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31st January 2019
The is a £100 automatic penalty if your return is late.
The balance of your 2017/18 liability together with the first payment on account for 2018/19 are also due.
Capital gains tax payment for 2017/18.
Balancing payment - 2017/18 income tax, Classes 2 and NICs.
If you need any help completing your self assessment return please contact us.