How to register as a freelancer (autónomo): the 2026 complete guide
Updated: May 2026.
Becoming an autónomo is two filings: Modelo 036 with Hacienda (AEAT) and alta in RETA with Seguridad Social. Both can be done online in an afternoon if you already have a NIE and a digital certificate or Cl@ve. The trap is the order: 036 first, RETA second, and never the other way round, or your tarifa plana dies before it starts. This guide walks the entire process end to end: prerequisites, every box on Modelo 036, IAE codes, IVA and IRPF regimes, the RETA alta, the 2026 tarifa plana, regional cuota cero subsidies, your first 12 months of tax filings, common mistakes, and how to know when an SL is the better answer.
Quick answer
Two filings, in order: AEAT Modelo 036 first, then RETA alta in Importass.
Cost to register: €0. Both filings are free.
What you need: NIE (foreigners), digital certificate (FNMT) or Cl@ve, IBAN, your IAE epígrafe.
Year 1 cost: €88.64/month tarifa plana + ~€60-100/mo gestor (optional).
Year 2+: €206-€607/month cuota by 15-tramo bracket, plus IRPF and IVA.
Modelo 037 was abolished 9 February 2025. Every alta in 2026 uses Modelo 036.
Time: 30-60 minutes if your epígrafe and regimes are decided in advance.
Two separate registrations, with two separate authorities, that together make you a legal self-employed worker.
AEAT (Hacienda): Modelo 036 adds you to the Censo de Empresarios, Profesionales y Retenedores. From that moment you can issue invoices, you owe IVA and IRPF, and you must file the corresponding quarterly returns.
Seguridad Social: alta in the Régimen Especial de Trabajadores Autónomos (RETA) gives you healthcare, pension contributions, sick leave, and the right to bill clients without legal risk. You start paying the cuota the day you alta.
Both filings are free. Both are mandatory the moment you start working as a freelancer in a continuous way. Working without alta is regularly fined by Hacienda (€400 minimum, LGT Art. 198) and by TGSS (retroactive cuotas with a 20% surcharge and additional fines from €300 to €3,000).
Who needs to register
You need alta the moment your work is habitual, personal, and direct. The Tribunal Supremo set the threshold loosely: any economic activity where you earn above SMI in a year is presumed habitual. Below SMI you might still need alta if the activity is continuous (regular invoices, your own clients, your own tools).
Spanish nationals: alta from day one of activity.
EU/EEA citizens: same. NIE is required first.
Non-EU foreigners: need a residence and work permit that covers self-employment (cuenta propia, Digital Nomad Visa, Beckham-eligible role, family reunification with cuenta propia, etc.). NIE is required first. See our guide on can a foreigner register as autónomo.
Occasional one-off work (a single project of low value) may not require alta, but the line is fuzzy. Hacienda will tell you it does. Treat any second invoice from the same activity as proof of habituality.
Prerequisites: NIE, digital certificate, bank
NIE (foreigners only): Número de Identidad de Extranjero. Apply at a Spanish consulate before arrival or at a Comisaría de Policía once you've landed. Without NIE you cannot file Modelo 036. See how to get an NIE number in Spain.
Digital certificate or Cl@ve: Certificado FNMT is requested online, then validated in person at a Hacienda or Seguridad Social office. Cl@ve PIN/Permanente is faster: register online with your NIE/DNI and a verification code by SMS. Either works for both AEAT and Seguridad Social.
Spanish IBAN: needed for the SS direct debit and for invoicing in euros. Most banks open accounts with your NIE and a passport.
Mutua collaboradora: a private collaborating mutua that covers your sick leave and accidents. Pick one before the RETA alta. Most autónomos pick MC Mutual, Fraternidad-Muprespa, Asepeyo, or Umivale.
Costs at a glance
Registration is free. The recurring costs once you alta:
Tarifa plana year 1: €88.64/month (€80 base + 0.9% MEI).
Year 2 onwards: €205.88 to €607.31/month, depending on net profit (15 brackets).
IRPF advance (Modelo 130): 20% of cumulative net profit, quarterly, unless 70%+ of revenue is already withheld at source.
IVA (Modelo 303): output IVA collected from clients minus input IVA paid on expenses, quarterly.
