An enabling act is a piece of legislation by which a legislative body grants an entity which depends on it (for authorization or legitimacy) the power to take certain actions. For example, enabling acts often establish government agencies to carry out specific government policies in a modern nation. The effects of enabling acts from different times and places vary widely.
The first enabling act is dated from 4 August 1914 just after the outbreak of World War I. With the vote of the Social Democrats, the Reichstag (the parliament) agreed to give the government certain powers to take the necessary economic measures during the war. Such enabling acts were also common in other countries. The Reichstag had to be informed, and had the right to abolish a decree based on the enabling act. This ensured that the government used its rights with care and only in rare cases was a decree abolished. The parliament retained its right to make law. 
In the Weimar Republic (1919–1933), there were several enabling acts: three in 1919, one in 1920 and one in 1921, three in 1923, one in 1926 and one in 1927. The enabling act on 24 February 1923, originally limited until 1 June but extended until 31 October, empowered the cabinet to resist the Occupation of the Ruhr.  There was an enabling act on 13 October 1923 and an enabling act on 8 December 1923 that would last until the dissolution of the Reichstag on 13 March 1924. 
Most of them had a temporal limit but only vague thematic limits. On the basis of these acts, a vast number of decrees were signed with enormous importance for social and economic life, the judicial system, and taxes. For example, the reform of German currency, the establishment of a single, national railway system and unemployment pay were settled via such decrees (Vollmacht-Verordnungen).  The Emminger Reform of 4 January 1924 abolished the jury as trier of fact and replaced it with a mixed system of judges and lay judges in Germany's judiciary which still exists today.
These enabling acts were unconstitutional, as the Weimar constitution did not provide the possibility that one organ (parliament) would transfer its rights to another one (government). But constitutional experts accepted them because they came into existence with a two-thirds majority, the same majority as for constitutional changes. The government had success in gathering those majorities by threatening to call for presidential emergency dictatorial decrees (usually called Notverordnungen), otherwise. In March 1924, the Reichstag wanted to discuss an abolition of decrees (which was granted by the enabling act of February that year). President Friedrich Ebert dismissed parliament to avoid discussion and abolishments.
In later years, since the radicalization of the nationalist party (DNVP) in 1928 and the rise of the Nazi Party from 1930, governments failed to gather two-thirds majorities. Chancellor Heinrich Brüning (1930–1932) worked with presidential decrees which replaced most of ordinary legislature, eventually.
The enabling acts had set a poor and dangerous example. But for the government, they had the advantage that they appeared less unconstitutional and dictatorial compared to presidential decrees. Parliament could prefer those acts because they were valid only for a limited time and included mostly a kind of cooperation (e.g., via a special house committee).
The German word Ermächtigungsgesetz usually refers to the Enabling Act of 1933, officially Gesetz zur Behebung der Not von Volk und Reich ("Law to Remedy the Distress of the People and the State"). It became a cornerstone of Adolf Hitler's seizure of power. Unlike, for example, the Wilhelm Marx enabling act of December 1923, Hitler's Act:
- was limited to four years, not several months;
- enabled government not only to create decrees, but even laws and treaties with other countries;
- these laws could deviate from the constitution;
- there were no thematic limits;
- neither any house committee nor the Reichsrat (the common organ of the German regional states) had the right to control, or to abolish these laws.
In comparison to the situation of the 1920s, Hitler's Nazi Party and his coalition partner the German National People's Party did have a parliamentary majority since the general elections of 3 March 1933.  Those elections and then the voting in the Reichstag were carried out in a climate of intimidation and violence carried out by Nazi paramilitary groups. On 23 March, the Communists were already banned and imprisoned, the Social Democrat delegates were the only ones present in the Reichstag to vote against, while the Centre and moderate-right parties voted yes in order to prevent "worse".
The Enabling Act of 1933 was renewed by a purely Nazi Reichstag in 1937 and 1939. In 1941 and 1943 it was renewed by decree, in 1943 without temporal limit. Although it states that it is valid only for the duration of the current Hitler government of 1933, it remained in force even after major changes of ministers. In any case, Hitler called the cabinet together only very rarely after the first months of 1933. The last cabinet meeting happened in 1937. He preferred to govern via decrees and personal orders.
In the Federal Republic of Germany, with its 1949 constitution, there have been no enabling acts. The constitution states that it can be changed only by an explicit alteration of the phrasing.
The Church of England Assembly (Powers) Act 1919 gave a considerable degree of self-government to the Church of England while retaining overall parliamentary supervision. Before its passing, almost all adjustments to the legal structure of the Church of England had involved getting a specific bill through Parliament.  It took nine sessions to approve the salary of the Archdeacon of Cornwall,  and of the 217 bills introduced into the House of Commons between 1880 and 1913, only 33 passed into law for lack of parliamentary time, among the casualties being the bills to establish new dioceses. 
The Act gave the newly established Church Assembly, predecessor of the General Synod, power to prepare and present to Parliament measures which could either be approved or rejected, but not modified by either House. Before being voted on, the proposals were examined by an Ecclesiastical Committee of both Houses which reported on their effects and implications. Once approved in Parliament, the measure became law on receiving the royal assent. 
