Sec. 12-733. Limits on time for making of deficiency assessments.
Sec. 12-733. Limits on time for making of deficiency assessments. (a) Except
as otherwise provided in this chapter, a notice of proposed deficiency assessment shall
be mailed to the taxpayer within three years after the return is filed. No deficiency shall
be assessed or collected with respect to the year for which the return is filed unless the
notice is mailed within the three-year period or the period otherwise fixed. Where, within
the sixty-day period ending on the day on which the time prescribed by this chapter for
mailing a notice of proposed deficiency assessment for any taxable year would otherwise
expire, the commissioner receives a written document signed by a taxpayer showing
that the taxpayer owes an additional amount of tax for such taxable year, the period
during which a notice of proposed deficiency assessment may be mailed shall not expire
before the day sixty days after the day on which the commissioner receives such document.
(b) (1) If the taxpayer omits from Connecticut adjusted gross income, in the case
of an individual, or from Connecticut taxable income, in the case of a trust or estate, an
amount properly includable therein which is in excess of twenty-five per cent of the
amount of Connecticut adjusted gross income or Connecticut taxable income, as the
case may be, stated in the return, a notice of a proposed deficiency assessment may be
mailed to the taxpayer within six years after the return is filed. For purposes of this
subsection, there shall not be taken into account any amount which is omitted in the
return if such amount is disclosed in the return, or in a statement attached to the return,
in a manner adequate to apprise the Commissioner of Revenue Services of the nature
and the amount of such item.
(2) If the taxpayer omits from the Connecticut adjusted gross income derived from
or connected with sources within this state, in the case of a nonresident individual or
part-year resident individual, or from Connecticut taxable income derived from or connected with sources within this state, in the case of a nonresident trust or estate of part-year resident trust, an amount properly includable therein which is in excess of twenty-five per cent of the amount of Connecticut adjusted gross income derived from or connected with sources within this state or Connecticut taxable income derived from or
connected with sources within this state, as the case may be, stated in the return, a notice
of a proposed deficiency assessment may be mailed to the taxpayer within six years
after the return is filed. For purposes of this subsection, there shall not be taken into
account any amount which is omitted in the return if such amount is disclosed in the
return, or in a statement attached to the return, in a manner adequate to apprise the
Commissioner of Revenue Services of the nature and the amount of such item.
(c) (1) If no return is filed or if a taxpayer makes, wilfully or otherwise, a false or
fraudulent return, a notice of deficiency assessment may be mailed to the taxpayer at
any time.
(2) If a taxpayer wilfully attempts in any manner to defeat or evade a tax imposed
by this chapter, a notice of deficiency assessment may be mailed to the taxpayer at
any time.
(3) If a taxpayer fails to disclose a listed transaction, as defined in Section 6707A
of the Internal Revenue Code, on the taxpayer's federal tax return, a notice of deficiency
assessment may be mailed to the taxpayer at any time not later than six years after the
return required under this chapter for the same taxable year was filed.
(d) (1) If a taxpayer fails to comply with the requirements of section 12-727 by not
reporting a change or correction by the United States Internal Revenue Service or other
competent authority increasing, in the case of an individual, the individual's federal
adjusted gross income or, in the case of a trust or estate, its federal taxable income, or
by not reporting a change or correction which is treated in the same manner as if it were
a deficiency for federal income tax purposes, or by not filing an amended return, a notice
of a proposed deficiency assessment may be mailed to the taxpayer at any time. The
provisions of this subdivision shall also apply if an individual's computation of tax
under Section 1341(a)(4) or (5) of the Internal Revenue Code is changed or corrected
by the United States Internal Revenue Service or other competent authority, and the
individual fails to comply with the requirements of section 12-727.
(2) If a taxpayer fails to comply with the requirements of subsection (b) of section
12-704 by not reporting a change or correction by tax officers or other competent authority of another jurisdiction affecting the amount of tax of such other jurisdiction that the
taxpayer is finally required to pay, or by not filing an amended return, a notice of a
proposed deficiency assessment may be mailed to the taxpayer at any time.
