1129.73. Every member of a SIFT partnership that is liable to pay tax under this Part for a taxation year shall—on or before the day, determined in accordance with section 1086R23.3 of the Regulation respecting the Taxation Act (R.R.Q., 1981, c. I-3, r. 1), on which the partnership return provided for in section 1086R23.1 of that Regulation is required to be filed for the year—file with the Minister a return for the year in the prescribed form containing an estimate of the amount of tax payable by the partnership under this Part for the year.