The Act continues to apply today to the General Synod of the Church of England which, as a result of the Synodical Government Measure of 1969, replaced the Church Assembly with the aim of achieving full integration of the laity and eliminating the complications caused by the dual control of the Convocations of Canterbury and of York, and the Assembly. All the Assembly's powers passed to the new synod along with many of those of the Convocations. 
In the 1930s, both Sir Stafford Cripps and Clement Attlee advocated an enabling act to allow a future Labour government to pass socialist legislation which would not be amended by normal parliamentary procedures and the House of Lords. According to Cripps, his "Planning and Enabling Act" would not be able to be repealed, and the orders made by the government using the act would not be allowed discussion in Parliament. Cripps also suggested measures against the monarchy, but quickly dropped the idea. 
In 1966 Oswald Mosley advocated a government of national unity drawn from "the professions, from science, from the unions and the managers, from businessmen, the housewives, from the services, from the universities, and even from the best of the politicians". This coalition would be a "hard centre" oriented one which would also get Parliament to pass an Enabling Act in order to stop what Mosley described as "time-wasting obstructionism of present procedure". He also claimed that Parliament would always retain the power to dismiss his government by vote of censure if its policies failed or if it attempted to "override basic British freedoms". 
This section's factual accuracy may be compromised due to out-of-date information. (August 2016)
In early 2006 the highly controversial yet little-publicised Legislative and Regulatory Reform Bill was introduced to Parliament. This Bill, if enacted as introduced, would have enabled Government ministers to amend or repeal any legislation (including the L&RR Bill itself), subject to vague and highly subjective restraints, by decree and without recourse to Parliament. The Bill was variously described as the Abolition of Parliament Bill  and "of first-class constitutional significance ... [and would] markedly alter the respective and long standing roles of minister and Parliament in the legislative process".  The Bill is, in essence, an Enabling Act in all but name. After some amendment by the government and Lords, the Legislative and Regulatory Reform Bill received Royal Assent on 8 November 2006.  Amendments included removing its ability to modify itself or the Human Rights Act 1998; most of the other modifications were much more subjectively defined.
The European Union (Withdrawal) Bill of 2017, also known as the Great Repeal Bill, has come under fire from critics because it envisions giving the UK Government unprecedented powers to rewrite any aspect of UK laws imported from EU law when Britain leaves the EU, without consulting Parliament. Such powers, effected by clauses called Henry VIII clauses, have been controversially used in the past, but usually only in respect of very limited areas of law.
In the United States, an "enabling act" is a statute enacted by the United States Congress authorizing the people of a territory to frame a proposed state constitution as a step towards admission to the Union. Each act details the mechanism by which the territory will be admitted as a state following ratification of their constitution and election of state officers.
Enabling acts can contain restrictions, such as the prohibition of polygamy in the Utah, Arizona, New Mexico, and Oklahoma acts.  Nevada was required to abolish slavery and involuntary servitude, except as punishment for a crime; to guarantee freedom of religious practice to all inhabitants; and to agree that all public lands owned by the federal government at the time of statehood would be retained after admission.  The applicant territory then submits its proposed constitution to Congress, which either accepts it or requires changes. For example, in 1866, Congress refused the proposed Nebraska constitution because it limited suffrage to white males. Enabling Acts approved by Congress include:
- Enabling Act of 1802, for the formation of Ohio from the Northwest Territory
- Enabling Act of 1864, for the formation of Nevada
- Enabling Act of 1889, for the formation of North Dakota, South Dakota, Montana, and Washington
- Enabling Act of 1894, for the formation of Utah
- Enabling Act of 1906 for the formation of Oklahoma from Oklahoma Territory and Indian Territory
- Enabling Act of 1910, for the admission of Arizona  and New Mexico 
Although the use of an enabling act is a traditional historic practice, a number of territories have drafted constitutions for submission to Congress absent an enabling act and were subsequently admitted, and the act of Congress admitting Kentucky to the Union was passed before the constitution of Kentucky was drafted.
In Venezuela, enabling laws allowing the president to rule by decree in selected matters were granted to Rómulo Betancourt (1959),  Carlos Andrés Pérez (1974),  Jaime Lusinchi (1984),  Ramón José Velásquez (1993)  and Rafael Caldera (1994).  Pérez issued over 3000 decrees under the powers delegated to him. 
In mid-2000 a similar law enabled Hugo Chávez to legislate on issues related to the economy, reorganization of government ministries, and crime for one year. Chávez did not take advantage of this act until shortly before its expiration, when he passed 49 decrees in rapid succession, many of them highly controversial.    In 2007, a new enabling act granted President Chávez powers for 18 months, giving the president the ability to rule by decree over certain economic, social, territorial, defense, and scientific matters as well as control over transportation, regulations for popular participation, and rules for governing state institutions. 
- Turkish constitutional referendum, 2017, which some media outlets have compared to an "enabling act" 
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The constitutional reform in Turkey of 2016 and the conditions under which it is being pushed through recall legal procedures like the Enabling Act 1933 by which the Nazis came to power in Germany in the 1930s. This has been noted by many international and in particular German, Austrian and Swiss media including ‘Die Tagesschau’, ‘Der Standard’ and ‘Neue Zuricher Zeitung’.