This information is based on government guidance retrieved April 2018.  
https://www.gov.uk/pay-self-assessment-tax-bill/

When do I need to pay?

We recommend you make payments as soon as you can, the dates below are deadlines.

You maybe required to make two advance payments ‘on account’ as a way of spreading your tax bill. These are based on your previous year.

31st January – balancing payment for tax for the previous year.
– first payment on account.

31 July – second payment on account (not required for all).

Your payment method must clear by the deadline in order to avoid surcharges. Make sure you leave enough time depending on the method you wish to use. The quickest way to pay HMRC is online.

How can I pay?

Bank Transfer
Bank Transfer
card payment
Online by Card
Direct Debit
Direct Debit
Post
Post a Cheque

 

You can only pay in person at a bank or building society using a payslip posted to you by HMRC.

Useful HMRC links:

Pay Your Self Assessment Online
https://www.tax.service.gov.uk/pay-online/self-assessment

Bank Account Details
https://www.gov.uk/pay-self-assessment-tax-bill/bank-details

Print a payslip for postal cheque payments
http://www.hmrc.gov.uk/gds/payinghmrc/payslip-sa1.htm

How much should I pay?

We provided you with the amount to pay after we filed your tax return on your behalf. Our covering letter for your final tax calculation states the amount clearly for you.

This may have been provided to you by email. If so, your final tax calculation will also be available for your reference in your secure Document Portal.

If you are having problems paying…

HMRC Self Assessment Payment Helpline

Telephone: 0300 200 3822

Opening times:

8am to 8pm, Monday to Friday
8am to 4pm, Saturday

Closed Sundays, Christmas Day, Boxing Day and New Years Day.

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