valentine's Day
HMRC is encouraging married couples and people living in a civil partnership to sign up to the tax free break, which is worth up to £238 this year.
HMRC prevents one million visits to scam websites
HM Revenue & Customs (HMRC) has averted over a million visits to deceptive websites, including those which promote misleading and costly helpline numbers, it announced today.