Single-subject rule
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Single-subject rule

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Single-subject rule

The single-subject rule is a rule in the constitutional law of some jurisdictions that stipulates that some or all types of legislation may deal with only one main issue. One purpose is to avoid complexity in acts, to avoid any hidden provisions that legislators or voters may miss when reading the proposed law. Another is to prevent legislators attaching an unpopular provision ("rider") to an unrelated popular one, whether in the hope of sneaking the unpopular one through, or in the hope of causing the popular one to be rejected (a type of wrecking amendment). It also prevents log-rolling, whereby legislators trade votes with others to get them to vote for both bills.

In English law, the long title of a bill or act of parliament states its purpose; this may enumerate multiple purposes, or end with a vague formula like "and for other purposes". A proposed amendment to a bill may be rejected if it is outside the scope defined in its long title; alternatively, the title may be amended to increase its scope. An omnibus bill covers a number of diverse or unrelated topics.

Section 55 of the Constitution of Australia provides a single-subject rule for taxation legislation: "Laws imposing taxation shall deal only with the imposition of taxation, and any provision therein dealing with any other matter shall be of no effect". The same section also requires laws imposing taxation to "deal with one subject of taxation only" (except those relating to customs and excise).

The 1937 Constitution of Ireland states that "A Bill containing a proposal or proposals for the amendment of this Constitution shall not contain any other proposal". This was in contrast to the 1922 Constitution of the Irish Free State, which could be implicitly amended.

Section 26(1) of the Constitution of the Philippines states that "Every bill passed by the Congress shall embrace only one subject which shall be expressed in the title thereof."

The Parliamentary Act (Swedish: Riksdagsordningen) states that "proposals on different subjects may not be combined in one motion".

In Swiss law, the "principle of the unity of the subject matter" (German: Grundsatz der Einheit der Materie, French: principe de l'unité de la matière, Italian: principio dell'unità della materia) applies to federal popular initiatives and to parliamentary legislation that is subject to a referendum. It has been derived by the Swiss Federal Supreme Court from the provision in article 34, section 2 of the Swiss Federal Constitution which guarantees "the freedom of the citizen to form an opinion and to give genuine expression to his or her will" in the exercise of political rights. The Court has outlined the principle as follows:

The single subject rule exists in 43 state constitutions in the United States. 41 states apply the rule to all legislation, whereas Mississippi and Arkansas apply it only to appropriations bills.

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