Last reviewed November 4, 2026
Registering as self-employed
Registering as self-employed combines the tax agency and Social Security. At the tax agency you file the census with form 036 (the e-office has electronic filing). At the Treasury, RETA registration comes before the activity starts.
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Who it is for
Someone who will work as self-employed in Spain. Act 20/2007 is the statute. Social Security affiliation, on the page already used for the affiliation number, is compulsory before you start.
1
Census at the tax agency
The e-office lets you complete, validate and send form 036 with Cl@ve, a certificate or DNIe. The result is a reply sheet with an entry number and a secure verification code.
2
RETA registration
The Treasury registers you in the self-employed scheme. It has to be done before you start invoicing. The Social Security number, if you do not have one, comes first: it is in the other guide.