Conn. Gen. Stat. § 9-712

(2) Each such treasurer shall file weekly supplemental campaign finance statements with the commission pursuant to the following schedule: (A) In the case of a primary campaign, on the second Thursday following the date in July on which treasurers are required to file campaign finance statements pursuant to subparagraph (A) of subdivision (1) of subsection (a) of section 9-608 and each Thursday thereafter up to and including the Thursday before the day of the primary, and (B) in the case of a general election campaign, on the second Thursday following the date in October on which candidates are required to file campaign finance statements pursuant to subparagraph (A) of subdivision (1) of subsection (a) of section 9-608 and each Thursday thereafter up to and including the Thursday before the day of the election. The statement shall be complete as of eleven fifty-nine o'clock p.m. of the second day immediately preceding the required filing day. The statement shall cover the period beginning with the first day not included in the last filed statement.

(3) Notwithstanding the provisions of subdivisions (1) and (2) of this subsection, if a participating candidate committee in a primary campaign or a general election campaign in which there is at least one participating candidate makes expenditures or incurs an obligation to make expenditures that, in the aggregate, exceed one hundred per cent of the applicable expenditure limit for the applicable primary or general election campaign period, the treasurer of any such candidate committee shall file a declaration of excess expenditures statement with the commission, pursuant to the following schedule: (A) If a candidate committee makes expenditures or incurs an obligation to make such expenditures more than twenty days before the day of such primary or election, the treasurer of such candidate shall file such statement with the commission not later than forty-eight hours after making such expenditures or incurring an obligation to make such expenditures, and (B) if a candidate committee makes such expenditures or incurs an obligation to make such expenditures twenty days or less before the day of such primary or election, the treasurer of such candidate shall file such statement with the commission not later than twenty-four hours after making such expenditures or incurring an obligation to make such expenditures. The statement shall be complete as of eleven fifty-nine o'clock p.m. of the first day immediately preceding the required filing day. The statement shall cover a period beginning with the first day not included in the last filed statement.

(4) Notwithstanding the provisions of this subsection, the statements required to be filed pursuant to subdivisions (1) and (2) of this subsection shall not be required to be filed by (A) a candidate committee of a candidate that is exempt from filing campaign finance statements pursuant to subsection (b) of section 9-608 unless or until such a candidate committee receives or expends an amount in excess of one thousand dollars for purposes of the primary or election for which such committee was formed, (B) a candidate committee of a candidate who is no longer eligible for a position on the ballot, or (C) a candidate committee of a participating candidate that is unopposed, except that such candidate committee shall file a supplemental statement on the last Thursday before the applicable primary or general election. Such statement shall be complete as of eleven fifty-nine o'clock p.m. of the second day immediately preceding the required filing day. The statement shall cover a period beginning with the first day not included in the last filed statement.
is unopposed, except that such candidate committee shall file a supplemental statement on the last Thursday before the applicable primary or general election. Such statement shall be complete as of eleven fifty-nine o'clock p.m. of the second day immediately preceding the required filing day. The statement shall cover a period beginning with the first day not included in the last filed statement.

(5) Each supplemental statement required under subdivision (1), (2) or (3) of this subsection for a candidate shall disclose the information required under subsection (c) of section 9-608 . The commission shall adopt regulations, in accordance with the provisions of chapter 54, specifying permissible media for the transmission of such statements to the commission, which shall include electronic filing.

(b) (1) As used in this section, “excess expenditure” means an expenditure made, or obligated to be made, by a nonparticipating or a participating candidate who is opposed by one or more other participating candidates in a primary campaign or a general election campaign, which is in excess of the amount of the applicable limit on expenditures for said participating candidates for said campaign and which is the sum of (A) the applicable qualifying contributions that the participating candidate is required to receive under section 9-704 to be eligible for grants from the Citizens' Election Fund, and (B) one hundred per cent of the applicable full grant amount for a major party candidate authorized under section 9-705 for the applicable campaign period.

(2) The commission shall confirm whether an expenditure described in a declaration filed under this subsection is an excess expenditure.

(c) If a treasurer fails to file any statement or declaration required by this section within the time required, said treasurer shall be subject to a civil penalty, imposed by the commission, of not more than one thousand dollars for the first failure to file the statement within the time required and not more than five thousand dollars for any subsequent such failure.