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Renewing a Turkish lease in October 2026 starts with the correct inflation measure. The general renewal cap, where the statutory rule applies, is 31.49%: the twelve-month average change in September’s consumer price index, rather than the annual or monthly inflation rate.
Which month determines the rate?
The relevant date is the start of the new rental year. For an October 2026 renewal, the usual reference is September’s CPI bulletin, released by the Turkish Statistical Institute on 5 October 2026. Renewals in other months require the appropriate bulletin. A later fall in the index does not automatically recalculate a renewal completed earlier.A renewal increase is a different issue from the asking rent for a new tenant. Publication of the bulletin does not raise every tenant’s rent immediately: check your renewal date, contractual increase clause and lease category.
Three inflation figures, three meanings
| September 2026 measure | Rate | Relevance to an October renewal |
|---|---|---|
| Twelve-month average change | 31.49% | General reference for the renewal cap |
| Annual change compared with September 2025 | 29.73% | Annual inflation; not the figure used here |
| Monthly change compared with August 2026 | 1.84% | One-month inflation; not the renewal cap |
The cap is not a compulsory increase. A valid lower contractual rate or a lower amount agreed by the parties does not have to be raised to the maximum. A calculation alone also does not replace the proper legal process where a dispute remains unresolved.
Apartment buildings in Istanbul
How to calculate it
Multiply the current monthly rent by 0.3149 to calculate the increase, then add it to the existing rent. Alternatively, multiply the current rent by 1.3149 to obtain the new total. These are arithmetic examples applying the full cap, not market quotations or mandatory amounts for every lease.| Current monthly rent, TRY | Increase at 31.49% | New monthly total, TRY |
|---|---|---|
| 10,000 | 3,149 | 13,149 |
| 15,000 | 4,723.50 | 19,723.50 |
| 20,000 | 6,298 | 26,298 |
| 30,000 | 9,447 | 39,447 |
What Article 344 covers
Article 344 of the Turkish Code of Obligations, Law No. 6098, sets the framework for rent adjustments when residential and roofed workplace leases are renewed. Increase agreements are subject to the limit linked to the twelve-month average CPI. The rent component within the inflation basket is a separate statistical measure.Special provisions apply to leases lasting more than five years or renewed after five years. Comparable rents, the property’s condition and judicial assessment can then play a role in determining rent. The October formula should therefore not be presented as settling every dispute or excluding every judicial reassessment.
A living room and its interior fittings
Check before paying
Record the original start date and annual renewal date. Read the increase clause: does it specify a lower rate or refer to the index? Start with the current basic rent; do not automatically add utility bills or building management charges to the calculation base. Document the calculation and agreed amount, and retain the lease and transfer receipts. A foreign-currency lease or a judicial claim needs its specific provisions checked before using a simple calculator.
When the landlord asks for more
Ask what the demand represents: an ordinary annual increase, a new lease or a rent determination claim after the relevant period. Compare it with the contract and keep a record of the correspondence. A phone message should not be treated as a complete amendment of all contractual terms, and signing a replacement document can have consequences.If disagreement continues, ask a Turkish rental-law professional to review the contract, its duration and payment records. This guide helps you approach that discussion with a correct calculation and organised documents, while recognising cases that require individual assessment.
Receiving the keys to a home
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