Until October 30th

VAT

• September 2026. Self-assessment 303

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

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

• September 2026. Operations assimilated to imports: 380

Environmental Taxes

• Third quarter 2026. Tax on the disposal of waste in landfills, incineration and co-incineration of waste. Self-assessment 593