Purpose and the right form
Use Modelo 036 to register, change or cancel business, professional and withholding census details. It is separate from Social Security registration. Modelo 037 was withdrawn from 3 February 2025; do not follow an old 037 filing tutorial.
What to prepare
Prepare your NIF/NIE, activity start or cessation date, business and tax addresses, activity description, premises details and the tax obligations that apply. A company or representative may need supporting documents.
Spanish fields to review
Causas de presentación selects registration, changes or cancellation. Actividades económicas identifies the activity; IVA, IRPF and Retenciones concern different obligations. Do not select a tax regime merely because it appears in the form.
How to submit yourself
Open the official AEAT service below and select the correct year and period. Identify yourself using a method accepted by that service, or use an authorised representative. Complete the form, validate it, correct blocking errors and review warnings. Select the appropriate payment or result option. Finish the official signing and sending process yourself. Download the filed declaration and receipt with its verification code; a saved draft, preview or payment alone is not proof of filing. Censos WEB assists eligible individuals; the full 036 service covers other cases. Where paper filing is permitted, generate the official printable form and complete the separate delivery process.
Deadlines and payment
Initial registration is generally due before activities start. Changes and cessation generally have a one-month communication period, with exceptions and separate deadlines for particular tax options. Check the official rule for your selected cause.
Common mistakes and next steps
A 036 receipt does not prove RETA registration, permission to work or payment of tax. Check the resulting census details and any request for supporting documents.