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IBAN Structure Austria

Last reviewed: · Source: ISO 13616 / SWIFT IBAN Registry

Austria's IBAN has 20 characters in the format ATkk BBBB BCCC CCCC CCCC. It opens with the country code AT and two check digits, followed by a 5-digit bank code (Bankleitzahl) and an 11-digit account number. The IBAN is established in Austrian payments; exact requirements depend on the payment route and bank. The MOD-97 check digits (ISO 7064) guard against input errors and are derived from the remaining characters. For payments from EU/EEA banks to Austria, required routing details depend on the bank, currency and route; check them in advance with your bank.

Structural fields are based on the official SWIFT IBAN Registry. The editorial method and validation boundary are documented on our German editorial page (German).

Overview

CountryAustria (AT)
IBAN length20 characters
FormatATkk BBBB BCCC CCCC CCCC

Visual breakdown

Fictitious format example, not payment data:

AT611904300234573201
Country codeCheck digitsBank codeAccount number

Character-by-character explanation

SegmentCharactersLengthExplanation
Country codeAT2AT for Austria (ISO 3166-1)
Check digits612Two check digits per MOD-97
Bank code1904355-digit Austrian bank code (Bankleitzahl)
Account number002345732011111-digit account number

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Frequently asked questions

How do I check the length of an IBAN from Austria?
Remove spaces and count 20 characters. The first two characters are AT; the remaining positions follow ATkk BBBB BCCC CCCC CCCC. A different length is formally invalid for this country format.
What do the check digits in a Austria IBAN mean?
The two check digits are calculated from the complete IBAN using ISO 7064 MOD-97. They help detect format and transcription errors. A passing checksum does not confirm that an account exists or identify its account holder.
What should I do when an IBAN is formally invalid?
Check the country code, character count, letters and digits, and the check digits. Compare the entry with your bank records or ask the bank for the correct IBAN. This checker validates structure and checksum; it does not verify account ownership or payment approval.

IBAN structure for other countries

Germany

22 characters · DEkk BBBB BBBB CCCC CCCC CC

Switzerland

21 characters · CHkk BBBB BCCC CCCC CCCC C

Liechtenstein

21 characters · LIkk BBBB BCCC CCCC CCCC C

France

27 characters · FRkk BBBB BGGG GGCC CCCC CCCC CKK

Spain

24 characters · ESkk BBBB GGGG KKCC CCCC CCCC

Italy

27 characters · ITkk XBBB BBGG GGGC CCCC CCCC CCC

Portugal

25 characters · PTkk BBBB SSSS CCCC CCCC CCCK K

Netherlands

18 characters · NLkk BBBB CCCC CCCC CC