How to request registration in the Register of Liable Taxpayers
Find out how to request registration in the Census of Taxpayers once you have obtained your DNI or NIE
Registration in the census of Taxpayers occurs with the assignment of NIF .
If you have DNI or NIE and you are going to carry out or participate in operations of a nature or with tax significance, but you are not identified in AEAT , you can request inclusion in the Census of Taxpayers by submitting form 030.