Monaco IBAN Format (MC) — Structure, Length & Example

The Monaco IBAN is 27 characters long and shares the same structural format as the French IBAN — both derived from the French RIB (Relevé d'Identité Bancaire) format. Monaco is a SEPA country and uses the euro as its official currency under a monetary agreement with the European Union. Monégasque bank accounts are processed through the French banking system, and the country participates fully in SEPA Credit Transfer and SEPA Direct Debit schemes.

Monaco IBAN at a Glance

• Country code: MC
• Total length: 27 characters (always)
• Format: MCkk bbbbb ggggg cccccccccc rr
• BBAN length: 23 characters
• Character types: Numeric bank code + numeric branch code + alphanumeric account + numeric RIB key
• SEPA member: Yes

Monaco IBAN Structure Explained

1. Country Code — MC (2 characters)

The ISO 3166-1 alpha-2 code for the Principality of Monaco. Every Monégasque IBAN begins with MC.

2. Check Digits — kk (2 digits)

Two decimal digits computed using the MOD-97 algorithm as defined in ISO 7064. These digits protect against common transcription and transposition errors.

3. Bank Code — bbbbb (5 digits)

A 5-digit numeric code identifying the bank. Because Monaco's banking system is integrated with France's, Monégasque bank codes follow the same numbering scheme as French bank codes. Notable institutions operating in Monaco:

• Société Générale Private Banking Monaco — One of the largest retail and private banking operations in the Principality.
• BNP Paribas Monaco — Full-service banking for residents, businesses, and private wealth clients.
• Credit Suisse (Monaco) — Private banking services for ultra-high-net-worth clients.
• Compagnie Monégasque de Banque (CMB) — The only bank headquartered and incorporated exclusively in Monaco.
• Barclays Bank Monaco — International private banking services.

4. Branch Code — ggggg (5 digits)

A 5-digit numeric code that identifies the specific branch (guichet in French). For many modern Monégasque accounts, especially private banking accounts, the branch code is set to a single central branch value.

5. Account Number — cccccccccc (11 characters, alphanumeric)

An 11-character account identifier that may contain both letters and digits. When letters are present, they are converted to their numeric equivalents using the French RIB conversion table (A,J→1; B,K,S→2; C,L,T→3; D,M,U→4; E,N,V→5; F,O,W→6; G,P,X→7; H,Q,Y→8; I,R,Z→9) before the check digit computation.

6. RIB Key — rr (2 digits)

A 2-digit domestic check key inherited from the French RIB format. It is computed using the same modulo-97 formula as French IBANs and is distinct from — but complementary to — the IBAN check digits.

Monaco IBAN Example Explained

MC58 1122 2000 0101 2345 6789 030

This is an example IBAN for illustrative purposes only. Do not use for real transfers.

• Country: MC (Monaco)
• Check digits: 58
• Bank code: 11222
• Branch code: 00001
• Account number: 01234567890
• RIB key: 30

Validate any Monégasque IBAN at the ibanchecker.cash IBAN validator, or see the full format specification at /iban-format/mc.

How Monaco IBAN Validation Works

1. Country code check: The first two characters must be MC.
2. Length check: The IBAN must be exactly 27 characters after removing spaces.
3. Character type check: The bank and branch codes (positions 5–14) must be decimal digits. The account number (positions 15–25) may include uppercase letters. Positions 26–27 (RIB key) must be decimal digits.
4. MOD-97 check: Move the first four characters to the end, convert any letters to their numeric values (A=10 … Z=35), and divide by 97. A valid IBAN yields a remainder of 1.

Monaco Is a SEPA Country

Monaco is a SEPA member through its monetary agreement with the EU. Practical implications:

• SEPA Credit Transfers to Monégasque IBANs settle within one business day, just like intra-EU transfers.
• SEPA Direct Debit mandates are fully supported.
• The IBAN alone is sufficient for SEPA payments; no additional BIC code is required.
• Monaco uses the euro but is not an EU member state — it has a monetary agreement with the EU that grants it euro-area status.

Look up any Monégasque bank's BIC using the ibanchecker.cash SWIFT directory.

Monaco vs. France: IBAN Similarities and Differences

Monaco and France share the same 27-character IBAN structure because both are built on the French RIB format. The key difference is the country code:

• French IBANs: FR + 2 check digits + 23-character BBAN
• Monégasque IBANs: MC + 2 check digits + 23-character BBAN

A French IBAN will not route to a Monaco bank account, even if the bank codes are numerically similar. Always verify the country code before sending a payment.

Common Monaco IBAN Mistakes

Using a French IBAN Instead of MC

Given Monaco's close integration with the French banking system, it is a frequent mistake to record a Monégasque account with country code FR. Always check that the country code is MC, not FR.

Wrong Length — 26 or 28 Characters

Monaco IBANs are always 27 characters. A 27-character French IBAN and a 27-character Monégasque IBAN are both valid IBAN lengths — distinguish them by the country code, not the length.

Omitting the RIB Key in Manual Entry

Accountants copying a Monaco RIB into a payment form occasionally omit the 2-digit Clé RIB, producing a 25-character string. This is invalid — the RIB key is part of the BBAN and must be included.

Validating Monaco IBANs in Bulk

Finance teams processing payments to Monégasque counterparties can use the ibanchecker.cash bulk checker to validate batches of IBANs alongside French, Italian, and other European account numbers in a single upload.

Last updated: June 2026