(e) (1) If the taxpayer, pursuant to section 12-727, reports a change or correction
by the United States Internal Revenue Service or other competent authority increasing,
in the case of an individual, the individual's federal adjusted gross income or, in the
case of a trust or estate, its federal taxable income or reports a change or correction
which is treated in the same manner as if it were a deficiency for federal income tax
purposes, or files an amended return, the assessment, if not deemed to have been made
upon the filing of the report or amended return, may be made at any time not later than
three years after such report or amended return is filed. The provisions of this subdivision
shall also apply if an individual's computation of tax under Section 1341(a)(4) or (5)
of the Internal Revenue Code is changed or corrected by the United States Internal
Revenue Service or other competent authority, and the individual, pursuant to section
12-727, reports the change or correction.
(2) If the taxpayer, pursuant to subsection (b) of section 12-704, reports a change
or correction by tax officers or other competent authority of another jurisdiction affecting
the amount of tax of such other jurisdiction that the taxpayer is finally required to pay,
or files an amended return, the assessment, if not deemed to have been made upon the
filing of the report or amended return, may be made not later than three years after such
report or amended return is filed.
(f) Where, before the expiration of the time prescribed in this section for the assessment of a deficiency, both the commissioner and the taxpayer shall have consented in
writing to its assessment after such time, the deficiency may be assessed at any time
prior to the expiration of the period agreed upon. The period so agreed upon may be
extended by a subsequent agreement in writing made before the expiration of the period
previously agreed upon and the commissioner may, in such a case, waive the statute of
limitations against a claim for refund by such taxpayer.
(g) For purposes of this section an income tax return filed before the last day prescribed by law or by any regulation adopted pursuant to law for the filing thereof, determined without regard to any extension of time for filing, shall be deemed to be filed on
such last day. If a return of withholding tax for any period ending with or within a
calendar year is filed before April fifteenth of the succeeding calendar year, such return
shall be deemed to be filed on April fifteenth of such succeeding calendar year.
(June Sp. Sess. P.A. 91-3, S. 84, 168; May Sp. Sess. P.A. 92-5, S. 23, 37; P.A. 95-5, S. 5, 6; P.A. 97-243, S. 43, 67;
P.A. 98-244, S. 33, 35; P.A. 99-121, S. 25, 28; P.A. 00-174, S. 44, 83; P.A. 02-103, S. 38, 39; P.A. 05-116, S. 4.)
History: June Sp. Sess. P.A. 91-3, S. 84, effective August 22, 1991, and applicable to taxable years of taxpayers
commencing on or after January 1, 1991; May Sp. Sess. P.A. 92-5 amended Subsec. (f) to make a technical change, effective
June 19, 1992, and applicable to taxable years of taxpayers commencing on or after January 1, 1992; P.A. 95-5 amended
Subsec. (a) to allow 60 days for mailing a deficiency assessment notice after an amended tax return is filed, effective April
13, 1995, and applicable to taxable years commencing on or after January 1, 1995; P.A. 97-243 amended Subsec. (b) to
add "Connecticut adjusted" before "gross income" and "Connecticut taxable income in the case of a trust or estate",
effective June 24, 1997, and applicable to taxable years commencing on or after January 1, 1997; P.A. 98-244 amended
Subsec. (b) to number existing text as Subdiv. (1) and added Subdiv. (2) re nonresident and part-year resident individuals,
effective June 8, 1998, and applicable to taxable years commencing on or after January 1, 1998; P.A. 99-121 amended
Subsecs. (d) and (e) to allow commissioner to make an assessment at any time where a taxpayer's federal adjusted gross
income is changed or corrected by the IRS, whether or not the taxpayer's federal taxable income increases, if the taxpayer
does not file an amended Connecticut income tax return, and to make technical changes, effective June 3, 1999; P.A. 00-174 amended Subsec. (c) to allow an assessment to be mailed at any time in the case of a false or fraudulent return, without
regard to taxpayer's intent, amended Subsecs. (d) and (e) to allow a proposed assessment to be sent where computation
of tax is changed or corrected by the Internal Revenue Service and amended Subsec. (g) to provide that determination of
when return is deemed filed for purposes of section is without regard to any extension of time for filing, effective May 26,
2000, and applicable to returns for taxable years commencing on or after January 1, 1999; P.A. 02-103 made technical
changes in Subsecs. (d)(1) and (e)(1); P.A. 05-116 amended Subsec. (c) by designating existing provisions as Subdiv. (1),
inserting "assessment" therein, and adding Subdivs. (2) and (3) re limits on time for deficiency assessments where taxpayer
attempted to defeat or evade tax or failed to disclose a listed transaction, effective June 24, 2005, and applicable to taxable
years commencing on or after January 1, 2005.