Austria IBAN Format, Length and Example

The numeric Austrian BBAN in two parts

• The value starts with AT, the IBAN country code for Austria.
• The next two characters are international check digits.
• The remaining 16 characters are the country-specific BBAN section: 16 digits after the country code and check digits.
• Austrian IBANs use a 20-character structure with a numeric BBAN in the example shown here.
• Because the value is mostly digits after AT, missing or transposed digits are the most common copy issue.

Moving from grouped AT text to compact input

For Austria, compare the grouped invoice-style value with the compact AT input produced after presentation spaces are removed.

Input shown on page

AT61 1904 3002 3457 3201

Normalized digital value

AT611904300234573201

Expected length

20 characters

Result interpretation

A passing AT result means the visible value matched supported Austria structure and MOD97 rules, not that the account or payee was verified.

Transposed digits in an all-numeric AT value

• Dropping a digit when moving from grouped print format to a compact form field.
• Treating a passed checksum as confirmation that the Austrian payee details are correct.

What the Austrian MOD97 result says

• Whether the IBAN starts with the AT country code.
• Whether the IBAN has 20 characters after normalization.
• Whether the value uses allowed letters and digits.
• Whether the MOD97-10 checksum is valid.

Fixed bank and account widths in Austria

Austria uses a 20-character IBAN. The Swift IBAN Registry describes the 16-digit Austrian BBAN as a five-digit bank identifier followed by an eleven-digit account number. The BBAN is numeric, so letters after the AT country code and international check digits are not expected in this national format. The bank identifier is already embedded in the IBAN and should stay in place when a print-formatted value is converted to the compact form used by payment software.

A practical Austrian review should remove spaces only and then confirm that the value still has all 20 characters. Leading zeroes in the account number are significant, even if a spreadsheet or document editor tries to hide them. Numeric strings also make transposed digits difficult to notice visually. Compare the original print groups with the compact value before running MOD97-10. A failed checksum identifies an inconsistency, but BankCodeKit cannot infer the intended digit or repair payment instructions on the user's behalf.

Do not merge an Austrian IBAN with the BIC, customer number, invoice identifier, or payment reference that may be printed nearby. The five-digit bank segment is structural data and is not queried against a live Austrian bank directory. BankCodeKit cannot establish account status, payee ownership, supported currency, or provider acceptance. If an invoice changes the beneficiary account, verify the new instruction through a known contact route before payment. Passing length and checksum rules is useful for data entry, but it is not an authorization or safety decision.

When the twenty-character Austrian length helps

• Checking Austrian invoice details before entering the compact AT value into a payment form.
• Explaining why spaces can be removed without changing the underlying IBAN.
• Use the IBAN Checker after this Austria reference when you need a local MOD97 result for one AT value.

Austria in the SEPA country reference

For Austria, the local SEPA country reference is: SEPA country - EU. This Austria country-level entry does not establish scheme support for a particular bank or account.

Questions about AT length and spacing

Last reviewed: 2026-07-17 Sources: Swift IBAN Registry, European Payments Council SEPA scheme countries list Reference data is reviewed periodically. BankCodeKit does not perform live bank, account, sanctions, or payment-network confirmation.