Form guide
Modelo 036: Declaración censal de alta, modificación y baja
Form 036 (Declaración censal de alta, modificación y baja) is filed with the Agencia Tributaria (AEAT, the Spanish Tax Agency). It has no fixed deadline in the calendar: it is filed when whatever triggers it happens.
In a nutshell
- Filed with
- the Agencia Tributaria (AEAT, the Spanish Tax Agency)
- For those taxed in
- Mainland Spain and the Balearic Islands
- How often
- otra
- Deadlines in 2026
- No fixed date
- Official calendar consulted on
- 21 September 2026
Who files it
Text from the official source, in Spanish
Empresarios, profesionales y retenedores: alta antes de iniciar la actividad, modificaciones y baja. Desde el 3 de febrero de 2025 es el único modelo censal: el 037 quedó suprimido (Orden HAC/1526/2024).
Official links
Where it is filed, its instructions and, if there is one, the file format for importing it. All on the website of the Agencia Tributaria (AEAT, the Spanish Tax Agency).
| For | Official link |
|---|---|
| File it | Modelo 036 (trámite) |
| Instructions and help | Modelo 036: plazos de presentación (calendario 2026, modelos no periódicos) |
| Instructions and help | Manual de ayuda Censos WEB |
| File format | Diseño de registro 036 (xlsx) |
| File format | Diseños de registro modelos 01-99 |
| Instructions and help | Supresión del modelo 037 (Manual IVA 2025) |
Frequently asked questions
Who has to file form 036?
According to the Agencia Tributaria (AEAT, the Spanish Tax Agency): “Empresarios, profesionales y retenedores: alta antes de iniciar la actividad, modificaciones y baja. Desde el 3 de febrero de 2025 es el único modelo censal: el 037 quedó suprimido (Orden HAC/1526/2024).”
What happens if I file form 036 late?
If you file it before the tax authority has asked you to and there is an amount to pay, there is a surcharge of 1% plus another 1% for each full month of delay, and of 15% plus interest after twelve months (art. 27 of the Ley General Tributaria, the General Tax Act). If there is nothing to pay, the general penalty is €200, which drops to €100 if you file without having been asked; for information returns it goes by the item of data (art. 198). The details are in the guide to missed deadlines.
Does Mis Obligaciones file form 036 for me?
No. Mis Obligaciones suggests it in your calendar with the reason, takes you to its official page and reminds you a week before and the day before. The filing is done by you, or your gestoría (tax adviser’s office), on the website of the Agencia Tributaria (AEAT, the Spanish Tax Agency).
Official sources
Where what this page says comes from, consulted on the review date. If something does not match, the source prevails.
- 2026 tax calendar for Mainland Spain and the Balearic Islands Agencia Tributaria
- Modelo 036 (trámite) Agencia Tributaria
- Modelo 036: plazos de presentación (calendario 2026, modelos no periódicos) Agencia Tributaria
- Manual de ayuda Censos WEB Agencia Tributaria
- Diseño de registro 036 (xlsx) Agencia Tributaria
- Diseños de registro modelos 01-99 Agencia Tributaria
- Supresión del modelo 037 (Manual IVA 2025) Agencia Tributaria
Keep reading
- 2026 tax calendarThe 164 deadlines of 2026 in Mainland Spain and the Balearic Islands, month by month: the form, the period and the last day, copied from the official calendar. In .ics and .json.
- Filing lateWhat it costs to file a Hacienda form late or pay the Seguridad Social late: 1% per month, 15%, the €200 penalty and the 10% and 20% surcharges.
- Examples7 made-up profiles and the 2026 calendar that Mis Obligaciones’s rules give them: self-employed under direct assessment and under modules, companies, the Canary Islands, Bizkaia and Navarre.
- GlossaryWhat an autoliquidación, the 70% rule, REDEME, SII, IGIC, the Concierto Económico or RETA are, explained in two sentences with their official source.
This is information copied from official sources to help you find your way, not tax advice: your case may have exceptions. Check it on the authority’s website or with whoever advises you.
Your deadlines, and only yours
Tell Mis Obligaciones what you do for a living and it suggests your calendar for the year, each form with its reason. You review it, and it reminds you a week before and the day before.