Paying PAYE/CIS

you will need your 13 digit Accounts Office Reference Number which will have been sent to you by HMRC, and the 4 digit code

Paying corporation Tax

you will need your company UTR (unique tax reference) This is a 10 digit code that will have been issued to the registered office address of the company

Paying Self Assessment 

Self Assessment - This is the tax that you owe as an individual that hasn't already been through PAYE. You need to pay your self assessment bill by 31st January.

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To pay your self assessment bill you will need your 10 digit UTR number. If you are using online banking you will need to enter K after your UTR e.g. 0123456789K