Order matters. Hacienda first, then Seguridad Social, on the same day or with RETA up to 60 days later. The reverse fails: a RETA alta dated before your 036 will be rejected, and trying to fix the dates retroactively is the most common cause of tarifa plana denial.
File Modelo 036 at AEAT declaring your activity start date. The 036 must be filed before the start of activity.
Wait for AEAT confirmation. The acuse de recibo arrives instantly online.
File the RETA alta in Importass using Modelo TA.0521. Same start date as on the 036, or up to 60 days later.
Set up direct debit for the cuota with the IBAN you'll use.
Step-by-step Modelo 036
Modelo 036 is your tax "on switch". One form, one filing, three decisions: your IAE epígrafe, your IVA regime, your IRPF regime. Modelo 037 was abolished by Orden HAC/1526/2024 on 9 February 2025; if you find a 2024-or-older guide telling you to use the 037, ignore it.
File at sede.agenciatributaria.gob.es → "Todos los trámites" → "Censos, NIF y domicilio fiscal" → "Censo de empresarios, profesionales y retenedores. Modelo 036" → "Presentación".
What you'll fill in:
Personal details: name, NIF/NIE, fiscal address, contact info.
Causa: "Alta en el Censo de Empresarios, Profesionales y Retenedores".
Activity start date: the day you start working. Sets all your filing deadlines.
Activity address: where you actually work. Often the same as your fiscal address; it can differ.
IAE epígrafe in box 402 (multi-activity: declare every code).
IVA regime: general, recargo de equivalencia, REAGP, exenta. Tick ROI/VIES in box 582 if you'll invoice EU clients.
IRPF regime: estimación directa simplificada (default) or módulos.
When you finish, press Validate tax record, then Sign and send. The acknowledgement (acuse de recibo) is your proof of alta. Save the PDF.
Choosing your IAE epígrafe
The IAE (Impuesto sobre Actividades Económicas) epígrafe is the activity code that defines what you do. It does not actually cost you anything: most freelancers are exempt from paying IAE because they earn under the €1,000,000 turnover threshold. But the code is mandatory, and picking the wrong one is the single most common 036 mistake.
Three sections:
Sección 1ª, Empresariales. Examples: 504 (instalaciones), 651 (comercio textil), 691 (reparaciones). No automatic IRPF retention from your B2B clients.
Sección 2ª, Profesionales. Examples: 731 (abogados), 763 (programadores informáticos), 776 (ingenieros), 511 (arquitectos). Your B2B Spanish clients withhold 15% IRPF on every invoice (or 7% in your first three years if you opt in).
Sección 3ª, Artísticas. Examples: 011 (cine), 014 (música), 042 (deportistas). Specific retention rules per activity.
Worked example. You're an IT developer. Type 763 in the Buscador de actividades, press Seleccionar. The system locks the code into box 402.
If you have multiple activities (consulting plus a small e-commerce, say), declare both epígrafes. Missing an ancillary activity is one of Hacienda's favourite reasons to issue a requerimiento later. Once you've chosen, set the location of the activity:
Picking your IVA regime
Most service freelancers go with the régimen general: 21% standard, 10% reduced, 4% super-reduced. You collect IVA from clients, deduct IVA paid on your business expenses, file Modelo 303 quarterly.
Régimen general: the default for almost all consultants, developers, designers, marketers, contractors.
Recargo de equivalencia: mandatory for retailers (no transformation of the goods, >80% sales to consumers). Suppliers add a surcharge (5.2%, 1.4%, 0.5%, or 1.75% on tobacco) and the retailer files no Modelo 303.
REAGP: agriculture, livestock, fishing. Flat compensation 12% or 10.5%.
Exempt activities: medical, education, art under specific conditions (Art. 20 LIVA). No IVA on invoices, no input IVA recoverable.
ROI/VIES alta (box 582): tick this if you invoice EU clients. Without it you must charge 21% to EU B2B, which kills competitiveness.
Picking your IRPF regime
Estimación directa simplificada (default): real income minus real expenses, with a 5% flat deduction for "difficult to justify" expenses, capped at €2,000/year. Auto-applies under €600,000 turnover.
