A Turkish tax number is the identifier the Revenue Administration issues so that a foreign buyer can be recorded on a bank account, a currency conversion and a title deed. The identifier comes in two forms and Turkish law rather than the buyer decides which one applies, a ten digit potential tax number for anyone without a Turkish residence permit and an eleven digit foreigner identity number beginning 99 for anyone who holds one. Obtaining the first takes a single online form at the Revenue Administration, whose own announcement tells foreign applicants there is no trip to the tax office and no queue, and tax offices now accept counter applications only where the online identity check fails. The switch to the second is where the real cost sits, because a communiqué published in the Resmî Gazete on 22 May 2010 requires a registered taxpayer who later obtains a foreigner identity number to notify their tax office within one month, and owners whose income includes rental income from property report it with their next return. The number is built from passport data, so a reissued passport carrying a different transliteration of a name breaks the match rather than the number. Holding a Turkish tax number carries no immigration effect and creates no filing obligation by itself, although owning an apartment in Alanya creates obligations that arrive independently of it. Every party to a purchase needs a number in their own name, joint buyers and children under 18 included.
Which Turkish tax number is legally yours
A foreign national dealing with Turkish institutions holds one of two tax identifiers, and Turkish law rather than the taxpayer decides which one applies. A foreign national without a Turkish residence permit receives a ten digit potansiyel vergi kimlik numarası (potential tax identification number) from the Gelir İdaresi Başkanlığı (Revenue Administration). A foreign national who holds a residence permit already has a yabancı kimlik numarası (foreigner identity number), an eleven digit number beginning 99, and that number is their tax number.
The rule has a name, a date and a gazette reference. Vergi Kimlik Numarası Genel Tebliği (Seri No: 4), published in the Resmî Gazete on 22 May 2010 under issue 27588, states that from the start of the application foreigners holding a foreigner identity number write that number into the tax identification number line on documents. The same communiqué closes the point in its final section: from 1 July 2010, for foreign nationals holding a foreigner identity number, only the foreigner identity number is used as the tax identification number in the transactions concerned.
Two facts follow from the wording rather than from custom. The communiqué describes the older identifier as the tax number "consisting of ten digits" issued by tax offices, which is where the ten digit shape comes from. It also disapplies that older rule for anyone holding a foreigner identity number, which is why an owner with a residence permit cannot simply keep using the number they were first given.
| Identifier | Who holds it | Digits | Issued by | Where it appears |
|---|---|---|---|---|
| Potansiyel vergi kimlik numarası | Foreign national with no Turkish residence permit | 10 | Revenue Administration | Application output, bank file, tapu, notarial contract |
| Yabancı kimlik numarası | Foreign national holding a Turkish residence permit | 11, beginning 99 | Directorate General of Population and Citizenship Affairs | Residence permit card, and the tax number line on every form |
Consider a Norwegian buyer purchasing an apartment in Mahmutlar, a coastal neighbourhood in the Alanya district of Antalya province. Arriving on a tourist entry stamp, the buyer obtains the ten digit potential number and the whole purchase file is built on it. Two years later the same buyer takes a one year residence permit and receives an eleven digit number beginning 99. The purchase file did not change, but the identifier the tax system expects from that person did.
How to apply online, and whether someone can do it for you
The Revenue Administration issues the potential tax number through its own online channel, and the application asks for identity details plus a photograph of the passport identity page. The administration's own announcement puts the point bluntly, telling foreign applicants there is no trip to the tax office and no queue.
The published steps run in a fixed order.
- Open the Revenue Administration's interactive tax office at ivd.gib.gov.tr.
- Select the potential tax identification number application for foreigners.
- Complete every field on the form.
- Attach a photograph of the identity page of your passport.
- Confirm the application.
The form asks for name, surname, gender, foreigner identity number, place of birth, mother's name, father's name, country, passport number, telephone number and address. The number itself appears on the page that opens, on the line beneath the applicant's name. Applicants who already hold a foreigner identity number fill that field; applicants who do not leave it empty, because the absence of that number is precisely what makes the potential number necessary.
