Rent increase rate: legal cap based on the 12-month average CPI and how it is calculated
Short answer
According to TurkStat's September 2026 data, the maximum increase for housing and workplace leases renewed in October 2026 is 31.49 percent. The previous month's rate was 31.79 percent.
The legal cap on rent increases is based on the change in the Consumer Price Index (CPI) according to 12-month averages, as published by the Turkish Statistical Institute (TurkStat). With the September 2026 data released on 5 October 2026, the cap for October was settled.
Current rate for October 2026
- October 2026 rent increase rate: 31.49 percent
- Rate for leases renewed in September 2026: 31.79 percent
- September 2026 CPI (monthly): 1.84 percent increase over the previous month
- September 2026 CPI (annual): 29.73 percent
Legal basis and scope
Under Article 344 of the Turkish Code of Obligations, the legal cap is set on the basis of the change in CPI according to 12-month averages. Because the temporary 25 percent cap on housing rents has ended, this rate applies to both housing and workplace leases.
When is the rate announced?
TurkStat releases inflation data on the 3rd of each month at 10:00. Because 3 October 2026 fell on a weekend, the September data was published on Monday, 5 October 2026.
Rent increase rates for the last 12 months
- October 2025: 38.36 percent
- November 2025: 37.15 percent
- December 2025: 35.91 percent
- January 2026: 34.88 percent
- February 2026: 33.98 percent
- March 2026: 33.39 percent
- April 2026: 32.82 percent
- May 2026: 32.43 percent
- June 2026: 32.24 percent
- July 2026: 32.03 percent
- August 2026: 31.90 percent
- September 2026: 31.79 percent
How is it calculated?
- Identify the renewal monthFind the published rate for the month in which the lease is renewed.
- Find the increase amountMultiply the current rent by that month's rate.
- Calculate the new rentAdd the increase amount to the current rent.
Frequently asked questions
What is the October 2026 rent increase rate?
According to TurkStat's September 2026 data, it is 31.49 percent.
What was the rate for leases renewed in September?
31.79 percent.
Does the rate also apply to workplaces?
Yes. Because the temporary 25 percent cap on housing has ended, the same rate applies to housing and workplace leases.
What is the rate based on?
Under Article 344 of the Turkish Code of Obligations, it is based on the change in CPI according to 12-month averages.
Source: TÜİK
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