Estimación objetiva (módulos): only certain activities (taxi, small retail, hospitality), with thresholds (€250,000 sales to consumers, €125,000 to companies, €250,000 in purchases). Tax is calculated on a fixed-amount table, not your real numbers. If your real expenses are high, módulos almost always taxes you on phantom profit.
Switching from módulos back to directa requires a renuncia filed in December for the following year (Modelo 036, box 600s). Pick directa unless your gestor specifically tells you módulos is cheaper for your activity.
Step-by-step RETA alta in Importass
RETA = Régimen Especial de Trabajadores Autónomos. The alta gives you healthcare, pension contributions, and the right to bill clients legally.
File at portal.seg-social.gob.es/wps/portal/importass → "Altas, bajas y modificaciones" → "Alta en trabajo autónomo" → Modelo TA.0521.
What the form needs:
Activity start date: match the date on Modelo 036.
IAE epígrafe and CNAE: the same one you put on the 036.
Fiscal address.
Mutua collaboradora: pick one (MC Mutual, Fraternidad, Asepeyo, Umivale, etc.).
IBAN: for the cuota direct debit.
Base de cotización: normally auto-fills from your tarifa plana election. From year 2 you pick the bracket that matches your expected net profit.
Tarifa plana election: tick the box to apply the €80 + MEI rate for 12 months.
The alta date is the moment your cuota clock starts. File at most on the same day as the 036, no later. Up to 60 days before the start date is fine. After is not.
Tarifa plana €88.64 + regional cuota cero
For 2026, the state tarifa plana is set by RDL 16/2025, continuing Ley 31/2022:
€80 base + 0.9% MEI = €88.64/month for the first 12 months from the RETA alta.
Extendable for a second 12 months if your year-2 net income is below the SMI 2026 (€1,184/mo).
Requirements: no RETA alta in the previous 2 years (3 years if you previously used tarifa plana), no debts with AEAT or TGSS.
Several autonomous communities layer a cuota cero subsidy on top, refunding part or all of the €88.64. Active 2026 programs include Madrid (year 1 + extension if income < SMI), Andalucía (year 1 full reimbursement), La Rioja, Extremadura, Baleares, Galicia, Murcia, Canarias, Castilla-La Mancha. Check the live regional page before you alta because the subsidy applications usually have their own deadlines and most regions only refund retroactively after you've paid.
The 15-tramo system from year 2
From month 13, your cuota is indexed to your real net monthly profit (rendimiento neto computable). For 2026, RDL 16/2025 froze the brackets at 2025 levels; only the MEI surcharge moved (0.8% to 0.9%):
≤ €670/mo profit: €205.88/mo cuota
€670 to €900: €226.47/mo
€900 to €1,166.70: €267.64/mo
€1,166.70 to €1,300: €299.64/mo
€1,300 to €1,500: €302.64/mo
€1,500 to €1,700: €302.64/mo
€1,700 to €1,850: €319.12/mo
€1,850 to €2,030: €324.26/mo
€2,030 to €2,330: €329.41/mo
€2,330 to €2,760: €349.98/mo
€2,760 to €3,190: €380.85/mo
€3,190 to €3,620: €401.43/mo
€3,620 to €4,050: €432.29/mo
€4,050 to €6,000: €514.61/mo
Above €6,000: €607.31/mo
You change brackets up to six times a year (March, May, July, September, November, January). At year-end, TGSS regularises against your real Renta declaration and either refunds or charges the difference.
Your first 12-month tax calendar
Once 036 is filed and RETA is active, your filing calendar starts. Standard service freelancer in régimen general + estimación directa simplificada:
Modelo 130 (IRPF advance, 20% of cumulative net profit): same dates as 303. Exempt if 70%+ of your invoices already have IRPF withheld at source by Spanish B2B clients.
Modelo 111: if you withhold IRPF from professionals or employees you pay. Quarterly.
Modelo 115: if you pay rent for a business premises and withhold IRPF on it. Quarterly.
Modelo 390 (annual IVA summary): 1-30 January.
Modelo 347 (operations with third parties > €3,005.06): February. Watch the single-supplier trap: even one annual invoice from one supplier above €3,005.06 (IVA included) triggers the obligation.
Modelo 349 (intra-EU operations): monthly or quarterly depending on volume.
Modelo 100 (annual Renta): April-June. Reconciles your full year's IRPF.
