| 1 | New Advisory Fuel Rates (AFR) for company car users apply from today. |
| 19 | PAYE, Student loan and CIS deductions are due for the month to 5 December 2017. |
| 30 | Online filing deadline for submitting 2016/17 self assessment return if you require HMRC to collect any underpaid tax by making an adjustment to your 2018/19 tax code. |
| 31 | End of CT61 quarterly period. Filing date for Company Tax Return Form CT600 for period ended 31 December 2016. |
