The 550-member Parliament carries out legislative functions. Election is by the D'Hondt system of party-list proportional representation. To participate in the distribution of seats, a party must obtain at least 10% of the votes cast at the national level as well as a percentage of votes in the contested district according to a complex formula. The president enacts laws passed by Parliament within 15 days. With the exception of budgetary laws, the president may return a law to the Parliament for reconsideration. If Parliament reenacts the law, it is binding, although the president may then apply to the Constitutional Court for a reversal of the law. Constitutional amendments pass with a 60% vote, but require a popular referendum unless passed with a two-thirds majority; the president may also submit amendments passed with a two-thirds majority to a popular referendum.

The judiciary is declared to be independent, but the need for judicial reform and confirmation of its independence are subjects of open debate. Internationally recognized human rights, including freedom of thought, expression, assembly, and travel, are officially enshrined in the Constitution but have at times been narrowly interpreted, can be limited in times of emergency and cannot be used to violate what the Constitution and the courts consider the integrity of the state or to impose a system of government based on religion, ethnicity, or the domination of one social class. The Constitution prohibits torture or ill treatment; the current government has focused on ensuring that practice matches principle. Labor rights, including the right to strike, are recognized in the Constitution but can be restricted.

The high court system includes a Constitutional Court responsible for judicial review of legislation, a Court of Cassation (or Supreme Court of Appeals), a Council of State serving as the high administrative and appeals court, a Court of Accounts, and a Military Court of Appeals. The High Council of Judges and Prosecutors, appointed by the president, supervises the judiciary.

In the November 2002 election of Turkey's 58th government, the Justice and Development Party (AKP) captured 34.3% of the total votes, making Abdullah Gul Prime Minister, followed by the Republican People's Party (CHP) with 19.39% of the vote, led by Deniz Baykal. A special General Election was held again in the province of Siirt in March 2003, resulting in the election of AKP's chairman Recep Tayyip Erdogan to a seat in Parliament, allowing him to become prime minister. AKP and CHP were the only parties to surpass the 10% threshold required to hold seats in Parliament. The elections resulted in 363 of the 550 seats going to AKP, 178 seats to CHP, and 9 as independent. Due to a reshuffle in party affiliation and resignations, by 2007, AKP held 353 seats, CHP held 151 seats, Anavatan Party held 20 seats, independents held 10 seats, and five joined the True Path Party (DYP). In March 2004 nationwide local elections, AKP won 57 of 81 provincial capital municipalities and, with 41.8% of the votes for provincial council seats, consolidated its hold on power.

The Turkish Grand National Assembly was to have elected in May 2007 a new president to succeed President Sezer, whose term ended on May 16. Opposition parties led a Constitutional Court challenge to the electoral procedures, which resulted in a series of proposed constitutional amendments and early general elections on July 22. AKP won 46.6% of the vote, followed by CHP (20.9%), MHP (14.3%) and independents (5.2%). The new Parliament, which was sworn in on August 4, 2007 included 341 AKP members, 97 CHP members, 71 Nationalist Movement Party (MHP) members, 20 Democratic Society Party (DTP) members, 13 Democratic Left Party (DSP) members, one Freedom and Democracy Party (ODP) member, one Grand Unity Party (BBP) member, and five independents. Following the election, Sezer reappointed Erdogan as Prime Minister and then-Foreign Minister Gul again declared his presidential candidacy. The Parliament elected Gul in the third round of voting on August 28, 2007. Following Gul's move to the presidency, AKP seats in Parliament total 340; an MHP deputy died in August 2007, bringing the number of MHP members to 70; and the ban on a DTP deputy expired in July 2008, raising the number of DTP members to 21. President Gul approved Erdogan's proposed cabinet on August 29, 2007, and the new government received a vote of confidence on September 5. Nationwide local elections for municipal assembly and mayoral positions are scheduled for March 29, 2009.

In March 2008 the Constitutional Court agreed to hear a case to close down the AKP because of alleged "anti-secular" activities that contravene the Turkish Constitution. Seventy-one AKP members, including President Gul and Prime Minister Erdogan, were named in the case and could have been barred from politics for five years. On July 30, 2008 the court voted six in favor and five against closing down AKP; seven votes were required to close down the party. The court decided to cut the party's state funding, worth about $58 million, in half. None of the AKP members were banned.