(1) A declaration of estimated tax under this code shall be filed before the 1st day of the 6th month of each taxable year, except that if the minimum tax requirement of s. 220.24(1) is first met:

(a) After the 3rd month and before the 6th month of the taxable year, the declaration shall be filed before the 1st day of the 7th month;
(b) After the 5th month and before the 9th month of the taxable year, the declaration shall be filed before the 1st day of the 10th month; or
(c) After the 8th month and before the 12th month of the taxable year, the declaration shall be filed for the taxable year before the 1st day of the succeeding taxable year.
(2) Notwithstanding subsection (1), for taxable years beginning before January 1, 2026, taxpayers with a taxable year ending on June 30 shall file declarations before the 1st day of the 5th month of each taxable year, unless paragraph (1)(a), paragraph (1)(b), or paragraph (1)(c) applies.
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