Forms 036 and 037 are census forms that are filed with the Tax Agency to register in the Census of Businesses, Professionals and Withholders. Persons who are going to carry out certain activities in Spanish territory, as indicated in the sections Model 036/ Model 037, are obliged to register in the census.
In addition, these census declarations must be filed in order to make modifications to the identification data with the Tax Agency, such as a change of tax address, but also any modification that has been previously declared in this declaration or to report the start of another activity. These forms are also used to deregister from the census.