19 December 2018
Monthly postal PAYE/class 1 NICs/student loan payment
If you pay by cheque through the post, monthly payments due for PAYE, class 1 NICs and student loan deductions from November 2018.
Construction Industry Scheme: monthly return due for period up to 5th of previous month.
21 December 2018
Due date for payment of supplementary declarations for November 2018.
EC sales list
Deadline for online monthly or quarterly return filing.
22 December 2018
Monthly electronic PAYE/class 1 NICs/student loan payment
If paying electronically, pay PAYE, class 1 NICs, student loan deductions and deductions from payments to subcontractors for the month up to the 5th of this month.
30 December 2018
Online self-assessment (PAYE)
Deadline for online submission of self-assessment tax returns for tax year ended 5 April 2018 for HMRC to collect tax through PAYE codes, where they owe less than £3,000.
31 December 2018
End of CT61 quarterly period.
Company accounts filing deadline
Deadline for filing your company tax return is 12 months after your accounting period for corporation tax ends.
Corporation tax return
Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 December 2017 to be submitted to HMRC.
01 April 2019
Class 2 national insurance
This is now abolished.