If the law firm's client is a non UK resident, who does not have a National Insurance Number, then the firm is
able to enter a reference such as a passport number into Stamp Tax Online instead.
Information should be added into Box 51 part 2 and Box 51 part 3, as follows:
Question 51 — second part
For an individual who does not have a permanent National Insurance number,
enter one of the following:
- non-UK tax reference number
- passport number
- driving licence number
- ID card number
For a non-individual, you can either enter a company registration number
(issued by Companies House) or, if you do not have this, a non-UK tax reference.
If you answered the second part question 51 you also need to answer the third
part of question 51.
Question 51 — third part
Enter the country where the reference number was issued.

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