On 1 September 2026, the Spanish Tax Agency (Agencia Tributaria) updated its official taxpayer calendar to detail all declarations and self-assessments with filing deadlines ending in September 2026. This annual calendar is a critical compliance tool for resident and non-resident taxpayers, tax advisors, and multinational enterprises operating in Spain. The publication aligns with the General Tax Law (Ley General Tributaria) which mandates the Agency to provide clear, accessible deadlines for periodic and annual tax obligations. The September calendar covers key regimes including VAT (Model 303), Corporate Income Tax advance payments (Model 202), Personal Income Tax withholdings (Models 111, 115), and Non-Resident Income Tax (Model 210). It also includes deadlines for special regimes such as the Immediate Supply of Information (SII) and the Temporary Solidarity Tax on Large Fortunes (Model 718). Taxpayers must verify the specific due dates applicable to their tax profile, as deadlines may vary by submission channel (electronic vs. paper) and taxpayer category (large enterprises, SMEs, individuals). Failure to meet these deadlines triggers surcharges, interest, and potential penalties under the General Tax Law.
Key Takeaways
- Comprehensive Deadline Consolidation: The calendar aggregates over 30 distinct tax models into a single reference, enabling finance teams to map out cash-flow requirements and avoid late-filing surcharges of 5%-20% plus statutory interest.
- Electronic Filing Mandate for Large Taxpayers: Entities with annual turnover exceeding €6 million must file all listed returns electronically via the Agency’s portal; paper submissions are not accepted, and the deadline is typically the 20th of the month following the taxable period.
- Special Regime Alerts: The calendar highlights the final filing window for the 2025 Temporary Solidarity Tax on Large Fortunes (Model 718) and the quarterly SII reporting deadline for September operations, both carrying heightened audit scrutiny.
Disclaimer: This article is compiled and summarized by the AI based on publicly available information and is for general information purposes only. It does not constitute any form of formal tax advice, legal opinion, or basis for performance. Please consult a qualified professional tax advisor or legal counsel for tax advice.
Source: Read Official Announcement