Updated: May 2026. Spain has no official "part-time autónomo" category. Register to freelance even one hour a week and you pay full Social Security contributions and file the same quarterly returns as someone billing full-time. The only legal route to lower costs is pluriactividad - being employed and self-employed simultaneously. This guide covers what the law says, how pluriactividad works under the 2023 reform rules still in force in 2026, what it costs, and how to register without losing the €87.6 Tarifa Plana. Sits alongside the autónomo guide and the registration walk-through.
Quick answer
No part-time category exists. You register as autónomo full-stop. Same quarterly filings as a full-time freelancer.
Tarifa Plana still applies. If you have not been autónomo in the last 2 years, your cuota is €87.6/month for the first 12 months.
Pluriactividad gives a year-end refund, not a monthly discount. If your combined Social Security contributions (employer + RETA) exceed the annual ceiling, TGSS refunds 50% of the excess automatically.
Check your employment contract first. Exclusivity clauses can make outside self-employment grounds for dismissal.
Registration time: about 30 minutes online once your digital certificate or Cl@ve PIN is active.
What "part-time self-employed" means legally
Spanish law (Ley 20/2007 del Estatuto del Trabajo Autónomo) acknowledges the concept of part-time self-employment but never turned it into a workable legal category. RETA, the Social Security regime for freelancers, charges contributions based on declared net income - not hours worked. A designer billing 5 hours a month and a consultant billing 50 register identically and face the same obligations.
The practical consequence: the minimum RETA cuota applies from day one regardless of revenue. If your freelance income does not cover the cuota plus the cost of tax filings, the numbers do not work. Estimate your income honestly before registering.
The one meaningful exception is pluriactividad - working as an employee and as autónomo at the same time. That regime is covered below.
Before you register: check your employment contract
If you are currently employed, read your contract before registering as autónomo. Many employment contracts include exclusivity or non-compete clauses that restrict outside self-employment. Breaching one can be grounds for dismissal.
Look for exclusivity, conflict-of-interest, or non-compete clauses.
Check whether the clause covers your exact planned activity or only direct competitors.
If the clause is ambiguous, get written clarification from HR or a labour lawyer before registering.
Public-sector employees need formal authorization from their employer before registering as autónomo.
Once confirmed there is no obstacle, you can proceed to registration.
How to register and your basic obligations
Registration is identical to full-time autónomo registration. You need:
DNI or NIE (valid, not expired).
Spanish or SEPA-zone IBAN for the cuota auto-debit.
Turn on DEHú electronic notifications at dehu.redsara.es so you do not miss AEAT or TGSS notices.
From that point your obligations are the same as any autónomo:
Quarterly VAT filing (Modelo 303): 1–20 April, July, October, January.
Quarterly IRPF advance (Modelo 130): same dates. Skip if 70% or more of your invoices carry a 15% retención (or 7% in your first three years).
Annual IRPF return (Modelo 100): April to June the following year.
Issue compliant invoices. VeriFactu certified invoicing becomes mandatory for autónomos on 1 July 2027.
The "pluriactividad" regime – combining employment and self-employment
Pluriactividad means you are registered both as an employee (paying Social Security through your employer) and as autónomo (paying RETA cuota). Both contribution streams run at the same time.
How it works in 2026:
The 2023 income-based contribution reform removed the old upfront monthly reductions for pluriactividad. The mechanism is now a year-end refund:
TGSS calculates your total SS contributions across the year - employee contributions paid through your employer plus your RETA cuota.
If the total exceeds 60% of the maximum annual contribution base, TGSS automatically refunds 50% of the excess.
The refund arrives in the first months of the following year with no application needed.
To qualify:
You must be both employed (with active SS contributions through an employer) and registered as autónomo simultaneously.
The refund is calculated on the full calendar year; partial-year registration reduces the amount proportionally.
What pluriactividad does not change:
Your RETA cuota. You still pay the income-band rate - or €87.6/month under Tarifa Plana if this is your first registration.
Your quarterly filing obligations.
Hours worked. There is no minimum or maximum hours threshold.
The Tarifa Plana and the pluriactividad refund can both apply in the same year if you are a first-time autónomo who is also employed.
Cost and cuotas in 2026
Cuotas are based on declared net income, not hours. The 2026 table is frozen at 2025 levels with the MEI surcharge at 0.9%. Full table in autónomo costs.
Key figures:
Tarifa Plana (Cuota Reducida): €87.6/month for the first 12 months if you have not been autónomo in the last 2 years (or 3 years if you previously claimed the discount). Detail in the reduced rate guide.
