San Marino IBAN: format, length and checker
A San Marino IBAN starts with SM and has 27 characters. San Marino is part of SEPA.
Runs in your browser: nothing is sent to us. Checks length and the ISO 7064 mod-97 checksum.
Structure
| Country code | SM (2 letters) |
| Check digits | 2 digits (mod-97) |
| National account number (BBAN) | 23 characters |
| Total length | 27 |
| SEPA | yes |
Check IBANs automatically
The IBAN check API validates IBANs for invoicing, payout and onboarding flows (0.001 USDC per call), and names the bank for Dutch IBANs. Pair it with the company check and sanctions screening.
Questions
How many characters does a San Marino IBAN have?
27 characters: the country code SM, two check digits, and a 23-character national account number (BBAN).
Is San Marino in SEPA?
Yes, San Marino is in the Single Euro Payments Area, so euro transfers use SEPA credit transfers.
Does a valid checksum mean the account exists?
No. The mod-97 checksum catches typos; it does not confirm the account or its holder. In the Netherlands, your bank's name check (Verificatie van Betalingsontvanger) matches the holder.