Rent Increase Rate and Determination Lawsuit in Turkey

Introduction: The Rent Increase Challenge

High inflation in Turkey has made rent increases one of the most contentious issues in landlord-tenant relations. Landlords seek market rates while tenants need protection from unaffordable increases. The Turkish Code of Obligations (TCO) establishes a balanced framework addressing both interests.

Understanding the legal limits, lawsuit options, and procedural requirements is essential for both parties.

Legal Rent Increase Limits

The CPI Cap (Article 344)

The primary limit on annual rent increases is the 12-Month Average Consumer Price Index (TÜFE):

Year	Rate Source	Notes
2019-2024	CPI or 25% cap	Temporary cap due to high inflation
Current (2026)	12-Month Average CPI only	25% cap removed

How CPI Limit Works

1. The rent increase cannot exceed the 12-month average CPI announced by TÜİK (Turkish Statistical Institute)
2. The relevant rate is the CPI announced for the month before the renewal date
3. Applies to both residential and commercial leases

Application of the Limit

Contractual Rate Below CPI:

• If the lease specifies an increase rate below CPI, that rate applies
• The tenant benefits from the lower contractual rate

Contractual Rate Above CPI:

• The increase is automatically reduced to the CPI limit
• The excess portion is unenforceable

No Rate Specified:

• CPI limit applies by default
• Parties should negotiate within this framework

The 25% Cap History

From November 2022 to July 2024, a temporary 25% maximum cap applied due to extreme inflation:

• Protected tenants from sudden, massive increases
• Applied regardless of actual CPI
• Criticized by landlords as unfair

Current Status: The 25% cap has been removed. Only the CPI limit now applies.

Rent Determination Lawsuit (Kira Tespit Davası)

When Available

After the tenant has been in the property for 5 full years (initial term plus renewals), the landlord can file a Rent Determination Lawsuit to adjust rent to market value.

Why File This Lawsuit?

• The CPI increase may not reflect actual market rental values
• After 5 years, rents can fall significantly below market
• The law allows adjustment to fair market value

How It Works

1. Filing: Landlord files lawsuit in Civil Court of Peace (Sulh Hukuk)
2. Expert Appointment: Court appoints a real estate expert
3. Market Analysis: Expert determines fair market value (rayiç)
4. Court Decision: Judge sets new rent, typically with equity reduction (10-20% below expert valuation)

Key Points

• CPI limit does not apply to court-determined rent
• The new rent applies from the lawsuit filing date (if properly notified)
• Mandatory mediation required before filing (since September 2023)
• The determined rent remains subject to CPI increases in subsequent years

Filing Deadline

• File within one month before the contract renewal date, or
• File at least 30 days before renewal and notify the tenant

If filed late, the new rent applies from the following year.

Rent Adaptation Lawsuit (Uyarlama Davası)

Extraordinary Circumstances

Even before 5 years, either party can seek rent adjustment if extraordinary circumstances fundamentally change the balance of the contract.

Conditions (Very Strict)

1. Extraordinary event: Economic crisis, extreme devaluation, natural disaster
2. Unforeseen: Could not have been anticipated at contract signing
3. Fundamental imbalance: The contract has become impossibly burdensome
4. Not caused by the party: The requesting party didn’t cause the circumstance

Practical Reality

Courts are very reluctant to grant adaptation claims:

• Economic fluctuations are considered foreseeable in Turkey
• Both parties assumed market risk
• Granted only in truly exceptional circumstances

Alternative: Renegotiation

Before suing, consider:

• Good faith negotiation with the other party
• Mediation to reach voluntary agreement
• Compromise on a middle-ground rate

Mediation Requirement (Since 2023)

Mandatory for Rent Cases

As of September 1, 2023, mandatory mediation applies before filing:

• Rent determination lawsuits
• Rent adaptation lawsuits
• Eviction lawsuits

Process

1. Apply to Mediation Bureau at courthouse
2. Assigned mediator calls both parties
3. Maximum 4-week process
4. If agreement: Has force of court judgment
5. If no agreement: Proceed to lawsuit with disagreement report

Practical Scenarios

Scenario 1: Normal Annual Increase

The lease renews on July 1, 2025. The May 2025 12-month average CPI is 45%.

• Maximum increase: 45%
• If lease says 30%, only 30% applies
• If lease says 50%, limited to 45%

Scenario 2: After 5 Years

Tenant has been in the property since 2019 (6+ years). Rent is 8,000 TL/month. Market rate is 25,000 TL/month.

• Landlord files rent determination lawsuit
• Expert confirms market rate of 25,000 TL
• Court may set 22,000-23,000 TL (10-15% equity reduction)

Scenario 3: Landlord Demands Triple Rent

Landlord says “Pay 30,000 TL or leave.” Current rent is 10,000 TL. CPI is 40%.

• Tenant pays only 14,000 TL (CPI increase)
• Landlord cannot evict for refusing illegal increase
• Landlord needs just cause to evict

Tenant’s Rights

Protection Against Exploitation

• Pay only the legal increase (CPI or contractual rate)
• Landlord cannot evict for refusing excessive increase
• Document all rent payments
• Communicate in writing

If Landlord Refuses Legal Amount

• Deposit rent to court account
• File lawsuit to determine legal rent
• Keep all payment receipts

Landlord’s Rights

Ensuring Fair Return

• File rent determination lawsuit after 5 years
• Document market rates in the area
• Consider property improvements when arguing for increase
• Properly notify tenant of increases

Legal Assistance: We represent both landlords and tenants in rent increase disputes, determination lawsuits, and mediation proceedings. Contact us for tenancy law expertise.

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Professional Legal Support

Contact us for professional legal assistance on this matter.

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⚖️ Attorney Fevzi Yaşkir - Licensed attorney at Konya Bar Association providing legal consultation and case management services for international clients.