May 31st, 2022. The deadline for submitting a P60 is the end of May following the tax year for which it applies. So, for the tax year 2020/2021, the P60 deadline would be May 31st, 2022. This deadline applies to all employees in the UK, regardless of how long they have been with their current employer or what type of contract they have. It's important to note that the P60 is different from the P45, which is given to employees when they leave their job. The P60 summarises an employee's total pay and tax deductions for the year and is used to verify that the correct amount of tax has been paid.