Minimum regular cuota: approximately €200/month (income band €0 to €670 net/month).
Maximum cuota: approximately €590/month (income above €6,000 net/month).
Additional recurring costs to budget:
Gestoría or accounting software for quarterly filings: €50 to €150 per quarter.
VeriFactu-compliant invoicing software: required from 1 July 2027.
If you would rather not track the paperwork yourself, renn handles autónomo registration end-to-end and keeps your TGSS status clean by default.
Tax treatment and deductions
Being autónomo part-time does not reduce your tax obligations. You file:
Modelo 303 (quarterly VAT): output VAT minus input VAT, paid to AEAT each quarter.
Modelo 130 (quarterly IRPF advance): 20% of net freelance profit per quarter.
Modelo 100 (annual IRPF): all income sources combined - employment salary plus freelance profit.
If you are also an employee, your salary and freelance income are added together for IRPF. This can push you into a higher bracket. Adjust your Modelo 130 payments upward if combined income exceeds €20,200 to avoid a large year-end bill.
Deductible expenses are the same as full-time autónomos:
Home office (proportional share of rent, utilities, internet based on percentage of space used).
Equipment and software directly related to the activity.
Professional training and subscriptions.
Travel and client-related expenses.
Keep separate accounting records for employment and freelance income. Mixing them creates reconciliation problems on Modelo 100.
Common mistakes
Filing RETA after the AEAT start date. This permanently forfeits the Tarifa Plana for this registration attempt. File Modelo 036/037 at AEAT first, then register at RETA the same day. Never the other way around.
Assuming pluriactividad means a lower monthly cuota. Under the 2023 reform it does not. The benefit is a year-end automatic refund from TGSS, not a reduced monthly payment.
Not reading the employment contract before registering. An exclusivity clause can make outside self-employment grounds for dismissal. Check before you file.
Setting the income band too low. If actual freelance income is higher than declared, TGSS recalculates at year end and charges the difference plus a surcharge.
Filing nothing in a zero-revenue quarter. Even with no invoices in a quarter, you still file a zero-return Modelo 303 and Modelo 130. Missed filings trigger automatic penalties.
Forgetting the Tarifa Plana ends at month 13. The cuota jumps to the income-band rate automatically. Update your declared income band before month 13 to avoid a gap between what you pay and what you owe.
Practical checklist to get started
Estimate your expected monthly net income from freelance activity.
Check your employment contract for exclusivity or non-compete clauses.
Obtain a valid digital certificate or Cl@ve PIN if you do not have one.
Choose your IAE epígrafe (activity code).
File Modelo 036/037 at AEAT. Tick Tarifa Plana if eligible.
Register with RETA at Importass the same day. Pick your contribution base and select a mutua.
Enrol in DEHú electronic notifications.
Set up VeriFactu-ready invoicing software before July 2027.
Review your income band and declared contribution base at month 12 before Tarifa Plana expires.
FAQ
Can I work as autónomo for just a few hours a week? Yes. There is no minimum hours threshold. You register, pay the cuota, and file quarterly returns regardless of how few hours you bill.
Can I be autónomo while on a student visa? No. Student visas do not authorise self-employment. You need a residency permit or a work authorisation that covers self-employment. Detail in can a foreigner register as autónomo.
What happens if I stop freelancing after a few months? File a baja at RETA to cancel your Social Security registration and file Modelo 036/037 as a deregistration at AEAT. Detail in how to deregister as autónomo.
Do I still pay the full cuota if I earn nothing in a month? Yes, unless you are on Tarifa Plana (which is still €87.6). The cuota is monthly regardless of that month's income. You can adjust your income band up to six times per year if earnings change.
Can I have the Tarifa Plana and the pluriactividad refund at the same time? Yes. The Tarifa Plana applies to your RETA cuota as a first-time autónomo. The pluriactividad refund applies to the combined total of employer SS + RETA contributions. Both can apply in the same year.
Is a gestoría required? Not legally. But quarterly filings and the annual Modelo 100 take time, especially when combining employment and freelance income. Many part-time autónomos use a gestoría for the first year. More on what gestors do at what is a gestor.
Bottom line
Working part-time as autónomo is legal and common. The law does not give you a discount for fewer hours. What it does offer: Tarifa Plana at €87.6/month for the first year, a year-end SS refund if you are also employed under pluriactividad, and the same deductions as full-time freelancers. Check your employment contract before filing, submit Modelo 036/037 at AEAT before RETA on the same day, and enrol in DEHú from day one. If you would rather not manage the paperwork, renn handles autónomo registration end-to-end and keeps your TGSS status clean.
