Mont. Code Ann. § 1-2-201
(2021)

Statutes – effective date

(1) (a) Except as provided in subsection (1)(b), (1)(c), or (1)(d), every statute adopted after January 1, 1981, takes effect on the first day of October following its passage and approval unless a different time is prescribed in the enacting legislation.

(b) Subject to subsection (1)(d), every statute providing for appropriation by the legislature for public funds for a public purpose takes effect on the first day of July following its passage and approval unless a different time is prescribed in the enacting legislation.

(c) Subject to subsection (1)(d), every statute providing for the taxation of or the imposition of a fee on motor vehicles takes effect on the first day of January following its passage and approval unless a different time is prescribed in the enacting legislation.

(d) Every statute enacted during a special session of the legislature takes effect upon passage and approval unless a different time is prescribed in the enacting legislation.

(2) "Passage", as used in subsection (1), means the enactment into law of a bill, which has passed the legislature, either with or without the approval of the governor, as provided in the constitution.

History:
(1)En. Sec. 3466, C. Civ. Proc. 1895
Re-en. Sec. 8074, Rev. C. 1907
Amd. Sec. 1, Ch. 92, L. 1921
Re-en. Sec. 90, R.C.M. 1921
Cal. Pol. C. Sec. 323
Re-en. Sec. 90, R.C.M. 1935
Sec. 43-507, R.C.M. 1947
(2)En. Sec. 3467, C. Civ. Proc. 1895
Re-en. Sec. 8075, Rev. C. 1907
Re-en. Sec. 91, R.C.M. 1921
Re-en. Sec. 91, R.C.M. 1935
Amd. Sec. 20, Ch. 100, L. 1973
Amd. Sec. 9, Ch. 309, L. 1977
Sec. 43-508, R.C.M. 1947
R.C.M. 1947, 43-507, 43-508
Amd. Sec. 2, Ch. 119, L. 1979
Amd. Sec. 1, Ch. 466, L. 1981
Amd. Sec. 1, Ch. 604, L. 1991
Amd. Sec. 1, Ch. 18, L. 1995
Amd. Sec. 1, Ch. 104, L. 2003 (SB 17 - McGee, Dan (R) SD 11)