Colombia's Dirección de Impuestos y Aduanas Nacionales (DIAN) has adjusted the 2026 tax calendar to accommodate a new public holiday [1].
This shift is critical for taxpayers and businesses because the addition of a non-business day alters the official count of working days used to calculate legal deadlines. Failure to adhere to the updated schedule could result in penalties or interest for late filings.
The adjustment follows the creation of a new holiday. While sources differ on the legal instrument used, some reports cite Decreto 500 de 2024 [2], while others point to Ley 2578 de 2026 [1]. The holiday in question is identified as the "Día Cívico de la Paz con la Naturaleza," which fell on Friday, April 17, 2026 [2].
Because the tax calendar relies on a specific number of business days, the introduction of this date shifted various deadlines throughout the year. This includes adjustments to deadlines in July 2026, and the broader window for income tax filings [1].
For natural persons, the filing window for income tax declarations is set from Aug. 12, 2026, to Oct. 26, 2026 [3]. Taxpayers are advised to verify their specific deadlines based on their tax identification numbers to ensure compliance with the revised schedule [4].
The DIAN said the changes ensure that the administrative process remains aligned with the official national calendar. The authority has updated its digital platforms to reflect these new dates, allowing citizens to track their obligations more accurately [1].
“The adjustment responds to a new public holiday that alters the set of business days used to calculate tax-payment deadlines.”
The adjustment highlights how legislative changes to national holidays can have immediate ripple effects on fiscal administration. By shifting the 2026 deadlines, the DIAN is preventing a systemic wave of technical defaults that would occur if taxpayers attempted to file on days when government offices and banking systems are closed.
