Form guide
Modelo 421 of Canary Islands: Régimen simplificado. Declaración-liquidación trimestral
Form 421 (Régimen simplificado. Declaración-liquidación trimestral) is filed with the Agencia Tributaria Canaria (ATC, the Canary Islands Tax Agency). In 2026 it has 4 deadlines in the official calendar: the first falls due on 3 February 2026 and the last on 20 October 2026.
In a nutshell
- Filed with
- the Agencia Tributaria Canaria (ATC, the Canary Islands Tax Agency)
- For those taxed in
- Canary Islands
- How often
- Quarterly
- Deadlines in 2026
- 4, from 3 February 2026 to 20 October 2026
- Official calendar consulted on
- 21 September 2026
Who files it
Text from the official source, in Spanish
Personas físicas y entidades en atribución de rentas (con todos los partícipes personas físicas) con actividades incluidas en el régimen simplificado del IGIC, que sigue vigente (Orden de 4 de febrero de 2025).
Exceptions and special cases
Text from the official source, in Spanish
- Obligatoria telemática para colaboradores sociales y presentadores habituales.
All its deadlines
Each row is a deadline from the official calendar: the last day to file. When that day falls on a Saturday, Sunday or public holiday, the calendar already moves it to the next working day.
| Period | Last day | Day |
|---|---|---|
| 4T 2025 | 3 February 2026 | Tuesday |
| 1T 2026 | 20 April 2026 | Monday |
| 2T 2026 | 20 July 2026 | Monday |
| 3T 2026 | 20 October 2026 | Tuesday |
| 4T 2026 | 1 February 2027 | Monday |
Every deadline of the year, month by month: the 2026 tax calendar for Canary Islands.
The same obligation with other tax authorities
What is declared here with form 421 goes on a different form, with different deadlines, at other tax authorities. Which one applies to you depends on where you are taxed, not on where you live.
| Tax authority | Form | What it is |
|---|---|---|
| Mainland Spain and the Balearic Islands | 303 | IVA. Autoliquidación |
| Canary Islands | 420 | Impuesto General Indirecto Canario. Régimen general. Autoliquidación trimestral |
| Canary Islands | 417 | Suministro Inmediato de Información. Autoliquidación |
| Álava | 303 | IVA. Autoliquidación |
| Bizkaia | 303 | Autoliquidación del Impuesto sobre el Valor Añadido |
| Gipuzkoa | 300 | Declaración-liquidación trimestral de IVA. Régimen General |
| Gipuzkoa | 320 | Declaración-liquidación mensual de IVA. Grandes empresas |
| Navarre | F69 | Declaración-liquidación trimestral del IVA (régimen general y simplificado) |
| Navarre | F66 | Declaración-liquidación mensual del IVA (grandes empresas y devolución mensual) |
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 Canaria (ATC, the Canary Islands Tax Agency).
| For | Official link |
|---|---|
| File it | Presentación telemática del modelo 421 (sede ATC) |
| File format | Presentación colectiva (hasta 20 ficheros) |
| Instructions and help | Ficha del modelo 421 en la web de la ATC |
| File it | Trámite 4016 en la sede del Gobierno de Canarias |
| Instructions and help | Instrucciones del modelo 421 (PDF) |
| File format | Programa de ayuda 2026 multiplataforma |
Frequently asked questions
When is form 421 filed in 2026?
According to the official calendar of the Agencia Tributaria Canaria (ATC, the Canary Islands Tax Agency): 4T 2025, by 3 February 2026; 1T 2026, by 20 April 2026; 2T 2026, by 20 July 2026; 3T 2026, by 20 October 2026.
Who has to file form 421?
According to the Agencia Tributaria Canaria (ATC, the Canary Islands Tax Agency): “Personas físicas y entidades en atribución de rentas (con todos los partícipes personas físicas) con actividades incluidas en el régimen simplificado del IGIC, que sigue vigente (Orden de 4 de febrero de 2025).”
What happens if I file form 421 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 421 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 Canaria (ATC, the Canary Islands 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 Canary Islands Agencia Tributaria Canaria
- Presentación telemática del modelo 421 (sede ATC) Agencia Tributaria Canaria
- Presentación colectiva (hasta 20 ficheros) Agencia Tributaria Canaria
- Ficha del modelo 421 en la web de la ATC Agencia Tributaria Canaria
- Trámite 4016 en la sede del Gobierno de Canarias Agencia Tributaria Canaria
- Instrucciones del modelo 421 (PDF) Agencia Tributaria Canaria
- Programa de ayuda 2026 multiplataforma Agencia Tributaria Canaria
Keep reading
- Canary IslandsThe 118 deadlines of 2026 in Canary 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.