5 – End of 2019/20 tax year. Last day to use up annual exemptions for capital gains tax, inheritance tax and ISA’s
6 – Start of the 2020/21 tax year
14 – Return and payment of CT61 tax due for quarter to 31 March 2020
19/22 – PAYE/NIC, student loan and CIS deductions due for month to 5/4/2020 or quarter 4 of 2019/20 for small employers. Interest will run on any unpaid PAYE/NIC for the tax year 2019/20
30 – Additional daily penalties of £10 per day up to a maximum of £900 for failing to file self-assessment tax return due on 31 January 2020