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Key Dates and Deadlines

Payment Dates
Income Tax and National Insurance Contributions
31 July 2018 2017/18 second payment on account
31 January 2019 2017/18 balancing payment, and
2018/19 first payment on account
31 July 2019 2018/19 second payment on account
31 January 2020 2018/19 balancing payment, and
2019/20 first payment on account
Class 1A NICs
19 July 2018 2017/18 payment due
Capital Gains Tax
31 January 2019 2017/18 Capital Gains Tax
31 January 2020 2018/19 Capital Gains Tax
Corporation Tax
9 months and one day after the end of the accounting period (or by quarterly instalments if large company)
Inheritance Tax
6 months after the end of the month of death.
For chargeable lifetime transfers, due date is six months after the end of the month in which the transfer was made.
Latest Filing/Issuing Deadlines - 2017/18 PAYE Returns
31 May 2018 Issue P60s to employees.
6 July 2018 P11D and P11Db - also issue copies to employees
Deadline for employment related securities returns
2018 Self Assessment Tax Return (SATR)
31 October 2018 Last filing date - SATR Paper Version
30 December 2018 SATR Online if outstanding tax (subject to cap) to be included in 2019/20 PAYE code
31 January 2019 Last filing date - SATR Online