How much to invoice to be self-employed in Spain

Many Spaniards send a few invoices and wonder if they really need to file "alta de autónomo".
Two legal triggers decide: habitual activity and net income at or above the 2026 SMI (€16,800 a year). Cross either and you must join Spain's freelance social-security scheme (RETA). This guide gives the exact 2026 numbers, recent Supreme Court criteria, RETA quotas, Tarifa Plana relief and the Verifactu e-invoicing rules.

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Quick Q&A

What is the minimum income to be self-employed in Spain?
Net profit that reaches the annual SMI (€16,800 in 2026).

How much can a freelancer invoice per year without registering?
Stay clearly below the SMI and work only occasionally, but the rule is a grey area.

Do I charge VAT if I earn below the SMI?
Yes - Spain has no domestic VAT threshold. You add 21 % IVA from the first euro.

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Minimum income you have to invoice to be self-employed (SMI Rule)

Cross the SMI and you must register - even once.
Courts use Spain's statutory minimum wage (SMI) as the reference: €16,800 in 2026.

• Net earnings ≥ SMI in a calendar year → mandatory RETA.
• 2026 SMI applies from January 1.
• Paid in 14 instalments: €1,200 a month.

Mini example
A photographer nets €1,500 a month. By year-end she reaches €18,000, above the 2026 SMI. She should have joined RETA at the start of the year.

Wrap-up: SMI works as the practical income floor. Keep a live tally of net profit.

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How much can a freelancer invoice per year without registering?

Below-SMI and truly occasional - maybe.
Advisers often accept issuing invoices with 15 % IRPF withholding, filing Modelo 036/037, and skipping RETA if:

• Net earnings ≤ SMI (≈ €13,300 net or €1,100 net a month used as "safe" limits).
• You invoice only a handful of clients a few times a year.

But Seguridad Social can still demand back-dated quotas if it decides the work is habitual.

Practical tips:

• Stay under 3 invoices a quarter.
• Keep emails proving it was a one-off job.
• Show you have a full-time employment contract elsewhere.

Wrap-up: The lower-income route is legal grey - register early if you see steady work ahead.

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Is regularity more important than income? The habituality test

Work every week? You must register, even below SMI.
The Supreme Court (case 2570/2021) confirmed that constant activity triggers RETA regardless of income.

Signs of habituality:

• Website or social media advertising services.
• Fixed office hours or rented workspace.
• Client list or retainer contracts.

Penalties for late registration:

• Back quotas from activity start.
• 20 % surcharge plus daily interest.

Wrap-up: Frequency beats euros. Invoice three times a week at €100 and you fail the test.

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How to register as self-employed once you cross the line

Two steps - Hacienda then Seguridad Social.

1. Hacienda: File Modelo 036 or the short 037 online. Choose your CNAE code.
2. Seguridad Social: Use Import@ss to join RETA within 60 days of your first invoice.

You need:

• Digital certificate or Cl@ve PIN.
• IBAN for direct-debit of quotas.
• Civil-liability policy if your profession requires it.

Wrap-up: Both filings take under an hour with a digital certificate. See our step-by-step alta guide.

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Bottom line

Cross either threshold - earning the SMI or working habitually - and you must register as autónomo in Spain. Costs range from zero when you invoice once a year to about €2,400 in annual RETA quotas plus VAT and income-tax paperwork.