Until September 21st

Income and Corporation Tax

Withholdings and payments on account of work income, economic activities, prizes and certain capital gains and income imputations, gains derived from shares and interests in Collective Investment Institutions, income from leasing urban real estate, movable capital, authorized persons and account balances, and income from non-residents obtained without a permanent establishment.

• August 2026. Large companies: 111, 115, 117, 123, 124, 126, 128, 216, 230

VAT

• July and August 2026. Recapitulative return on intra-Community operations: 349

• Request for refund by taxpayers under the simplified regime of VATand who carry out the activity of transporting passengers or goods by road, by acquiring certain means of transport: 308

Insurance Premium Tax

• July and August 2026: 430

Manufacturing Special Taxes

• June 2026. Large companies: 561, 562, 563

• August 2026: 548, 566, 581

• August 2026: 573 (Self-assessment), A24 (Refund request)

• Declaration of operations by registered recipients and tax representatives: 510

Special Electricity Tax

• August 2026. Large companies: 560

Environmental Taxes

• August 2026. Special tax on non-reusable plastic packaging. Self-assessment 592

• Year 2026. Tax on the value of electricity generation. Second split payment: 583

Tax on Financial Transactions

• August 2026: 604

Tax on interest margin and commissions of certain financial institutions

• Year 2025: 780 (Self-assessment)