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Turkey Rent Increase Calculator: CPI and Legal Cap

Calculate a CPI-based rent increase ceiling for Turkish housing and roofed workplaces; compare contract terms, new monthly rent and annual differences.

Rent Increase Calculator

The duration warning uses the year difference only; check the contract date for the exact duration.

Source: Central Bank of Turkey EVDS, CPI (2025=100), TP.TUKFIY2025.GENEL. The average index for the 12 months ending in the month before renewal is compared with the preceding 12-month average.

For information only; this is not legal advice or a judicial rent determination. The specific contract and court decisions require separate assessment.

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Rent Increase Calculator for Turkey

Estimate the CPI based renewal ceiling for a housing or roofed workplace lease in Turkey. Enter current monthly rent in TRY, choose the renewal date and compare any contractual percentage or agreed new rent with the ceiling. Results include the ceiling rate, the corresponding new monthly rent and monthly and annual differences. The tool does not calculate foreign currency rent adjustments.

What to enter

Provide the renewal month and year, current monthly rent and property type. The date field accepts January 2000 through the current month. An accepted date does not mean the tool assesses every legal rule that may apply to an older lease. Historical contracts can require additional review.
For contract terms, choose no increase provision, a percentage increase or a fixed new monthly rent. The fixed amount means the full new monthly payment in TRY, rather than the amount of the increase. You may also enter the contract's starting year, which is used only for a duration warning.
June 2022 and July 2024 have an additional renewal day field. The day matters at the boundaries of the temporary housing cap. Leaving it blank makes the tool assume the temporary cap applies and display a warning. Enter the actual day when checking one of these historical renewals.

Which inflation measure applies?

For ordinary housing and roofed workplace renewals, the general ceiling under Article 344 of the Turkish Code of Obligations is the change in the twelve month average CPI. It is not monthly inflation, year on year inflation or a producer price index measure. Separate considerations apply to judicial rent determination after longer lease periods.
The temporary 25% housing cap ended on 1 July 2024. It is not the current ceiling for ordinary renewals. For historical calculations, the implementation includes that final boundary day: a housing renewal on 1 July 2024 remains within the temporary period, while 2 July 2024 onward uses the general rule. The temporary cap does not apply to the workplace option. Within the covered housing period, a lower CPI rate takes precedence over 25%.

Data source and calculation

The tool obtains CPI index observations through TCMB (Central Bank of the Republic of Türkiye) EVDS, its Electronic Data Delivery System. The underlying consumer price index is published by TÜİK (Turkish Statistical Institute). The series used is TP.TUKFIY2025.GENEL, the general CPI series with a 2025 base.
The data month is the month before renewal. A November renewal uses October data; a January renewal uses the previous December. Calculating the rate requires 24 consecutive valid monthly index observations. The average index of the latest 12 months is divided by the average of the preceding 12 months, then one is subtracted. This is not an average of monthly inflation percentages.
The resulting percentage is rounded to two decimal places. A history table applies the same calculation to the last 12 data months where sufficient observations exist. Missing or unpublished observations are not replaced with forecasts.

Reading the results

  • New monthly rent at the ceiling: Current rent multiplied by one plus the applicable ceiling rate.
  • Monthly difference at the ceiling: The ceiling rent minus current rent.
  • Annual difference at the ceiling: The monthly difference multiplied by 12. It is not a forecast of later inflation or rent changes.
  • Contract based new rent: The lower of the contract's requested new rent and the calculated ceiling.
Money results are rounded to two decimal places in TRY. If a contractual increase exceeds the ceiling, the tool limits its scenario to the ceiling and displays a warning. If the contractual amount is lower, that lower amount remains the contract result. The monthly and annual difference fields still describe the ceiling scenario, even when a lower contract result appears alongside them.

What if there is no increase provision?

Selecting no increase provision produces a ceiling scenario without a contract based rent result. The ceiling is not automatically a mandatory new payment. Where the parties have no increase agreement, the applicable legal process and circumstances require separate consideration. The tool does not determine what a court would award.
The starting year field also has a limited role. It triggers a warning when the difference between the renewal year and starting year exceeds five. It does not calculate an exact anniversary or assess comparable market rents.

Frequently asked questions

Why is there no result for my renewal month?

The preceding month's index may be unpublished, the consecutive index history may be incomplete or the data request may have failed. The tool displays a corresponding notice instead of estimating the missing inflation figure.

Can I enter rent denominated in another currency?

You can select foreign currency, but the calculator then shows a legal notice and produces no numerical rent adjustment. Foreign currency leases require separate assessment.

Does the tool determine market rent after five years?

No. It does not collect comparable rents, property conditions or the full contract date. The duration warning is a prompt to review those issues, rather than a valuation or a judicial rent determination.
For information only; this is not legal advice or a binding rent determination, and the individual lease requires separate review.