A certificate or Cl@ve to file the census
To file modelo 036 or 037 on the Tax Agency site you have to identify yourself. For individuals, the procedure accepts an electronic certificate or Cl@ve when that route is provided.
What you use on the Tax Agency site
Census registration, modification, and deregistration are sent on the Tax Agency site. An individual uses a certificate or Cl@ve in the procedures that allow it. Without that identification the form is not filed, even if the PDF is filled in on your computer.
- The filing is on the Tax Agency site.
- An individual: certificate or Cl@ve, if the procedure allows it.
- A PDF saved locally is not the registration.
The app’s PFX is a different use
The PFX certificate you upload to Factura Fácil is for VeriFactu records. It does not file the census and it does not stand in for Cl@ve on the Tax Agency site. Those are different uses of the same kind of file.
Common questions
Can I use Cl@ve for modelo 036?
Yes, in the individual procedures the Tax Agency site accepts with Cl@ve. If your case requires a certificate, Cl@ve does not skip that.
Does the PFX I upload to the app file the registration?
No. That PFX is for VeriFactu records. The census is filed on the Tax Agency site, with a certificate or Cl@ve when the procedure allows it.
Official sources
Informational text reviewed on 26 September 2026. It is not tax advice and does not replace the Spanish Tax Agency or your accountant. Deadlines, rates, and forms can change.