Set reminders 10 days before each deadline. Recargos start at 1% per month and climb.
Verifactu and your invoicing software
Verifactu is the new mandatory standard for invoicing software, set by Ley 11/2021 plus RD 1007/2023. It requires every invoice to be generated by a SIF (Sistema Informático de Facturación) that signs records cryptographically and can transmit them in real time to AEAT.
Sociedades: mandatory from 1 January 2027.
Autónomos: mandatory from 1 July 2027 (deadline pushed back from January 2026).
Penalty for non-compliant software: up to €50,000 per ejercicio.
You don't need a Verifactu tool the day you alta in 2026, but if you're picking invoicing software now, pick a Verifactu-ready one. Holded, Quipu, FacturaScripts (free, self-hosted), and the renn platform are all on the list.
Common mistakes and how to fix them
Wrong IAE epígrafe. Hacienda reclassifies retroactively, demands back IRPF retentions, and sometimes back IVA at the right rate. Fix: file a 036 modificación the moment you spot it.
036 filed after RETA alta. The dates conflict and tarifa plana is denied. Fix: contact TGSS immediately with the 036 acuse de recibo; sometimes the alta date is corrected if the filings are within 24 hours of each other.
Módulos picked by accident. Real expenses higher than module estimates means you pay tax on phantom profit. Fix: file a renuncia in December (036, casillas 600s) for the following year.
Ancillary activity not declared. Triggers Art. 198 sanctions. Fix: 036 modificación adding the missing epígrafe.
Fiscal address ≠ activity address. Notifications go to the wrong place; you miss requerimientos. Fix: 036 modificación, casilla 124.
Modelo 347 single-supplier trap. One supplier ≥ €3,005.06 a year = mandatory declaration. Fix: file Modelo 347 in February with the supplier listed.
No ROI/VIES alta. EU clients refuse invoices with 21% IVA. Fix: 036 modificación ticking box 582; lead time of a few weeks for AEAT to validate the VIES number.
Working without alta. €400 minimum AEAT fine plus retroactive RETA cuotas with a 20% recargo. Fix: alta now and negotiate the back payment with TGSS; voluntary correction usually halves the AEAT fine.
Autónomo or SL? when to switch
An autónomo pays personal income tax (IRPF) on net profit, with the bracket scaling up to 47%. An SL (Sociedad Limitada) pays Impuesto de Sociedades at 25% (or 23% for SMEs in their first profitable years), then you decide how to take the money out (salary, dividends, both). The crossover is usually around €60,000 of net profit, but it depends on whether you reinvest in the business, hire employees, or want to limit personal liability.
Stay autónomo if your net profit is under ~€50,000, you work alone, and the activity is not capital-intensive. Switch to an SL if you want to limit liability, you have partners, or you reinvest most of your profit. Full breakdown: autónomo to SL: when to switch.
FAQ
Is Modelo 037 still valid? No. It was abolished 9 February 2025. All altas now use Modelo 036.
How long does the registration take? 30-60 minutes online if your IAE, IVA, and IRPF choices are decided in advance. Confirmation is instant.
Does it cost money? No. Both 036 and the RETA alta are free.
Can I register from abroad? Yes if you have a NIE and a Spanish digital certificate. The certificate validation may need an in-person visit at a Spanish consulate.
What if I'm late and start working without alta? File now. AEAT base fine is €400 (LGT Art. 198), reduced to €200 if voluntary. TGSS will charge retroactive cuotas with 20% recargo. Tarifa plana is lost permanently.
Can I have two activities? Yes. Declare every IAE epígrafe in box 402 of Modelo 036.
Do I need a gestor? Not legally. Most autónomos earning above €1,500/mo find one pays for itself in errors avoided.
Can I switch from autónomo to SL later? Yes. Baja in RETA, dissolve the autónomo activity, register the SL. We handle the transition end to end.
renn handles the whole alta in one flow: digital certificate setup, Modelo 036 filing with the right IAE/IVA/IRPF combination for your activity, RETA alta in Importass, tarifa plana election, mutua selection, and the regional cuota cero application where it applies. From day one we run your quarterly Modelos 303, 130, 111, 115, the annual 390, 347, and 100, and Verifactu-compliant invoicing. Real accountants on the file, the platform handling the paperwork rhythm.
