Turkish rent increase 2026: CPI cap, calculation, and legal framework

The legal framework: TBK art. 344

TBK art. 344/I is clear: 'The parties' agreement on the rent applicable in renewed lease periods is valid provided it does not exceed the rate of change in the 12-month averages of the consumer price index in the prior lease year.' That is, whichever is LOWER applies: the rate stated in the contract or the CPI annual average change rate.

Sub-paragraph two: 'This rule also applies to lease contracts longer than one year.' So even in long-term contracts, the annual escalation cap applies every year.

The CPI-based escalation formula

Calculation has two steps. First, take the CPI 12-month average change rate for the lease year from TurkStat's official publication. Then apply the formula:

• New rent = Current rent × (1 + CPI annual average change rate / 100)
• Example: current rent 10,000 TRY, CPI annual avg change 48%: 10,000 × 1.48 = 14,800 TRY
• Contract rate 30%, CPI 48%: 10,000 × 1.30 = 13,000 TRY (the lower applies)
• Contract rate 60%, CPI 48%: 10,000 × 1.48 = 14,800 TRY (CPI is the cap)

Concrete example for 2025 and 2026

Suppose a residential rental contract started in June 2025 at 15,000 TRY per month. By June 2026, the annual renewal is due. You then look at the CPI 12-month average change rate for the June 2025 – May 2026 period.

Using a hypothetical figure of 44% (representative): the new rent is 15,000 × 1.44 = 21,600 TRY. If the contract also specifies an escalation rate (say 25%), the lower applies — 15,000 × 1.25 = 18,750 TRY. Even if the lessor demands the CPI rate, the 25% in the contract serves as a ceiling.

If no escalation rate is stated in the contract, the CPI cap applies directly. This is not in the renter's favor — without a lower contractual rate, no brake mechanism kicks in.

Where to find the CPI rate

TurkStat publishes the prior month's inflation data at the start of each month (https://www.tuik.gov.tr). The CPI 12-month average change rate is the ratio of the last 12 months' CPI levels to the prior 12 months' CPI levels — used as the 'annual change' (not the annualized monthly rate).

Practical check: the Turkish Ministry of Justice's UYAP system (https://www.uyap.gov.tr) has a 'rent escalation rate' module that pulls TurkStat data automatically; judges use it. In a dispute, this figure is the reference.

Non-residential (workplace, commercial) rentals

The TBK art. 344 CPI cap applies only to residential and roofed-workplace leases. Open-area rentals (warehouses, parking lots, agricultural land), heavy equipment rentals, vehicle rentals, and service agreements are not subject to the CPI cap. Escalation in these contracts is freely negotiated between the parties; free-market rules apply.

Akitle does this calculation for you

The Akitle real-estate lease template offers the rent-escalation clause with two options: (a) a fixed rate (e.g., 25%), (b) CPI-indexed (matching the annual change rate). When annual renewal is due, the system references TurkStat's most recent CPI 12-month average change rate to compute the new rent. The calculation appears in the audit trail visible to both parties; in case of dispute, the document is on the record.