What will change in the calculation basis for apartment tax in Mersin?
On August 6, 2026, Clarification No. 90 to the Real Estate Tax Law was published in the Resmî Gazete. It established the standard costs per square meter of a building for calculating the taxable value of real estate in 2027. Apartment owners in Mersin should check the municipal assessment of their property, but this publication does not automatically increase the tax by a specific amount.
The market price reflects the terms of the transaction and the specifics of the apartment, while the tax value is calculated according to established rules, taking into account the standard building costs and the value of the land or share in it. The table covers only one element of the calculation. Therefore, it's important to factor the annual tax into housing expenses, but it should be assessed based on information about the specific property and municipality.
What exactly was approved for 2027?
Notification No. 90 contains a table of standard building construction costs for tax assessment purposes. The standard depends on the building type and class specified in the table. This is not a construction price list, nor is it the price per square meter of an apartment in Mersin, nor is it an estimate of its market value.
The table does not specify the amount of the owner's bill. Calculating the tax value requires other information, including the land plot or share thereof, as well as property-specific information and regulations. Therefore, equal area does not guarantee equal tax value.
Standard costs apply to the 2027 calculation. They cannot be mixed with the 2026 tax amount or considered an immediate change to the payment in September 2026. The final calculation should be verified using municipal data, not just the table.
Why can't we just multiply the area by the new standard?
The advertised area, the registered area of the independent portion of the building, and the area used in the tax calculation may differ. Furthermore, the assessment is influenced by more than just the building, so multiplying the advertised area by the standard does not yield the tax value or future payment.
The apartment's official registration, building characteristics, plot share, and tax value in municipal records are important. When buying in Yenişehir, Mezitli, Akdeniz, Toroslar, or another area of Mersin, don't transfer numbers from one address to another: check the exact address and property identifiers.
The tax on expensive residential properties is regulated separately. Its criteria and thresholds cannot be derived from the construction cost table. For potentially expensive properties, check the current regulations and don't rely solely on the listing price or seller's valuation.
What to ask for about a specific apartment in Mersin
Before the transaction, ask the seller or authorized representative to show you the municipal tax value and charges for the selected independent portion of the building. If you are located outside of Turkey, request a document or electronic statement in advance and confirm who will receive the updated data on behalf of the owner.
- Verify the address and number of the independent part with the documents; clarify the reasons for any discrepancies before the transaction.
- Request the current municipal tax value and the year it applies to.
- Check accruals and payment confirmations for available periods, as well as any outstanding debt.
- Check with your municipality to find out what data is used to evaluate the property and when the 2027 parameters are applied.
- Compare the official area and characteristics of the apartment with the documents, not with the advertisement.
- For a new, altered, or subdivided property, check to see if the changes are reflected in municipal records.
- If you own jointly, clarify who receives the information and pays the tax: a share does not automatically mean a separate apartment for the purposes of calculation.
- Ask to have it recorded in writing who pays the charges for the periods prior to the transfer of the property.
Property tax does not replace the tax on household income, utilities, insurance, or home maintenance costs. Obtain confirmation for each item separately, rather than combining them into an approximate total.
How to prepare as an owner and buyer
The owner should retain the municipal tax value and proof of payment for the current year. After the 2027 assessments are published, compare the data for the same address and confirm with the municipal office what has changed. If the amount is unclear, check the property's characteristics and information, then request clarification or follow the procedure for making a claim. Do not automatically attribute the change to standard costs.
It's a good idea for a buyer to request tax information before agreeing on a budget. When comparing neighborhoods, a similar purchase price and area don't guarantee the same expenses. Check the current official amount, the expected charges according to municipal data, and who will confirm them after title deeds are registered.
It's important for foreign buyers to distinguish between the tax value, the transaction price, and the valuation used for other official procedures. These values cannot be interchanged. If it's unclear which valuation is required, clarify the procedure and the document for which it is calculated.
Practical advice for buying an apartment in Turkey
The new 2027 standard is a reason to check your tax data, not the ready-made tax calculation for every apartment in Mersin. Don't base your payment increase on a single indicator, and don't assume municipal records will update simultaneously for all addresses.
Before the transaction, obtain the current municipal value, verify the identifiers and charges, and then confirm with the municipality the calculation procedure for next year. This will allow you to compare verified expenses, rather than an approximate estimate based on the area or listing price. This material describes the general procedure and is not a substitute for individual tax advice.
If you're looking for real estate in Mersin, INCOME MERSIN specialists can help you incorporate annual expenses and documentation requests into your overall apartment and neighborhood selection plan. For specific tax questions, it's worth seeking further clarification from the municipality or a specialist.
Sources and date of verification of information
The information was verified on September 26, 2026, based on publications on lexpera.com.tr. Sources used for verification: The original text of Notification No. 90 and the statement that standard construction costs for tax assessment are set for 2027; the text indicates that the building value is calculated taking into account the standard costs.
