From the Central Bank of the Republic of Turkey:

COMMUNIQUÉ ON INTERNATIONAL BANK ACCOUNT NUMBER1

(Number: 2008/6)
(Published in the Official Gazette dated 10 October 2008 and numbered 27020.)

Purpose and scope

ARTICLE 1 – (1) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 1.) The purpose of this Communiqué is to determine the principles and procedures regarding the implementation of the international bank account number by payment service providers.

Legal basis

ARTICLE 2 – (1) This Communiqué has been issued based on subparagraph (f) of paragraph (I) of Article 4 of the Central Bank of the Republic of Turkey Law dated 14/01/1970 and numbered 1211.

Definitions

ARTICLE 3 – (1) In this Communiqué;

a) Bank: Banks defined in Article 3 of the Banking Law dated 19/10/2005 and numbered 5411,

b) (Amended subparagraph: Official Gazette-21/12/2012 – Communiqué No. 2012/14/Art. 1.) Electronic Funds Transfer (EFT) System: The interbank Turkish Lira transfer system and the customer-to-customer Turkish Lira transfer system,

c) IBAN-(International Bank Account Number): The International Bank Account Number created in accordance with ISO Standard No. 13616,

ç) ISO-(International Organization for Standardization): The International Organization for Standardization,

d) (Amended subparagraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 2.) Customer: Real and legal persons receiving services from payment service providers,

e) (Added subparagraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 2.) Payment service provider: The institutions listed in the first paragraph of Article 13 of the Law on Payment and Securities Settlement Systems, Payment Services and Electronic Money Institutions dated 20/6/2013 and numbered 6493,

shall mean.

IBAN structure

ARTICLE 4 – (1) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 3.) The IBAN consists of 26 alphanumeric characters indicating only one account. The character sequence from left to right is made as shown in Annex 1 according to the principles specified below.

Number of Characters	Character Type	Description
2	Alphabetic Character (A-Z)	Country Code
2	Numeric Character (0-9)	IBAN Check Digits
5	Numeric Character (0-9)	Payment Service Provider Code
1	Numeric Character (0-9)	Reserved Field
16	Numeric/Alphabetic Character	Account Number Field

[1] This is the form amended by Communiqués No. 2009/10, 2011/17, 2012/14, 2020/12 and 2021/5 published in the Official Gazettes dated 19 December 2009 and numbered 27437, dated 22 December 2011 and numbered 28150, dated 21 December 2012 and numbered 28504, dated 15 May 2020 and numbered 31128, and dated 5 August 2021 and numbered 31559.

(2) The letters “İ,Ç,Ğ,Ö,Ş,Ü” and lowercase letters are not used in the generated IBAN.

(3) Turkey's country code is “TR” according to ISO Standard No. 3166.

(4) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 3.) The payment service provider codes to be used when generating the IBAN are determined by the Central Bank of the Republic of Turkey.

(5) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 3.) There is no standard format for the account number field. However, it is mandatory that the 16 digits determined as the account number be written right-aligned and that any spaces on the left side be filled with zeros.

(6) The Reserved Field Section is filled with zeros for all account numbers.

(7) The calculation and verification of the check digits are performed using the MOD 97-10 method created in accordance with ISO Standard No. 7064 shown in Annexes 2 and 3 of this Communiqué.

Generation of IBAN

ARTICLE 5 – (1) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 4.) Banks are obliged to generate an IBAN for each customer account subject to money transfer at their institution in accordance with the principles specified in this Communiqué and to notify the account holders of the IBAN information.

(2) (Added paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 4.) Payment service providers other than banks may also generate an IBAN for customer accounts subject to money transfer. The generation of an IBAN by payment service providers other than banks for customer accounts subject to money transfer is not mandatory unless there is a provision to the contrary in the system rules of the payment system in which they participate as participants within the scope of Law No. 6493.

Display of IBAN

ARTICLE 6 – (1) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 5.) Payment service providers that generate an IBAN within the scope of this Communiqué are obliged to display the IBAN in the documents they will create for their customers regarding the accounts subject to money transfer in written and electronic media and that contain the account number.

(2) The usage format of the IBAN in electronic media consists entirely of consecutive characters. No spaces are left between the characters and no separators are used.

(3) On written documents, the IBAN is displayed in groups of four digits starting from the left, with spaces between them.

Use, verification and exceptions of IBAN (Amended title: Official Gazette-21/12/2012 – Communiqué No. 2012/14/Art. 2.)

ARTICLE 7 – (1) (Amended paragraph: Official Gazette-19/12/2009 – Communiqué No. 2009/10/Art. 1. and Official Gazette- 5/8/2021 – Communiqué No. 2021/5/Art. 6.) In money transfers made to accounts in countries located in the European Economic Area, the verification and use of the recipient's IBAN is mandatory. However, this obligation is not sought in transactions carried out between payment service providers and financial institutions performing cross-border payments abroad on their own behalf and account, and in transactions where the customer's declaration that the recipient's IBAN will not be notified is obtained despite being requested. The regulations regarding the relations of payment service providers with financial institutions abroad are reserved.

(2) (Amended paragraph: Official Gazette-5/8/2021 – Communiqué No. 2021/5/Art. 6.) In incoming money transfers where the recipient account number is specified as an IBAN, verification of the IBAN is mandatory.

(3) (Amended paragraph: OG-5/8/2021 – Communiqué No. 2021/5/Art. 6) In money transfers made from the customer's account by payment service providers that create an IBAN within the scope of this Communiqué, the use of the IBAN belonging to the sender is mandatory.

