For employers operating PAYE, this is the deadline to send an Employer Payment Summary (EPS) to claim any reduction on what you'll owe HMRC
22nd
Deadline for employers operating PAYE to pay HMRC. For those paying by post, the deadline is 19 December.
30th
Deadline for submitting online Self-Assessment Tax Returns to HMRC - for those who are both self-employed and employed and want to spread their payments throughout the year via their PAYE tax code, rather than paying one lump sum