One thing the Revenue Administration does not publish is how long the number takes to issue. Guides that promise a number within fifteen minutes or on the same day are quoting each other rather than the administration, and a buyer planning a purchase timetable should treat the step as fast but not instantaneous.
A representative can still obtain the number under a notarised power of attorney, and for many years that was the normal route. The online channel changes the calculation. Every authority written into a power of attorney is an authority somebody can exercise, so a buyer who obtains the number before the notary appointment can have the deed drafted without that clause in it. Buyers arranging a purchase from abroad will find the wider set of proxy limits in the material on buying property in Turkey remotely, where the currency conversion rather than the tax number turns out to be the hard constraint.
When a Turkish tax office will turn you away
The tax office counter is a fallback channel rather than an equivalent alternative to the website. An announcement published by the provincial migration authority in İstanbul, addressed to foreign nationals, states that tax offices accept applications only from people whose online application returned the warning that their identity and passport details could not be verified. Numbers obtainable online are not issued at the counter.
This inverts the framing used across almost every English language guide, which presents two equal doors and lets the reader pick. Under the announcement there is one door and one repair hatch. A Swedish buyer who takes a morning out of a viewing trip in Alanya to queue at the tax office, holding a passport that scans cleanly, is likely to be sent back to the website with nothing gained.
Two qualifications belong with the rule. The announcement carries a date of 25 November 2020, and it comes from a migration authority rather than from the Revenue Administration's own current guidance, so a buyer relying on it should confirm the position before travelling. The practical instruction survives either way, because attempting the online application first costs nothing and produces the exact error message the counter asks to see.
How to find a Turkish tax number you were already given
A Turkish tax number is retrieved rather than reissued, because the number is recorded against the passport data used to obtain it. Applying a second time does not produce a second identity. The number already exists in the Revenue Administration's records and in six documents the owner probably already holds.
Most owners who believe they have lost the number are holding it. The number is written on the output page produced by the original application, and it repeats across the purchase file.
| Document | Which number it carries | Who holds a copy |
|---|---|---|
| Revenue Administration application output | The number as issued | The applicant |
| Tapu (title deed) | The buyer's tax identifier | The owner and the Land Registry |
| Döviz alım belgesi (currency purchase document) | Name and passport number, or foreigner identity number | The owner and the bank |
| Notarial sale contract | Foreigner identity number or potential tax number | The parties and the notary |
| DASK earthquake insurance policy | The policyholder's identifier | The owner and the insurer |
| Turkish bank account file | The identifier given at account opening | The bank |
Honesty is required about the lookup channel itself. Turkish accounting and legal publications describe a screen for querying a foreigner's potential tax number using passport number, country and date of birth. The publicly accessible verification menu on the Revenue Administration's interactive tax office lists six services as of August 2026, covering receipt verification, e-document verification, beneficial owner document verification, interactive tax office document verification, taxpayer status verification and payments made against a foreign licence plate or passport number. A foreigners' tax number lookup is not among them. The screen may sit behind a login or under an address not published in that menu.
The reliable route is therefore documentary rather than digital. Check your own documents first, starting with the tapu and the bank file, since those are the two most owners can lay hands on quickly. Where none of them is available, take your passport to a tax office and ask for a copy of the existing record rather than making a fresh application, because retrieving a record and applying for a number are different requests and only the second one risks a duplicate. A representative holding a notarised power of attorney can make the same request.
One route is worth ruling out. Do not submit the online application a second time in the hope of being shown the number, because the outcome of a duplicate submission is not documented by the Revenue Administration and the alternative costs a single visit.
Your Turkish tax number changes when you get a residence permit
Obtaining a Turkish residence permit replaces your tax identifier, and the replacement is a legal requirement rather than an administrative preference. Vergi Kimlik Numarası Genel Tebliği (Seri No: 4) is explicit on what happens to documents: from the date the application starts, the foreigner identity number is written into the tax identification number line.
The communiqué also settles what an institution may ask you to show. Foreign nationals holding a foreigner identity number complete their transactions by presenting the foreigner identity number stated on their residence permit or on letters obtained from the competent authorities. A photocopy of an old tax office slip is not the evidence the rule contemplates.
