Chile’s Tax Authority (Servicio de Impuestos Internos – SII) has issued Resolution Ex. SII No. 123-2025 on 25 September 2025, announcing the official filing schedule for annual tax return forms due in fiscal year (FY) 2026.
Annual tax deadlines for FY 2026
| Form(s) | Deadline |
| 1959 | 30 January |
| 1811, 1822, 1834, 1891, 1900, 1902, 1903 | 3 March |
| 1896, 1898, 1957 | 9 March |
| 1870, 1871, 1873, 1890, 1948 (public companies) | 16 March |
| 1922 (public, private, mutual funds administrator companies) | 20 March |
| 1812, 1832, 1862, 1895, 1897, 1899, 1904, 1909, 1914, 1919, 1932, 1949, 1955 | 23 March |
| 1828, 1835, 1874, 1889, 1894, 1948 (corporate shareholders) | 24 March |
| 1829, 1840, 1841, 1843, 1879, 1887, 1933, 1944, 1953, 1956, 1943, 1947, 1948 (individual shareholders) | 27 March |
| 1922 (banks, stockbrokers, intermediaries) | 30 March |
| 1962 | 5 May |
| 1837 | 15 May |
| 1947, 1948 (individual entrepreneurs) | With Form 22 |
| 1847, 1866, 1867, 1907, 1913, 1926, 1929, 1930, 1937, 1945, 1946, 1950, 1951, 1952, 1958, 1960, 1961, 1963, 1964 | 30 June |
| 1959 | 31 July |
Earlier, SII issued Resolution Ex. SII 87-2024 regarding the updates made in tax Form No. 1943 and certificates Nos. 57 and Nos. 58.
