(b) Requirements of election. An election under subsection (a) of this section shall be made on such form and in such manner as the tax commission may prescribe by regulation or instruction.

(1) When made. An election under subsection (a) of this section may be made at any time during the preceding taxable year of the corporation or at any time during the taxable year of the corporation and on or before the fifteenth day of the third month of such taxable year.

(2) Certain elections made during first two and one-half months. If an election made under subsection (a) of this section is made for any taxable year of the corporation during such year and on or before the fifteenth day of the third month of such year, such election shall be treated as made for the following taxable year if

(A) on one or more days in such taxable year before the day on which the election was made the corporation did not meet the requirements of subsection (b) of section thirteen hundred sixty-one of the internal revenue code or

(B) one or more of the shareholders who held stock in the corporation during such taxable year and before the election was made did not consent to the election.

(3) Elections made after first two and one-half months. If an election under subsection (a) of this section is made for any taxable year of the corporation and such election is made after the fifteenth day of the third month of such taxable year and on or before the fifteenth day of the third month of the following taxable year, such election shall be treated as made for the following taxable year.

(4) Taxable years of two and one-half months or less. For purposes of this subsection, an election for a taxable year made not later than two months and fifteen days after the first day of the taxable year shall be treated as timely made during such year.

(5) Authority to treat late elections, etc., as timely. If (A) an election under subsection (a) of this section is made for any taxable year (determined without regard to paragraph three of this subsection) after the date prescribed by this subsection for making such election for such taxable year, or if no such election is made for any taxable year, and

(B) the commissioner determines that there was reasonable cause for failure to timely make such election, then

(C) the commissioner may treat such an election as timely made for such taxable year (and paragraph three of this subsection shall not apply).

(6) Years for which effective. An election under subsection (a) of this section shall be effective for the taxable year of the corporation for which it is made and for all succeeding taxable years of the corporation until such election is terminated under subsection (c) of this section.

(c) Termination. An election under subsection (a) of this section shall cease to be effective

(1) on the day an election to be an S corporation ceases to be effective for federal income tax purposes pursuant to subsection (d) of section thirteen hundred sixty-two of the internal revenue code, or

(2) if shareholders holding more than one-half of the shares of stock of the corporation on the day on which the revocation is made revoke such election in the manner the tax commission may prescribe by regulation,

(A) on the first day of the taxable year of the corporation, if the revocation is made during such taxable year and on or before the fifteenth day of the third month thereof, or

(B) on the first day of the following taxable year of the corporation, if the revocation is made during the taxable year but after the fifteenth day of the third month thereof, or

(C) on and after the date so specified, if the revocation specifies a date for revocation which is on or after the day on which the revocation is made, or

(3) if any person who was not a shareholder of the corporation on the day on which the election is made becomes a shareholder in the corporation and affirmatively refuses to consent to such election in the manner the tax commission may prescribe by regulation, on the day such person becomes a shareholder.

(d) New York S termination year. In the case of a New York S termination year, the amount of any item of S corporation income, loss and deduction and reductions for taxes (as described in paragraphs two and three of subsection (f) of section thirteen hundred sixty-six of the internal revenue code) required to be taken account of under this article shall be adjusted in the same manner that the S corporation's items which are included in the shareholder's federal adjusted gross income are adjusted under subsection (s) of section six hundred twelve.

(e) Inadvertent invalid elections. If (1) an election under subsection (a) of this section was not effective for the taxable year for which made (determined without regard to paragraph two of subsection (b) of this section) by reason of a failure to obtain shareholder consents,

(2) the commissioner determines that the circumstances resulting in such ineffectiveness were inadvertent,

(3) no later than a reasonable period of time after discovery of the circumstances resulting in such ineffectiveness, steps were taken to acquire the required shareholder consents, and

(4) the corporation, and each person who was a shareholder in the corporation at any time during the period specified pursuant to this subsection, agrees to make such adjustments (consistent with the treatment of the corporation as a New York S corporation) as may be required by the commissioner with respect to such period,

(5) then, notwithstanding the circumstances resulting in such ineffectiveness, such corporation shall be treated as a New York S corporation during the period specified by the commissioner.

(f) Validated federal elections. If (1) an election under subsection (a) of this section was made for a taxable year or years of a corporation, which years occur with or within the period for which the federal S election of such corporation has been validated pursuant to the provisions of subsection (f) of section thirteen hundred sixty-two of the internal revenue code, and

(2) the corporation, and each person who was a shareholder in the corporation at any time during such taxable year or years agrees to make such adjustments (consistent with the treatment of the corporation as a New York S corporation) as may be required by the commissioner with respect to such year or years,

(3) then such corporation shall be treated as a New York S corporation during such year or years.

(g) Transitional rule. Any election made under this section (as in effect for taxable years beginning before January first, nineteen hundred eighty-three) shall be treated as an election made under subsection (a) of this section.

(h) Cross reference. For definitions relating to S corporations, see subdivision one-A of section two hundred eight of this chapter.

(i) Mandated New York S corporation election. (1) Notwithstanding the provisions in subsection (a) of this section, in the case of an eligible S corporation for which the election under subsection (a) of this section is not in effect for the current taxable year, the shareholders of an eligible S corporation are deemed to have made that election effective for the eligible S corporation's entire current taxable year, if the eligible S corporation's investment income for the current taxable year is more than fifty percent of its federal gross income for such year. In determining whether an eligible S corporation is deemed to have made that election, the income of a qualified subchapter S subsidiary owned directly or indirectly by the eligible S corporation shall be included with the income of the eligible S corporation.

(2) For the purposes of this subsection, the term "eligible S corporation" has the same definition as in subsection (a) of this section.

(3) For the purposes of this subsection, the term "investment income" means the sum of an eligible S corporation's gross income from interest, dividends, royalties, annuities, rents and gains derived from dealings in property, including the corporation's share of such items from a partnership, estate or trust, to the extent such items would be includable in federal gross income for the taxable year.

(4) Estimated tax payments. When making estimated tax payments required to be made under this chapter in the current tax year, the eligible S corporation and its shareholders may rely on the eligible S corporation's filing status for the prior year. If the eligible S corporation's filing status changes from the prior tax year the corporation or the shareholders, as the case may be, which made the payments shall be entitled to a refund of such estimated tax payments. No additions to tax with respect to any required declarations or payments of estimated tax imposed under this chapter shall be imposed on the corporation or shareholders, whichever is the taxpayer for the current taxable year, if the corporation or the shareholders file such declarations and make such estimated tax payments by January fifteenth of the following calendar year, regardless of whether the taxpayer's tax year is a calendar or a fiscal year.