19 January 2019

• Quarterly postal PAYE/class 1 NICs payment

  Q3 (2018/19) PAYE/NIC payment due where paid by cheque. The cheque must be with HMRC by this date in order to avoid automatic interest charge.

• 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 December 2018.

• CIS return

  Construction Industry Scheme: monthly return due for period up to 5th of previous tax month.

21 January 2019

• EC sales list

  Deadline for online monthly or quarterly return filing.

• Intrastat

  Due date for payment of supplementary declarations for December 2018.

22 January 2019

• 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.

• Quarterly electronic PAYE/class 1 NICs payment

  Q3 (2018/19) PAYE/NIC payment due in order to avoid an automatic interest charge.

31 January 2019

• Corporation tax return

  Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 January 2018 to be submitted to HMRC.

• Self-assessment deadline (payment on account)

  Deadline for first self-assessment payment on account for tax year ended 5 April 2018.

• Self-assessment deadline (balancing payments)

  Deadline for online submission of self-assessment balancing payments for 2017/18 tax year.