43. Are there limits on the amount that third parties can spend on election campaign activities?

No public institution or entity of any kind can donate in kind and cash contributions or aid to political parties. Only trade unions and cooperatives can contribute to political parties. The Constitutional Court annulled the regulation which enabled the associations to support political parties.
Source: Article 66(1), Law on Political Parties, 1983 (amended 2018)

During the ten-day period before the day of voting, broadcasting and all means of distribution under the name of public polls, surveys, forecast, mini referendum through information and communication calls by using the means of print and broadcast media and broadcasting for or against any political party or candidate in a manner to influence the vote of citizens are prohibited under all circumstances.

Source: Article 55B, Law on Basic Provisions of Elections and Voter Registers, 1961 (amended 2018)

The use of public buildings, involving public officials and accepting third party assistance for propaganda activities are prohibited.
Source: Articles 51/A, 57, 63-66, Law on Basic Provisions of Elections and Voter Registers, 1961 (amended 2018)

GRECO’s Third Round Evaluation Report on Turkey on Transparency of Party Funding states that, “while entities collaborating with political parties (e.g. interest groups, political education foundations, trade unions) are under an obligation to keep accountancy records, their books are not in the public domain; it would therefore prove difficult for the public to establish possible links between such entities and political parties,"
Source: GRECO (2009), Third Evaluation Round Report on Turkey on Transparency of Party Funding, Greco Eval III Rep (2009) 5E Theme II, GRECO. Strasbourg.