Rent Determination Lawsuit and Its Principles

Introduction

A lease agreement is a contract involving reciprocal obligations, where the tenant’s primary duty is the payment of rent. Although the rent is initially freely agreed upon by the parties, issues may arise in determining the rent applicable for a renewed lease period. In such cases, since the lease is a remunerative contract, determining the rent as compensation for the tenant’s use of the property becomes a legal obligation. In this context, the determination of rent, the principles of such determination, the rent determination lawsuit, and its legal nature are examined within the framework of the Turkish Code of Obligations (TCO).

To prevent uncontrolled increases in rent and ensure a fair rent, various limitations have been imposed on rent increases. Additionally, the law allows for the court to determine rent in certain situations. The lawsuit filed for this purpose is called a rent determination lawsuit. For the tenant, it ensures that the rent is determined fairly and prevents uncontrolled increases, while for the landlord, it ensures that the rent reflects current economic conditions and market rates. Therefore, this lawsuit plays a central role in balancing the rights of both parties.

Determination of Rent and Its Principles

The parties to a lease agreement may initially set the rent freely within the principle of freedom of contract. However, during the continuation of the lease, certain limitations on rent determination are imposed by the TCO, particularly to protect the tenant. These limitations aim to ensure that rent is determined fairly and to protect the tenant from excessive increases.

It is possible for the parties to agree in advance on the rate of rent increase applicable to a renewed lease period. In such cases, the agreed increase rate determines the rent for the new period. However, such an agreement is valid only under certain conditions. The agreed rate of increase cannot exceed the twelve-month average change in the Consumer Price Index (CPI) of the previous rental year.

If the parties agree on a rate equal to or lower than this limit, the rent for the renewed period is determined based on that rate.

If no agreement is made or the lease continues for a prolonged period, a rent determination lawsuit can be filed under certain conditions. When the parties have not agreed on the rent applicable to a renewed period, the court determines the rent based on the condition of the property, ensuring that it does not exceed the twelve-month average change in the previous year’s CPI. In such cases, rent is determined according to the property’s condition and CPI averages, not comparable rents.

Even if the parties have a valid agreement on the rent for a renewed period, a lawsuit can still be filed for the rent to be determined by the court according to comparable rents after the fifth year. In this case, the court considers the CPI change, the condition of the property, and comparable rents to determine a fair rent. For example, if the lease starts on 01.01.2025, a lawsuit can be filed to determine the rent for the period beginning 01.01.2030 according to comparable rents.

Deadline for Filing a Rent Determination Lawsuit

A lawsuit to determine rent can be filed at any time. However, to ensure the rent is effective from the beginning of the renewed period, the lawsuit must be filed at least thirty days before the new period starts or a notice must be given to the tenant, allowing the lawsuit to be filed by the end of the rental period. Otherwise, the court-determined rent will be effective only for the period after the lawsuit is filed. For instance, for a one-year lease starting on 01.01.2025, a lawsuit to determine the rent for the period beginning 01.01.2026 must be filed no later than 02.12.2025, or the tenant must be notified to allow filing until 31.12.2026.

If the lease includes a provision for rent increase in the new period, the rent determined by the court in a lawsuit filed before the end of the new period is valid from the start of that period. For example, in a one-year lease starting 01.01.2025, if a rent increase provision exists, the rent for the period starting 01.01.2026 can be determined via a lawsuit filed by 31.12.2026, even if no notice was given to the tenant.

However, for the rent to be determined according to comparable rents, a five-year lease period must elapse. For instance, if the lease starts on 01.01.2025, a lawsuit can be filed for the period beginning 01.01.2030 to determine rent according to comparable rates. If the contract includes a rent increase clause or the tenant was notified at least thirty days in advance, the lawsuit can be filed by 31.12.2030; otherwise, it must be filed by 02.12.2029.

Legal Nature of the Rent Determination Lawsuit

The rent determination lawsuit is fundamentally a declaratory action. Its purpose is for the court to determine the nature and scope of an existing legal relationship. In this lawsuit, the court evaluates whether the rent complies with the TCO and market conditions and issues a decision accordingly.

Filing the lawsuit eliminates uncertainties regarding the lease agreement and protects the rights of both the tenant and the landlord. The court’s decision ensures that the determined rent applies to the future period.

Parties in a Rent Determination Lawsuit

The parties to a rent determination lawsuit are the tenant, the lessor, or the property owner. The lessor refers to the person renting out the property, the owner refers to the property owner, and the tenant is the user of the property. All three parties can apply to the court for a fair determination of the rent.

If multiple parties are involved on either the landlord or tenant side, the lawsuit must be filed against all or by all jointly.

Equity Discount in Rent Determination

Even when the court determines the rent according to comparable rates after the fifth year, it must also act equitably. In practice, when the property is rented vacant, the court first determines the potential monthly rent, then applies a discount of at least 5% and at most 20% based on the tenant’s duration of occupancy.

Enforcement of Rent Determination Decision and Rent Difference Claim

The rent difference arising from the court’s decision becomes enforceable and actionable upon finalization. Therefore, a rent determination decision can only be enforced after it is finalized, and interest on rent differences can only be claimed from the date of finalization. Since the court decision only contains a declaratory ruling, it cannot be directly enforced through a standard enforcement procedure.

Conclusion

The rent determination lawsuit is a fundamental legal tool that allows the court to determine rent when there is a dispute between the parties. Compliance with the TCO provisions in determining rent helps prevent potential legal issues.

This lawsuit protects the tenant’s rights while safeguarding the landlord’s economic interests. Therefore, it is an indispensable mechanism in ensuring fairness and equity in rental relationships.