Colorado Code § 29-2-205

Notice requirements - effective and applicability dates - definition. [Editor's note: This section is effective July 1, 2025.]
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(1) (a) For the purpose of the
administration by the state of the provisions of this article, as well as any other state or federal
program, each home rule jurisdiction shall file with the executive director a copy of each sales or
use tax ordinance or resolution, or any amendment thereto, no later than forty-five days before
its effective date. The failure to file a copy of any such ordinance or resolution shall not give rise
to any claim for refund by any taxpayer, other than for overpayment which is determined to be
allowable under such ordinance or resolution.
(b) Notwithstanding any law to the contrary, when a statutory local government, special
district, or requesting home rule jurisdiction by ordinance or resolution imposes a new sales or
use tax that the department will collect pursuant to this part 2, or makes any change to its
existing sales or use tax that will affect the department's collection pursuant to this part 2, the
statutory local government, special district, or requesting home rule jurisdiction shall provide the
department with written notice of the ordinance or resolution imposing the new sales or use tax
or changes to the existing sales or use tax imposition along with a copy of the ordinance or
resolution no later than forty-five days before its effective date. The failure to provide written
notice and a copy of the ordinance or resolution does not give rise to any claim for refund by any
taxpayer other than for an overpayment allowed pursuant to the ordinance or resolution.
(c) Notwithstanding any law to the contrary, when a statutory local government, special
district, or requesting home rule jurisdiction by election imposes a sales or use tax that the
department will collect pursuant to this part 2 or makes any change to its existing sales or use tax
that will affect the department's collection pursuant to this part 2, the statutory local government,
special district, or requesting home rule jurisdiction shall provide the department with written
notice of the ordinance or resolution submitting the question to the registered electors at a
general or special election, including a copy of the ordinance or resolution and a copy of the
measure that will appear on the ballot, no later than fourteen days after the adoption of the
ordinance or resolution. The failure to provide written notice, the copy of the ordinance or
resolution, and the copy of the measure that will appear on the ballot does not give rise to any
claim for refund by any taxpayer other than for an overpayment allowed pursuant to the
ordinance or resolution.
(2) Except as provided in subsection (4) of this section, the applicability of any new
sales or use tax or any change to an existing sales or use tax imposed by a statutory local
government, special district, or requesting home rule jurisdiction shall be either January 1 or July
1 following the date of enactment of the ordinance or resolution, or either January 1 or July 1
following the date of the election in which the sales or use tax proposal or change is approved. If
the department does not receive the written notice by the deadlines described in subsection (1)(b)
and (1)(c) of this section, the sales or use tax proposal or change shall not apply until the next
succeeding January 1 or July 1 that is at least forty-five days after the department receives the
written notice.
(3) For purposes of this section, "change" means:
(a) A change to the sales or use tax base, the adoption of a new sales or use tax
exemption, the amendment or repeal of an existing sales or use tax exemption, or, for a statutory
local government or requesting home rule jurisdiction, the express inclusion of any of the
exemptions listed in section 29-2-105 (1)(d)(I);
(b) The expiration of an existing sales or use tax or sales or use tax exemption;
(c) A change to the sales or use tax rate;
(d) A change to the geographic boundary of the statutory local government, special
district, or requesting home rule jurisdiction, including both new or amended boundaries;
(e) A statutory local government's transition to a self-collecting home rule jurisdiction;
(f) A requesting home rule jurisdiction's transition to a self-collecting home rule
jurisdiction;
(g) A self-collecting home rule jurisdiction's transition to a requesting home rule
jurisdiction;
(h) A change in the statutory local government's, requesting home rule jurisdiction's, or
special district's distribution formula;
(i) The imposition of a vendor fee or the amendment to an existing vendor fee allowed
pursuant to section 29-2-206; or
(j) Any other change that will affect the collection, administration, enforcement, or
distribution of sales or use tax pursuant to this part 2 or as described in rules promulgated by the
department pursuant to section 29-2-216.
(4) (a) For purposes of this part 2, the applicability of a sales or use tax imposed as a
result of a change to a statutory local government's geographic boundary is determined pursuant
to section 30-6-109.7 and part 12 of article 31 of title 31.
(b) (I) A special district or requesting home rule jurisdiction that changes its boundaries
through use of its annexation authority shall file a copy of the annexation map and a copy of the
annexation ordinance or resolution with the department in the form and manner required by the
department.
(II) The special district or requesting home rule jurisdiction's sales or use tax in the
annexed area applies beginning on the next January 1 or July 1 following the department's
receipt of the annexation map and annexation ordinance or resolution so long as the annexation
map and annexation resolution are received by the department no later than forty-five days
before the January 1 or July 1. If the annexation map and annexation resolution are not received
by the department as specified in this subsection (4)(b)(II), then the sales or use tax in the
annexed area does not apply until the next succeeding January 1 or July 1.
(c) Upon receiving an annexation ordinance and map pursuant to subsection (4) of this
section, the department shall communicate with any taxing entities affected by the annexation in
order to facilitate the administration and collection of sales or use tax in the annexed area and to
identify all retailers affected by the annexation. The department shall make copies of the
annexation map and annexation resolution available to all taxing entities in the state.

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