Worked on the Studio73/l10n-spain repository to ensure compliance with the new BOE 2025 tax format for the l10n_es_aeat_mod303 module. Addressed regulatory changes by forcing ephemeral tax percentages to zero for years beyond 2024 and corrected the placement of the Recargo equivalencia 0.5% tax type, aligning tax data with updated specifications. Focused on configuration and localization tasks, leveraging Python to implement these adjustments. The work improved the reliability of tax reporting for the 2025 filing season and reduced regulatory risk, demonstrating attention to detail in tax compliance and a methodical approach to maintaining localization accuracy.