Check the main tax obligations for the month of October.
| Tax | Date | Obligation |
| IRS/IRC/VAT | Until 6th | Communication of invoices to the Tax Authority (SAFT) |
| IRS and Social securuty | Until the 10th | Submission of the DMR and Payroll Declarations |
| Social Security | Until the 20th | Payment of Social Security contributions |
| VAT | Until the 20th | Submission of the Periodic VAT Return and Recapitulative Statement – Monthly Regime |
| Withholding Tax (IRS/IRC) | Until the 20th | Payment of withholding taxes |
| SD | Until the 20th | Submission of the Monthly Stamp Duty Declaration |
| VAT | until 27th | Payment of VAT – Monthly Regime |
| Social Security | Until 31st | Submission of the quarterly declaration for self-employed workers |
| IUC (Single Circulation Tax) | Until 31st | Payment of IUC for vehicles whose registration anniversary falls in October |
| IRS/IRC | Until 31st | Submission of Form 30 (payments to non-residents) |
