Calculators
Rent Increase Calculator
For residential and roofed workplace leases, the annual increase may not exceed the twelve-month average CPI change of the preceding rental year (Article 344 of the Code of Obligations).
This amount is an upper limit; the parties may agree on a lower increase. If the contract sets a rate below CPI, that rate applies. Where a tenancy has lasted more than five years, the judge may reset the rent to the market level (Code of Obligations, Art. 344/3).
How Is the CPI Average Applied?
The rent increase cap is the twelve-month average change in the consumer price index published monthly by TÜİK, measured over the preceding rental year (Article 344 of the Code of Obligations). Even if the parties agreed on a higher rate in the contract, the portion exceeding this cap is invalid and cannot be claimed from the tenant.
Rent Determination Action
If the landlord wants to demand an increase above the CPI average, a unilateral notice is not enough — a rent determination action must be filed asking the court to set the new rent. After the fifth year of the lease, the court may also take into account the property's condition and comparable rents in addition to the CPI average (Article 345).
Does the CPI Cap Apply to a New Tenant's Contract?
The CPI cap applies only to the annual increase within an ongoing tenancy. Once the property is vacated, the parties to a new lease with a new tenant may agree on the rent freely; the cap under Article 344 does not apply to this first-time figure. The cap only comes into play once that new lease itself continues, for the increases in subsequent years.
Non-Payment of Rent and the Risk of Eviction
A landlord may bring general enforcement proceedings against a tenant who fails to pay the new rent, whether set by the court or calculated from the CPI average. If the tenant has been sent two justified warnings for non-payment of rent within a single rental year, the landlord may also bring an eviction action on that ground (Article 352).
Caps Applied to Rent Increases
| Period | Cap |
|---|---|
| First 5 years of the lease | 12-month CPI average of the preceding rental year (Art. 344) |
| After year 5 | CPI average + market value set by the court (Art. 345) |
| In case of dispute | A rent determination action must be filed — unilateral notice is not sufficient |
Sample Rent Increase by CPI Average
| Current Rent | CPI Average | Increase Amount | New Rent |
|---|---|---|---|
| 15,000 TL | 40% | 6,000 TL | 21,000 TL |
| 25,000 TL | 35% | 8,750 TL | 33,750 TL |
| 40,000 TL | 30% | 12,000 TL | 52,000 TL |
Source Legislation
The links below go to the official, current text of the law on the Turkish Presidency's Legislation Information System.
Last updated: September 11, 2026
Frequently Asked Questions
Who determines the rent increase rate?
TÜİK publishes the consumer price index monthly; the increase cap is the twelve-month average CPI change of the preceding rental year (Article 344).
Can the landlord demand more than the CPI cap?
No, for residential and roofed workplace leases; any contractual rate above the CPI average is invalid for the excess.
Is there a different rule after five years of tenancy?
Yes; after five years the judge may also consider market value alongside the CPI average when setting the new rent.
What if the contract doesn't specify an increase rate?
The CPI average still applies by default; silence in the contract does not bar an increase.
Does the CPI cap apply to a new tenant's contract?
No; the CPI cap applies only to the annual increase within an ongoing tenancy. Parties to a new lease with a new tenant may agree on the rent freely.
What can be done about a tenant who does not pay the new rent?
The landlord may bring general enforcement proceedings; if two justified warnings for non-payment were sent within one rental year, an eviction action may also be brought (Article 352).
Does rent decrease if the CPI figure is negative?
In practice the CPI average has always been positive to date; whether rent could be reduced if the figure turned negative is a case-specific question requiring separate assessment.
Can a fixed increase rate be agreed for several years in advance?
No; the increase for each rental year is set separately, based on that year's CPI average. Even a fixed rate agreed in advance is invalid for any portion exceeding the CPI average.