Self-assessment deadline (online)
Deadline for online submission of self-assessment tax return for 2017/18 tax year.
Self-assessment deadline (balancing payments)
Deadline for online submission of self-assessment balancing payments for 2017/18 tax year.
Self-assessment deadline (payment on account)
Deadline for first self-assessment payment on account for tax year ended 5 April 2018.
Corporation tax payment
Corporation tax payment due for year end 30 April 2018, for those companies not liable to pay their liability by instalments.
CT61 payment
Due date for income tax for the CT61 quarter to 31 December 2018.