A right to work document is a form of identification or proof that shows that a person is legally allowed to work in the UK. Employers are required to check that all employees have the right to work before they can start their employment. These documents help ensure compliance with UK immigration laws and prevent illegal working. 

Examples of acceptable right to work documents include:

• A passport (current or expired) showing the holder is a British citizen or a citizen of the UK and Colonies having the right of abode in the UK.
• A passport or passport card (in either case, whether current or expired) showing that the holder is an Irish citizen.
• A document issued by the Bailiwick of Jersey, the Bailiwick of Guernsey or the Isle of Man, which has been verified as valid by the Home Office Employer Checking Service, showing that the holder has been granted unlimited leave to enter or remain under Appendix EU(J) to the Jersey Immigration Rules, Appendix EU to the Immigration (Bailiwick of Guernsey) Rules 2008 or Appendix EU to the Isle of Man Immigration Rules.
• A current passport, endorsed to show that the holder is exempt from immigration control, is allowed to stay indefinitely in the UK, has the right of abode in the UK, or has no time limit on their stay in the UK.
• A current Immigration Status Document issued by the Home Office to the holder with an endorsement indicating that the named person is allowed to stay indefinitely in the UK, or has no time limit on their stay in the UK, together with an official document giving the person’s permanent National Insurance number and their name issued by a government agency or a previous employer.
• A birth or adoption certificate (short or long) issued in the UK, together with an official document giving the person’s permanent National Insurance number and their name issued by a government agency or a previous employer.
• A birth or adoption certificate issued in the Channel Islands, the Isle of Man or Ireland, together with an official document giving the person’s permanent National Insurance number and their name issued by a government agency or a previous employer.
• A certificate of registration or naturalisation as a British citizen, together with an official document giving the person’s permanent National Insurance number and their name issued by a government agency or a previous employer.

You must check that the documents are genuine and that the person presenting them is the prospective employee or employee, the rightful holder and allowed to do the type of work you are offering.