Registration & RETA
Modelo 036 for autónomos: registration, changes and closure with examples
How to turn a real activity into census obligations, review the form and manage later changes or closure.
Direct answer
Modelo 036 is the tax configuration of your activity with AEAT. It reports registration, changes and closure while assigning IVA, IRPF, withholding, addresses and EU-operation settings. It must describe the real business rather than a generic set of boxes.
1. Modelo 036 is not a generic licence to invoice
Every selection has a consequence. IAE describes the tax activity, IVA settings classify operations and IRPF settings establish assessment and periodic obligations.
Selecting more options for safety can create unnecessary returns; omissions can leave transactions misclassified.
- Separate principal and additional activities.
- Distinguish tax address, management location and business premises.
- Check withholding duties for rent, staff and professional suppliers.
2. Example: a professional serving Spain and the EU
A consultant serves Spanish companies and a German company. The 036 must reflect the profession, IVA, IRPF and, before a qualifying intra-EU operation, ROI registration. The customer's VAT ID is then checked in VIES and invoice, ledgers, Modelo 303 and Modelo 349 must agree.
A foreign address alone does not make an invoice free of Spanish IVA. Customer status, transaction type and place of supply come first.
- IAE matches the service.
- ROI is obtained before the relevant operation.
- Assigned returns are reviewed after filing.
3. Prepare the registration data
Gather identity, address, start date, activities, IAE, locations, IVA, IRPF and possible withholding. Record why each setting was selected.
Modelo 037 has not existed since 3 February 2025; former simplified cases also use Modelo 036.
- Use the effective date.
- Do not confuse IAE and CNAE.
- Download the full copy and receipt.
4. Changes: the census must follow the business
A new address, activity, premises, staff or EU operations may require a modification. Do not postpone a structural change until the quarterly return.
Keep a chronology of what changed, when, which fields changed and which obligations were added.
- Check the deadline for the specific change.
- Keep old and new versions.
- Update invoices, ledgers and calendar from the effective date.
5. Closure does not erase history
When all activity ends, report the real date and coordinate census closure with RETA. Closure does not cancel final returns, debts, later receipts or document retention.
Social Security allows closure to be scheduled up to 60 days ahead and provides a limited period after cessation before it is considered late.
- Issue necessary rectifying invoices.
- File final assigned returns.
- Retain ledgers, invoices and receipts.
6. Review after submission
Open the final copy and verify reason, date, activities and obligations. Save PDF and CSV by date and create tasks produced by the new settings.
- Correct effective date.
- No unexpected returns.
- Current address and contact details.
- RETA, invoicing and calendar aligned.
Frequently asked questions
Are Modelo 036 and RETA the same?
No. Modelo 036 configures the activity with Hacienda; RETA registers self-employment with Social Security.
Do I file a 036 for every customer?
No. It is used for census changes. A customer matters when it changes a reportable circumstance, such as starting relevant intra-EU operations.
Does closure cancel outstanding returns?
No. Final obligations remain and documents must be kept; closure does not repair earlier periods.
Official sources
- AEAT — Trámites censales Modelo 036
- AEAT — Plazo de la declaración de alta
- Seguridad Social — Baja en trabajo autónomo
General information only, not tax, labour or legal advice. Check your case against current official sources or with a qualified professional.