What is the rent increase cap this month?

For leases renewing in October 2026, the legal maximum is 31.49%, the 12-month average CPI change published by TÜİK.

Does the 25% limit still apply?

No. The temporary 25% cap for residential leases ended on 1 July 2024. Since then, the cap is the 12-month average CPI change.

What if my lease says a higher increase?

The part above the cap can’t be enforced against the tenant. The cap applies.

Can the landlord ask for more after five years?

Yes, through a rent determination case, after mediation. The court sets a fair rent based on the market, the property’s condition and CPI.

Rent increase calculator 2026: legal cap 31.49%

How much can rent go up in Türkiye?

For residential leases, the rent for the new lease year can rise by at most the 12-month average change in the consumer price index (CPI) for the previous lease year (Turkish Code of Obligations, art. 344). The temporary 25% ceiling ended on 1 July 2024; since then the CPI average is the only cap.

Latest caps

Renewal month	Maximum increase
October 2026	31.49%
September 2026	31.79%
August 2026	31.90%

TÜİK publishes the figure in the first days of each month. If your lease names a lower rate, the lower rate applies. A higher rate in the lease isn’t enforceable against the tenant.

After five years

Once a tenancy is older than five years, and every five years after that, the landlord can ask a court to set a fair market rent instead of the CPI cap. Mandatory mediation comes first (Law No. 6325, art. 18/B).

Sending the notice

Tell the tenant the new rent before the new lease year starts. A written letter is enough; a notary or registered mail gives you proof of delivery. The tool writes the letter in Turkish and English.