End of CT61 quarterly period.
Filing deadline for corporation tax return self-assessment form CT600 for period ended 31 December 2018 to be submitted to HMRC.
Deadline for filing your company tax return is 12 months after your accounting period for corporation tax ends.
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.
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.