A P11D is a tax form used in the United Kingdom to report benefits and expenses provided to employees by their employers. This form is essential for calculating the taxable value of these benefits, which can include items like company cars, health insurance, and other perks. Employers must submit P11D forms to HM Revenue and Customs (HMRC) for each employee who receives such benefits. Employees receive a copy of their P11D, which helps them understand their taxable income. The information on the form is used to ensure that the correct amount of tax is paid, as benefits can affect an individual's overall tax liability.