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Tax obligations for Autónomos beyond filing

The compliance requirements freelancers in Spain need to meet beyond the quarterly and annual returns themselves.

Last reviewed: 2026-06-15Records generally need to be retained for several years after the relevant tax year — check the current required retention period, since it's reviewed periodically.

This guide is not yet verified by Tuchati's editorial review — treat it as a helpful starting point, not a final legal answer.

Overview

Filing your quarterly and annual returns is only part of being tax-compliant as a freelancer in Spain — there are also registration, record-keeping and retention obligations that matter if you're ever reviewed. This guide covers the compliance side beyond the filings themselves.

Requirements

  • Applies to anyone registered as self-employed (autónomo) in Spain

Step-by-step process

  • Register your specific economic activity correctly via Modelo 036/037, using the right activity code (epígrafe) — this affects which taxes and exemptions apply to you
  • Check whether you owe Business Activity Tax (Impuesto de Actividades Económicas, IAE) — most individual freelancers are exempt below a turnover threshold, but it's worth confirming for your specific situation
  • Keep the required accounting records (libros registro) — generally a record of income, expenses, and if applicable, invoices issued and received, kept in a specific format
  • Retain your invoices, receipts and accounting records for the legally required period, since the Agencia Tributaria can request them for several years after filing

Required documents

  • Modelo 036/037 registration
  • Accounting records (libros registro) for income and expenses
  • All invoices issued and received

Common mistakes

  • Registering under the wrong activity code, which can affect your VAT treatment and eligibility for certain exemptions
  • Not keeping organised accounting records throughout the year, making both quarterly filings and any future review far more stressful than necessary

Practical tips

  • Simple accounting software built for Spanish autónomos can maintain compliant records automatically as you issue and receive invoices, rather than reconstructing them at filing time
  • If you're ever selected for a review (an inspección or a simpler comprobación), having organised, retained records from day one is the single biggest factor in how smoothly it goes

How Tuchati can help

If you're setting up as a freelancer and want to understand the full scope of what's required beyond just filing your returns, Tuchati can help you get compliant from the start.

Tax obligations for Autónomos beyond filing — Help Centre — Tuchati