First payment on account
Midnight deadline to pay half of any tax owed for 2020/21.
Online self-assessment (PAYE)
Deadline for online submission of self-assessment tax returns for tax year ended 5 April 2020 for HMRC to collect tax through PAYE codes, where they owe less than £3,000.
Paper deadline for self-assessment
Deadline for paper submission of self-assessment tax return for tax year ended 5 April 2020.
Income tax and capital gains
Taxpayers who do not receive a self-assessment tax return to complete must notify HMRC by 5 October if they had income or capital gains in the previous tax year on which further tax is due.
Deadline for self-assessment (payment on account)
Deadline for second payment on account for tax year ended 5 April 2020.