Rent Increase Rate Calculator

Update your current rent based on the 12-month average CPI change rate, without exceeding the legal ceiling.

Runs 100% in your browser — your rent amount is never sent anywhere.

The default rate is the latest 12-month average CPI change rate (32.03%) announced by TÜİK in July 2026 (based on June 2026 data). You can check the current rate for your own renewal month from TÜİK's Consumer Price Index bulletins and enter it in the box above yourself.

Increase Amount
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New Rent Amount
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Applied Rate
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This calculator is not legal advice; it's for informational purposes only. For residential and roofed workplace rentals, the legal increase ceiling under Article 344 of the Turkish Code of Obligations is the 12-month average change rate of the CPI (the temporary 25% cap regulation ended on 1 July 2024). If your contract has continued with the same person for more than five years, or is completing its fifth year, a judge may rule on an amount exceeding the CPI rate (Art. 344, last paragraph) — in that case the calculation result may not reflect the applicable ceiling. In case of a dispute, consult a lawyer or mediator.

Why Is the Rent Increase Rate Tied to the CPI?

In Turkey, the annual rent increase rate for residential and roofed workplace rentals cannot be freely set by the parties; Article 344 of the Turkish Code of Obligations limits it to the 12-month average change rate of the Consumer Price Index (CPI) announced monthly by the Turkish Statistical Institute (TÜİK). This is a legal ceiling that applies to rent; even if the contract states a higher rate, the tenant is not obligated to pay the portion exceeding this ceiling. The purpose of this rule is to protect the tenant from high, unpredictable rent hikes while still allowing the landlord to update the rent by a reasonable measure against inflation.

The 12-month average CPI change rate is an indicator, updated every month, that reflects the average of the monthly inflation data for the last 12 months, and TÜİK announces it at the start of each month together with the previous month's data. This rate is different from the overall annual inflation rate (annual CPI change) and is the correct figure to use as the basis for a rent increase. This tool uses the rate you enter for the date your rent renews to instantly calculate the increase amount and your new rent.

When to use it: to check whether the increase rate your landlord is requesting exceeds the legal ceiling as your rental contract's anniversary approaches, to calculate the new rent amount in advance as a tenant or landlord, or to compare scenarios based on different CPI periods. For an accurate result, it's important to check the current 12-month average CPI rate for your own contract renewal month from TÜİK's official bulletins and enter it in the box — the tool comes with a default rate, but since that rate changes every month it can become outdated.

The rent amount and rate you enter are processed only in your browser, never sent anywhere, and aren't stored anywhere after the calculation. As noted in the legal warning below, this tool is not a substitute for legal advice; as long as you enter the correct rate, the calculation itself is correct, but keeping the rate current is your own responsibility.

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Frequently Asked Questions

Under Article 344 of the Turkish Code of Obligations, the annual increase rate for residential and roofed workplace rentals cannot exceed the 12-month average change rate of the Consumer Price Index (CPI) published by TÜİK. This rate is updated every month; you should use the rate for the month your contract renews.

If the rate requested in your contract or verbally exceeds the legal ceiling, that portion isn't binding on the tenant; you're not obligated to accept an increase above the CPI ceiling. In case of a disagreement, it's recommended to consult a lawyer or mediator.

Yes. Under the last paragraph of Article 344 of the Code of Obligations, for rental contracts longer than five years or renewed after five years, at the end of each five-year period a judge may determine a new, equitable rent by jointly evaluating the CPI rate, the condition of the property and comparable rents. In that case the CPI ceiling alone may not be binding.

No, they're two different calculation methods. The annual CPI change rate compares one month's index to the same month's index exactly 12 months earlier (point-to-point). The 12-month average change rate instead compares the average index of the last 12 months to the average of the preceding 12 months; it usually comes out different from the annual rate. For rent increases, the measure required by the Turkish Code of Obligations is always this 12-month average, not the annual CPI.

If the contract doesn't specify an increase rate, the rent is determined equitably by a judge, on condition that it doesn't exceed the 12-month average CPI change rate from the previous rental year. In practice, parties usually reach an agreement based on this CPI rate without going to a dispute.

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