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In order to operate as autónomo and pay business-related taxes in Spain, you need a Spanish bank account that supports direct debit. Namely, the applicable taxes are automatically paid via direct debit from your personal account to the Spanish authorities, as long as there are sufficient funds available on your bank account to cover the tax bill.

VAT and IRPF taxes (when applicable) are reported and paid on a quarterly basis (April, July, October, January), Social Security fee is paid once a month (there is no tax reporting requirement).

You can see the calendar here