A taxpayer required to file a declaration of estimated tax pursuant to s. 220.24 shall pay such estimated tax as follows:(1) If the declaration is required to be filed before the 1st day of the 6th month of the taxable year, the estimated tax shall be paid in four equal installments. The first installment shall be paid at the time of the required filing of the declaration; the second and third installments shall be paid before the 1st day of the 7th month and before the 1st day of the 10th month of the taxable year, respectively; and the fourth installment shall be paid before the 1st day of the next taxable year.
(2) If the declaration is required to be filed before the 1st day of the 7th month of the taxable year, the estimated tax shall be paid in three equal installments. The first installment shall be paid at the time of required filing of the declaration; the second installment shall be paid before the 1st day of the 10th month of the taxable year; and the third installment shall be paid before the 1st day of the next taxable year.
(3) If the declaration is required to be filed before the 1st day of the 10th month of the taxable year, the estimated tax shall be paid in two equal installments: at the time of required filing of the declaration for such taxable year and before the 1st day of the next taxable year, respectively.
(4) If the declaration is required to be filed on or before the first day of the succeeding taxable year, the estimated tax shall be paid in full at the time of such required filing.
(5) If the declaration is filed after the time prescribed in s. 220.241 due to the grant of an extension of time for filing, subsections (1)-(4) of this section shall not apply, and there shall be paid at the time of such filing all installments of estimated tax which would have been payable on or before such time if the declaration had been filed within the time prescribed in s. 220.241 and without regard to the extension, and the remaining installments shall be paid at the time at which, and in the amounts in which, they would have been payable if the declaration had been so filed. (6) If an amended declaration is filed, the remaining installments, if any, shall be ratably increased or decreased, as the case may be, to reflect the increase or decrease in the estimated tax occasioned by such amendment.
(7) Notwithstanding any administrative rule or determination of the department which allows estimated payments otherwise due on a Saturday, Sunday, or legal holiday to be paid on the next succeeding day that is not a Saturday, Sunday, or legal holiday, any estimated tax payment required under this section which would otherwise be due on the last Saturday or Sunday of June shall be paid on or before the last Friday of June.
(8) The application of this section to taxable years of less than 12 months shall be in accordance with regulations prescribed by the department.
