When making your Self Assessment payment you will need your Self Assessment reference number, also referred to as your unique taxpayer reference (UTR). You'll find this on your payslip and on correspondence sent to you by HMRC - including the 'Notice to complete a Tax Return' if you file online, or on your paper tax return.
The reference number is made up of 11 characters, for example: 1234567890K.
To check that your reference number is correct, please enter it below then click on the 'Check reference' button.
