In cases where the rent amount is determined in Turkish Lira, pursuant to Article 344/1 of the Turkish Code of Obligations, any agreement between the parties regarding the rent amount for the renewed rental period (rent increase rate) is valid provided that it does not exceed the CPI (Consumer Price Index) twelve-month moving average rate.
After 5 years, when a rent adjustment is made, the parties are no longer bound by the CPI increase rate. If the parties reach an agreement, they may set an increase above the CPI twelve-month moving average rate of the previous rental year. However, if the parties cannot agree on the new rent amount, it will be determined by the court through a rent determination lawsuit.
As of 2025, the CPI twelve-month moving average rate for July 2025 announced by TÜİK (Turkish Statistical Institute) is 41.13%. Accordingly, this rate will be taken into account as the legal rent increase rate for residential and commercial properties in August 2025.