1 October 2020
Payment of corporation tax for periods ended 31 December 2019 for small and medium-sized companies not liable to pay in instalments.
5 October 2020
HMRC must be advised of income tax or capital gains tax liabilities for 2019-20 if a tax return or notice to file has not been received.
7 October 2020
VAT return and payment for 31 August 2020 quarter (online).
14 October 2020
Quarterly corporation tax instalment for large companies depending on accounting year end.
Monthly EC sales list (paper return).
19 October 2020
Pay PAYE/CIS/student loan liabilities for month ended 5 October 2020 (cheque).
File monthly CIS return.
PAYE settlement agreement tax/class 1B NIC liabilities (cheque).
Payment of PAYE liability for quarter ended 5 October 2020 if average monthly liability is less than £1,500.
21 October 2020
File online monthly EC sales list.
Submit supplementary intrastat declarations for September 2020.
22 October 2020
PAYE/CIS/student loan payments (online).
Electronic payment of PAYE for quarter ended 5 October 2020 if average monthly liability is less than £1,500.
Electronic payment of PAYE settlement agreement liabilities.
31 October 2020
Submission of 2019-20 paper self-assessment tax returns.
Right to make a return requests for 2016-17 (ITEPA 2003, s 711).
Companies House should have received accounts of private companies with a 31 January 2020 year end and public limited companies with a 30 April 2020 year end.