Under the PAYE system what are an employer's duties at the end of the tax year?

Employers must give all employees in employment on 5 April (the end of the tax year), a form P60, showing among other detail "total for year" figures of pay and tax deducted. This must be done by 31 May. Employers must submit their final full payment submission to HM Revenue and Customs on or before their last payday of the tax year, indicating that it is the final submission for the year.