|From the Central Bank of the Republic of Turkey:
THE INTERNATIONAL BANK ACCOUNT NUMBER
- Published in the Official Gazette No.27020 dated October 10, 2008 -
ARTICLE 1 – (1) The purpose of this Communique is to establish the principles and procedures regarding the implementation of the International Bank Account Number by banks.
ARTICLE 2 – (1) This Communique is issued on the basis of the subparagraph (f) of paragraph (I) of Article 4 of the Law No.1211 on the Central Bank of the Republic of Turkey dated 14/01/1970.
ARTICLE 3 – (1) In this Communique;
“Bank” means the banks defined in Article 3 of the Banking Law No. 5411 dated 19/10/2005,
“Customer” means the real and legal persons having service from the banks,
c) “IBAN” means the International Bank Account Number generated according to the standard ISO 13616,
d) “ISO” means the International Organization for Standardization,
e) “TIC-RTGS system” means Turkish Interbank Clearing - Real Time Gross Settlement System.
Structure of the IBAN
ARTICLE 4 – (1) The IBAN to be assigned by the banks to the customers is made up of 26 alphanumeric characters that refers to a single account. The sequence of the characters from left to right is generated as shown in the Appendix 1 of this Communique in accordance with the following rules.
Number of Characters
Type of Characters
Alpha Characters (A-Z)
Numeric Characters (0-9)
IBAN check digits
Numeric Characters (0-9)
Numeric Characters (0-9)
Bank Account Number
(2) The IBAN, shall not contain the letters “İ,Ç,Ğ,Ö,Ş,Ü” and lower case letters,
(3) The country code of Turkey is “TR” according to ISO 3166,
(4) Bank codes are determined and announced by the Central Bank of the Republic of Turkey.
(5) There is no standard format for the bank account number. However, the 16 digits determined as the bank account number shall be right aligned and, if any, the blank spaces on its left shall be filled with zeros.
(6) The Reserved Field is zero for all IBAN.
(7) The calculation and validation of check digits shall be made by using the MOD 97-10 method developed according to the ISO 7064 as shown in the Appendix 2 and 3 of this Communique.
Generation of the IBAN
ARTICLE 5 – (1) Banks shall generate and communicate the IBAN for each bank account of the customer which is subject to money transfer, based on the principles of this Communique.
Representation of the IBAN
ARTICLE 6 – (1) Banks shall indicate the IBAN both on the statements of each accounts which are subject to written and electronic form of money transfer and all other statements that are required to include customer’s account number.
(2) In electronic form, the IBAN shall contain adjoining characters. There shall be no separators or blank spaces between characters.
(3) On written documents, the IBAN shall be shown in groups of 4 characters starting from left and separated by blank spaces.
Use and validation of the IBAN
ARTICLE 7 – (1) It is mandatory to validate and use beneficiary’s IBAN for the money transfers that are made to the accounts in the countries within the European Economic Area. However, this requirement shall not apply to the transactions conducted between and on behalf and account of banks and the institutions executing cross border payments, and to the transactions containing the customer’s written declaration indicating that the benefiaciary’s IBAN will not be notified though it is demanded.
(2) IBAN shall be validated for the incoming money transfers where the beneficiary’s account number is specified as IBAN.
(3) Banks shall use the sender’s IBAN for the money transfers made from the customer’s account.
(4) It is mandatory to validate and use the beneficiary’s IBAN for the money transfers made to the account through TIC-RTGS system, except for the transactions containing the customer’s written declaration indicating that the benefiaciary’s IBAN will not be notified though it is demanded.
ARTICLE 8 – (1) Banks may return or reject the transfer orders that are detected to have an invalid IBAN after the controls done according to the provisions of the seventh paragraph of Article 4 of this Communique.
ARTICLE 9 – (1) Article 6 and first paragraph of Article 7 of this Communique shall enter into force on 01/01/2009, second, third and fourth paragraphs of Article 7 and Article 8 shall enter into force on 01/01/2010, and the other articles shall enter into force on the date of publication.
ARTICLE 10 – (1) The provisions of this Communique shall be executed by the Governor of the Central Bank of the Republic of Turkey.
Appendix no. 1
TR xx yyyyy 0 zzzzzzzzzzzzzzzz
Bank Account Number is a 16-digit number which is composed of upper case letters and/or numbers.
Reserved Field is composed of a single digit number. 0 (zero) is used until it is changed.
Bank Code is a 5-digit number. The bank codes which do not have 5 digits are right aligned and zeros are written down before the code to complete it to 5 digits.
Check Digits are composed of 2-digit numbers.
Country Code is composed of 2-upper case letters. Country code is “TR” for Turkey.
Appendix no. 2
CALCULATION OF THE IBAN CHECK DIGITS
An artificial number is created starting with country code (ISO 3166) and “00”, and continuing with the bank account number that is to be converted to IBAN. There shall be no non alphanumeric characters and blank spaces in this number.
Example: The account number “0100000350930001” with the Ankara Branch of Central Bank of the Republic of Turkey (00001) becomes TR000000100100000350930001.
The first four characters are moved to the end of the IBAN:
Letters are converted into numeric characters in accordance with the “Conversion Table” as shown below.
The MOD 97-10 (ISO 7064) algorithm is applied.
The result is divided by 97 and the remainder (MOD 97-10) is subtracted from 98. If the result has one digit, then a zero will be inserted to the beginning.
98 - 51 = 47, then the IBAN becomes:
IBAN = TR470000100100000350930001.
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
Appendix no. 3
VALIDATION OF THE IBAN CHECK DIGITS
If there are any non alphanumeric characters and blank spaces in the IBAN, they are deleted.
Example: The IBAN, “TR47 0000 1001 0000 0350 9300 01”, becomes “TR470000100100000350930001” by removing all blank spaces.
The first four characters of the IBAN are moved to the right of the IBAN.
Letters in the IBAN are converted into numeric characters in accordance with the “Conversion Table” that is provided in Appendix 2.
Mod 97-10 (ISO 7064) method is applied to control the validity of the check digits.
In order for the check digits to be correct, the remainder (MOD 97-10) of dividing the result by 97 must be 1.
The remainder of dividing 0000100100000350930001292747 by 97 is 1.
In this way, the validity of the check digits within the IBAN is proven.
If the number that is subject to the mod calculation is too long for the relevant software (32-bit or 64-bit data represents 9 or 18 digit number), the mod calculation may be done by breaking the number into 9 or 18 digits.
- The remainder of 0000100100000350930001292747 divided by 97 is 1.
- The MOD 97-10 value of the first 9 (or 18) digits of the number is calculated.
- The MOD 97-10 of 000010010 is 19
- The remaining numbers are written down at the end of the result number in order to complete digit number to 9 (18) and then MOD 97-10 is calculated.
- The MOD 97-10 of 19000035093 is 43
- The previous step is repeated with the remaining numbers.
- The MOD 97-10 of 430001292747 is 1. (The same result is obtained.)