The disapplication clause matters most to long standing owners. An earlier communiqué had told foreign nationals to carry on using the ten digit number issued by tax offices, on the reasoning that they were not given Turkish identity numbers. Communiqué number 4 states that this earlier arrangement does not apply to foreign nationals who hold a foreigner identity number. An Alanya owner who bought in 2024 on a ten digit number and took a residence permit in 2026 sits inside that disapplication.
The one month clock that follows a residence permit
A foreign national who already has a Turkish tax registration and later obtains a foreigner identity number must notify their tax office within one month of receiving it. Communiqué number 4 states the obligation twice, covering taxpayers whose registration predates the new number and taxpayers registered after the communiqué was published, and both paragraphs use the same one month period running from the date the foreigner identity number is obtained.
A different deadline applies to a group that includes most foreign property owners who let their apartments. Taxpayers whose income consists of wages, gayrimenkul sermaye iradı (income from immovable property), income from movable capital or other earnings notify their foreigner identity number with the first tax return they file after obtaining it. The Turkish text names rental income from property in that list, which places an Alanya landlord squarely inside the paragraph rather than adjacent to it.
| Situation | What starts the clock | Deadline |
|---|---|---|
| Registered taxpayer obtains a foreigner identity number | The date the number is obtained | One month, notified to the tax office where the taxpayer is registered |
| Taxpayer whose income is wages, rental income or investment income | The date the number is obtained | With the first return filed after that date |
| Owner with no tax registration at all | Nothing in these paragraphs | The obligation attaches to registration, not to ownership |
The third row is the honest one. The subject of these paragraphs is a mükellef, a registered taxpayer, so an owner who has never had a Turkish tax registration is not directly inside them. Ownership alone does not create the registration, but letting the apartment can, and a foreign owner who has been declaring rental income for years and then takes a residence permit is exactly the person the rule is written for.
A German owner in Oba who has declared rental income since 2023 and receives a residence permit in March 2026 illustrates the sequence. The new number arrives in March. The notification to the tax office is due within a month of that date, and the number then appears on the return filed for the 2026 income year. Nothing about the apartment, the tenancy or the title deed changes; the identifier attached to the file does.
Your number is only as good as your passport
The potential tax number is built from the passport data supplied when it was obtained, so a reissued passport carrying a different transliteration of your name can break the match. Nothing about the number itself changes. What changes is whether a bank, a notary or a registry official can tie the person in front of them to the record.
Turkish institutions run this check across four documents at once. The spelling on the passport has to agree with the sworn translation, with the tax record and with the entry on the title register. Owners from countries whose alphabets do not map cleanly into Latin script meet this problem more often, because a passport reissued years later can render the same name differently without anything being wrong. The same failure mode stops title deed transfers in Turkey, where a name mismatch turns a routine appointment into a separate correction application.
The practical response is preventive. Compare the name on your current passport against the name on the document that carries your tax number before you need the number for anything time critical, and raise any difference with the Revenue Administration rather than at a bank counter on the day of a transfer. Whether the administration updates a potential tax number record automatically when a passport is replaced is not something it publishes, which is itself a reason to check early rather than assume.
What a Turkish tax number does not do
Holding a Turkish tax number is an identity record rather than a tax status, and obtaining one does not make you a taxpayer in Turkey. Tax liability is established separately. The number exists so that transactions can be recorded against a person, which is why banks, notaries, insurers and the Land Registry all ask for it.
| Common assumption | The actual position |
|---|---|
| A tax number gives some right to stay in Turkey | It carries no immigration effect at all, and residence permits are a separate application to the migration authorities |
| A tax number makes you a Turkish tax resident | Residence for income tax purposes turns on the tests in the Income Tax Law, not on holding an identifier |
| A tax number creates an annual filing obligation | Filing follows from income arising, not from the number existing |
| A Turkish tax number affects what you declare at home | Your obligations in your own country are unchanged by it |
Turkish income tax law draws the residence line by reference to where a person's residence is and how long they stay. Under Law 193, a person whose residence is not in Turkey and who does not stay in Turkey continuously for more than six months within a calendar year is treated as a limited taxpayer, taxed only on earnings arising in Turkey, while a person settled in Turkey is taxed on worldwide income. The six month test carries statutory exceptions, and where a stay approaches that length the question belongs with a Turkish accountant rather than with a rule of thumb.