(4) (Amended paragraph: OG-19/12/2009 – Communiqué No. 2009/10/Art. 2 and OG-5/8/2021 – Communiqué No. 2021/5/Art. 6) In payment systems operated by the Central Bank of the Republic of Turkey, the verification and use of the IBAN belonging to the recipient is mandatory. However, in money transfers made to an account via the EFT System, this obligation shall not be sought in transactions in which the customer's declaration that the IBAN belonging to the recipient will not be notified despite being requested has been received.

(5) (Added paragraph: OG-21/12/2012 – Communiqué No. 2012/14/Art. 2) In money transfers to be made by banks and other financial institutions abroad from their accounts held with banks, the use of IBAN is not mandatory.

ARTICLE 8 – (1) (Amended paragraph: OG-5/8/2021 – Communiqué No. 2021/5/Art. 7) Following the control carried out in accordance with the provisions of the seventh paragraph of Article 4 of this Communiqué, transfer orders whose IBAN is determined to be incorrect may be returned or rejected.

Application to the Post and Telegraph Organization Joint Stock Company (Added article: OG-15/05/2020 – Communiqué No. 2020/12/Art. 1)

ADDITIONAL ARTICLE 1- (Repealed: OG-5/8/2021 – Communiqué No. 2021/5/Art. 8)

PROVISIONAL ARTICLE 1 - (Repealed: OG-21/12/2012 – Communiqué No. 2012/14/Art. 3)

Entry into force

ARTICLE 9 – (1) Article 6 and the first paragraph of Article 7 of this Communiqué shall enter into force on 01/01/2009, the second, third and fourth paragraphs of Article 7 and Article 8 shall enter into force on 01/01/2010, and its other articles shall enter into force on the date of its publication.

Execution

ARTICLE 10 – (1) The provisions of this Communiqué shall be executed by the Governor of the Central Bank of the Republic of Turkey.

International Bank Account Number Structure in Turkey

TR xx yyyyy 0 zzzzzzzzzzzzzzzz
Account Number consists of 16-digit uppercase letters and/or digits.
Reserve Field consists of a single-digit digit.
0 is used until it is changed.
Payment Service Provider Code consists of 5 digits. Codes that do not consist of 5 digits are written right-aligned and are made 5 digits by adding a zero at the beginning.
Check Digits consist of 2-digit digits.
Country Code consists of 2 uppercase letters,
TR is used for Turkey.

CALCULATION OF IBAN CHECK DIGITS

Preliminary Step

An artificial number is created starting with the country code (ISO 3166 standard) and "00" and continuing with the account number to be converted to IBAN. This number must not contain non-numeric/alphabetic characters or spaces.

For example: The account number "0100000350930001" at the Central Bank of the Republic of Turkey (00001) Ankara Branch will become TR000000100100000350930001 after this process.

Step 1

The first four characters are moved to the end of the number.

Result = 0000100100000350930001TR00

Step 2

The letters in the number are converted to numeric characters in accordance with the "Conversion Table" shown below.

Result = 0000100100000350930001292700

Step 3

The MOD 97-10 (ISO 7064 standard) method is applied.

The remainder from dividing the found number by 97 (MOD 97-10) is subtracted from 98. If the result is a single digit, a zero is added at the beginning.

98 - 51 = 47

IBAN = TR470000100100000350930001 will be in the form.

CONVERSION TABLE

A = 10	G = 16	M = 22	S = 28	Y = 34
B = 11	H = 17	N = 23	T = 29	Z = 35
C = 12	I = 18	O = 24	U = 30
D = 13	J = 19	P = 25	V = 31
E = 14	K = 20	Q = 26	W = 32
F = 15	L = 21	R = 27	X = 33

VERIFICATION OF IBAN CHECK DIGITS

Preliminary Step

If there are non-numeric/non-alphabetic characters and spaces in the IBAN, they are deleted.

For example: The IBAN in the form “TR47 0000 1001 0000 0350 9300 01” is cleared of spaces and brought to the form “TR470000100100000350930001”.

Step 1

The first four characters of the IBAN are moved from their current place to the right side of the number.

Result = 0000100100000350930001TR47

Step 2

The letters in the number are converted to numeric characters in accordance with the “Conversion Table” in Annex 2.

Result = 0000100100000350930001292747

Step 3

The MOD 97-10 (ISO Standard No. 7064) method is applied to check the accuracy of the check digits.

For the check digits to be correct, the remainder from dividing the resulting number by 97 (MOD 97-10) must be 1.

The remainder from dividing the number “0000100100000350930001292747” by 97 is 1.

Thus, the accuracy of the check digits in the given IBAN is proven.

For software for MOD calculations, if the number on which the mod calculation is performed is very long (a 32-bit or 64-bit data represents a 9- or 18-digit number), the calculation can be performed by dividing the number on which the mod calculation will be performed into 9- or 18-digit groups.

Example:

• The remainder from dividing the number 0000100100000350930001292747 by 97 is 1.

• The MOD 97-10 value of the first 9 (or 18) digits of the number is calculated.

• MOD 97-10 of 000010010 = 19

• By adding the remaining numbers to the end of the found number, the number of digits is completed to 9 (to 18) and its MOD 97-10 is calculated.

• MOD 97-10 of 19000035093 = 43

• It is repeated with the remaining numbers from the previous step.

• MOD 97-10 of 430001292747 = 1 (The same result is reached.)