A P60 form is a statement or certificate showing how much you have earned, and the amount of tax you have paid in a tax year. You get a separate P60 for each of your jobs every tax year.
If you are working for an employer on 5 April they must give you a P60. They must give you this by 31 May, on paper or electronically.
One misconception for employees is that all tax deducted and paid to HMRC is done for you by your employer and that you don’t have to worry.
It's good to remember that while the payroll department process the weekly or monthly figures for you it is however your responsibility to check your payslips & your P60 so you can either claim back any overpaid tax or report underpaid tax.