There is a corollary worth stating plainly, even though it works against the reassuring version of this topic. A tax number does not create obligations, but owning an apartment in Alanya does create some. Property tax arises from ownership, and letting the apartment produces rental income that has its own declaration regime for non resident owners. Those obligations exist whether or not the owner thinks of themselves as a Turkish taxpayer, and they are not switched on or off by which identifier is written on the file.
Where the number is actually used in an Alanya purchase
The tax number sits at the head of the purchase chain, because the bank account, the currency conversion and the registration all ask for it. Obtaining it late does not slow one step, it slows every step downstream.
| Stage | Who asks for the number | What goes wrong without it |
|---|---|---|
| Opening a Turkish bank account | The bank | The account cannot be opened, and the transfer has nowhere to land |
| Selling foreign currency for lira | The bank | No currency purchase document is produced |
| Title deed transfer | The Land Registry Directorate | The buyer cannot be entered on the tapu |
| DASK earthquake policy | The insurer | The policy cannot be issued in the buyer's name |
| Utility subscriptions | The utility | Contracts cannot be opened in the owner's name |
| Property tax and municipal records | The municipality | The owner's record cannot be matched |
One detail in that chain deserves separating out, because it disposes of a common worry. The currency purchase document must carry the name and passport number or foreigner identity number of the person for whom the currency was sold. Passport number is accepted in the alternative, which means a buyer with no residence permit and therefore no eleven digit number can still have the document issued correctly in their own name.
A buyer who obtains the number during a viewing trip rather than on the purchase trip removes the whole dependency from the schedule. That is also why spending a viewing day queuing for it is poor use of a short window, given that the application is an online form.
One number per party: joint buyers, children and companies
Every party acquiring an interest in a Turkish property needs a tax identifier in their own name, and none of them can borrow another party's. The registry records people, not households.
| Buyer | What is required |
|---|---|
| Two individuals buying jointly | Two separate numbers, one per buyer, regardless of the shares |
| A married couple | Two numbers, because a spouse is a separate acquiring party |
| A child under 18 | A number in the child's own name, not a parent's |
| A company | The company's own tax identification number, which is distinct from any shareholder's |
The point catches couples most often. A husband and wife who assume that one number covers the family find the application stalled at the counter, because the tapu will name two acquirers and the registry needs an identifier for each. Buying jointly in Turkey raises further questions about shares and later exit, and the number is only the administrative first step among them.
Children are the sharper case. A foreign minor named on a title deed needs a Turkish tax number issued in the child's own name, alongside a passport and a birth certificate carrying an apostille and a sworn Turkish translation. Buying in the name of a child under 18 changes considerably more than the paperwork, and the identifier is the least of it.
What to do when something is wrong with your number
Deal with an incorrect or duplicated tax number before it reaches a transaction, because the number appears on documents that are slow and expensive to correct afterwards. A title deed carrying the wrong identifier is not a clerical matter once it is registered.
Work through the questions in order.
- Check which identifier your current status calls for, since a residence permit means the eleven digit number regardless of what your older documents say.
- Compare the name and passport details on your tax record against your current passport.
- Notify your tax office if you hold a Turkish tax registration and have obtained a foreigner identity number, within the one month period the rules set.
- Present the foreigner identity number as it appears on your residence permit or on an official letter, rather than from memory or an old slip.
- Raise any remaining discrepancy with the Revenue Administration before a bank appointment or a registry appointment, not during one.
A caution belongs at the end of that list. The Revenue Administration does not publish a consolidated procedure for merging duplicate records or correcting an issued number, and no reliable public description of one was found. What the rules do settle is which number you present and when you must report a change, which is enough to prevent most of the situations where a correction would be needed.