Rent Increase Rate Calculator
Enter your current rent and CPI rate to calculate your new rent amount. You can see the legal maximum increase limit.
Residential rent increases are legally capped at the CPI 12-month average (Turkish Code of Obligations Art. 344).
Miscalculating Rent Increases Can Cost You Dearly
Millions of tenants and landlords in Turkey face the same question every year at lease renewal: how much can I increase the rent? An incorrectly calculated increase either puts the landlord at a disadvantage or leaves the tenant facing an illegal surcharge. This tool calculates the new rent amount in minutes based on the CPI 12-month average, within the framework of Article 344 of the Turkish Code of Obligations.
Legal Framework for Rent Increases
Under Article 344 of the Turkish Code of Obligations, the annual increase rate for residential rents is limited to the 12-month average of the CPI. Even if the tenant and landlord include a higher increase rate in the contract, that clause is void and the increase is reduced to the legal limit. For lease agreements that have reached 5 years, the court may rule an increase above the CPI based on fairness.
What Is the CPI 12-Month Average?
It is the average of the CPI (Consumer Price Index) change rate over the last 12 months, published monthly by TÜİK (Turkish Statistical Institute). This rate, which serves as the basis for rent increases, is the arithmetic average of the 12 months calculated backwards from the lease renewal date. It differs from the annual CPI rate; it may be close to the annual rate during periods of high inflation, or lower during periods of low inflation.
How to Use
Required Inputs
- Current rent; monthly rent amount (TL)
- CPI 12-month average rate; the current rate published by TÜİK (%)
Calculation Formula
Increase amount = Current rent × (CPI rate / 100)
New rent = Current rent + Increase amount
Example: ₺10,000 rent with 48% CPI rate → Increase = ₺4,800 → New rent = ₺14,800.
Example Scenario Table
| Current Rent | CPI Rate | New Rent | Increase Amount |
|---|---|---|---|
| ₺5,000 | 38% | ₺6,900 | ₺1,900 |
| ₺10,000 | 48% | ₺14,800 | ₺4,800 |
| ₺20,000 | 55% | ₺31,000 | ₺11,000 |
| ₺35,000 | 62% | ₺56,700 | ₺21,700 |
This tool is for informational purposes only. For legal disputes, consult a lawyer or refer to the latest CPI data published by TÜİK. The CPI 12-month average rate may change every month.
How to Interpret the Results
The calculator provides two key outputs: new rent amount and increase amount. The new rent amount reflects the legal maximum increase at the CPI limit. The parties may freely agree to stay below this figure, but no increase above it is permitted. The increase amount is expressed monthly; multiply by 12 to see the annual additional cost.
Tips for Rent Increases
- Verify the CPI 12-month average rate from the official TÜİK website (tuik.gov.tr) or the TCMB statistics pages; the rate in the tool may not be current.
- The rent increase date is the lease renewal date — not the beginning of the year. If the contract was signed in April, the increase also takes effect in April.
- Notifying the increase offer in writing (SMS, email, or notarized notice) is important for evidence purposes in any future disputes.
- Commercial leases are not subject to this limit; if not specified in the contract, the parties may negotiate freely.
Frequently Asked Questions
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