Colombia's tax authority will open the income tax filing period for individuals from Aug. 12 [1] to Oct. 26, 2026 [2].

These deadlines are critical for thousands of taxpayers who must determine if they meet the financial thresholds required to file. Failure to adhere to the schedule based on the last two digits of the taxpayer's identification number can lead to financial penalties.

The Dirección de Impuestos y Aduanas Nacionales, known as the DIAN, is managing the process for the 2025 taxable year [3]. The agency requires individuals to file if they exceed specific limits regarding their total assets, annual income, consumption, or bank deposits [4].

Taxpayers are advised to review their financial records to see if they meet these thresholds. The filing window begins on Aug. 12 [1] and concludes on Oct. 26 [2]. This timeline ensures the government can process returns according to the specific identification numbers of the citizens.

While the obligation to file is triggered by meeting these wealth or income caps, the act of filing a return does not always result in a tax payment [4]. Some taxpayers may find that deductions or credits offset their liability, though the reporting requirement remains mandatory for those above the limits.

Citizens are encouraged to use the DIAN's official channels to verify their status and avoid the risk of sanctions. The process remains centered on the 2025 taxable year [3] to ensure all economic activity from that period is properly accounted for in the 2026 calendar.

“The filing window begins on Aug. 12 and concludes on Oct. 26.”

The 2026 filing window represents the formal closing of the 2025 fiscal cycle for Colombian individuals. By tying deadlines to identification numbers, the DIAN prevents system congestion while enforcing strict compliance. For the taxpayer, the distinction between the obligation to declare and the obligation to pay is a key financial nuance that prevents misconceptions about the tax burden.