until November 30

VAT

• October 2026. Self-assessment 303

• October 2026. Group of companies, individual form: 322

• October 2026. Group of companies, aggregated form: 353

• October 2026. One-stop shop - Import regime: 369

• October 2026. Operations assimilated to imports: 380

• Request for registration / cancellation. Monthly refund registry: 036

• Application for the common deduction scheme for differentiated sectors for 2027: without model

• SII. Waiver of electronic record keeping: 036

Environmental Taxes

• October 2026. Special tax on non-reusable plastic packaging. Presentation of accounting and inventory record book

• Year 2025. Tax on the value of electricity generation. Annual self-assessment: 583

• Year 2026: Tax on the value of electricity generation. Annual self-assessment for cessation of activity from January to October 2025: 588

Monthly information statement of the operations carried out by businesses or professionals adhering to the collection management system through any type of card and through payments associated with mobile phone numbers

• October 2026: 170

Monthly information return for accounts in all types of financial institutions and annual summary of withholdings and payments on account for income from movable capital and income obtained from consideration derived from accounts in all types of financial institutions

• October 2026: 196

Informative tax return for related-party transactions and transactions and situations related to countries or territories considered tax havens

• Year 2025: Companies whose tax period does not coincide with the calendar year: 232

Rest of companies: within the month following the ten months subsequent to the end of the tax period.